This manual is for GNU libunistring. GNU libunistring 1 Introduction 1.1 Unicode 1.2 Unicode and Internationalization 1.3 Locale encodings 1.4 Choice of in-memory representation of strings 1.5 ‘char *’ strings 1.6 Unicode strings 2 Conventions 3 Elementary types ‘’ 4 Elementary Unicode string functions ‘’ 4.1 Elementary string checks 4.2 Elementary string conversions 4.3 Elementary string functions 4.3.1 Iterating over a Unicode string 4.3.2 Creating Unicode strings one character at a time 4.3.3 Copying Unicode strings 4.3.4 Comparing Unicode strings 4.3.5 Searching for a character in a Unicode string 4.3.6 Counting the characters in a Unicode string 4.4 Elementary string functions with memory allocation 4.5 Elementary string functions on NUL terminated strings 4.5.1 Iterating over a NUL terminated Unicode string 4.5.2 Length of a NUL terminated Unicode string 4.5.3 Copying a NUL terminated Unicode string 4.5.4 Comparing NUL terminated Unicode strings 4.5.5 Duplicating a NUL terminated Unicode string 4.5.6 Searching for a character in a NUL terminated Unicode string 4.5.7 Searching for a substring in a NUL terminated Unicode string 4.5.8 Tokenizing a NUL terminated Unicode string 5 Conversions between Unicode and encodings ‘’ 6 Output with Unicode strings ‘’ 7 Names of Unicode characters ‘’ 8 Unicode character classification and properties ‘’ 8.1 General category 8.1.1 The object oriented API for general category 8.1.2 The bit mask API for general category 8.2 Canonical combining class 8.3 Bidi class 8.4 Decimal digit value 8.5 Digit value 8.6 Numeric value 8.7 Mirrored character 8.8 Arabic shaping 8.8.1 Joining type of Arabic characters 8.8.2 Joining group of Arabic characters 8.9 Properties 8.9.1 Properties as objects – the object oriented API 8.9.2 Properties as functions – the functional API 8.10 Other attributes 8.10.1 Indic conjunct break 8.11 Scripts 8.12 Blocks 8.13 ISO C and Java syntax 8.14 Classifications like in ISO C 9 Display width ‘’ 10 Grapheme cluster breaks in strings ‘’ 10.1 Grapheme cluster breaks in a string 10.2 Grapheme cluster break property 11 Word breaks in strings ‘’ 11.1 Word breaks in a string 11.2 Word break property 12 Line breaking ‘’ 13 Normalization forms (composition and decomposition) ‘’ 13.1 Decomposition of Unicode characters 13.2 Composition of Unicode characters 13.3 Normalization of strings 13.4 Normalizing comparisons 13.5 Normalization of streams of Unicode characters 14 Case mappings ‘’ 14.1 Case mappings of characters 14.2 Case mappings of strings 14.3 Case mappings of substrings 14.4 Case insensitive comparison 14.5 Case detection 15 Regular expressions ‘’ 16 Using the library 16.1 Installation 16.2 Compiler options 16.3 Include files 16.4 Autoconf macro 16.5 Reporting problems 17 More advanced functionality Appendix A The ‘wchar_t’ mess Appendix B The ‘char32_t’ problem Appendix C Licenses C.1 GNU GENERAL PUBLIC LICENSE C.2 GNU LESSER GENERAL PUBLIC LICENSE C.3 GNU Free Documentation License Index GNU libunistring **************** 1 Introduction ************** This library provides functions for manipulating Unicode strings and for manipulating C strings according to the Unicode standard. It consists of the following parts: ‘’ elementary string functions ‘’ conversion from/to legacy encodings ‘’ formatted output to strings ‘’ character names ‘’ character classification and properties ‘’ string width when using nonproportional fonts ‘’ grapheme cluster breaks ‘’ word breaks ‘’ line breaking algorithm ‘’ normalization (composition and decomposition) ‘’ case folding ‘’ regular expressions (not yet implemented) libunistring is for you if your application involves non-trivial text processing, such as upper/lower case conversions, line breaking, operations on words, or more advanced analysis of text. Text provided by the user can, in general, contain characters of all kinds of scripts. The text processing functions provided by this library handle all scripts and all languages. libunistring is for you if your application already uses the ISO C / POSIX ‘’, ‘’ functions and the text it operates on is provided by the user and can be in any language. libunistring is also for you if your application uses Unicode strings as internal in-memory representation. 1.1 Unicode =========== Unicode is a standardized repertoire of characters that contains characters from all scripts of the world, from Latin letters to Chinese ideographs and Babylonian cuneiform glyphs. It also specifies how these characters are to be rendered on a screen or on paper, and how common text processing (word selection, line breaking, uppercasing of page titles etc.) is supposed to behave on Unicode text. Unicode also specifies three ways of storing sequences of Unicode characters in a computer whose basic unit of data is an 8-bit byte: UTF-8 Every character is represented as 1 to 4 bytes. UTF-16 Every character is represented as 1 to 2 units of 16 bits. UTF-32, a.k.a. UCS-4 Every character is represented as 1 unit of 32 bits. For encoding Unicode text in a file, UTF-8 is usually used. For encoding Unicode strings in memory for a program, either of the three encoding forms can be reasonably used. Unicode is widely used on the web. Prior to the use of Unicode, web pages were in many different encodings (ISO-8859-1 for English, French, Spanish, ISO-8859-2 for Polish, ISO-8859-7 for Greek, KOI8-R for Russian, GB2312 or BIG5 for Chinese, ISO-2022-JP-2 or EUC-JP or Shift_JIS for Japanese, and many many others). It was next to impossible to create a document that contained Chinese and Polish text in the same document. Due to the many encodings for Japanese, even the processing of pure Japanese text was error prone. References: • The Unicode standard: • Definition of UTF-8: • Definition of UTF-16: • Markus Kuhn’s UTF-8 and Unicode FAQ: 1.2 Unicode and Internationalization ==================================== Internationalization is the process of changing the source code of a program so that it can meet the expectations of users in any culture, if culture specific data (translations, images etc.) are provided. Use of Unicode is not strictly required for internationalization, but it makes internationalization much easier, because operations that need to look at specific characters (like hyphenation, spell checking, or the automatic conversion of double-quotes to opening and closing double-quote characters) don’t need to consider multiple possible encodings of the text. Use of Unicode also enables multilingualization: the ability of having text in multiple languages present in the same document or even in the same line of text. But use of Unicode is not everything. Internationalization usually consists of four features: • Use of Unicode where needed for text processing. This is what this library is for. • Use of message catalogs for messages shown to the user, This is what GNU gettext is about. • Use of locale specific conventions for date and time formats, for numeric formatting, or for sorting of text. This can be done adequately with the POSIX APIs and the implementation of locales in the GNU C library. • In graphical user interfaces, adapting the GUI to the default text direction of the current locale (see right-to-left languages (https://en.wikipedia.org/wiki/Right-to-left)). 1.3 Locale encodings ==================== A locale is a set of cultural conventions. According to POSIX, for a program, at any moment, there is one locale being designated as the “current locale”. (Actually, POSIX supports also one locale per thread, but this feature is not yet universally implemented and not widely used.) The locale is partitioned into several aspects, called the “categories” of the locale. The main various aspects are: • The character encoding and the character properties. This is the ‘LC_CTYPE’ category. • The sorting rules for text. This is the ‘LC_COLLATE’ category. • The language specific translations of messages. This is the ‘LC_MESSAGES’ category. • The formatting rules for numbers, such as the decimal separator. This is the ‘LC_NUMERIC’ category. • The formatting rules for amounts of money. This is the ‘LC_MONETARY’ category. • The formatting of date and time. This is the ‘LC_TIME’ category. In particular, the ‘LC_CTYPE’ category of the current locale determines the character encoding. This is the encoding of ‘char *’ strings. We also call it the “locale encoding”. GNU libunistring has a function, ‘locale_charset’, that returns a standardized (platform independent) name for this encoding. All locale encodings used on glibc systems are essentially ASCII compatible: Most graphic ASCII characters have the same representation, as a single byte, in that encoding as in ASCII. Among the possible locale encodings are UTF-8 and GB18030. Both allow to represent any Unicode character as a sequence of bytes. UTF-8 is used in most of the world, whereas GB18030 is used in the People’s Republic of China, because it is backward compatible with the GB2312 encoding that was used in this country earlier. The legacy locale encodings, ISO-8859-15 (which supplanted ISO-8859-1 in most of Europe), ISO-8859-2, KOI8-R, EUC-JP, etc., are still in use in some places, though. UTF-16 and UTF-32 are not used as locale encodings, because they are not ASCII compatible. 1.4 Choice of in-memory representation of strings ================================================= There are three ways of representing strings in memory of a running program. • As ‘char *’ strings. Such strings are represented in locale encoding. This approach is employed when not much text processing is done by the program. When some Unicode aware processing is to be done, a string is converted to Unicode on the fly and back to locale encoding afterwards. • As UTF-8 or UTF-16 or UTF-32 strings. This implies that conversion from locale encoding to Unicode is performed on input, and in the opposite direction on output. This approach is employed when the program does a significant amount of text processing, or when the program has multiple threads operating on the same data but in different locales. • As ‘wchar_t *’, a.k.a. “wide strings”. This approach is misguided, see *note The wchar_t mess::. Of course, a ‘char *’ string can, in some cases, be encoded in UTF-8. You will use the data type depending on what you can guarantee about how it’s encoded: If a string is encoded in the locale encoding, or if you don’t know how it’s encoded, use ‘char *’. If, on the other hand, you can _guarantee_ that it is UTF-8 encoded, then you can use the UTF-8 string type, ‘uint8_t *’, for it. The five types ‘char *’, ‘uint8_t *’, ‘uint16_t *’, ‘uint32_t *’, and ‘wchar_t *’ are incompatible types at the C level. Therefore, ‘gcc -Wall’ will produce a warning if, by mistake, your code contains a mismatch between these types. In the context of using GNU libunistring, even a warning about a mismatch between ‘char *’ and ‘uint8_t *’ is a sign of a bug in your code that you should not try to silence through a cast. 1.5 ‘char *’ strings ==================== The classical C strings, with its C library support standardized by ISO C and POSIX, can be used in internationalized programs with some precautions. The problem with this API is that many of the C library functions for strings don’t work correctly on strings in locale encodings, leading to bugs that only people in some cultures of the world will experience. The first problem with the C library API is the support of multibyte locales. According to the locale encoding, in general, every character is represented by one or more bytes (up to 4 bytes in practice — but use ‘MB_LEN_MAX’ instead of the number 4 in the code). When every character is represented by only 1 byte, we speak of an “unibyte locale”, otherwise of a “multibyte locale”. It is important to realize that the majority of Unix installations nowadays use UTF-8 or GB18030 as locale encoding; therefore, the majority of users are using multibyte locales. The important fact to remember is: _A ‘char’ is a byte, not a character._ As a consequence: • The ‘’ API is useless in this context; it does not work in multibyte locales. • The ‘strlen’ function does not return the number of characters in a string. Nor does it return the number of screen columns occupied by a string after it is output. It merely returns the number of _bytes_ occupied by a string. • Truncating a string, for example, with ‘strncpy’, can have the effect of truncating it in the middle of a multibyte character. Such a string will, when output, have a garbled character at its end, often represented by a hollow box. • ‘strchr’ and ‘strrchr’ do not work with multibyte strings if the locale encoding is GB18030 and the character to be searched is a digit. • ‘strstr’ does not work with multibyte strings if the locale encoding is different from UTF-8. • ‘strcspn’, ‘strpbrk’, ‘strspn’ cannot work correctly in multibyte locales: they assume the second argument is a list of single-byte characters. Even in this simple case, they do not work with multibyte strings if the locale encoding is GB18030 and one of the characters to be searched is a digit. • ‘strsep’ and ‘strtok_r’ do not work with multibyte strings unless all of the delimiter characters are ASCII characters < 0x30. • The ‘strcasecmp’, ‘strncasecmp’, and ‘strcasestr’ functions do not work with multibyte strings. The workarounds can be found in GNU gnulib . • gnulib has modules ‘mbchar’, ‘mbiter’, ‘mbuiter’ that represent multibyte characters and allow to iterate across a multibyte string with the same ease as through a unibyte string. • gnulib has functions ‘mbslen’ and ‘mbswidth’ that can be used instead of ‘strlen’ when the number of characters or the number of screen columns of a string is requested. • gnulib has functions ‘mbschr’ and ‘mbsrrchr’ that are like ‘strchr’ and ‘strrchr’, but work in multibyte locales. • gnulib has a function ‘mbsstr’ that is like ‘strstr’, but works in multibyte locales. • gnulib has functions ‘mbscspn’, ‘mbspbrk’, ‘mbsspn’ that are like ‘strcspn’, ‘strpbrk’, ‘strspn’, but work in multibyte locales. • gnulib has functions ‘mbssep’ and ‘mbstok_r’ that are like ‘strsep’ and ‘strtok_r’ but work in multibyte locales. • gnulib has functions ‘mbscasecmp’, ‘mbsncasecmp’, ‘mbspcasecmp’, and ‘mbscasestr’ that are like ‘strcasecmp’, ‘strncasecmp’, and ‘strcasestr’, but work in multibyte locales. Still, the function ‘ulc_casecmp’ is preferable to these functions; see below. The second problem with the C library API is that it has some assumptions built-in that are not valid in some languages: • It assumes that there are only two forms of every character: uppercase and lowercase. This is not true for Croatian, where the character LETTER DZ WITH CARON comes in three forms: LATIN CAPITAL LETTER DZ WITH CARON (DZ), LATIN CAPITAL LETTER D WITH SMALL LETTER Z WITH CARON (Dz), LATIN SMALL LETTER DZ WITH CARON (dz). • It assumes that uppercasing of 1 character leads to 1 character. This is not true for German, where the LATIN SMALL LETTER SHARP S, when uppercased, becomes ‘SS’. • It assumes that there is 1:1 mapping between uppercase and lowercase forms. This is not true for the Greek sigma: GREEK CAPITAL LETTER SIGMA is the uppercase of both GREEK SMALL LETTER SIGMA and GREEK SMALL LETTER FINAL SIGMA. • It assumes that the upper/lowercase mappings are position independent. This is not true for the Greek sigma and the Lithuanian i. The correct way to deal with this problem is 1. to provide functions for titlecasing, as well as for upper- and lowercasing, 2. to view case transformations as functions that operates on strings, rather than on characters. This is implemented in this library, through the functions declared in ‘’, see *note unicase.h::. 1.6 Unicode strings =================== libunistring supports Unicode strings in three representations: • UTF-8 strings, through the type ‘uint8_t *’. The units are bytes (‘uint8_t’). • UTF-16 strings, through the type ‘uint16_t *’, The units are 16-bit memory words (‘uint16_t’). • UTF-32 strings, through the type ‘uint32_t *’. The units are 32-bit memory words (‘uint32_t’). As with C strings, there are two variants: • Unicode strings with a terminating NUL character are represented as a pointer to the first unit of the string. There is a unit containing a 0 value at the end. It is considered part of the string for all memory allocation purposes, but is not considered part of the string for all other logical purposes. • Unicode strings where embedded NUL characters are allowed. These are represented by a pointer to the first unit and the number of units (not bytes!) of the string. In this setting, there is no trailing zero-valued unit used as “end marker”. 2 Conventions ************* This chapter explains conventions valid throughout the libunistring library. Variables of type ‘char *’ denote C strings in locale encoding. See *note Locale encodings::. Variables of type ‘uint8_t *’ denote UTF-8 strings. Their units are bytes. Variables of type ‘uint16_t *’ denote UTF-16 strings, without byte order mark. Their units are 2-byte words. Variables of type ‘uint32_t *’ denote UTF-32 strings, without byte order mark. Their units are 4-byte words. Argument pairs ‘(S, N)’ denote a string ‘S[0..N-1]’ with exactly N units.(1) All functions with prefix ‘ulc_’ operate on C strings in locale encoding. All functions with prefix ‘u8_’ operate on UTF-8 strings. All functions with prefix ‘u16_’ operate on UTF-16 strings. All functions with prefix ‘u32_’ operate on UTF-32 strings. For every function with prefix ‘u8_’, operating on UTF-8 strings, there is also a corresponding function with prefix ‘u16_’, operating on UTF-16 strings, and a corresponding function with prefix ‘u32_’, operating on UTF-32 strings. Their description is analogous; in this documentation we describe only the function that operates on UTF-8 strings, for brevity. A declaration with a variable N denotes the three concrete declarations with N = 8, N = 16, N = 32. All parameters starting with ‘str’ and the parameters of functions starting with ‘u8_str’/‘u16_str’/‘u32_str’ denote a NUL terminated string. Error values are always returned through the ‘errno’ variable, usually with a return value that indicates the presence of an error (NULL for functions that return an pointer, or -1 for functions that return an ‘int’). Functions returning a string result take a ‘(RESULTBUF, LENGTHP)’ argument pair. If RESULTBUF is not NULL and the result fits into ‘*LENGTHP’ units, it is put in RESULTBUF, and RESULTBUF is returned. Otherwise, a freshly allocated string is returned. In both cases, ‘*LENGTHP’ is set to the length (number of units) of the returned string. In case of error, NULL is returned and ‘errno’ is set. To invoke such a function: • First ask yourself whether you want to accept the overhead of a ‘malloc’ invocation even for a small-sized result. If yes, pass NULL as RESULTBUF. If no, allocate an array of units on the stack, typically between 50 and 4000 bytes large; pass this array as RESULTBUF; and initialize ‘*LENGTHP’ to the number of units of this array. • Upon return from such a function, look at the return value: NULL means an error; look at the value of ‘errno’ in this case. Otherwise, the return value is the result, with ‘*LENGTHP’ units. Note that the function has _not_ added an extra NUL character at the end. • Finally, do memory management. You know that the result was ‘malloc’-allocated if it is ‘!= NULL’ and ‘!= RESULTBUF’. ---------- Footnotes ---------- (1) A NUL unit as terminator is not needed, since the number of units is given by N. If some of the units of the string are NUL, they are just regular units; they are not interpreted as terminators. 3 Elementary types ‘’ ********************************* The include file ‘’ provides the following basic types. -- Type: uint8_t -- Type: uint16_t -- Type: uint32_t These are the storage units of UTF-8/16/32 strings, respectively. The definitions are taken from ‘’, on platforms where this include file is present. -- Type: ucs4_t This type represents a single Unicode character, outside of an UTF-32 string. The types ‘ucs4_t’ and ‘uint32_t’ happen to be identical. They differ in use and intent, however: • Use ‘uint32_t *’ to designate an UTF-32 string. Use ‘ucs4_t’ to designate a single Unicode character, outside of an UTF-32 string. • Conversions functions that take an UTF-32 string as input will usually perform a range-check on the ‘uint32_t’ values. Whereas functions that are declared to take ‘ucs4_t’ arguments will not perform such a range-check. 4 Elementary Unicode string functions ‘’ ************************************************** This include file declares elementary functions for Unicode strings. It is essentially the equivalent of what ‘’ is for C strings. 4.1 Elementary string checks ============================ The following function is available to verify the integrity of a Unicode string. -- Function: const uint8_t * u8_check (const uint8_t *S, size_t N) -- Function: const uint16_t * u16_check (const uint16_t *S, size_t N) -- Function: const uint32_t * u32_check (const uint32_t *S, size_t N) This function checks whether a Unicode string is well-formed. It returns NULL if valid, or a pointer to the first invalid unit otherwise. 4.2 Elementary string conversions ================================= The following functions perform conversions between the different forms of Unicode strings. -- Function: uint16_t * u8_to_u16 (const uint8_t *S, size_t N, uint16_t *RESULTBUF, size_t *LENGTHP) Converts an UTF-8 string to an UTF-16 string. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. -- Function: uint32_t * u8_to_u32 (const uint8_t *S, size_t N, uint32_t *RESULTBUF, size_t *LENGTHP) Converts an UTF-8 string to an UTF-32 string. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. -- Function: uint8_t * u16_to_u8 (const uint16_t *S, size_t N, uint8_t *RESULTBUF, size_t *LENGTHP) Converts an UTF-16 string to an UTF-8 string. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. -- Function: uint32_t * u16_to_u32 (const uint16_t *S, size_t N, uint32_t *RESULTBUF, size_t *LENGTHP) Converts an UTF-16 string to an UTF-32 string. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. -- Function: uint8_t * u32_to_u8 (const uint32_t *S, size_t N, uint8_t *RESULTBUF, size_t *LENGTHP) Converts an UTF-32 string to an UTF-8 string. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. -- Function: uint16_t * u32_to_u16 (const uint32_t *S, size_t N, uint16_t *RESULTBUF, size_t *LENGTHP) Converts an UTF-32 string to an UTF-16 string. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. 4.3 Elementary string functions =============================== 4.3.1 Iterating over a Unicode string ------------------------------------- The following functions inspect and return details about the first character in a Unicode string. -- Function: int u8_mblen (const uint8_t *S, size_t N) -- Function: int u16_mblen (const uint16_t *S, size_t N) -- Function: int u32_mblen (const uint32_t *S, size_t N) Returns the length (number of units) of the first character in S, which is no longer than N. Returns 0 if it is the NUL character. Returns -1 upon failure. This function is similar to ‘mblen’, except that it operates on a Unicode string and that S must not be NULL. -- Function: int u8_mbtouc (ucs4_t *PUC, const uint8_t *S, size_t N) -- Function: int u16_mbtouc (ucs4_t *PUC, const uint16_t *S, size_t N) -- Function: int u32_mbtouc (ucs4_t *PUC, const uint32_t *S, size_t N) Returns the length (number of units) of the first character in S, putting its ‘ucs4_t’ representation in ‘*PUC’. Upon failure, ‘*PUC’ is set to ‘0xfffd’, and an appropriate number of units is returned. The number of available units, N, must be > 0. This function fails if an invalid sequence of units is encountered at the beginning of S, or if additional units (after the N provided units) would be needed to form a character. This function is similar to ‘mbtowc’, except that it operates on a Unicode string, PUC and S must not be NULL, N must be > 0, and the NUL character is not treated specially. -- Function: int u8_mbtouc_unsafe (ucs4_t *PUC, const uint8_t *S, size_t N) -- Function: int u16_mbtouc_unsafe (ucs4_t *PUC, const uint16_t *S, size_t N) -- Function: int u32_mbtouc_unsafe (ucs4_t *PUC, const uint32_t *S, size_t N) This function is identical to ‘u8_mbtouc’/‘u16_mbtouc’/‘u32_mbtouc’. Earlier versions of this function performed fewer range-checks on the sequence of units. -- Function: int u8_mbtoucr (ucs4_t *PUC, const uint8_t *S, size_t N) -- Function: int u16_mbtoucr (ucs4_t *PUC, const uint16_t *S, size_t N) -- Function: int u32_mbtoucr (ucs4_t *PUC, const uint32_t *S, size_t N) Returns the length (number of units) of the first character in S, putting its ‘ucs4_t’ representation in ‘*PUC’. Upon failure, ‘*PUC’ is set to ‘0xfffd’, and -1 is returned for an invalid sequence of units, -2 is returned for an incomplete sequence of units. The number of available units, N, must be > 0. This function is similar to ‘u8_mbtouc’, except that the return value gives more details about the failure, similar to ‘mbrtowc’. 4.3.2 Creating Unicode strings one character at a time ------------------------------------------------------ The following function stores a Unicode character as a Unicode string in memory. -- Function: int u8_uctomb (uint8_t *S, ucs4_t UC, ptrdiff_t N) -- Function: int u16_uctomb (uint16_t *S, ucs4_t UC, ptrdiff_t N) -- Function: int u32_uctomb (uint32_t *S, ucs4_t UC, ptrdiff_t N) Puts the multibyte character represented by UC in S, returning its length. Returns -1 upon failure, -2 if the number of available units, N, is too small. The latter case cannot occur if N >= 6/2/1, respectively. This function is similar to ‘wctomb’, except that it operates on a Unicode strings, S must not be NULL, and the argument N must be specified. 4.3.3 Copying Unicode strings ----------------------------- The following functions copy Unicode strings in memory. -- Function: uint8_t * u8_cpy (uint8_t *DEST, const uint8_t *SRC, size_t N) -- Function: uint16_t * u16_cpy (uint16_t *DEST, const uint16_t *SRC, size_t N) -- Function: uint32_t * u32_cpy (uint32_t *DEST, const uint32_t *SRC, size_t N) Copies N units from SRC to DEST. This function is similar to ‘memcpy’, except that it operates on Unicode strings. -- Function: uint8_t * u8_pcpy (uint8_t *DEST, const uint8_t *SRC, size_t N) -- Function: uint16_t * u16_pcpy (uint16_t *DEST, const uint16_t *SRC, size_t N) -- Function: uint32_t * u32_pcpy (uint32_t *DEST, const uint32_t *SRC, size_t N) Copies N units from SRC to DEST, returning a pointer after the last written unit. This function is similar to ‘mempcpy’, except that it operates on Unicode strings. -- Function: uint8_t * u8_move (uint8_t *DEST, const uint8_t *SRC, size_t N) -- Function: uint16_t * u16_move (uint16_t *DEST, const uint16_t *SRC, size_t N) -- Function: uint32_t * u32_move (uint32_t *DEST, const uint32_t *SRC, size_t N) Copies N units from SRC to DEST, guaranteeing correct behavior for overlapping memory areas. This function is similar to ‘memmove’, except that it operates on Unicode strings. The following function fills a Unicode string. -- Function: uint8_t * u8_set (uint8_t *S, ucs4_t UC, size_t N) -- Function: uint16_t * u16_set (uint16_t *S, ucs4_t UC, size_t N) -- Function: uint32_t * u32_set (uint32_t *S, ucs4_t UC, size_t N) Sets the first N characters of S to UC. UC should be a character that occupies only 1 unit. This function is similar to ‘memset’, except that it operates on Unicode strings. 4.3.4 Comparing Unicode strings ------------------------------- The following function compares two Unicode strings of the same length. -- Function: int u8_cmp (const uint8_t *S1, const uint8_t *S2, size_t N) -- Function: int u16_cmp (const uint16_t *S1, const uint16_t *S2, size_t N) -- Function: int u32_cmp (const uint32_t *S1, const uint32_t *S2, size_t N) Compares S1 and S2, each of length N, lexicographically. Returns a negative value if S1 compares smaller than S2, a positive value if S1 compares larger than S2, or 0 if they compare equal. This function is similar to ‘memcmp’, except that it operates on Unicode strings. The following function compares two Unicode strings of possibly different lengths. -- Function: int u8_cmp2 (const uint8_t *S1, size_t N1, const uint8_t *S2, size_t N2) -- Function: int u16_cmp2 (const uint16_t *S1, size_t N1, const uint16_t *S2, size_t N2) -- Function: int u32_cmp2 (const uint32_t *S1, size_t N1, const uint32_t *S2, size_t N2) Compares S1 and S2, lexicographically. Returns a negative value if S1 compares smaller than S2, a positive value if S1 compares larger than S2, or 0 if they compare equal. This function is similar to the gnulib function ‘memcmp2’, except that it operates on Unicode strings. 4.3.5 Searching for a character in a Unicode string --------------------------------------------------- The following function searches for a given Unicode character. -- Function: uint8_t * u8_chr (const uint8_t *S, size_t N, ucs4_t UC) -- Function: uint16_t * u16_chr (const uint16_t *S, size_t N, ucs4_t UC) -- Function: uint32_t * u32_chr (const uint32_t *S, size_t N, ucs4_t UC) Searches the string at S for UC. Returns a pointer to the first occurrence of UC in S, or NULL if UC does not occur in S. This function is similar to ‘memchr’, except that it operates on Unicode strings. 4.3.6 Counting the characters in a Unicode string ------------------------------------------------- The following function counts the number of Unicode characters. -- Function: size_t u8_mbsnlen (const uint8_t *S, size_t N) -- Function: size_t u16_mbsnlen (const uint16_t *S, size_t N) -- Function: size_t u32_mbsnlen (const uint32_t *S, size_t N) Counts and returns the number of Unicode characters in the N units from S. This function is similar to the gnulib function ‘mbsnlen’, except that it operates on Unicode strings. 4.4 Elementary string functions with memory allocation ====================================================== The following function copies a Unicode string. -- Function: uint8_t * u8_cpy_alloc (const uint8_t *S, size_t N) -- Function: uint16_t * u16_cpy_alloc (const uint16_t *S, size_t N) -- Function: uint32_t * u32_cpy_alloc (const uint32_t *S, size_t N) Makes a freshly allocated copy of S, of length N. 4.5 Elementary string functions on NUL terminated strings ========================================================= 4.5.1 Iterating over a NUL terminated Unicode string ---------------------------------------------------- The following functions inspect and return details about the first character in a Unicode string. -- Function: int u8_strmblen (const uint8_t *S) -- Function: int u16_strmblen (const uint16_t *S) -- Function: int u32_strmblen (const uint32_t *S) Returns the length (number of units) of the first character in S. Returns 0 if it is the NUL character. Returns -1 upon failure. -- Function: int u8_strmbtouc (ucs4_t *PUC, const uint8_t *S) -- Function: int u16_strmbtouc (ucs4_t *PUC, const uint16_t *S) -- Function: int u32_strmbtouc (ucs4_t *PUC, const uint32_t *S) Returns the length (number of units) of the first character in S, putting its ‘ucs4_t’ representation in ‘*PUC’. Returns 0 if it is the NUL character. Returns -1 upon failure. -- Function: const uint8_t * u8_next (ucs4_t *PUC, const uint8_t *S) -- Function: const uint16_t * u16_next (ucs4_t *PUC, const uint16_t *S) -- Function: const uint32_t * u32_next (ucs4_t *PUC, const uint32_t *S) Forward iteration step. Advances the pointer past the next character, or returns NULL if the end of the string has been reached. Puts the character’s ‘ucs4_t’ representation in ‘*PUC’. The following function inspects and returns details about the previous character in a Unicode string. -- Function: const uint8_t * u8_prev (ucs4_t *PUC, const uint8_t *S, const uint8_t *START) -- Function: const uint16_t * u16_prev (ucs4_t *PUC, const uint16_t *S, const uint16_t *START) -- Function: const uint32_t * u32_prev (ucs4_t *PUC, const uint32_t *S, const uint32_t *START) Backward iteration step. Advances the pointer to point to the previous character (the one that ends at ‘S’), or returns NULL if the beginning of the string (specified by ‘START’) had been reached. Puts the character’s ‘ucs4_t’ representation in ‘*PUC’. Note that this function works only on well-formed Unicode strings. 4.5.2 Length of a NUL terminated Unicode string ----------------------------------------------- The following functions determine the length of a Unicode string. -- Function: size_t u8_strlen (const uint8_t *S) -- Function: size_t u16_strlen (const uint16_t *S) -- Function: size_t u32_strlen (const uint32_t *S) Returns the number of units in S. This function is similar to ‘strlen’ and ‘wcslen’, except that it operates on Unicode strings. -- Function: size_t u8_strnlen (const uint8_t *S, size_t MAXLEN) -- Function: size_t u16_strnlen (const uint16_t *S, size_t MAXLEN) -- Function: size_t u32_strnlen (const uint32_t *S, size_t MAXLEN) Returns the number of units in S, but at most MAXLEN. This function is similar to ‘strnlen’ and ‘wcsnlen’, except that it operates on Unicode strings. 4.5.3 Copying a NUL terminated Unicode string --------------------------------------------- The following functions copy portions of Unicode strings in memory. -- Function: uint8_t * u8_strcpy (uint8_t *DEST, const uint8_t *SRC) -- Function: uint16_t * u16_strcpy (uint16_t *DEST, const uint16_t *SRC) -- Function: uint32_t * u32_strcpy (uint32_t *DEST, const uint32_t *SRC) Copies SRC to DEST. This function is similar to ‘strcpy’ and ‘wcscpy’, except that it operates on Unicode strings. -- Function: uint8_t * u8_stpcpy (uint8_t *DEST, const uint8_t *SRC) -- Function: uint16_t * u16_stpcpy (uint16_t *DEST, const uint16_t *SRC) -- Function: uint32_t * u32_stpcpy (uint32_t *DEST, const uint32_t *SRC) Copies SRC to DEST, returning the address of the terminating NUL in DEST. This function is similar to ‘stpcpy’, except that it operates on Unicode strings. -- Function: uint8_t * u8_strncpy (uint8_t *DEST, const uint8_t *SRC, size_t N) -- Function: uint16_t * u16_strncpy (uint16_t *DEST, const uint16_t *SRC, size_t N) -- Function: uint32_t * u32_strncpy (uint32_t *DEST, const uint32_t *SRC, size_t N) Copies no more than N units of SRC to DEST. This function is similar to ‘strncpy’ and ‘wcsncpy’, except that it operates on Unicode strings. -- Function: uint8_t * u8_stpncpy (uint8_t *DEST, const uint8_t *SRC, size_t N) -- Function: uint16_t * u16_stpncpy (uint16_t *DEST, const uint16_t *SRC, size_t N) -- Function: uint32_t * u32_stpncpy (uint32_t *DEST, const uint32_t *SRC, size_t N) Copies no more than N units of SRC to DEST. Returns a pointer past the last non-NUL unit written into DEST. In other words, if the units written into DEST include a NUL, the return value is the address of the first such NUL unit, otherwise it is ‘DEST + N’. This function is similar to ‘stpncpy’, except that it operates on Unicode strings. -- Function: uint8_t * u8_strcat (uint8_t *DEST, const uint8_t *SRC) -- Function: uint16_t * u16_strcat (uint16_t *DEST, const uint16_t *SRC) -- Function: uint32_t * u32_strcat (uint32_t *DEST, const uint32_t *SRC) Appends SRC onto DEST. This function is similar to ‘strcat’ and ‘wcscat’, except that it operates on Unicode strings. -- Function: uint8_t * u8_strncat (uint8_t *DEST, const uint8_t *SRC, size_t N) -- Function: uint16_t * u16_strncat (uint16_t *DEST, const uint16_t *SRC, size_t N) -- Function: uint32_t * u32_strncat (uint32_t *DEST, const uint32_t *SRC, size_t N) Appends no more than N units of SRC onto DEST. This function is similar to ‘strncat’ and ‘wcsncat’, except that it operates on Unicode strings. 4.5.4 Comparing NUL terminated Unicode strings ---------------------------------------------- The following functions compare two Unicode strings. They ignore locale-dependent collation rules. -- Function: int u8_strcmp (const uint8_t *S1, const uint8_t *S2) -- Function: int u16_strcmp (const uint16_t *S1, const uint16_t *S2) -- Function: int u32_strcmp (const uint32_t *S1, const uint32_t *S2) Compares S1 and S2, lexicographically. Returns a negative value if S1 compares smaller than S2, a positive value if S1 compares larger than S2, or 0 if they compare equal. This function is similar to ‘strcmp’ and ‘wcscmp’, except that it operates on Unicode strings. -- Function: int u8_strcoll (const uint8_t *S1, const uint8_t *S2) -- Function: int u16_strcoll (const uint16_t *S1, const uint16_t *S2) -- Function: int u32_strcoll (const uint32_t *S1, const uint32_t *S2) Compares S1 and S2 using the collation rules of the current locale. Returns -1 if S1 < S2, 0 if S1 = S2, 1 if S1 > S2. Upon failure, sets ‘errno’ and returns any value. This function is similar to ‘strcoll’ and ‘wcscoll’, except that it operates on Unicode strings. Note that this function may consider different canonical normalizations of the same string as having a large distance. It is therefore better to use the function ‘u8_normcoll’ instead of this one; see *note uninorm.h::. -- Function: int u8_strncmp (const uint8_t *S1, const uint8_t *S2, size_t N) -- Function: int u16_strncmp (const uint16_t *S1, const uint16_t *S2, size_t N) -- Function: int u32_strncmp (const uint32_t *S1, const uint32_t *S2, size_t N) Compares no more than N units of S1 and S2. This function is similar to ‘strncmp’ and ‘wcsncmp’, except that it operates on Unicode strings. 4.5.5 Duplicating a NUL terminated Unicode string ------------------------------------------------- The following function allocates a duplicate of a Unicode string. -- Function: uint8_t * u8_strdup (const uint8_t *S) -- Function: uint16_t * u16_strdup (const uint16_t *S) -- Function: uint32_t * u32_strdup (const uint32_t *S) Duplicates S, returning an identical malloc’d string. This function is similar to ‘strdup’ and ‘wcsdup’, except that it operates on Unicode strings. 4.5.6 Searching for a character in a NUL terminated Unicode string ------------------------------------------------------------------ The following functions search for a given Unicode character. -- Function: uint8_t * u8_strchr (const uint8_t *STR, ucs4_t UC) -- Function: uint16_t * u16_strchr (const uint16_t *STR, ucs4_t UC) -- Function: uint32_t * u32_strchr (const uint32_t *STR, ucs4_t UC) Finds the first occurrence of UC in STR. This function is similar to ‘strchr’ and ‘wcschr’, except that it operates on Unicode strings. -- Function: uint8_t * u8_strrchr (const uint8_t *STR, ucs4_t UC) -- Function: uint16_t * u16_strrchr (const uint16_t *STR, ucs4_t UC) -- Function: uint32_t * u32_strrchr (const uint32_t *STR, ucs4_t UC) Finds the last occurrence of UC in STR. This function is similar to ‘strrchr’ and ‘wcsrchr’, except that it operates on Unicode strings. The following functions search for the first occurrence of some Unicode character in or outside a given set of Unicode characters. -- Function: size_t u8_strcspn (const uint8_t *STR, const uint8_t *REJECT) -- Function: size_t u16_strcspn (const uint16_t *STR, const uint16_t *REJECT) -- Function: size_t u32_strcspn (const uint32_t *STR, const uint32_t *REJECT) Returns the length of the initial segment of STR which consists entirely of Unicode characters not in REJECT. This function is similar to ‘strcspn’ and ‘wcscspn’, except that it operates on Unicode strings. -- Function: size_t u8_strspn (const uint8_t *STR, const uint8_t *ACCEPT) -- Function: size_t u16_strspn (const uint16_t *STR, const uint16_t *ACCEPT) -- Function: size_t u32_strspn (const uint32_t *STR, const uint32_t *ACCEPT) Returns the length of the initial segment of STR which consists entirely of Unicode characters in ACCEPT. This function is similar to ‘strspn’ and ‘wcsspn’, except that it operates on Unicode strings. -- Function: uint8_t * u8_strpbrk (const uint8_t *STR, const uint8_t *ACCEPT) -- Function: uint16_t * u16_strpbrk (const uint16_t *STR, const uint16_t *ACCEPT) -- Function: uint32_t * u32_strpbrk (const uint32_t *STR, const uint32_t *ACCEPT) Finds the first occurrence in STR of any character in ACCEPT. This function is similar to ‘strpbrk’ and ‘wcspbrk’, except that it operates on Unicode strings. 4.5.7 Searching for a substring in a NUL terminated Unicode string ------------------------------------------------------------------ The following functions search whether a given Unicode string is a substring of another Unicode string. -- Function: uint8_t * u8_strstr (const uint8_t *HAYSTACK, const uint8_t *NEEDLE) -- Function: uint16_t * u16_strstr (const uint16_t *HAYSTACK, const uint16_t *NEEDLE) -- Function: uint32_t * u32_strstr (const uint32_t *HAYSTACK, const uint32_t *NEEDLE) Finds the first occurrence of NEEDLE in HAYSTACK. This function is similar to ‘strstr’ and ‘wcsstr’, except that it operates on Unicode strings. -- Function: bool u8_startswith (const uint8_t *STR, const uint8_t *PREFIX) -- Function: bool u16_startswith (const uint16_t *STR, const uint16_t *PREFIX) -- Function: bool u32_startswith (const uint32_t *STR, const uint32_t *PREFIX) Tests whether STR starts with PREFIX. -- Function: bool u8_endswith (const uint8_t *STR, const uint8_t *SUFFIX) -- Function: bool u16_endswith (const uint16_t *STR, const uint16_t *SUFFIX) -- Function: bool u32_endswith (const uint32_t *STR, const uint32_t *SUFFIX) Tests whether STR ends with SUFFIX. 4.5.8 Tokenizing a NUL terminated Unicode string ------------------------------------------------ The following function does one step in tokenizing a Unicode string. -- Function: uint8_t * u8_strtok (uint8_t *STR, const uint8_t *DELIM, uint8_t **PTR) -- Function: uint16_t * u16_strtok (uint16_t *STR, const uint16_t *DELIM, uint16_t **PTR) -- Function: uint32_t * u32_strtok (uint32_t *STR, const uint32_t *DELIM, uint32_t **PTR) Divides STR into tokens separated by characters in DELIM. This function is similar to ‘strtok_r’ and ‘wcstok’, except that it operates on Unicode strings. Its interface is actually more similar to ‘wcstok’ than to ‘strtok’. 5 Conversions between Unicode and encodings ‘’ ********************************************************* This include file declares functions for converting between Unicode strings and ‘char *’ strings in locale encoding or in other specified encodings. The following function returns the locale encoding. -- Function: const char * locale_charset () Determines the current locale’s character encoding, and canonicalizes it into one of the canonical names listed in ‘localcharset.h’. If the canonical name cannot be determined, the result is a non-canonical name. The result must not be freed; it is statically allocated. The result of this function can be used as an argument to the ‘iconv_open’ function in GNU libc, in GNU libiconv, or in the gnulib provided wrapper around the native ‘iconv_open’ function. It may not work as an argument to the native ‘iconv_open’ function directly. The handling of unconvertible characters during the conversions can be parametrized through the following enumeration type: -- Type: enum iconv_ilseq_handler This type specifies how unconvertible characters in the input are handled. -- Constant: enum iconv_ilseq_handler iconveh_error This handler causes the function to return with ‘errno’ set to ‘EILSEQ’. -- Constant: enum iconv_ilseq_handler iconveh_question_mark This handler produces one question mark ‘?’ per unconvertible character. -- Constant: enum iconv_ilseq_handler iconveh_question_replacement_character This handler produces one U+FFFD per unconvertible character if that fits in the target encoding, otherwise one question mark ‘?’ per unconvertible character. -- Constant: enum iconv_ilseq_handler iconveh_escape_sequence This handler produces an escape sequence ‘\uXXXX’ or ‘\UXXXXXXXX’ for each unconvertible character. The following functions convert between strings in a specified encoding and Unicode strings. -- Function: uint8_t * u8_conv_from_encoding (const char *FROMCODE, enum iconv_ilseq_handler HANDLER, const char *SRC, size_t SRCLEN, size_t *OFFSETS, uint8_t *RESULTBUF, size_t *LENGTHP) -- Function: uint16_t * u16_conv_from_encoding (const char *FROMCODE, enum iconv_ilseq_handler HANDLER, const char *SRC, size_t SRCLEN, size_t *OFFSETS, uint16_t *RESULTBUF, size_t *LENGTHP) -- Function: uint32_t * u32_conv_from_encoding (const char *FROMCODE, enum iconv_ilseq_handler HANDLER, const char *SRC, size_t SRCLEN, size_t *OFFSETS, uint32_t *RESULTBUF, size_t *LENGTHP) Converts an entire string, possibly including NUL bytes, from one encoding to UTF-8 encoding. Converts a memory region given in encoding FROMCODE. FROMCODE is as for the ‘iconv_open’ function. The input is in the memory region between SRC (inclusive) and ‘SRC + SRCLEN’ (exclusive). If OFFSETS is not NULL, it should point to an array of SRCLEN integers; this array is filled with offsets into the result, i.e. the character starting at ‘SRC[i]’ corresponds to the character starting at ‘RESULT[OFFSETS[i]]’, and other offsets are set to ‘(size_t)(-1)’. ‘RESULTBUF’ and ‘*LENGTHP’ should be a scratch buffer and its size, or ‘RESULTBUF’ can be NULL. May erase the contents of the memory at ‘RESULTBUF’. If successful: The resulting Unicode string (non-NULL) is returned and its length stored in ‘*LENGTHP’. The resulting string is ‘RESULTBUF’ if no dynamic memory allocation was necessary, or a freshly allocated memory block otherwise. In case of error: NULL is returned and ‘errno’ is set. Particular ‘errno’ values: ‘EINVAL’, ‘EILSEQ’, ‘ENOMEM’. -- Function: char * u8_conv_to_encoding (const char *TOCODE, enum iconv_ilseq_handler HANDLER, const uint8_t *SRC, size_t SRCLEN, size_t *OFFSETS, char *RESULTBUF, size_t *LENGTHP) -- Function: char * u16_conv_to_encoding (const char *TOCODE, enum iconv_ilseq_handler HANDLER, const uint16_t *SRC, size_t SRCLEN, size_t *OFFSETS, char *RESULTBUF, size_t *LENGTHP) -- Function: char * u32_conv_to_encoding (const char *TOCODE, enum iconv_ilseq_handler HANDLER, const uint32_t *SRC, size_t SRCLEN, size_t *OFFSETS, char *RESULTBUF, size_t *LENGTHP) Converts an entire Unicode string, possibly including NUL units, from UTF-8 encoding to a given encoding. Converts a memory region to encoding TOCODE. TOCODE is as for the ‘iconv_open’ function. The input is in the memory region between SRC (inclusive) and ‘SRC + SRCLEN’ (exclusive). If OFFSETS is not NULL, it should point to an array of SRCLEN integers; this array is filled with offsets into the result, i.e. the character starting at ‘SRC[i]’ corresponds to the character starting at ‘RESULT[OFFSETS[i]]’, and other offsets are set to ‘(size_t)(-1)’. ‘RESULTBUF’ and ‘*LENGTHP’ should be a scratch buffer and its size, or ‘RESULTBUF’ can be NULL. May erase the contents of the memory at ‘RESULTBUF’. If successful: The resulting Unicode string (non-NULL) is returned and its length stored in ‘*LENGTHP’. The resulting string is ‘RESULTBUF’ if no dynamic memory allocation was necessary, or a freshly allocated memory block otherwise. In case of error: NULL is returned and ‘errno’ is set. Particular ‘errno’ values: ‘EINVAL’, ‘EILSEQ’, ‘ENOMEM’. The following functions convert between NUL terminated strings in a specified encoding and NUL terminated Unicode strings. -- Function: uint8_t * u8_strconv_from_encoding (const char *STRING, const char *FROMCODE, enum iconv_ilseq_handler HANDLER) -- Function: uint16_t * u16_strconv_from_encoding (const char *STRING, const char *FROMCODE, enum iconv_ilseq_handler HANDLER) -- Function: uint32_t * u32_strconv_from_encoding (const char *STRING, const char *FROMCODE, enum iconv_ilseq_handler HANDLER) Converts a NUL terminated string from a given encoding. The result is ‘malloc’ allocated, or NULL (with ERRNO set) in case of error. Particular ‘errno’ values: ‘EILSEQ’, ‘ENOMEM’. -- Function: char * u8_strconv_to_encoding (const uint8_t *STRING, const char *TOCODE, enum iconv_ilseq_handler HANDLER) -- Function: char * u16_strconv_to_encoding (const uint16_t *STRING, const char *TOCODE, enum iconv_ilseq_handler HANDLER) -- Function: char * u32_strconv_to_encoding (const uint32_t *STRING, const char *TOCODE, enum iconv_ilseq_handler HANDLER) Converts a NUL terminated string to a given encoding. The result is ‘malloc’ allocated, or NULL (with ‘errno’ set) in case of error. Particular ‘errno’ values: ‘EILSEQ’, ‘ENOMEM’. The following functions are shorthands that convert between NUL terminated strings in locale encoding and NUL terminated Unicode strings. -- Function: uint8_t * u8_strconv_from_locale (const char *STRING) -- Function: uint16_t * u16_strconv_from_locale (const char *STRING) -- Function: uint32_t * u32_strconv_from_locale (const char *STRING) Converts a NUL terminated string from the locale encoding. The result is ‘malloc’ allocated, or NULL (with ‘errno’ set) in case of error. Particular ‘errno’ values: ‘ENOMEM’. -- Function: char * u8_strconv_to_locale (const uint8_t *STRING) -- Function: char * u16_strconv_to_locale (const uint16_t *STRING) -- Function: char * u32_strconv_to_locale (const uint32_t *STRING) Converts a NUL terminated string to the locale encoding. The result is ‘malloc’ allocated, or NULL (with ‘errno’ set) in case of error. Particular ‘errno’ values: ‘ENOMEM’. 6 Output with Unicode strings ‘’ ******************************************** This include file declares functions for doing formatted output with Unicode strings. It defines a set of functions similar to ‘fprintf’ and ‘sprintf’, which are declared in ‘’. These functions work like the ‘printf’ function family. In the format string: • The format directive ‘U’ takes an UTF-8 string (‘const uint8_t *’). • The format directive ‘lU’ takes an UTF-16 string (‘const uint16_t *’). • The format directive ‘llU’ takes an UTF-32 string (‘const uint32_t *’). • The format directive ‘n’ is not supported, for security reasons. A function name with an infix ‘v’ indicates that a ‘va_list’ is passed instead of multiple arguments. The functions ‘*sprintf’ have a BUF argument that is assumed to be large enough. (_DANGEROUS! Overflowing the buffer will crash the program._) The functions ‘*snprintf’ have a BUF argument that is assumed to be SIZE units large. (_DANGEROUS! The resulting string might be truncated in the middle of a multibyte character._) The functions ‘*asprintf’ have a RESULTP argument. The result will be freshly allocated and stored in ‘*resultp’. The functions ‘*asnprintf’ have a (RESULTBUF, LENGTHP) argument pair. If RESULTBUF is not NULL and the result fits into ‘*LENGTHP’ units, it is put in RESULTBUF, and RESULTBUF is returned. Otherwise, a freshly allocated string is returned. In both cases, ‘*LENGTHP’ is set to the length (number of units) of the returned string. In case of error, NULL is returned and ‘errno’ is set. The following functions take an ASCII format string and return a result that is a ‘char *’ string in locale encoding. -- Function: int ulc_sprintf (char *BUF, const char *FORMAT, ...) -- Function: int ulc_snprintf (char *BUF, size_t size, const char *FORMAT, ...) -- Function: int ulc_asprintf (char **RESULTP, const char *FORMAT, ...) -- Function: char * ulc_asnprintf (char *RESULTBUF, size_t *LENGTHP, const char *FORMAT, ...) -- Function: int ulc_vsprintf (char *BUF, const char *FORMAT, va_list AP) -- Function: int ulc_vsnprintf (char *BUF, size_t size, const char *FORMAT, va_list AP) -- Function: int ulc_vasprintf (char **RESULTP, const char *FORMAT, va_list AP) -- Function: char * ulc_vasnprintf (char *RESULTBUF, size_t *LENGTHP, const char *FORMAT, va_list AP) The following functions take an ASCII format string and return a result in UTF-8 format. -- Function: int u8_sprintf (uint8_t *BUF, const char *FORMAT, ...) -- Function: int u8_snprintf (uint8_t *BUF, size_t SIZE, const char *FORMAT, ...) -- Function: int u8_asprintf (uint8_t **RESULTP, const char *FORMAT, ...) -- Function: uint8_t * u8_asnprintf (uint8_t *RESULTBUF, size_t *LENGTHP, const char *FORMAT, ...) -- Function: int u8_vsprintf (uint8_t *BUF, const char *FORMAT, va_list ap) -- Function: int u8_vsnprintf (uint8_t *BUF, size_t SIZE, const char *FORMAT, va_list AP) -- Function: int u8_vasprintf (uint8_t **RESULTP, const char *FORMAT, va_list AP) -- Function: uint8_t * u8_vasnprintf (uint8_t *resultbuf, size_t *LENGTHP, const char *FORMAT, va_list AP) The following functions take an UTF-8 format string and return a result in UTF-8 format. -- Function: int u8_u8_sprintf (uint8_t *BUF, const uint8_t *FORMAT, ...) -- Function: int u8_u8_snprintf (uint8_t *BUF, size_t SIZE, const uint8_t *FORMAT, ...) -- Function: int u8_u8_asprintf (uint8_t **RESULTP, const uint8_t *FORMAT, ...) -- Function: uint8_t * u8_u8_asnprintf (uint8_t *resultbuf, size_t *LENGTHP, const uint8_t *FORMAT, ...) -- Function: int u8_u8_vsprintf (uint8_t *BUF, const uint8_t *FORMAT, va_list AP) -- Function: int u8_u8_vsnprintf (uint8_t *BUF, size_t SIZE, const uint8_t *FORMAT, va_list AP) -- Function: int u8_u8_vasprintf (uint8_t **RESULTP, const uint8_t *FORMAT, va_list AP) -- Function: uint8_t * u8_u8_vasnprintf (uint8_t *resultbuf, size_t *LENGTHP, const uint8_t *FORMAT, va_list AP) The following functions take an ASCII format string and return a result in UTF-16 format. -- Function: int u16_sprintf (uint16_t *BUF, const char *FORMAT, ...) -- Function: int u16_snprintf (uint16_t *BUF, size_t SIZE, const char *FORMAT, ...) -- Function: int u16_asprintf (uint16_t **RESULTP, const char *FORMAT, ...) -- Function: uint16_t * u16_asnprintf (uint16_t *RESULTBUF, size_t *LENGTHP, const char *FORMAT, ...) -- Function: int u16_vsprintf (uint16_t *BUF, const char *FORMAT, va_list ap) -- Function: int u16_vsnprintf (uint16_t *BUF, size_t SIZE, const char *FORMAT, va_list AP) -- Function: int u16_vasprintf (uint16_t **RESULTP, const char *FORMAT, va_list AP) -- Function: uint16_t * u16_vasnprintf (uint16_t *resultbuf, size_t *LENGTHP, const char *FORMAT, va_list AP) The following functions take an UTF-16 format string and return a result in UTF-16 format. -- Function: int u16_u16_sprintf (uint16_t *BUF, const uint16_t *FORMAT, ...) -- Function: int u16_u16_snprintf (uint16_t *BUF, size_t SIZE, const uint16_t *FORMAT, ...) -- Function: int u16_u16_asprintf (uint16_t **RESULTP, const uint16_t *FORMAT, ...) -- Function: uint16_t * u16_u16_asnprintf (uint16_t *resultbuf, size_t *LENGTHP, const uint16_t *FORMAT, ...) -- Function: int u16_u16_vsprintf (uint16_t *BUF, const uint16_t *FORMAT, va_list AP) -- Function: int u16_u16_vsnprintf (uint16_t *BUF, size_t SIZE, const uint16_t *FORMAT, va_list AP) -- Function: int u16_u16_vasprintf (uint16_t **RESULTP, const uint16_t *FORMAT, va_list AP) -- Function: uint16_t * u16_u16_vasnprintf (uint16_t *resultbuf, size_t *LENGTHP, const uint16_t *FORMAT, va_list AP) The following functions take an ASCII format string and return a result in UTF-32 format. -- Function: int u32_sprintf (uint32_t *BUF, const char *FORMAT, ...) -- Function: int u32_snprintf (uint32_t *BUF, size_t SIZE, const char *FORMAT, ...) -- Function: int u32_asprintf (uint32_t **RESULTP, const char *FORMAT, ...) -- Function: uint32_t * u32_asnprintf (uint32_t *RESULTBUF, size_t *LENGTHP, const char *FORMAT, ...) -- Function: int u32_vsprintf (uint32_t *BUF, const char *FORMAT, va_list ap) -- Function: int u32_vsnprintf (uint32_t *BUF, size_t SIZE, const char *FORMAT, va_list AP) -- Function: int u32_vasprintf (uint32_t **RESULTP, const char *FORMAT, va_list AP) -- Function: uint32_t * u32_vasnprintf (uint32_t *resultbuf, size_t *LENGTHP, const char *FORMAT, va_list AP) The following functions take an UTF-32 format string and return a result in UTF-32 format. -- Function: int u32_u32_sprintf (uint32_t *BUF, const uint32_t *FORMAT, ...) -- Function: int u32_u32_snprintf (uint32_t *BUF, size_t SIZE, const uint32_t *FORMAT, ...) -- Function: int u32_u32_asprintf (uint32_t **RESULTP, const uint32_t *FORMAT, ...) -- Function: uint32_t * u32_u32_asnprintf (uint32_t *resultbuf, size_t *LENGTHP, const uint32_t *FORMAT, ...) -- Function: int u32_u32_vsprintf (uint32_t *BUF, const uint32_t *FORMAT, va_list AP) -- Function: int u32_u32_vsnprintf (uint32_t *BUF, size_t SIZE, const uint32_t *FORMAT, va_list AP) -- Function: int u32_u32_vasprintf (uint32_t **RESULTP, const uint32_t *FORMAT, va_list AP) -- Function: uint32_t * u32_u32_vasnprintf (uint32_t *resultbuf, size_t *LENGTHP, const uint32_t *FORMAT, va_list AP) The following functions take an ASCII format string and produce output in locale encoding to a ‘FILE’ stream. -- Function: int ulc_fprintf (FILE *STREAM, const char *FORMAT, ...) -- Function: int ulc_vfprintf (FILE *STREAM, const char *FORMAT, va_list AP) 7 Names of Unicode characters ‘’ ******************************************* This include file implements the association between a Unicode character and its name. The name of a Unicode character allows to distinguish it from other, similar looking characters. For example, the character ‘x’ has the name ‘"LATIN SMALL LETTER X"’ and is therefore different from the character named ‘"MULTIPLICATION SIGN"’. -- Macro: unsigned int UNINAME_MAX This macro expands to a constant that is the required size of buffer for a Unicode character name. -- Function: char * unicode_character_name (ucs4_t UC, char *BUF) Looks up the name of a Unicode character, in uppercase ASCII. BUF must point to a buffer, at least ‘UNINAME_MAX’ bytes in size. Returns the filled BUF, or NULL if the character does not have a name. -- Function: ucs4_t unicode_name_character (const char *NAME) Looks up the Unicode character with a given name, in upper- or lowercase ASCII. NAME can also be an alias name of a character. Returns the character if found, or ‘UNINAME_INVALID’ if not found. -- Macro: ucs4_t UNINAME_INVALID This macro expands to a constant that is a special return value of the ‘unicode_name_character’ function. 8 Unicode character classification and properties ‘’ **************************************************************** This include file declares functions that classify Unicode characters and that test whether Unicode characters have specific properties. The classification assigns a “general category” to every Unicode character. This is similar to the classification provided by ISO C in ‘’. Properties are the data that guides various text processing algorithms in the presence of specific Unicode characters. 8.1 General category ==================== Every Unicode character or code point has a _general category_ assigned to it. This classification is important for most algorithms that work on Unicode text. The GNU libunistring library provides two kinds of API for working with general categories. The object oriented API uses a variable to denote every predefined general category value or combinations thereof. The low-level API uses a bit mask instead. The advantage of the object oriented API is that if only a few predefined general category values are used, the data tables are relatively small. When you combine general category values (using ‘uc_general_category_or’, ‘uc_general_category_and’, or ‘uc_general_category_and_not’), or when you use the low level bit masks, a big table is used thats holds the complete general category information for all Unicode characters. 8.1.1 The object oriented API for general category -------------------------------------------------- -- Type: uc_general_category_t This data type denotes a general category value. It is an immediate type that can be copied by simple assignment, without involving memory allocation. It is not an array type. The following are the predefined general category value. Additional general categories may be added in the future. The ‘UC_CATEGORY_*’ constants reflect the systematic general category values assigned by the Unicode Consortium. Whereas the other ‘UC_*’ macros are aliases, for use when readable code is preferred. -- Constant: uc_general_category_t UC_CATEGORY_L -- Macro: uc_general_category_t UC_LETTER This represents the general category “Letter”. -- Constant: uc_general_category_t UC_CATEGORY_LC -- Macro: uc_general_category_t UC_CASED_LETTER -- Constant: uc_general_category_t UC_CATEGORY_Lu -- Macro: uc_general_category_t UC_UPPERCASE_LETTER This represents the general category “Letter, uppercase”. -- Constant: uc_general_category_t UC_CATEGORY_Ll -- Macro: uc_general_category_t UC_LOWERCASE_LETTER This represents the general category “Letter, lowercase”. -- Constant: uc_general_category_t UC_CATEGORY_Lt -- Macro: uc_general_category_t UC_TITLECASE_LETTER This represents the general category “Letter, titlecase”. -- Constant: uc_general_category_t UC_CATEGORY_Lm -- Macro: uc_general_category_t UC_MODIFIER_LETTER This represents the general category “Letter, modifier”. -- Constant: uc_general_category_t UC_CATEGORY_Lo -- Macro: uc_general_category_t UC_OTHER_LETTER This represents the general category “Letter, other”. -- Constant: uc_general_category_t UC_CATEGORY_M -- Macro: uc_general_category_t UC_MARK This represents the general category “Marker”. -- Constant: uc_general_category_t UC_CATEGORY_Mn -- Macro: uc_general_category_t UC_NON_SPACING_MARK This represents the general category “Marker, nonspacing”. -- Constant: uc_general_category_t UC_CATEGORY_Mc -- Macro: uc_general_category_t UC_COMBINING_SPACING_MARK This represents the general category “Marker, spacing combining”. -- Constant: uc_general_category_t UC_CATEGORY_Me -- Macro: uc_general_category_t UC_ENCLOSING_MARK This represents the general category “Marker, enclosing”. -- Constant: uc_general_category_t UC_CATEGORY_N -- Macro: uc_general_category_t UC_NUMBER This represents the general category “Number”. -- Constant: uc_general_category_t UC_CATEGORY_Nd -- Macro: uc_general_category_t UC_DECIMAL_DIGIT_NUMBER This represents the general category “Number, decimal digit”. -- Constant: uc_general_category_t UC_CATEGORY_Nl -- Macro: uc_general_category_t UC_LETTER_NUMBER This represents the general category “Number, letter”. -- Constant: uc_general_category_t UC_CATEGORY_No -- Macro: uc_general_category_t UC_OTHER_NUMBER This represents the general category “Number, other”. -- Constant: uc_general_category_t UC_CATEGORY_P -- Macro: uc_general_category_t UC_PUNCTUATION This represents the general category “Punctuation”. -- Constant: uc_general_category_t UC_CATEGORY_Pc -- Macro: uc_general_category_t UC_CONNECTOR_PUNCTUATION This represents the general category “Punctuation, connector”. -- Constant: uc_general_category_t UC_CATEGORY_Pd -- Macro: uc_general_category_t UC_DASH_PUNCTUATION This represents the general category “Punctuation, dash”. -- Constant: uc_general_category_t UC_CATEGORY_Ps -- Macro: uc_general_category_t UC_OPEN_PUNCTUATION This represents the general category “Punctuation, open”, a.k.a. “start punctuation”. -- Constant: uc_general_category_t UC_CATEGORY_Pe -- Macro: uc_general_category_t UC_CLOSE_PUNCTUATION This represents the general category “Punctuation, close”, a.k.a. “end punctuation”. -- Constant: uc_general_category_t UC_CATEGORY_Pi -- Macro: uc_general_category_t UC_INITIAL_QUOTE_PUNCTUATION This represents the general category “Punctuation, initial quote”. -- Constant: uc_general_category_t UC_CATEGORY_Pf -- Macro: uc_general_category_t UC_FINAL_QUOTE_PUNCTUATION This represents the general category “Punctuation, final quote”. -- Constant: uc_general_category_t UC_CATEGORY_Po -- Macro: uc_general_category_t UC_OTHER_PUNCTUATION This represents the general category “Punctuation, other”. -- Constant: uc_general_category_t UC_CATEGORY_S -- Macro: uc_general_category_t UC_SYMBOL This represents the general category “Symbol”. -- Constant: uc_general_category_t UC_CATEGORY_Sm -- Macro: uc_general_category_t UC_MATH_SYMBOL This represents the general category “Symbol, math”. -- Constant: uc_general_category_t UC_CATEGORY_Sc -- Macro: uc_general_category_t UC_CURRENCY_SYMBOL This represents the general category “Symbol, currency”. -- Constant: uc_general_category_t UC_CATEGORY_Sk -- Macro: uc_general_category_t UC_MODIFIER_SYMBOL This represents the general category “Symbol, modifier”. -- Constant: uc_general_category_t UC_CATEGORY_So -- Macro: uc_general_category_t UC_OTHER_SYMBOL This represents the general category “Symbol, other”. -- Constant: uc_general_category_t UC_CATEGORY_Z -- Macro: uc_general_category_t UC_SEPARATOR This represents the general category “Separator”. -- Constant: uc_general_category_t UC_CATEGORY_Zs -- Macro: uc_general_category_t UC_SPACE_SEPARATOR This represents the general category “Separator, space”. -- Constant: uc_general_category_t UC_CATEGORY_Zl -- Macro: uc_general_category_t UC_LINE_SEPARATOR This represents the general category “Separator, line”. -- Constant: uc_general_category_t UC_CATEGORY_Zp -- Macro: uc_general_category_t UC_PARAGRAPH_SEPARATOR This represents the general category “Separator, paragraph”. -- Constant: uc_general_category_t UC_CATEGORY_C -- Macro: uc_general_category_t UC_OTHER This represents the general category “Other”. -- Constant: uc_general_category_t UC_CATEGORY_Cc -- Macro: uc_general_category_t UC_CONTROL This represents the general category “Other, control”. -- Constant: uc_general_category_t UC_CATEGORY_Cf -- Macro: uc_general_category_t UC_FORMAT This represents the general category “Other, format”. -- Constant: uc_general_category_t UC_CATEGORY_Cs -- Macro: uc_general_category_t UC_SURROGATE This represents the general category “Other, surrogate”. All code points in this category are invalid characters. -- Constant: uc_general_category_t UC_CATEGORY_Co -- Macro: uc_general_category_t UC_PRIVATE_USE This represents the general category “Other, private use”. -- Constant: uc_general_category_t UC_CATEGORY_Cn -- Macro: uc_general_category_t UC_UNASSIGNED This represents the general category “Other, not assigned”. Some code points in this category are invalid characters. The following functions combine general categories, like in a boolean algebra, except that there is no ‘not’ operation. -- Function: uc_general_category_t uc_general_category_or (uc_general_category_t CATEGORY1, uc_general_category_t CATEGORY2) Returns the union of two general categories. This corresponds to the unions of the two sets of characters. -- Function: uc_general_category_t uc_general_category_and (uc_general_category_t CATEGORY1, uc_general_category_t CATEGORY2) Returns the intersection of two general categories as bit masks. This _does not_ correspond to the intersection of the two sets of characters. -- Function: uc_general_category_t uc_general_category_and_not (uc_general_category_t CATEGORY1, uc_general_category_t CATEGORY2) Returns the intersection of a general category with the complement of a second general category, as bit masks. This _does not_ correspond to the intersection with complement, when viewing the categories as sets of characters. The following functions associate general categories with their name. -- Function: const char * uc_general_category_name (uc_general_category_t CATEGORY) Returns the name of a general category, more precisely, the abbreviated name. Returns NULL if the general category corresponds to a bit mask that does not have a name. -- Function: const char * uc_general_category_long_name (uc_general_category_t CATEGORY) Returns the long name of a general category. Returns NULL if the general category corresponds to a bit mask that does not have a name. -- Function: uc_general_category_t uc_general_category_byname (const char *CATEGORY_NAME) Returns the general category given by name, e.g. ‘"Lu"’, or by long name, e.g. ‘"Uppercase Letter"’. This lookup ignores spaces, underscores, or hyphens as word separators and is case-insignificant. The following functions view general categories as sets of Unicode characters. -- Function: uc_general_category_t uc_general_category (ucs4_t UC) Returns the general category of a Unicode character. This function uses a big table. -- Function: bool uc_is_general_category (ucs4_t UC, uc_general_category_t CATEGORY) Tests whether a Unicode character belongs to a given category. The CATEGORY argument can be a predefined general category or the combination of several predefined general categories. 8.1.2 The bit mask API for general category ------------------------------------------- The following are the predefined general category value as bit masks. Additional general categories may be added in the future. -- Macro: uint32_t UC_CATEGORY_MASK_L -- Macro: uint32_t UC_CATEGORY_MASK_LC -- Macro: uint32_t UC_CATEGORY_MASK_Lu -- Macro: uint32_t UC_CATEGORY_MASK_Ll -- Macro: uint32_t UC_CATEGORY_MASK_Lt -- Macro: uint32_t UC_CATEGORY_MASK_Lm -- Macro: uint32_t UC_CATEGORY_MASK_Lo -- Macro: uint32_t UC_CATEGORY_MASK_M -- Macro: uint32_t UC_CATEGORY_MASK_Mn -- Macro: uint32_t UC_CATEGORY_MASK_Mc -- Macro: uint32_t UC_CATEGORY_MASK_Me -- Macro: uint32_t UC_CATEGORY_MASK_N -- Macro: uint32_t UC_CATEGORY_MASK_Nd -- Macro: uint32_t UC_CATEGORY_MASK_Nl -- Macro: uint32_t UC_CATEGORY_MASK_No -- Macro: uint32_t UC_CATEGORY_MASK_P -- Macro: uint32_t UC_CATEGORY_MASK_Pc -- Macro: uint32_t UC_CATEGORY_MASK_Pd -- Macro: uint32_t UC_CATEGORY_MASK_Ps -- Macro: uint32_t UC_CATEGORY_MASK_Pe -- Macro: uint32_t UC_CATEGORY_MASK_Pi -- Macro: uint32_t UC_CATEGORY_MASK_Pf -- Macro: uint32_t UC_CATEGORY_MASK_Po -- Macro: uint32_t UC_CATEGORY_MASK_S -- Macro: uint32_t UC_CATEGORY_MASK_Sm -- Macro: uint32_t UC_CATEGORY_MASK_Sc -- Macro: uint32_t UC_CATEGORY_MASK_Sk -- Macro: uint32_t UC_CATEGORY_MASK_So -- Macro: uint32_t UC_CATEGORY_MASK_Z -- Macro: uint32_t UC_CATEGORY_MASK_Zs -- Macro: uint32_t UC_CATEGORY_MASK_Zl -- Macro: uint32_t UC_CATEGORY_MASK_Zp -- Macro: uint32_t UC_CATEGORY_MASK_C -- Macro: uint32_t UC_CATEGORY_MASK_Cc -- Macro: uint32_t UC_CATEGORY_MASK_Cf -- Macro: uint32_t UC_CATEGORY_MASK_Cs -- Macro: uint32_t UC_CATEGORY_MASK_Co -- Macro: uint32_t UC_CATEGORY_MASK_Cn The following function views general categories as sets of Unicode characters. -- Function: bool uc_is_general_category_withtable (ucs4_t UC, uint32_t BITMASK) Tests whether a Unicode character belongs to a given category. The BITMASK argument can be a predefined general category bitmask or the combination of several predefined general category bitmasks. This function uses a big table comprising all general categories. 8.2 Canonical combining class ============================= Every Unicode character or code point has a _canonical combining class_ assigned to it. What is the meaning of the canonical combining class? Essentially, it indicates the priority with which a combining character is attached to its base character. The characters for which the canonical combining class is 0 are the base characters, and the characters for which it is greater than 0 are the combining characters. Combining characters are rendered near/attached/around their base character, and combining characters with small combining classes are attached "first" or "closer" to the base character. The canonical combining class of a character is a number in the range 0..255. The possible values are described in the Unicode Character Database . The list here is not definitive; more values can be added in future versions. -- Constant: int UC_CCC_NR The canonical combining class value for “Not Reordered” characters. The value is 0. -- Constant: int UC_CCC_OV The canonical combining class value for “Overlay” characters. -- Constant: int UC_CCC_NK The canonical combining class value for “Nukta” characters. -- Constant: int UC_CCC_KV The canonical combining class value for “Kana Voicing” characters. -- Constant: int UC_CCC_VR The canonical combining class value for “Virama” characters. -- Constant: int UC_CCC_ATBL The canonical combining class value for “Attached Below Left” characters. -- Constant: int UC_CCC_ATB The canonical combining class value for “Attached Below” characters. -- Constant: int UC_CCC_ATA The canonical combining class value for “Attached Above” characters. -- Constant: int UC_CCC_ATAR The canonical combining class value for “Attached Above Right” characters. -- Constant: int UC_CCC_BL The canonical combining class value for “Below Left” characters. -- Constant: int UC_CCC_B The canonical combining class value for “Below” characters. -- Constant: int UC_CCC_BR The canonical combining class value for “Below Right” characters. -- Constant: int UC_CCC_L The canonical combining class value for “Left” characters. -- Constant: int UC_CCC_R The canonical combining class value for “Right” characters. -- Constant: int UC_CCC_AL The canonical combining class value for “Above Left” characters. -- Constant: int UC_CCC_A The canonical combining class value for “Above” characters. -- Constant: int UC_CCC_AR The canonical combining class value for “Above Right” characters. -- Constant: int UC_CCC_DB The canonical combining class value for “Double Below” characters. -- Constant: int UC_CCC_DA The canonical combining class value for “Double Above” characters. -- Constant: int UC_CCC_IS The canonical combining class value for “Iota Subscript” characters. The following functions associate canonical combining classes with their name. -- Function: const char * uc_combining_class_name (int CCC) Returns the name of a canonical combining class, more precisely, the abbreviated name. Returns NULL if the canonical combining class is a numeric value without a name. -- Function: const char * uc_combining_class_long_name (int CCC) Returns the long name of a canonical combining class. Returns NULL if the canonical combining class is a numeric value without a name. -- Function: int uc_combining_class_byname (const char *CCC_NAME) Returns the canonical combining class given by name, e.g. ‘"BL"’, or by long name, e.g. ‘"Below Left"’. This lookup ignores spaces, underscores, or hyphens as word separators and is case-insignificant. The following function looks up the canonical combining class of a character. -- Function: int uc_combining_class (ucs4_t UC) Returns the canonical combining class of a Unicode character. 8.3 Bidi class ============== Every Unicode character or code point has a _bidi class_ assigned to it. Before Unicode 4.0, this concept was known as _bidirectional category_. The bidi class guides the bidirectional algorithm (). The possible values are the following. -- Constant: int UC_BIDI_L The bidi class for ‘Left-to-Right‘” characters. -- Constant: int UC_BIDI_LRE The bidi class for “Left-to-Right Embedding” characters. -- Constant: int UC_BIDI_LRO The bidi class for “Left-to-Right Override” characters. -- Constant: int UC_BIDI_R The bidi class for “Right-to-Left” characters. -- Constant: int UC_BIDI_AL The bidi class for “Right-to-Left Arabic” characters. -- Constant: int UC_BIDI_RLE The bidi class for “Right-to-Left Embedding” characters. -- Constant: int UC_BIDI_RLO The bidi class for “Right-to-Left Override” characters. -- Constant: int UC_BIDI_PDF The bidi class for “Pop Directional Format” characters. -- Constant: int UC_BIDI_EN The bidi class for “European Number” characters. -- Constant: int UC_BIDI_ES The bidi class for “European Number Separator” characters. -- Constant: int UC_BIDI_ET The bidi class for “European Number Terminator” characters. -- Constant: int UC_BIDI_AN The bidi class for “Arabic Number” characters. -- Constant: int UC_BIDI_CS The bidi class for “Common Number Separator” characters. -- Constant: int UC_BIDI_NSM The bidi class for “Non-Spacing Mark” characters. -- Constant: int UC_BIDI_BN The bidi class for “Boundary Neutral” characters. -- Constant: int UC_BIDI_B The bidi class for “Paragraph Separator” characters. -- Constant: int UC_BIDI_S The bidi class for “Segment Separator” characters. -- Constant: int UC_BIDI_WS The bidi class for “Whitespace” characters. -- Constant: int UC_BIDI_ON The bidi class for “Other Neutral” characters. -- Constant: int UC_BIDI_LRI The bidi class for “Left-to-Right Isolate” characters. -- Constant: int UC_BIDI_RLI The bidi class for “Right-to-Left Isolate” characters. -- Constant: int UC_BIDI_FSI The bidi class for “First Strong Isolate” characters. -- Constant: int UC_BIDI_PDI The bidi class for “Pop Directional Isolate” characters. The following functions implement the association between a bidirectional category and its name. -- Function: const char * uc_bidi_class_name (int BIDI_CLASS) -- Function: const char * uc_bidi_category_name (int CATEGORY) Returns the name of a bidi class, more precisely, the abbreviated name. -- Function: const char * uc_bidi_class_long_name (int BIDI_CLASS) Returns the long name of a bidi class. -- Function: int uc_bidi_class_byname (const char *BIDI_CLASS_NAME) -- Function: int uc_bidi_category_byname (const char *CATEGORY_NAME) Returns the bidi class given by name, e.g. ‘"LRE"’, or by long name, e.g. ‘"Left-to-Right Embedding"’. This lookup ignores spaces, underscores, or hyphens as word separators and is case-insignificant. The following functions view bidirectional categories as sets of Unicode characters. -- Function: int uc_bidi_class (ucs4_t UC) -- Function: int uc_bidi_category (ucs4_t UC) Returns the bidi class of a Unicode character. -- Function: bool uc_is_bidi_class (ucs4_t UC, int BIDI_CLASS) -- Function: bool uc_is_bidi_category (ucs4_t UC, int CATEGORY) Tests whether a Unicode character belongs to a given bidi class. 8.4 Decimal digit value ======================= Decimal digits (like the digits from ‘0’ to ‘9’) exist in many scripts. The following function converts a decimal digit character to its numerical value. -- Function: int uc_decimal_value (ucs4_t UC) Returns the decimal digit value of a Unicode character. The return value is an integer in the range 0..9, or -1 for characters that do not represent a decimal digit. 8.5 Digit value =============== Digit characters are like decimal digit characters, possibly in special forms, like as superscript, subscript, or circled. The following function converts a digit character to its numerical value. -- Function: int uc_digit_value (ucs4_t UC) Returns the digit value of a Unicode character. The return value is an integer in the range 0..9, or -1 for characters that do not represent a digit. 8.6 Numeric value ================= There are also characters that represent numbers without a digit system, like the Roman numerals, and fractional numbers, like 1/4 or 3/4. The following type represents the numeric value of a Unicode character. -- Type: uc_fraction_t This is a structure type with the following fields: int numerator; int denominator; An integer N is represented by ‘numerator = N’, ‘denominator = 1’. The following function converts a number character to its numerical value. -- Function: uc_fraction_t uc_numeric_value (ucs4_t UC) Returns the numeric value of a Unicode character. The return value is a fraction, or the pseudo-fraction ‘{ 0, 0 }’ for characters that do not represent a number. 8.7 Mirrored character ====================== Character mirroring is used to associate the closing parenthesis character to the opening parenthesis character, the closing brace character with the opening brace character, and so on. The following function looks up the mirrored character of a Unicode character. -- Function: bool uc_mirror_char (ucs4_t UC, ucs4_t *PUC) Stores the mirrored character of a Unicode character UC in ‘*PUC’ and returns ‘true’, if it exists. Otherwise it stores UC unmodified in ‘*PUC’ and returns ‘false’. Note: It is possible for this function to return ‘true’ and set ‘*PUC’ to ‘0xFFFD’. This happens when the character has the bidi mirror property (that is, it should be displayed through a mirrored glyph) but this mirrored glyph does not exist as a Unicode character; thus a rendering engine needs to synthesize it artificially or pick it from an appropriate font. This affects mostly mathematical operators. See section “Bidi Mirrored” of the Unicode standard. 8.8 Arabic shaping ================== When Arabic characters are rendered, after bidi reordering has taken place, the shape of the glyphs are modified so that many adjacent glyphs are joined. Two character properties describe how this “Arabic shaping” takes place: the joining type and the joining group. 8.8.1 Joining type of Arabic characters --------------------------------------- The joining type of a character describes on which of the left and right neighbour characters the character’s shape depends, and which of the two neighbour characters are rendered depending on this character. The joining type has the following possible values: -- Constant: int UC_JOINING_TYPE_U “Non joining”: Characters of this joining type prohibit joining. -- Constant: int UC_JOINING_TYPE_T “Transparent”: Characters of this joining type are skipped when considering joining. -- Constant: int UC_JOINING_TYPE_C “Join causing”: Characters of this joining type cause their neighbour characters to change their shapes but don’t change their own shape. -- Constant: int UC_JOINING_TYPE_L “Left joining”: Characters of this joining type have two shapes, isolated and initial. Such characters currently don’t exist. -- Constant: int UC_JOINING_TYPE_R “Right joining”: Characters of this joining type have two shapes, isolated and final. -- Constant: int UC_JOINING_TYPE_D “Dual joining”: Characters of this joining type have four shapes, initial, medial, final, and isolated. The following functions implement the association between a joining type and its name. -- Function: const char * uc_joining_type_name (int JOINING_TYPE) Returns the name of a joining type. -- Function: const char * uc_joining_type_long_name (int JOINING_TYPE) Returns the long name of a joining type. -- Function: int uc_joining_type_byname (const char *JOINING_TYPE_NAME) Returns the joining type given by name, e.g. ‘"D"’, or by long name, e.g. ‘"Dual Joining’. This lookup ignores spaces, underscores, or hyphens as word separators and is case-insignificant. The following function gives the joining type of every Unicode character. -- Function: int uc_joining_type (ucs4_t UC) Returns the joining type of a Unicode character. 8.8.2 Joining group of Arabic characters ---------------------------------------- The joining group of a character describes how the character’s shape is modified in the four contexts of dual-joining characters or in the two contexts of right-joining characters. The joining group has the following possible values: -- Constant: int UC_JOINING_GROUP_NONE -- Constant: int UC_JOINING_GROUP_AIN -- Constant: int UC_JOINING_GROUP_ALAPH -- Constant: int UC_JOINING_GROUP_ALEF -- Constant: int UC_JOINING_GROUP_BEH -- Constant: int UC_JOINING_GROUP_BETH -- Constant: int UC_JOINING_GROUP_BURUSHASKI_YEH_BARREE -- Constant: int UC_JOINING_GROUP_DAL -- Constant: int UC_JOINING_GROUP_DALATH_RISH -- Constant: int UC_JOINING_GROUP_E -- Constant: int UC_JOINING_GROUP_FARSI_YEH -- Constant: int UC_JOINING_GROUP_FE -- Constant: int UC_JOINING_GROUP_FEH -- Constant: int UC_JOINING_GROUP_FINAL_SEMKATH -- Constant: int UC_JOINING_GROUP_GAF -- Constant: int UC_JOINING_GROUP_GAMAL -- Constant: int UC_JOINING_GROUP_HAH -- Constant: int UC_JOINING_GROUP_HE -- Constant: int UC_JOINING_GROUP_HEH -- Constant: int UC_JOINING_GROUP_HEH_GOAL -- Constant: int UC_JOINING_GROUP_HETH -- Constant: int UC_JOINING_GROUP_KAF -- Constant: int UC_JOINING_GROUP_KAPH -- Constant: int UC_JOINING_GROUP_KHAPH -- Constant: int UC_JOINING_GROUP_KNOTTED_HEH -- Constant: int UC_JOINING_GROUP_LAM -- Constant: int UC_JOINING_GROUP_LAMADH -- Constant: int UC_JOINING_GROUP_MEEM -- Constant: int UC_JOINING_GROUP_MIM -- Constant: int UC_JOINING_GROUP_NOON -- Constant: int UC_JOINING_GROUP_NUN -- Constant: int UC_JOINING_GROUP_NYA -- Constant: int UC_JOINING_GROUP_PE -- Constant: int UC_JOINING_GROUP_QAF -- Constant: int UC_JOINING_GROUP_QAPH -- Constant: int UC_JOINING_GROUP_REH -- Constant: int UC_JOINING_GROUP_REVERSED_PE -- Constant: int UC_JOINING_GROUP_SAD -- Constant: int UC_JOINING_GROUP_SADHE -- Constant: int UC_JOINING_GROUP_SEEN -- Constant: int UC_JOINING_GROUP_SEMKATH -- Constant: int UC_JOINING_GROUP_SHIN -- Constant: int UC_JOINING_GROUP_SWASH_KAF -- Constant: int UC_JOINING_GROUP_SYRIAC_WAW -- Constant: int UC_JOINING_GROUP_TAH -- Constant: int UC_JOINING_GROUP_TAW -- Constant: int UC_JOINING_GROUP_TEH_MARBUTA -- Constant: int UC_JOINING_GROUP_TEH_MARBUTA_GOAL -- Constant: int UC_JOINING_GROUP_TETH -- Constant: int UC_JOINING_GROUP_WAW -- Constant: int UC_JOINING_GROUP_YEH -- Constant: int UC_JOINING_GROUP_YEH_BARREE -- Constant: int UC_JOINING_GROUP_YEH_WITH_TAIL -- Constant: int UC_JOINING_GROUP_YUDH -- Constant: int UC_JOINING_GROUP_YUDH_HE -- Constant: int UC_JOINING_GROUP_ZAIN -- Constant: int UC_JOINING_GROUP_ZHAIN -- Constant: int UC_JOINING_GROUP_ROHINGYA_YEH -- Constant: int UC_JOINING_GROUP_STRAIGHT_WAW -- Constant: int UC_JOINING_GROUP_MANICHAEAN_ALEPH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_BETH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_GIMEL -- Constant: int UC_JOINING_GROUP_MANICHAEAN_DALETH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_WAW -- Constant: int UC_JOINING_GROUP_MANICHAEAN_ZAYIN -- Constant: int UC_JOINING_GROUP_MANICHAEAN_HETH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_TETH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_YODH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_KAPH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_LAMEDH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_DHAMEDH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_THAMEDH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_MEM -- Constant: int UC_JOINING_GROUP_MANICHAEAN_NUN -- Constant: int UC_JOINING_GROUP_MANICHAEAN_SAMEKH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_AYIN -- Constant: int UC_JOINING_GROUP_MANICHAEAN_PE -- Constant: int UC_JOINING_GROUP_MANICHAEAN_SADHE -- Constant: int UC_JOINING_GROUP_MANICHAEAN_QOPH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_RESH -- Constant: int UC_JOINING_GROUP_MANICHAEAN_TAW -- Constant: int UC_JOINING_GROUP_MANICHAEAN_ONE -- Constant: int UC_JOINING_GROUP_MANICHAEAN_FIVE -- Constant: int UC_JOINING_GROUP_MANICHAEAN_TEN -- Constant: int UC_JOINING_GROUP_MANICHAEAN_TWENTY -- Constant: int UC_JOINING_GROUP_MANICHAEAN_HUNDRED -- Constant: int UC_JOINING_GROUP_AFRICAN_FEH -- Constant: int UC_JOINING_GROUP_AFRICAN_QAF -- Constant: int UC_JOINING_GROUP_AFRICAN_NOON -- Constant: int UC_JOINING_GROUP_MALAYALAM_NGA -- Constant: int UC_JOINING_GROUP_MALAYALAM_JA -- Constant: int UC_JOINING_GROUP_MALAYALAM_NYA -- Constant: int UC_JOINING_GROUP_MALAYALAM_TTA -- Constant: int UC_JOINING_GROUP_MALAYALAM_NNA -- Constant: int UC_JOINING_GROUP_MALAYALAM_NNNA -- Constant: int UC_JOINING_GROUP_MALAYALAM_BHA -- Constant: int UC_JOINING_GROUP_MALAYALAM_RA -- Constant: int UC_JOINING_GROUP_MALAYALAM_LLA -- Constant: int UC_JOINING_GROUP_MALAYALAM_LLLA -- Constant: int UC_JOINING_GROUP_MALAYALAM_SSA -- Constant: int UC_JOINING_GROUP_HANIFI_ROHINGYA_PA -- Constant: int UC_JOINING_GROUP_HANIFI_ROHINGYA_KINNA_YA -- Constant: int UC_JOINING_GROUP_THIN_YEH -- Constant: int UC_JOINING_GROUP_VERTICAL_TAIL -- Constant: int UC_JOINING_GROUP_KASHMIRI_YEH The following functions implement the association between a joining group and its name. -- Function: const char * uc_joining_group_name (int JOINING_GROUP) Returns the name of a joining group. -- Function: int uc_joining_group_byname (const char *JOINING_GROUP_NAME) Returns the joining group given by name, e.g. ‘"Teh_Marbuta"’. This lookup ignores spaces, underscores, or hyphens as word separators and is case-insignificant. The following function gives the joining group of every Unicode character. -- Function: int uc_joining_group (ucs4_t UC) Returns the joining group of a Unicode character. 8.9 Properties ============== This section defines boolean properties of Unicode characters. This means, a character either has the given property or does not have it. In other words, the property can be viewed as a subset of the set of Unicode characters. The GNU libunistring library provides two kinds of API for working with properties. The object oriented API uses a type ‘uc_property_t’ to designate a property. In the function-based API, which is a bit more low level, a property is merely a function. 8.9.1 Properties as objects – the object oriented API ----------------------------------------------------- The following type designates a property on Unicode characters. -- Type: uc_property_t This data type denotes a boolean property on Unicode characters. It is an immediate type that can be copied by simple assignment, without involving memory allocation. It is not an array type. Many Unicode properties are predefined. The following are general properties. -- Constant: uc_property_t UC_PROPERTY_WHITE_SPACE -- Constant: uc_property_t UC_PROPERTY_ALPHABETIC -- Constant: uc_property_t UC_PROPERTY_OTHER_ALPHABETIC -- Constant: uc_property_t UC_PROPERTY_NOT_A_CHARACTER -- Constant: uc_property_t UC_PROPERTY_DEFAULT_IGNORABLE_CODE_POINT -- Constant: uc_property_t UC_PROPERTY_OTHER_DEFAULT_IGNORABLE_CODE_POINT -- Constant: uc_property_t UC_PROPERTY_DEPRECATED -- Constant: uc_property_t UC_PROPERTY_LOGICAL_ORDER_EXCEPTION -- Constant: uc_property_t UC_PROPERTY_VARIATION_SELECTOR -- Constant: uc_property_t UC_PROPERTY_PRIVATE_USE -- Constant: uc_property_t UC_PROPERTY_UNASSIGNED_CODE_VALUE The following properties are related to case folding. -- Constant: uc_property_t UC_PROPERTY_UPPERCASE -- Constant: uc_property_t UC_PROPERTY_OTHER_UPPERCASE -- Constant: uc_property_t UC_PROPERTY_LOWERCASE -- Constant: uc_property_t UC_PROPERTY_OTHER_LOWERCASE -- Constant: uc_property_t UC_PROPERTY_TITLECASE -- Constant: uc_property_t UC_PROPERTY_CASED -- Constant: uc_property_t UC_PROPERTY_CASE_IGNORABLE -- Constant: uc_property_t UC_PROPERTY_CHANGES_WHEN_LOWERCASED -- Constant: uc_property_t UC_PROPERTY_CHANGES_WHEN_UPPERCASED -- Constant: uc_property_t UC_PROPERTY_CHANGES_WHEN_TITLECASED -- Constant: uc_property_t UC_PROPERTY_CHANGES_WHEN_CASEFOLDED -- Constant: uc_property_t UC_PROPERTY_CHANGES_WHEN_CASEMAPPED -- Constant: uc_property_t UC_PROPERTY_SOFT_DOTTED The following properties are related to identifiers. -- Constant: uc_property_t UC_PROPERTY_ID_START -- Constant: uc_property_t UC_PROPERTY_OTHER_ID_START -- Constant: uc_property_t UC_PROPERTY_ID_CONTINUE -- Constant: uc_property_t UC_PROPERTY_OTHER_ID_CONTINUE -- Constant: uc_property_t UC_PROPERTY_XID_START -- Constant: uc_property_t UC_PROPERTY_XID_CONTINUE -- Constant: uc_property_t UC_PROPERTY_ID_COMPAT_MATH_START -- Constant: uc_property_t UC_PROPERTY_ID_COMPAT_MATH_CONTINUE -- Constant: uc_property_t UC_PROPERTY_PATTERN_WHITE_SPACE -- Constant: uc_property_t UC_PROPERTY_PATTERN_SYNTAX The following properties have an influence on shaping and rendering. -- Constant: uc_property_t UC_PROPERTY_JOIN_CONTROL -- Constant: uc_property_t UC_PROPERTY_GRAPHEME_BASE -- Constant: uc_property_t UC_PROPERTY_GRAPHEME_EXTEND -- Constant: uc_property_t UC_PROPERTY_OTHER_GRAPHEME_EXTEND -- Constant: uc_property_t UC_PROPERTY_GRAPHEME_LINK -- Constant: uc_property_t UC_PROPERTY_MODIFIER_COMBINING_MARK The following properties relate to bidirectional reordering. -- Constant: uc_property_t UC_PROPERTY_BIDI_CONTROL -- Constant: uc_property_t UC_PROPERTY_BIDI_LEFT_TO_RIGHT -- Constant: uc_property_t UC_PROPERTY_BIDI_HEBREW_RIGHT_TO_LEFT -- Constant: uc_property_t UC_PROPERTY_BIDI_ARABIC_RIGHT_TO_LEFT -- Constant: uc_property_t UC_PROPERTY_BIDI_EUROPEAN_DIGIT -- Constant: uc_property_t UC_PROPERTY_BIDI_EUR_NUM_SEPARATOR -- Constant: uc_property_t UC_PROPERTY_BIDI_EUR_NUM_TERMINATOR -- Constant: uc_property_t UC_PROPERTY_BIDI_ARABIC_DIGIT -- Constant: uc_property_t UC_PROPERTY_BIDI_COMMON_SEPARATOR -- Constant: uc_property_t UC_PROPERTY_BIDI_BLOCK_SEPARATOR -- Constant: uc_property_t UC_PROPERTY_BIDI_SEGMENT_SEPARATOR -- Constant: uc_property_t UC_PROPERTY_BIDI_WHITESPACE -- Constant: uc_property_t UC_PROPERTY_BIDI_NON_SPACING_MARK -- Constant: uc_property_t UC_PROPERTY_BIDI_BOUNDARY_NEUTRAL -- Constant: uc_property_t UC_PROPERTY_BIDI_PDF -- Constant: uc_property_t UC_PROPERTY_BIDI_EMBEDDING_OR_OVERRIDE -- Constant: uc_property_t UC_PROPERTY_BIDI_OTHER_NEUTRAL The following properties deal with number representations. -- Constant: uc_property_t UC_PROPERTY_HEX_DIGIT -- Constant: uc_property_t UC_PROPERTY_ASCII_HEX_DIGIT The following properties deal with CJK. -- Constant: uc_property_t UC_PROPERTY_IDEOGRAPHIC -- Constant: uc_property_t UC_PROPERTY_UNIFIED_IDEOGRAPH -- Constant: uc_property_t UC_PROPERTY_RADICAL -- Constant: uc_property_t UC_PROPERTY_IDS_UNARY_OPERATOR -- Constant: uc_property_t UC_PROPERTY_IDS_BINARY_OPERATOR -- Constant: uc_property_t UC_PROPERTY_IDS_TRINARY_OPERATOR The following properties deal with pictographic symbols. -- Constant: uc_property_t UC_PROPERTY_EMOJI -- Constant: uc_property_t UC_PROPERTY_EMOJI_PRESENTATION -- Constant: uc_property_t UC_PROPERTY_EMOJI_MODIFIER -- Constant: uc_property_t UC_PROPERTY_EMOJI_MODIFIER_BASE -- Constant: uc_property_t UC_PROPERTY_EMOJI_COMPONENT -- Constant: uc_property_t UC_PROPERTY_EXTENDED_PICTOGRAPHIC Other miscellaneous properties are: -- Constant: uc_property_t UC_PROPERTY_ZERO_WIDTH -- Constant: uc_property_t UC_PROPERTY_SPACE -- Constant: uc_property_t UC_PROPERTY_NON_BREAK -- Constant: uc_property_t UC_PROPERTY_ISO_CONTROL -- Constant: uc_property_t UC_PROPERTY_FORMAT_CONTROL -- Constant: uc_property_t UC_PROPERTY_PREPENDED_CONCATENATION_MARK -- Constant: uc_property_t UC_PROPERTY_DASH -- Constant: uc_property_t UC_PROPERTY_HYPHEN -- Constant: uc_property_t UC_PROPERTY_PUNCTUATION -- Constant: uc_property_t UC_PROPERTY_LINE_SEPARATOR -- Constant: uc_property_t UC_PROPERTY_PARAGRAPH_SEPARATOR -- Constant: uc_property_t UC_PROPERTY_QUOTATION_MARK -- Constant: uc_property_t UC_PROPERTY_SENTENCE_TERMINAL -- Constant: uc_property_t UC_PROPERTY_TERMINAL_PUNCTUATION -- Constant: uc_property_t UC_PROPERTY_CURRENCY_SYMBOL -- Constant: uc_property_t UC_PROPERTY_MATH -- Constant: uc_property_t UC_PROPERTY_OTHER_MATH -- Constant: uc_property_t UC_PROPERTY_PAIRED_PUNCTUATION -- Constant: uc_property_t UC_PROPERTY_LEFT_OF_PAIR -- Constant: uc_property_t UC_PROPERTY_COMBINING -- Constant: uc_property_t UC_PROPERTY_COMPOSITE -- Constant: uc_property_t UC_PROPERTY_DECIMAL_DIGIT -- Constant: uc_property_t UC_PROPERTY_NUMERIC -- Constant: uc_property_t UC_PROPERTY_DIACRITIC -- Constant: uc_property_t UC_PROPERTY_EXTENDER -- Constant: uc_property_t UC_PROPERTY_IGNORABLE_CONTROL -- Constant: uc_property_t UC_PROPERTY_REGIONAL_INDICATOR The following function looks up a property by its name. -- Function: uc_property_t uc_property_byname (const char *PROPERTY_NAME) Returns the property given by name, e.g. ‘"White space"’. If a property with the given name exists, the result will satisfy the ‘uc_property_is_valid’ predicate. Otherwise the result will not satisfy this predicate and must not be passed to functions that expect an ‘uc_property_t’ argument. This lookup ignores spaces, underscores, or hyphens as word separators, is case-insignificant, and supports the aliases listed in Unicode’s ‘PropertyAliases.txt’ file. This function references a big table of all predefined properties. Its use can significantly increase the size of your application. -- Function: bool uc_property_is_valid (uc_property_t property) Returns ‘true’ when the given property is valid, or ‘false’ otherwise. The following function views a property as a set of Unicode characters. -- Function: bool uc_is_property (ucs4_t UC, uc_property_t PROPERTY) Tests whether the Unicode character UC has the given property. 8.9.2 Properties as functions – the functional API -------------------------------------------------- The following are general properties. -- Function: bool uc_is_property_white_space (ucs4_t UC) -- Function: bool uc_is_property_alphabetic (ucs4_t UC) -- Function: bool uc_is_property_other_alphabetic (ucs4_t UC) -- Function: bool uc_is_property_not_a_character (ucs4_t UC) -- Function: bool uc_is_property_default_ignorable_code_point (ucs4_t UC) -- Function: bool uc_is_property_other_default_ignorable_code_point (ucs4_t UC) -- Function: bool uc_is_property_deprecated (ucs4_t UC) -- Function: bool uc_is_property_logical_order_exception (ucs4_t UC) -- Function: bool uc_is_property_variation_selector (ucs4_t UC) -- Function: bool uc_is_property_private_use (ucs4_t UC) -- Function: bool uc_is_property_unassigned_code_value (ucs4_t UC) The following properties are related to case folding. -- Function: bool uc_is_property_uppercase (ucs4_t UC) -- Function: bool uc_is_property_other_uppercase (ucs4_t UC) -- Function: bool uc_is_property_lowercase (ucs4_t UC) -- Function: bool uc_is_property_other_lowercase (ucs4_t UC) -- Function: bool uc_is_property_titlecase (ucs4_t UC) -- Function: bool uc_is_property_cased (ucs4_t UC) -- Function: bool uc_is_property_case_ignorable (ucs4_t UC) -- Function: bool uc_is_property_changes_when_lowercased (ucs4_t UC) -- Function: bool uc_is_property_changes_when_uppercased (ucs4_t UC) -- Function: bool uc_is_property_changes_when_titlecased (ucs4_t UC) -- Function: bool uc_is_property_changes_when_casefolded (ucs4_t UC) -- Function: bool uc_is_property_changes_when_casemapped (ucs4_t UC) -- Function: bool uc_is_property_soft_dotted (ucs4_t UC) The following properties are related to identifiers. -- Function: bool uc_is_property_id_start (ucs4_t UC) -- Function: bool uc_is_property_other_id_start (ucs4_t UC) -- Function: bool uc_is_property_id_continue (ucs4_t UC) -- Function: bool uc_is_property_other_id_continue (ucs4_t UC) -- Function: bool uc_is_property_xid_start (ucs4_t UC) -- Function: bool uc_is_property_xid_continue (ucs4_t UC) -- Function: bool uc_is_property_id_compat_math_start (ucs4_t UC) -- Function: bool uc_is_property_id_compat_math_continue (ucs4_t UC) -- Function: bool uc_is_property_pattern_white_space (ucs4_t UC) -- Function: bool uc_is_property_pattern_syntax (ucs4_t UC) The following properties have an influence on shaping and rendering. -- Function: bool uc_is_property_join_control (ucs4_t UC) -- Function: bool uc_is_property_grapheme_base (ucs4_t UC) -- Function: bool uc_is_property_grapheme_extend (ucs4_t UC) -- Function: bool uc_is_property_other_grapheme_extend (ucs4_t UC) -- Function: bool uc_is_property_grapheme_link (ucs4_t UC) -- Function: bool uc_is_property_modifier_combining_mark (ucs4_t UC) The following properties relate to bidirectional reordering. -- Function: bool uc_is_property_bidi_control (ucs4_t UC) -- Function: bool uc_is_property_bidi_left_to_right (ucs4_t UC) -- Function: bool uc_is_property_bidi_hebrew_right_to_left (ucs4_t UC) -- Function: bool uc_is_property_bidi_arabic_right_to_left (ucs4_t UC) -- Function: bool uc_is_property_bidi_european_digit (ucs4_t UC) -- Function: bool uc_is_property_bidi_eur_num_separator (ucs4_t UC) -- Function: bool uc_is_property_bidi_eur_num_terminator (ucs4_t UC) -- Function: bool uc_is_property_bidi_arabic_digit (ucs4_t UC) -- Function: bool uc_is_property_bidi_common_separator (ucs4_t UC) -- Function: bool uc_is_property_bidi_block_separator (ucs4_t UC) -- Function: bool uc_is_property_bidi_segment_separator (ucs4_t UC) -- Function: bool uc_is_property_bidi_whitespace (ucs4_t UC) -- Function: bool uc_is_property_bidi_non_spacing_mark (ucs4_t UC) -- Function: bool uc_is_property_bidi_boundary_neutral (ucs4_t UC) -- Function: bool uc_is_property_bidi_pdf (ucs4_t UC) -- Function: bool uc_is_property_bidi_embedding_or_override (ucs4_t UC) -- Function: bool uc_is_property_bidi_other_neutral (ucs4_t UC) The following properties deal with number representations. -- Function: bool uc_is_property_hex_digit (ucs4_t UC) -- Function: bool uc_is_property_ascii_hex_digit (ucs4_t UC) The following properties deal with CJK. -- Function: bool uc_is_property_ideographic (ucs4_t UC) -- Function: bool uc_is_property_unified_ideograph (ucs4_t UC) -- Function: bool uc_is_property_radical (ucs4_t UC) -- Function: bool uc_is_property_ids_unary_operator (ucs4_t UC) -- Function: bool uc_is_property_ids_binary_operator (ucs4_t UC) -- Function: bool uc_is_property_ids_trinary_operator (ucs4_t UC) The following properties deal with pictographic symbols. -- Function: bool uc_is_property_emoji (ucs4_t UC) -- Function: bool uc_is_property_emoji_presentation (ucs4_t UC) -- Function: bool uc_is_property_emoji_modifier (ucs4_t UC) -- Function: bool uc_is_property_emoji_modifier_base (ucs4_t UC) -- Function: bool uc_is_property_emoji_component (ucs4_t UC) -- Function: bool uc_is_property_extended_pictographic (ucs4_t UC) Other miscellaneous properties are: -- Function: bool uc_is_property_zero_width (ucs4_t UC) -- Function: bool uc_is_property_space (ucs4_t UC) -- Function: bool uc_is_property_non_break (ucs4_t UC) -- Function: bool uc_is_property_iso_control (ucs4_t UC) -- Function: bool uc_is_property_format_control (ucs4_t UC) -- Function: bool uc_is_property_prepended_concatenation_mark (ucs4_t UC) -- Function: bool uc_is_property_dash (ucs4_t UC) -- Function: bool uc_is_property_hyphen (ucs4_t UC) -- Function: bool uc_is_property_punctuation (ucs4_t UC) -- Function: bool uc_is_property_line_separator (ucs4_t UC) -- Function: bool uc_is_property_paragraph_separator (ucs4_t UC) -- Function: bool uc_is_property_quotation_mark (ucs4_t UC) -- Function: bool uc_is_property_sentence_terminal (ucs4_t UC) -- Function: bool uc_is_property_terminal_punctuation (ucs4_t UC) -- Function: bool uc_is_property_currency_symbol (ucs4_t UC) -- Function: bool uc_is_property_math (ucs4_t UC) -- Function: bool uc_is_property_other_math (ucs4_t UC) -- Function: bool uc_is_property_paired_punctuation (ucs4_t UC) -- Function: bool uc_is_property_left_of_pair (ucs4_t UC) -- Function: bool uc_is_property_combining (ucs4_t UC) -- Function: bool uc_is_property_composite (ucs4_t UC) -- Function: bool uc_is_property_decimal_digit (ucs4_t UC) -- Function: bool uc_is_property_numeric (ucs4_t UC) -- Function: bool uc_is_property_diacritic (ucs4_t UC) -- Function: bool uc_is_property_extender (ucs4_t UC) -- Function: bool uc_is_property_ignorable_control (ucs4_t UC) -- Function: bool uc_is_property_regional_indicator (ucs4_t UC) 8.10 Other attributes ===================== This section defines non-boolean attributes of Unicode characters. 8.10.1 Indic conjunct break --------------------------- The Indic_Conjunct_Break attribute is used when determining the grapheme cluster boundary in Indic scripts. The Indic_Conjunct_Break attribute has the following possible values: -- Constant: int UC_INDIC_CONJUNCT_BREAK_NONE -- Constant: int UC_INDIC_CONJUNCT_BREAK_CONSONANT -- Constant: int UC_INDIC_CONJUNCT_BREAK_LINKER -- Constant: int UC_INDIC_CONJUNCT_BREAK_EXTEND The following functions implement the association between an Indic_Conjunct_Break value and its name. -- Function: const char * uc_indic_conjunct_break_name (int INDIC_CONJUNCT_BREAK) Returns the name of an Indic_Conjunct_Break value. -- Function: int uc_indic_conjunct_break_byname (const char *INDIC_CONJUNCT_BREAK_NAME) Returns the Indic_Conjunct_Break value given by name, e.g. ‘"Consonant"’. This lookup ignores spaces, underscores, or hyphens as word separators and is case-insignificant. The following function gives the Indic_Conjunct_Break attribute of every Unicode character. -- Function: int uc_indic_conjunct_break (ucs4_t UC) Returns the Indic_Conjunct_Break attribute of a Unicode character. 8.11 Scripts ============ The Unicode characters are subdivided into scripts. The following type is used to represent a script: -- Type: uc_script_t This data type is a structure type that refers to statically allocated read-only data. It contains the following fields: const char *name; The ‘name’ field contains the name of the script. The following functions look up a script. -- Function: const uc_script_t * uc_script (ucs4_t UC) Returns the script of a Unicode character. Returns NULL if UC does not belong to any script. -- Function: const uc_script_t * uc_script_byname (const char *SCRIPT_NAME) Returns the script given by its name, e.g. ‘"HAN"’. Returns NULL if a script with the given name does not exist. The following function views a script as a set of Unicode characters. -- Function: bool uc_is_script (ucs4_t UC, const uc_script_t *SCRIPT) Tests whether a Unicode character belongs to a given script. The following gives a global picture of all scripts. -- Function: void uc_all_scripts (const uc_script_t **SCRIPTS, size_t *COUNT) Get the list of all scripts. Stores a pointer to an array of all scripts in ‘*SCRIPTS’ and the length of this array in ‘*COUNT’. 8.12 Blocks =========== The Unicode characters are subdivided into blocks. A block is an interval of Unicode code points. The following type is used to represent a block. -- Type: uc_block_t This data type is a structure type that refers to statically allocated data. It contains the following fields: ucs4_t start; ucs4_t end; const char *name; The ‘start’ field is the first Unicode code point in the block. The ‘end’ field is the last Unicode code point in the block. The ‘name’ field is the name of the block. The following function looks up a block. -- Function: const uc_block_t * uc_block (ucs4_t UC) Returns the block a character belongs to. The following function views a block as a set of Unicode characters. -- Function: bool uc_is_block (ucs4_t UC, const uc_block_t *BLOCK) Tests whether a Unicode character belongs to a given block. The following gives a global picture of all block. -- Function: void uc_all_blocks (const uc_block_t **BLOCKS, size_t *COUNT) Get the list of all blocks. Stores a pointer to an array of all blocks in ‘*BLOCKS’ and the length of this array in ‘*COUNT’. 8.13 ISO C and Java syntax ========================== The following properties are taken from language standards. The supported language standards are ISO C 99 and Java. -- Function: bool uc_is_c_whitespace (ucs4_t UC) Tests whether a Unicode character is considered whitespace in ISO C 99. -- Function: bool uc_is_java_whitespace (ucs4_t UC) Tests whether a Unicode character is considered whitespace in Java. The following enumerated values are the possible return values of the functions ‘uc_c_ident_category’ and ‘uc_java_ident_category’. -- Constant: int UC_IDENTIFIER_START This return value means that the given character is valid as first or subsequent character in an identifier. -- Constant: int UC_IDENTIFIER_VALID This return value means that the given character is valid as subsequent character only. -- Constant: int UC_IDENTIFIER_INVALID This return value means that the given character is not valid in an identifier. -- Constant: int UC_IDENTIFIER_IGNORABLE This return value (only for Java) means that the given character is ignorable. The following function determine whether a given character can be a constituent of an identifier in the given programming language. -- Function: int uc_c_ident_category (ucs4_t UC) Returns the categorization of a Unicode character with respect to the ISO C 99 identifier syntax. -- Function: int uc_java_ident_category (ucs4_t UC) Returns the categorization of a Unicode character with respect to the Java identifier syntax. 8.14 Classifications like in ISO C ================================== The following character classifications mimic those declared in the ISO C header files ‘’ and ‘’. These functions are deprecated, because this set of functions was designed with ASCII in mind and cannot reflect the more diverse reality of the Unicode character set. But they can be a quick-and-dirty porting aid when migrating from ‘wchar_t’ APIs to Unicode strings. -- Function: bool uc_is_alnum (ucs4_t UC) Tests for any character for which ‘uc_is_alpha’ or ‘uc_is_digit’ is true. -- Function: bool uc_is_alpha (ucs4_t UC) Tests for any character for which ‘uc_is_upper’ or ‘uc_is_lower’ is true, or any character that is one of a locale-specific set of characters for which none of ‘uc_is_cntrl’, ‘uc_is_digit’, ‘uc_is_punct’, or ‘uc_is_space’ is true. -- Function: bool uc_is_cntrl (ucs4_t UC) Tests for any control character. -- Function: bool uc_is_digit (ucs4_t UC) Tests for any character that corresponds to a decimal-digit character. -- Function: bool uc_is_graph (ucs4_t UC) Tests for any character for which ‘uc_is_print’ is true and ‘uc_is_space’ is false. -- Function: bool uc_is_lower (ucs4_t UC) Tests for any character that corresponds to a lowercase letter or is one of a locale-specific set of characters for which none of ‘uc_is_cntrl’, ‘uc_is_digit’, ‘uc_is_punct’, or ‘uc_is_space’ is true. -- Function: bool uc_is_print (ucs4_t UC) Tests for any printing character. -- Function: bool uc_is_punct (ucs4_t UC) Tests for any printing character that is one of a locale-specific set of characters for which neither ‘uc_is_space’ nor ‘uc_is_alnum’ is true. -- Function: bool uc_is_space (ucs4_t UC) Test for any character that corresponds to a locale-specific set of characters for which none of ‘uc_is_alnum’, ‘uc_is_graph’, or ‘uc_is_punct’ is true. -- Function: bool uc_is_upper (ucs4_t UC) Tests for any character that corresponds to an uppercase letter or is one of a locale-specific set of characters for which none of ‘uc_is_cntrl’, ‘uc_is_digit’, ‘uc_is_punct’, or ‘uc_is_space’ is true. -- Function: bool uc_is_xdigit (ucs4_t UC) Tests for any character that corresponds to a hexadecimal-digit character. -- Function: bool uc_is_blank (ucs4_t UC) Tests for any character that corresponds to a standard blank character or a locale-specific set of characters for which ‘uc_is_alnum’ is false. 9 Display width ‘’ ****************************** This include file declares functions that return the display width, measured in columns, of characters or strings, when output to a device that uses non-proportional fonts. Note that for some rarely used characters the actual fonts or terminal emulators can use a different width. There is no mechanism for communicating the display width of characters across a Unix pseudo-terminal (tty). Also, there are scripts with complex rendering, like the Indic scripts. For these scripts, there is no such concept as non-proportional fonts. Therefore the results of these functions usually work fine on most scripts and on most characters but can fail to represent the actual display width. These functions are locale dependent. The ENCODING argument identifies the encoding (e.g. ‘"ISO-8859-2"’ for Polish). -- Function: int uc_width (ucs4_t UC, const char *ENCODING) Determines and returns the number of column positions required for UC. Returns -1 if UC is a control character that has an influence on the column position when output. -- Function: int u8_width (const uint8_t *S, size_t N, const char *ENCODING) -- Function: int u16_width (const uint16_t *S, size_t N, const char *ENCODING) -- Function: int u32_width (const uint32_t *S, size_t N, const char *ENCODING) Determines and returns the number of column positions required for first N units (or fewer if S ends before this) in S. This function ignores control characters in the string. -- Function: int u8_strwidth (const uint8_t *S, const char *ENCODING) -- Function: int u16_strwidth (const uint16_t *S, const char *ENCODING) -- Function: int u32_strwidth (const uint32_t *S, const char *ENCODING) Determines and returns the number of column positions required for S. This function ignores control characters in the string. 10 Grapheme cluster breaks in strings ‘’ *************************************************** This include file declares functions for determining where in a string “grapheme clusters” start and end. A “grapheme cluster” is an approximation to a user-perceived character, which sometimes corresponds to multiple Unicode characters. Editing operations such as mouse selection, cursor movement, and backspacing often operate on grapheme clusters as units, not on individual characters. Some grapheme clusters are built from a base character and a combining character. The letter ‘é’, for example, is most commonly represented in Unicode as a single character U+00E8 LATIN SMALL LETTER E WITH ACUTE. It is, however, equally valid to use the pair of characters U+0065 LATIN SMALL LETTER E followed by U+0301 COMBINING ACUTE ACCENT. Since the user would perceive this pair of characters as a single character, they would be grouped into a single grapheme cluster. But there are also grapheme clusters that consist of several base characters. For example, a Devanagari letter and a Devanagari vowel sign that follows it may form a grapheme cluster. Similarly, some pairs of Thai characters and Hangul syllables (formed by two or three Hangul characters) are grapheme clusters. 10.1 Grapheme cluster breaks in a string ======================================== The following functions find a single boundary between grapheme clusters in a string. -- Function: void u8_grapheme_next (const uint8_t *S, const uint8_t *END) -- Function: void u16_grapheme_next (const uint16_t *S, const uint16_t *END) -- Function: void u32_grapheme_next (const uint32_t *S, const uint32_t *END) Returns the start of the next grapheme cluster following S, or END if no grapheme cluster break is encountered before it. Returns NULL if and only if ‘S == END’. Note that these functions do not handle the case when a character outside of the range between S and END is needed to determine the boundary. This is the case in particular with syllables in Indic scripts or emojis. Use ‘_grapheme_breaks’ functions for such cases. -- Function: void u8_grapheme_prev (const uint8_t *S, const uint8_t *START) -- Function: void u16_grapheme_prev (const uint16_t *S, const uint16_t *START) -- Function: void u32_grapheme_prev (const uint32_t *S, const uint32_t *START) Returns the start of the grapheme cluster preceding S, or START if no grapheme cluster break is encountered before it. Returns NULL if and only if ‘S == START’. Note that these functions do not handle the case when a character outside of the range between START and S is needed to determine the boundary. This is the case in particular with syllables in Indic scripts or emojis. Use ‘_grapheme_breaks’ functions for such cases. Note also that these functions work only on well-formed Unicode strings. The following functions determine all of the grapheme cluster boundaries in a string. -- Function: void u8_grapheme_breaks (const uint8_t *S, size_t N, char *P) -- Function: void u16_grapheme_breaks (const uint16_t *S, size_t N, char *P) -- Function: void u32_grapheme_breaks (const uint32_t *S, size_t N, char *P) -- Function: void ulc_grapheme_breaks (const char *S, size_t N, char *P) -- Function: void uc_grapheme_breaks (const ucs_t *S, size_t N, char *P) Determines the grapheme cluster break points in S, an array of N units, and stores the result at ‘P[0..NX-1]’. ‘P[i] = 1’ means that there is a grapheme cluster boundary between ‘S[i-1]’ and ‘S[i]’. ‘P[i] = 0’ means that ‘S[i-1]’ and ‘S[i]’ are part of the same grapheme cluster. ‘P[0]’ is always set to 1, because there is always a grapheme cluster break at start of text. In addition to the above variants for UTF-8, UTF-16, and UTF-32 strings, ‘’ provides another variant: ‘uc_grapheme_breaks’. This is similar to ‘u32_grapheme_breaks’, but it accepts any characters which may not be represented in UTF-32, such as control characters. 10.2 Grapheme cluster break property ==================================== This is a more low-level API. The grapheme cluster break property is a property defined in Unicode Standard Annex #29, section “Grapheme Cluster Boundaries”, see . It is used for determining the grapheme cluster breaks in a string. The following are the possible values of the grapheme cluster break property. More values may be added in the future. -- Constant: int GBP_OTHER -- Constant: int GBP_CR -- Constant: int GBP_LF -- Constant: int GBP_CONTROL -- Constant: int GBP_EXTEND -- Constant: int GBP_PREPEND -- Constant: int GBP_SPACINGMARK -- Constant: int GBP_L -- Constant: int GBP_V -- Constant: int GBP_T -- Constant: int GBP_LV -- Constant: int GBP_LVT -- Constant: int GBP_RI -- Constant: int GBP_ZWJ -- Constant: int GBP_EB -- Constant: int GBP_EM -- Constant: int GBP_GAZ -- Constant: int GBP_EBG The following function looks up the grapheme cluster break property of a character. -- Function: int uc_graphemeclusterbreak_property (ucs4_t UC) Returns the Grapheme_Cluster_Break property of a Unicode character. The following function determines whether there is a grapheme cluster break between two Unicode characters. It is the primitive upon which the higher-level functions in the previous section are directly based. -- Function: bool uc_is_grapheme_break (ucs4_t A, ucs4_t B) Returns true if there is an grapheme cluster boundary between Unicode characters A and B. There is always a grapheme cluster break at the start or end of text. You can specify zero for A or B to indicate start of text or end of text, respectively. This implements the extended (not legacy) grapheme cluster rules described in the Unicode standard, because the standard says that they are preferred. Note that this function does not handle the case when three or more consecutive characters are needed to determine the boundary. This is the case in particular with syllables in Indic scripts or emojis. Use ‘uc_grapheme_breaks’ for such cases. 11 Word breaks in strings ‘’ *************************************** This include file declares functions for determining where in a string “words” start and end. Here “words” are not necessarily the same as entities that can be looked up in dictionaries, but rather groups of consecutive characters that should not be split by text processing operations. 11.1 Word breaks in a string ============================ The following functions determine the word breaks in a string. -- Function: void u8_wordbreaks (const uint8_t *S, size_t N, char *P) -- Function: void u16_wordbreaks (const uint16_t *S, size_t N, char *P) -- Function: void u32_wordbreaks (const uint32_t *S, size_t N, char *P) -- Function: void ulc_wordbreaks (const char *S, size_t N, char *P) Determines the word break points in S, an array of N units, and stores the result at ‘P[0..N-1]’. ‘P[i] = 1’ means that there is a word boundary between ‘S[i-1]’ and ‘S[i]’. ‘P[i] = 0’ means that ‘S[i-1]’ and ‘S[i]’ must not be separated. ‘P[0]’ is always set to 0. If an application wants to consider a word break to be present at the beginning of the string (before ‘S[0]’) or at the end of the string (after ‘S[0..N-1]’), it has to treat these cases explicitly. 11.2 Word break property ======================== This is a more low-level API. The word break property is a property defined in Unicode Standard Annex #29, section “Word Boundaries”, see . It is used for determining the word breaks in a string. The following are the possible values of the word break property. More values may be added in the future. -- Constant: int WBP_OTHER -- Constant: int WBP_CR -- Constant: int WBP_LF -- Constant: int WBP_NEWLINE -- Constant: int WBP_EXTEND -- Constant: int WBP_FORMAT -- Constant: int WBP_KATAKANA -- Constant: int WBP_ALETTER -- Constant: int WBP_MIDNUMLET -- Constant: int WBP_MIDLETTER -- Constant: int WBP_MIDNUM -- Constant: int WBP_NUMERIC -- Constant: int WBP_EXTENDNUMLET -- Constant: int WBP_RI -- Constant: int WBP_DQ -- Constant: int WBP_SQ -- Constant: int WBP_HL -- Constant: int WBP_ZWJ -- Constant: int WBP_EB -- Constant: int WBP_EM -- Constant: int WBP_GAZ -- Constant: int WBP_EBG The following function looks up the word break property of a character. -- Function: int uc_wordbreak_property (ucs4_t UC) Returns the Word_Break property of a Unicode character. 12 Line breaking ‘’ ****************************** This include file declares functions for determining where in a string line breaks could or should be introduced, in order to make the displayed string fit into a column of given width. These functions are locale dependent. The ENCODING argument identifies the encoding (e.g. ‘"ISO-8859-2"’ for Polish). The following enumerated values indicate whether, at a given position, a line break is possible or not. Given an string S as an array ‘S[0..N-1]’ and a position I, the values have the following meanings: -- Constant: int UC_BREAK_MANDATORY This value indicates that ‘S[I]’ is a line break character. -- Constant: int UC_BREAK_CR_BEFORE_LF This value is a variant of ‘UC_BREAK_MANDATORY’. It indicates that ‘S[I]’ is a CR character and that ‘S[I+1]’ is a LF character. -- Constant: int UC_BREAK_POSSIBLE This value indicates that a line break may be inserted between ‘S[I-1]’ and ‘S[I]’. -- Constant: int UC_BREAK_HYPHENATION This value indicates that a hyphen and a line break may be inserted between ‘S[I-1]’ and ‘S[I]’. But beware of language dependent hyphenation rules. -- Constant: int UC_BREAK_PROHIBITED This value indicates that ‘S[I-1]’ and ‘S[I]’ must not be separated. -- Constant: int UC_BREAK_UNDEFINED This value is not used as a return value; rather, in the overriding argument of the ‘u*_width_linebreaks’ functions, it indicates the absence of an override. The following functions determine the positions at which line breaks are possible. -- Function: void u8_possible_linebreaks (const uint8_t *S, size_t N, const char *ENCODING, char *P) -- Function: void u16_possible_linebreaks (const uint16_t *S, size_t N, const char *ENCODING, char *P) -- Function: void u32_possible_linebreaks (const uint32_t *S, size_t N, const char *ENCODING, char *P) -- Function: void ulc_possible_linebreaks (const char *S, size_t N, const char *ENCODING, char *P) Determines the line break points in S, and stores the result at ‘P[0..N-1]’. Every ‘P[I]’ is assigned one of the values ‘UC_BREAK_MANDATORY’, ‘UC_BREAK_CR_BEFORE_LF’, ‘UC_BREAK_POSSIBLE’, ‘UC_BREAK_HYPHENATION’, ‘UC_BREAK_PROHIBITED’. The following functions determine where line breaks should be inserted so that each line fits in a given width, when output to a device that uses non-proportional fonts. -- Function: int u8_width_linebreaks (const uint8_t *S, size_t N, int WIDTH, int START_COLUMN, int AT_END_COLUMNS, const char *OVERRIDE, const char *ENCODING, char *P) -- Function: int u16_width_linebreaks (const uint16_t *S, size_t N, int WIDTH, int START_COLUMN, int AT_END_COLUMNS, const char *OVERRIDE, const char *ENCODING, char *P) -- Function: int u32_width_linebreaks (const uint32_t *S, size_t N, int WIDTH, int START_COLUMN, int AT_END_COLUMNS, const char *OVERRIDE, const char *ENCODING, char *P) -- Function: int ulc_width_linebreaks (const char *S, size_t N, int WIDTH, int START_COLUMN, int AT_END_COLUMNS, const char *OVERRIDE, const char *ENCODING, char *P) Chooses the best line breaks, assuming that every character occupies a width given by the ‘uc_width’ function (see *note uniwidth.h::). The string is ‘S[0..N-1]’. The maximum number of columns per line is given as WIDTH. The starting column of the string is given as START_COLUMN. If the algorithm shall keep room after the last piece, this amount of room can be given as AT_END_COLUMNS. OVERRIDE is an optional override; if ‘OVERRIDE[I] != UC_BREAK_UNDEFINED’, ‘OVERRIDE[I]’ takes precedence over ‘P[I]’ as returned by the ‘u*_possible_linebreaks’ function. The given ENCODING is used for disambiguating widths in ‘uc_width’. Returns the column after the end of the string, and stores the result at ‘P[0..N-1]’. Every ‘P[I]’ is assigned one of the values ‘UC_BREAK_MANDATORY’, ‘UC_BREAK_CR_BEFORE_LF’, ‘UC_BREAK_POSSIBLE’, ‘UC_BREAK_HYPHENATION’, ‘UC_BREAK_PROHIBITED’. Here the value ‘UC_BREAK_POSSIBLE’ indicates that a line break _should_ be inserted. 13 Normalization forms (composition and decomposition) ‘’ ******************************************************************** This include file defines functions for transforming Unicode strings to one of the four normal forms, known as NFC, NFD, NKFC, NFKD. These transformations involve decomposition and — for NFC and NFKC — composition of Unicode characters. 13.1 Decomposition of Unicode characters ======================================== The following enumerated values are the possible types of decomposition of a Unicode character. -- Constant: int UC_DECOMP_CANONICAL Denotes canonical decomposition. -- Constant: int UC_DECOMP_FONT UCD marker: ‘’. Denotes a font variant (e.g. a blackletter form). -- Constant: int UC_DECOMP_NOBREAK UCD marker: ‘’. Denotes a no-break version of a space or hyphen. -- Constant: int UC_DECOMP_INITIAL UCD marker: ‘’. Denotes an initial presentation form (Arabic). -- Constant: int UC_DECOMP_MEDIAL UCD marker: ‘’. Denotes a medial presentation form (Arabic). -- Constant: int UC_DECOMP_FINAL UCD marker: ‘’. Denotes a final presentation form (Arabic). -- Constant: int UC_DECOMP_ISOLATED UCD marker: ‘’. Denotes an isolated presentation form (Arabic). -- Constant: int UC_DECOMP_CIRCLE UCD marker: ‘’. Denotes an encircled form. -- Constant: int UC_DECOMP_SUPER UCD marker: ‘’. Denotes a superscript form. -- Constant: int UC_DECOMP_SUB UCD marker: ‘’. Denotes a subscript form. -- Constant: int UC_DECOMP_VERTICAL UCD marker: ‘’. Denotes a vertical layout presentation form. -- Constant: int UC_DECOMP_WIDE UCD marker: ‘’. Denotes a wide (or zenkaku) compatibility character. -- Constant: int UC_DECOMP_NARROW UCD marker: ‘’. Denotes a narrow (or hankaku) compatibility character. -- Constant: int UC_DECOMP_SMALL UCD marker: ‘’. Denotes a small variant form (CNS compatibility). -- Constant: int UC_DECOMP_SQUARE UCD marker: ‘’. Denotes a CJK squared font variant. -- Constant: int UC_DECOMP_FRACTION UCD marker: ‘’. Denotes a vulgar fraction form. -- Constant: int UC_DECOMP_COMPAT UCD marker: ‘’. Denotes an otherwise unspecified compatibility character. The following constant denotes the maximum size of decomposition of a single Unicode character. -- Macro: unsigned int UC_DECOMPOSITION_MAX_LENGTH This macro expands to a constant that is the required size of buffer passed to the ‘uc_decomposition’ and ‘uc_canonical_decomposition’ functions. The following functions decompose a Unicode character. -- Function: int uc_decomposition (ucs4_t UC, int *DECOMP_TAG, ucs4_t *DECOMPOSITION) Returns the character decomposition mapping of the Unicode character UC. DECOMPOSITION must point to an array of at least ‘UC_DECOMPOSITION_MAX_LENGTH’ ‘ucs_t’ elements. When a decomposition exists, ‘DECOMPOSITION[0..N-1]’ and ‘*DECOMP_TAG’ are filled and N is returned. Otherwise -1 is returned. -- Function: int uc_canonical_decomposition (ucs4_t UC, ucs4_t *DECOMPOSITION) Returns the canonical character decomposition mapping of the Unicode character UC. DECOMPOSITION must point to an array of at least ‘UC_DECOMPOSITION_MAX_LENGTH’ ‘ucs_t’ elements. When a decomposition exists, ‘DECOMPOSITION[0..N-1]’ is filled and N is returned. Otherwise -1 is returned. Note: This function returns the (simple) “canonical decomposition” of UC. If you want the “full canonical decomposition” of UC, that is, the recursive application of “canonical decomposition”, use the function ‘u*_normalize’ with argument ‘UNINORM_NFD’ instead. 13.2 Composition of Unicode characters ====================================== The following function composes a Unicode character from two Unicode characters. -- Function: ucs4_t uc_composition (ucs4_t UC1, ucs4_t UC2) Attempts to combine the Unicode characters UC1, UC2. UC1 is known to have canonical combining class 0. Returns the combination of UC1 and UC2, if it exists. Returns 0 otherwise. Not all decompositions can be recombined using this function. See the Unicode file ‘CompositionExclusions.txt’ for details. 13.3 Normalization of strings ============================= The Unicode standard defines four normalization forms for Unicode strings. The following type is used to denote a normalization form. -- Type: uninorm_t An object of type ‘uninorm_t’ denotes a Unicode normalization form. This is a scalar type; its values can be compared with ‘==’. The following constants denote the four normalization forms. -- Macro: uninorm_t UNINORM_NFD Denotes Normalization form D: canonical decomposition. -- Macro: uninorm_t UNINORM_NFC Normalization form C: canonical decomposition, then canonical composition. -- Macro: uninorm_t UNINORM_NFKD Normalization form KD: compatibility decomposition. -- Macro: uninorm_t UNINORM_NFKC Normalization form KC: compatibility decomposition, then canonical composition. The following functions operate on ‘uninorm_t’ objects. -- Function: bool uninorm_is_compat_decomposing (uninorm_t NF) Tests whether the normalization form NF does compatibility decomposition. -- Function: bool uninorm_is_composing (uninorm_t NF) Tests whether the normalization form NF includes canonical composition. -- Function: uninorm_t uninorm_decomposing_form (uninorm_t NF) Returns the decomposing variant of the normalization form NF. This maps NFC,NFD → NFD and NFKC,NFKD → NFKD. The following functions apply a Unicode normalization form to a Unicode string. -- Function: uint8_t * u8_normalize (uninorm_t NF, const uint8_t *S, size_t N, uint8_t *RESULTBUF, size_t *LENGTHP) -- Function: uint16_t * u16_normalize (uninorm_t NF, const uint16_t *S, size_t N, uint16_t *RESULTBUF, size_t *LENGTHP) -- Function: uint32_t * u32_normalize (uninorm_t NF, const uint32_t *S, size_t N, uint32_t *RESULTBUF, size_t *LENGTHP) Returns the specified normalization form of a string. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. 13.4 Normalizing comparisons ============================ The following functions compare Unicode string, ignoring differences in normalization. -- Function: int u8_normcmp (const uint8_t *S1, size_t N1, const uint8_t *S2, size_t N2, uninorm_t NF, int *RESULTP) -- Function: int u16_normcmp (const uint16_t *S1, size_t N1, const uint16_t *S2, size_t N2, uninorm_t NF, int *RESULTP) -- Function: int u32_normcmp (const uint32_t *S1, size_t N1, const uint32_t *S2, size_t N2, uninorm_t NF, int *RESULTP) Compares S1 and S2, ignoring differences in normalization. NF must be either ‘UNINORM_NFD’ or ‘UNINORM_NFKD’. If successful, sets ‘*RESULTP’ to -1 if S1 < S2, 0 if S1 = S2, 1 if S1 > S2, and returns 0. Upon failure, returns -1 with ‘errno’ set. -- Function: char * u8_normxfrm (const uint8_t *S, size_t N, uninorm_t NF, char *RESULTBUF, size_t *LENGTHP) -- Function: char * u16_normxfrm (const uint16_t *S, size_t N, uninorm_t NF, char *RESULTBUF, size_t *LENGTHP) -- Function: char * u32_normxfrm (const uint32_t *S, size_t N, uninorm_t NF, char *RESULTBUF, size_t *LENGTHP) Converts the string S of length N to a NUL-terminated byte sequence, in such a way that comparing ‘u8_normxfrm (S1)’ and ‘u8_normxfrm (S2)’ with the ‘u8_cmp2’ function is equivalent to comparing S1 and S2 with the ‘u8_normcoll’ function. NF must be either ‘UNINORM_NFC’ or ‘UNINORM_NFKC’. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. -- Function: int u8_normcoll (const uint8_t *S1, size_t N1, const uint8_t *S2, size_t N2, uninorm_t NF, int *RESULTP) -- Function: int u16_normcoll (const uint16_t *S1, size_t N1, const uint16_t *S2, size_t N2, uninorm_t NF, int *RESULTP) -- Function: int u32_normcoll (const uint32_t *S1, size_t N1, const uint32_t *S2, size_t N2, uninorm_t NF, int *RESULTP) Compares S1 and S2, ignoring differences in normalization, using the collation rules of the current locale. NF must be either ‘UNINORM_NFC’ or ‘UNINORM_NFKC’. If successful, sets ‘*RESULTP’ to -1 if S1 < S2, 0 if S1 = S2, 1 if S1 > S2, and returns 0. Upon failure, returns -1 with ‘errno’ set. 13.5 Normalization of streams of Unicode characters =================================================== A “stream of Unicode characters” is essentially a function that accepts an ‘ucs4_t’ argument repeatedly, optionally combined with a function that “flushes” the stream. -- Type: struct uninorm_filter This is the data type of a stream of Unicode characters that normalizes its input according to a given normalization form and passes the normalized character sequence to the encapsulated stream of Unicode characters. -- Function: struct uninorm_filter * uninorm_filter_create (uninorm_t NF, int (*STREAM_FUNC) (void *STREAM_DATA, ucs4_t UC), void *STREAM_DATA) Creates and returns a normalization filter for Unicode characters. The pair (STREAM_FUNC, STREAM_DATA) is the encapsulated stream. ‘STREAM_FUNC (STREAM_DATA, UC)’ receives the Unicode character UC and returns 0 if successful, or -1 with ‘errno’ set upon failure. Returns the new filter, or NULL with ‘errno’ set upon failure. -- Function: int uninorm_filter_write (struct uninorm_filter *FILTER, ucs4_t UC) Stuffs a Unicode character into a normalizing filter. Returns 0 if successful, or -1 with ‘errno’ set upon failure. -- Function: int uninorm_filter_flush (struct uninorm_filter *FILTER) Brings data buffered in the filter to its destination, the encapsulated stream. Returns 0 if successful, or -1 with ‘errno’ set upon failure. Note! If after calling this function, additional characters are written into the filter, the resulting character sequence in the encapsulated stream will not necessarily be normalized. -- Function: int uninorm_filter_free (struct uninorm_filter *FILTER) Brings data buffered in the filter to its destination, the encapsulated stream, then closes and frees the filter. Returns 0 if successful, or -1 with ‘errno’ set upon failure. 14 Case mappings ‘’ ****************************** This include file defines functions for case mapping for Unicode strings and case insensitive comparison of Unicode strings and C strings. These string functions fix the problems that were mentioned in *note char * strings::, namely, they handle the Croatian LETTER DZ WITH CARON, the German LATIN SMALL LETTER SHARP S, the Greek sigma and the Lithuanian i correctly. 14.1 Case mappings of characters ================================ The following functions implement case mappings on Unicode characters — for those cases only where the result of the mapping is a again a single Unicode character. These mappings are locale and context independent. *WARNING!* These functions are not sufficient for languages such as German, Greek and Lithuanian. Better use the functions below that treat an entire string at once and are language aware. -- Function: ucs4_t uc_toupper (ucs4_t UC) Returns the uppercase mapping of the Unicode character UC. -- Function: ucs4_t uc_tolower (ucs4_t UC) Returns the lowercase mapping of the Unicode character UC. -- Function: ucs4_t uc_totitle (ucs4_t UC) Returns the titlecase mapping of the Unicode character UC. The titlecase mapping of a character is to be used when the character should look like upper case and the following characters are lower cased. For most characters, this is the same as the uppercase mapping. There are only few characters where the title case variant and the upper case variant are different. These characters occur in the Latin writing of the Croatian, Bosnian, and Serbian languages. Lower case Title case Upper case --------------------------------------------------------------------- LATIN SMALL LETTER LATIN CAPITAL LETTER LATIN CAPITAL LETTER LJ L WITH SMALL LETTER LJ J LATIN SMALL LETTER LATIN CAPITAL LETTER LATIN CAPITAL LETTER NJ N WITH SMALL LETTER NJ J LATIN SMALL LETTER LATIN CAPITAL LETTER LATIN CAPITAL LETTER DZ D WITH SMALL LETTER DZ Z LATIN SMALL LETTER LATIN CAPITAL LETTER LATIN CAPITAL LETTER DZ WITH CARON D WITH SMALL LETTER DZ WITH CARON Z WITH CARON 14.2 Case mappings of strings ============================= Case mapping should always be performed on entire strings, not on individual characters. The functions in this section do so. These functions allow to apply a normalization after the case mapping. The reason is that if you want to treat ‘ä’ and ‘Ä’ the same, you most often also want to treat the composed and decomposed forms of such a character, U+00C4 LATIN CAPITAL LETTER A WITH DIAERESIS and U+0041 LATIN CAPITAL LETTER A U+0308 COMBINING DIAERESIS the same. The NF argument designates the normalization. These functions are locale dependent. The ISO639_LANGUAGE argument identifies the language (e.g. ‘"tr"’ for Turkish). NULL means to use locale independent case mappings. -- Function: const char * uc_locale_language () Returns the ISO 639 language code of the current locale. Returns ‘""’ if it is unknown, or in the "C" locale. -- Function: uint8_t * u8_toupper (const uint8_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, uint8_t *RESULTBUF, size_t *LENGTHP) -- Function: uint16_t * u16_toupper (const uint16_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, uint16_t *RESULTBUF, size_t *LENGTHP) -- Function: uint32_t * u32_toupper (const uint32_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, uint32_t *RESULTBUF, size_t *LENGTHP) Returns the uppercase mapping of a string. The NF argument identifies the normalization form to apply after the case-mapping. It can also be NULL, for no normalization. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. -- Function: uint8_t * u8_tolower (const uint8_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, uint8_t *RESULTBUF, size_t *LENGTHP) -- Function: uint16_t * u16_tolower (const uint16_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, uint16_t *RESULTBUF, size_t *LENGTHP) -- Function: uint32_t * u32_tolower (const uint32_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, uint32_t *RESULTBUF, size_t *LENGTHP) Returns the lowercase mapping of a string. The NF argument identifies the normalization form to apply after the case-mapping. It can also be NULL, for no normalization. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. -- Function: uint8_t * u8_totitle (const uint8_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, uint8_t *RESULTBUF, size_t *LENGTHP) -- Function: uint16_t * u16_totitle (const uint16_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, uint16_t *RESULTBUF, size_t *LENGTHP) -- Function: uint32_t * u32_totitle (const uint32_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, uint32_t *RESULTBUF, size_t *LENGTHP) Returns the titlecase mapping of a string. Mapping to title case means that, in each word, the first cased character is being mapped to title case and the remaining characters of the word are being mapped to lower case. The NF argument identifies the normalization form to apply after the case-mapping. It can also be NULL, for no normalization. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. 14.3 Case mappings of substrings ================================ Case mapping of a substring cannot simply be performed by extracting the substring and then applying the case mapping function to it. This does not work because case mapping requires some information about the surrounding characters. The following functions allow to apply case mappings to substrings of a given string, while taking into account the characters that precede it (the “prefix”) and the characters that follow it (the “suffix”). -- Type: casing_prefix_context_t This data type denotes the case-mapping context that is given by a prefix string. It is an immediate type that can be copied by simple assignment, without involving memory allocation. It is not an array type. -- Constant: casing_prefix_context_t unicase_empty_prefix_context This constant is the case-mapping context that corresponds to an empty prefix string. The following functions return ‘casing_prefix_context_t’ objects: -- Function: casing_prefix_context_t u8_casing_prefix_context (const uint8_t *S, size_t N) -- Function: casing_prefix_context_t u16_casing_prefix_context (const uint16_t *S, size_t N) -- Function: casing_prefix_context_t u32_casing_prefix_context (const uint32_t *S, size_t N) Returns the case-mapping context of a given prefix string. -- Function: casing_prefix_context_t u8_casing_prefixes_context (const uint8_t *S, size_t N, casing_prefix_context_t A_CONTEXT) -- Function: casing_prefix_context_t u16_casing_prefixes_context (const uint16_t *S, size_t N, casing_prefix_context_t A_CONTEXT) -- Function: casing_prefix_context_t u32_casing_prefixes_context (const uint32_t *S, size_t N, casing_prefix_context_t A_CONTEXT) Returns the case-mapping context of the prefix concat(A, S), given the case-mapping context of the prefix A. -- Type: casing_suffix_context_t This data type denotes the case-mapping context that is given by a suffix string. It is an immediate type that can be copied by simple assignment, without involving memory allocation. It is not an array type. -- Constant: casing_suffix_context_t unicase_empty_suffix_context This constant is the case-mapping context that corresponds to an empty suffix string. The following functions return ‘casing_suffix_context_t’ objects: -- Function: casing_suffix_context_t u8_casing_suffix_context (const uint8_t *S, size_t N) -- Function: casing_suffix_context_t u16_casing_suffix_context (const uint16_t *S, size_t N) -- Function: casing_suffix_context_t u32_casing_suffix_context (const uint32_t *S, size_t N) Returns the case-mapping context of a given suffix string. -- Function: casing_suffix_context_t u8_casing_suffixes_context (const uint8_t *S, size_t N, casing_suffix_context_t A_CONTEXT) -- Function: casing_suffix_context_t u16_casing_suffixes_context (const uint16_t *S, size_t N, casing_suffix_context_t A_CONTEXT) -- Function: casing_suffix_context_t u32_casing_suffixes_context (const uint32_t *S, size_t N, casing_suffix_context_t A_CONTEXT) Returns the case-mapping context of the suffix concat(S, A), given the case-mapping context of the suffix A. The following functions perform a case mapping, considering the prefix context and the suffix context. -- Function: uint8_t * u8_ct_toupper (const uint8_t *S, size_t N, casing_prefix_context_t PREFIX_CONTEXT, casing_suffix_context_t SUFFIX_CONTEXT, const char *ISO639_LANGUAGE, uninorm_t NF, uint8_t *RESULTBUF, size_t *LENGTHP) -- Function: uint16_t * u16_ct_toupper (const uint16_t *S, size_t N, casing_prefix_context_t PREFIX_CONTEXT, casing_suffix_context_t SUFFIX_CONTEXT, const char *ISO639_LANGUAGE, uninorm_t NF, uint16_t *RESULTBUF, size_t *LENGTHP) -- Function: uint32_t * u32_ct_toupper (const uint32_t *S, size_t N, casing_prefix_context_t PREFIX_CONTEXT, casing_suffix_context_t SUFFIX_CONTEXT, const char *ISO639_LANGUAGE, uninorm_t NF, uint32_t *RESULTBUF, size_t *LENGTHP) Returns the uppercase mapping of a string that is surrounded by a prefix and a suffix. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. -- Function: uint8_t * u8_ct_tolower (const uint8_t *S, size_t N, casing_prefix_context_t PREFIX_CONTEXT, casing_suffix_context_t SUFFIX_CONTEXT, const char *ISO639_LANGUAGE, uninorm_t NF, uint8_t *RESULTBUF, size_t *LENGTHP) -- Function: uint16_t * u16_ct_tolower (const uint16_t *S, size_t N, casing_prefix_context_t PREFIX_CONTEXT, casing_suffix_context_t SUFFIX_CONTEXT, const char *ISO639_LANGUAGE, uninorm_t NF, uint16_t *RESULTBUF, size_t *LENGTHP) -- Function: uint32_t * u32_ct_tolower (const uint32_t *S, size_t N, casing_prefix_context_t PREFIX_CONTEXT, casing_suffix_context_t SUFFIX_CONTEXT, const char *ISO639_LANGUAGE, uninorm_t NF, uint32_t *RESULTBUF, size_t *LENGTHP) Returns the lowercase mapping of a string that is surrounded by a prefix and a suffix. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. -- Function: uint8_t * u8_ct_totitle (const uint8_t *S, size_t N, casing_prefix_context_t PREFIX_CONTEXT, casing_suffix_context_t SUFFIX_CONTEXT, const char *ISO639_LANGUAGE, uninorm_t NF, uint8_t *RESULTBUF, size_t *LENGTHP) -- Function: uint16_t * u16_ct_totitle (const uint16_t *S, size_t N, casing_prefix_context_t PREFIX_CONTEXT, casing_suffix_context_t SUFFIX_CONTEXT, const char *ISO639_LANGUAGE, uninorm_t NF, uint16_t *RESULTBUF, size_t *LENGTHP) -- Function: uint32_t * u32_ct_totitle (const uint32_t *S, size_t N, casing_prefix_context_t PREFIX_CONTEXT, casing_suffix_context_t SUFFIX_CONTEXT, const char *ISO639_LANGUAGE, uninorm_t NF, uint32_t *RESULTBUF, size_t *LENGTHP) Returns the titlecase mapping of a string that is surrounded by a prefix and a suffix. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. For example, to uppercase the UTF-8 substring between ‘s + start_index’ and ‘s + end_index’ of a string that extends from ‘s’ to ‘s + u8_strlen (s)’, you can use the statements size_t result_length; uint8_t result = u8_ct_toupper (s + start_index, end_index - start_index, u8_casing_prefix_context (s, start_index), u8_casing_suffix_context (s + end_index, u8_strlen (s) - end_index), iso639_language, NULL, NULL, &result_length); 14.4 Case insensitive comparison ================================ The following functions implement comparison that ignores differences in case and normalization. -- Function: uint8_t * u8_casefold (const uint8_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, uint8_t *RESULTBUF, size_t *LENGTHP) -- Function: uint16_t * u16_casefold (const uint16_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, uint16_t *RESULTBUF, size_t *LENGTHP) -- Function: uint32_t * u32_casefold (const uint32_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, uint32_t *RESULTBUF, size_t *LENGTHP) Returns the case folded string. Comparing ‘u8_casefold (S1)’ and ‘u8_casefold (S2)’ with the ‘u8_cmp2’ function is equivalent to comparing S1 and S2 with ‘u8_casecmp’. The NF argument identifies the normalization form to apply after the case-mapping. It can also be NULL, for no normalization. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. -- Function: uint8_t * u8_ct_casefold (const uint8_t *S, size_t N, casing_prefix_context_t PREFIX_CONTEXT, casing_suffix_context_t SUFFIX_CONTEXT, const char *ISO639_LANGUAGE, uninorm_t NF, uint8_t *RESULTBUF, size_t *LENGTHP) -- Function: uint16_t * u16_ct_casefold (const uint16_t *S, size_t N, casing_prefix_context_t PREFIX_CONTEXT, casing_suffix_context_t SUFFIX_CONTEXT, const char *ISO639_LANGUAGE, uninorm_t NF, uint16_t *RESULTBUF, size_t *LENGTHP) -- Function: uint32_t * u32_ct_casefold (const uint32_t *S, size_t N, casing_prefix_context_t PREFIX_CONTEXT, casing_suffix_context_t SUFFIX_CONTEXT, const char *ISO639_LANGUAGE, uninorm_t NF, uint32_t *RESULTBUF, size_t *LENGTHP) Returns the case folded string. The case folding takes into account the case mapping contexts of the prefix and suffix strings. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. The following functions ignore locale-dependent collation rules, but do use locale-dependent case mappings (if ISO639_LANGUAGE is not NULL). -- Function: int u8_casecmp (const uint8_t *S1, size_t N1, const uint8_t *S2, size_t N2, const char *ISO639_LANGUAGE, uninorm_t NF, int *RESULTP) -- Function: int u16_casecmp (const uint16_t *S1, size_t N1, const uint16_t *S2, size_t N2, const char *ISO639_LANGUAGE, uninorm_t NF, int *RESULTP) -- Function: int u32_casecmp (const uint32_t *S1, size_t N1, const uint32_t *S2, size_t N2, const char *ISO639_LANGUAGE, uninorm_t NF, int *RESULTP) -- Function: int ulc_casecmp (const char *S1, size_t N1, const char *S2, size_t N2, const char *ISO639_LANGUAGE, uninorm_t NF, int *RESULTP) Compares S1 and S2, ignoring differences in case and normalization. The NF argument identifies the normalization form to apply after the case-mapping. It can also be NULL, for no normalization. If successful, sets ‘*RESULTP’ to -1 if S1 < S2, 0 if S1 = S2, 1 if S1 > S2, and returns 0. Upon failure, returns -1 with ‘errno’ set. The following functions additionally take into account the sorting rules of the current locale. -- Function: char * u8_casexfrm (const uint8_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, char *RESULTBUF, size_t *LENGTHP) -- Function: char * u16_casexfrm (const uint16_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, char *RESULTBUF, size_t *LENGTHP) -- Function: char * u32_casexfrm (const uint32_t *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, char *RESULTBUF, size_t *LENGTHP) -- Function: char * ulc_casexfrm (const char *S, size_t N, const char *ISO639_LANGUAGE, uninorm_t NF, char *RESULTBUF, size_t *LENGTHP) Converts the string S of length N to a NUL-terminated byte sequence, in such a way that comparing ‘u8_casexfrm (S1)’ and ‘u8_casexfrm (S2)’ with the gnulib function ‘memcmp2’ is equivalent to comparing S1 and S2 with ‘u8_casecoll’. NF must be either ‘UNINORM_NFC’, ‘UNINORM_NFKC’, or NULL for no normalization. The RESULTBUF and LENGTHP arguments are as described in chapter *note Conventions::. -- Function: int u8_casecoll (const uint8_t *S1, size_t N1, const uint8_t *S2, size_t N2, const char *ISO639_LANGUAGE, uninorm_t NF, int *RESULTP) -- Function: int u16_casecoll (const uint16_t *S1, size_t N1, const uint16_t *S2, size_t N2, const char *ISO639_LANGUAGE, uninorm_t NF, int *RESULTP) -- Function: int u32_casecoll (const uint32_t *S1, size_t N1, const uint32_t *S2, size_t N2, const char *ISO639_LANGUAGE, uninorm_t NF, int *RESULTP) -- Function: int ulc_casecoll (const char *S1, size_t N1, const char *S2, size_t N2, const char *ISO639_LANGUAGE, uninorm_t NF, int *RESULTP) Compares S1 and S2, ignoring differences in case and normalization, using the collation rules of the current locale. The NF argument identifies the normalization form to apply after the case-mapping. It must be either ‘UNINORM_NFC’ or ‘UNINORM_NFKC’. It can also be NULL, for no normalization. If successful, sets ‘*RESULTP’ to -1 if S1 < S2, 0 if S1 = S2, 1 if S1 > S2, and returns 0. Upon failure, returns -1 with ‘errno’ set. 14.5 Case detection =================== The following functions determine whether a Unicode string is entirely in upper case. or entirely in lower case, or entirely in title case, or already case-folded. -- Function: int u8_is_uppercase (const uint8_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) -- Function: int u16_is_uppercase (const uint16_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) -- Function: int u32_is_uppercase (const uint32_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) Sets ‘*RESULTP’ to true if mapping NFD(S) to upper case is a no-op, or to false otherwise, and returns 0. Upon failure, returns -1 with ‘errno’ set. -- Function: int u8_is_lowercase (const uint8_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) -- Function: int u16_is_lowercase (const uint16_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) -- Function: int u32_is_lowercase (const uint32_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) Sets ‘*RESULTP’ to true if mapping NFD(S) to lower case is a no-op, or to false otherwise, and returns 0. Upon failure, returns -1 with ‘errno’ set. -- Function: int u8_is_titlecase (const uint8_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) -- Function: int u16_is_titlecase (const uint16_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) -- Function: int u32_is_titlecase (const uint32_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) Sets ‘*RESULTP’ to true if mapping NFD(S) to title case is a no-op, or to false otherwise, and returns 0. Upon failure, returns -1 with ‘errno’ set. -- Function: int u8_is_casefolded (const uint8_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) -- Function: int u16_is_casefolded (const uint16_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) -- Function: int u32_is_casefolded (const uint32_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) Sets ‘*RESULTP’ to true if applying case folding to NFD(S) is a no-op, or to false otherwise, and returns 0. Upon failure, returns -1 with ‘errno’ set. The following functions determine whether case mappings have any effect on a Unicode string. -- Function: int u8_is_cased (const uint8_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) -- Function: int u16_is_cased (const uint16_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) -- Function: int u32_is_cased (const uint32_t *S, size_t N, const char *ISO639_LANGUAGE, bool *RESULTP) Sets ‘*RESULTP’ to true if case matters for S, that is, if mapping NFD(S) to either upper case or lower case or title case is not a no-op. Set ‘*RESULTP’ to false if NFD(S) maps to itself under the upper case mapping, under the lower case mapping, and under the title case mapping; in other words, when NFD(S) consists entirely of caseless characters. Upon failure, returns -1 with ‘errno’ set. 15 Regular expressions ‘’ ************************************* This include file is not yet implemented. 16 Using the library ******************** This chapter explains some practical considerations, regarding the installation and compiler options that are needed in order to use this library. 16.1 Installation ================= Before you can use the library, it must be installed. First, you have to make sure all dependencies are installed. They are listed in the file ‘DEPENDENCIES’. Then you can proceed to build and install the library, as described in the file ‘INSTALL’. For installation on Windows systems, please refer to the file ‘INSTALL.windows’. 16.2 Compiler options ===================== Let’s denote as ‘LIBUNISTRING_PREFIX’ the value of the ‘--prefix’ option that you passed to ‘configure’ while installing this package. If you didn’t pass any ‘--prefix’ option, then the package is installed in ‘/usr/local’. Let’s denote as ‘LIBUNISTRING_INCLUDEDIR’ the directory where the include files were installed. This is usually the same as ‘${LIBUNISTRING_PREFIX}/include’. Except that if you passed an ‘--includedir’ option to ‘configure’, it is the value of that option. Let’s further denote as ‘LIBUNISTRING_LIBDIR’ the directory where the library itself was installed. This is the value that you passed with the ‘--libdir’ option to ‘configure’, or otherwise the same as ‘${LIBUNISTRING_PREFIX}/lib’. Recall that when building in 64-bit mode on a 64-bit GNU/Linux system that supports executables in either 64-bit mode or 32-bit mode, you should have used the option ‘--libdir=${LIBUNISTRING_PREFIX}/lib64’. So that the compiler finds the include files, you have to pass it the option ‘-I${LIBUNISTRING_INCLUDEDIR}’. So that the compiler finds the library during its linking pass, you have to pass it the options ‘-L${LIBUNISTRING_LIBDIR} -lunistring’. On some systems, in some configurations, you also have to pass options needed for linking with ‘libiconv’. The autoconf macro ‘gl_LIBUNISTRING’ (see *note Autoconf macro::) deals with this particularity. 16.3 Include files ================== Most of the include files have been presented in the introduction, see *note Introduction::, and subsequent detailed chapters. Another include file is ‘’. It contains the version number of the libunistring library. -- Macro: int _LIBUNISTRING_VERSION This constant contains the version of libunistring that is being used at compile time. It encodes the major, minor, and subminor parts of the version number. These parts are encoded in the form ‘(major<<16) + (minor<<8) + subminor’. -- Constant: int _libunistring_version This constant contains the version of libunistring that is being used at run time. It encodes the major, minor, and subminor parts of the version number. These parts are encoded in the form ‘(major<<16) + (minor<<8) + subminor’. It is possible that ‘_libunistring_version’ is greater than ‘_LIBUNISTRING_VERSION’. This can happen when you use ‘libunistring’ as a shared library, and a newer, binary backward-compatible version has been installed after your program that uses ‘libunistring’ was installed. ‘’ also contains: -- Constant: int _libunistring_unicode_version This constant contains the version of the Unicode standard that is implemented by libunistring. It encodes the major and minor parts of the version number only. These parts are encoded in the form ‘(major<<8) + minor’. 16.4 Autoconf macro =================== GNU Gnulib provides an autoconf macro that tests for the availability of ‘libunistring’. It is contained in the Gnulib module ‘libunistring’, see . The macro is called ‘gl_LIBUNISTRING’. It searches for an installed libunistring. If found, it sets and AC_SUBSTs ‘HAVE_LIBUNISTRING=yes’ and the ‘LIBUNISTRING’ and ‘LTLIBUNISTRING’ variables and augments the ‘CPPFLAGS’ variable, and defines the C macro ‘HAVE_LIBUNISTRING’ to 1. Otherwise, it sets and AC_SUBSTs ‘HAVE_LIBUNISTRING=no’ and ‘LIBUNISTRING’ and ‘LTLIBUNISTRING’ to empty. The complexities that ‘gl_LIBUNISTRING’ deals with are the following: • On some operating systems, in some configurations, libunistring depends on ‘libiconv’, and the options for linking with libiconv must be mentioned explicitly on the link command line. • GNU ‘libunistring’, if installed, is not necessarily already in the search path (‘CPPFLAGS’ for the include file search path, ‘LDFLAGS’ for the library search path). • GNU ‘libunistring’, if installed, is not necessarily already in the run time library search path. To avoid the need for setting an environment variable like ‘LD_LIBRARY_PATH’, the macro adds the appropriate run time search path options to the ‘LIBUNISTRING’ variable. This works on most systems. 16.5 Reporting problems ======================= If you encounter any problem, please don’t hesitate to submit a detailed bug report either in the bug tracker at the project page , or by email to the ‘bug-libunistring@gnu.org’ mailing list. Please always include the version number of this library, and a short description of your operating system and compilation environment with corresponding version numbers. For problems that appear while building and installing ‘libunistring’, for which you don’t find the remedy in the ‘INSTALL’ file, please include a description of the options that you passed to the ‘configure’ script. 17 More advanced functionality ****************************** For bidirectional reordering of strings, we recommend the GNU FriBidi library: . For the rendering of Unicode strings outside of the context of a given toolkit (KDE/Qt or GNOME/Gtk), we recommend the Pango library: . Appendix A The ‘wchar_t’ mess ***************************** The ISO C and POSIX standard creators made an attempt to fix the first problem mentioned in the section *note char * strings::. They introduced • a type ‘wchar_t’, designed to encapsulate an entire character, • a “wide string” type ‘wchar_t *’, with some API functions declared in ‘’, and • functions declared in ‘’ that were meant to supplant the ones in ‘’. Unfortunately, this API and its implementation has numerous problems: • On Windows platforms and on AIX in 32-bit mode, ‘wchar_t’ is a 16-bit type. This means that it can never accommodate an entire Unicode character. Either the ‘wchar_t *’ strings are limited to characters in UCS-2 (the “Basic Multilingual Plane” of Unicode), or — if ‘wchar_t *’ strings are encoded in UTF-16 — a ‘wchar_t’ represents only half of a character in the worst case, making the ‘’ functions pointless. • On Solaris and FreeBSD, the ‘wchar_t’ encoding is locale dependent and undocumented. This means, if you want to know any property of a ‘wchar_t’ character, other than the properties defined by ‘’ — such as whether it’s a dash, currency symbol, paragraph separator, or similar —, you have to convert it to ‘char *’ encoding first, by use of the function ‘wctomb’. • When you read a stream of wide characters, through the functions ‘fgetwc’ and ‘fgetws’, and when the input stream/file is not in the expected encoding, you have no way to determine the invalid byte sequence and do some corrective action. If you use these functions, your program becomes “garbage in - more garbage out” or “garbage in - abort”. As a consequence, it is better to use multibyte strings, as explained in the section *note char * strings::. Such multibyte strings can bypass limitations of the ‘wchar_t’ type, if you use functions defined in gnulib and libunistring for text processing. They can also faithfully transport malformed characters that were present in the input, without requiring the program to produce garbage or abort. Appendix B The ‘char32_t’ problem ********************************* In response to the ‘wchar_t’ mess described in the previous section, ISO C 11 introduces two new types: ‘char32_t’ and ‘char16_t’. ‘char32_t’ is a type like ‘wchar_t’, with the added guarantee that it is 32 bits wide. So, it is a type that is appropriate for encoding a Unicode character. It is meant to resolve the problems of the 16-bit wide ‘wchar_t’ on AIX and Windows platforms, and allow a saner programming model for wide character strings across all platforms. ‘char16_t’ is a type like ‘wchar_t’, with the added guarantee that it is 16 bits wide. It is meant to allow porting programs that use the broken wide character strings programming model from Windows to all platforms. Of course, no one needs this. These types are accompanied with a syntax for defining wide string literals with these element types: ‘u"..."’ and ‘U"..."’. So far, so good. What the ISO C designers forgot, is to provide standardized C library functions that operate on these wide character strings. They standardized only the most basic functions, ‘mbrtoc32’ and ‘c32rtomb’, which are analogous to ‘mbrtowc’ and ‘wcrtomb’, respectively. For the rest, GNU gnulib provides the functions: • Functions for converting an entire string: ‘mbstoc32s’ – like ‘mbstowcs’, ‘c32stombs’ – like ‘wcstombs’. • Functions for testing the properties of a 32-bit wide character: ‘c32isalnum’, ‘c32isalpha’, etc. – like ‘iswalnum’, ‘iswalpha’, etc. Still, this API has two problems: • The ‘char32_t’ encoding is locale dependent and undocumented. This means, if you want to know any property of a ‘char32_t’ character, other than the properties defined by ‘’ – such as whether it’s a dash, currency symbol, paragraph separator, or similar –, you have to convert it to ‘char *’ encoding first, by use of the function ‘c32tomb’. • Even on platforms where ‘wchar_t’ is 32 bits wide, the ‘char32_t’ encoding may be different from the ‘wchar_t’ encoding. Appendix C Licenses ******************* The files of this package are covered by the licenses indicated in each particular file or directory. Here is a summary: • The ‘libunistring’ library and its header files are dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+". This means, you can use it under either • − the terms of the GNU Lesser General Public License (LGPL) version 3 or (at your option) any later version, or • − the terms of the GNU General Public License (GPL) version 2 or (at your option) any later version, or • − the same dual license "the GNU LGPLv3+ or the GNU GPLv2+". You find the GNU LGPL version 3 in *note GNU LGPL::. This license is based on the GNU GPL version 3, see *note GNU GPL::. You can find the GNU GPL version 2 at . Note: This dual license makes it possible for the ‘libunistring’ library to be used by packages under GPLv2 or GPLv2+ licenses, in particular. See the table in . • This manual is free documentation. It is dually licensed under the GNU FDL and the GNU GPL. This means that you can redistribute this manual under either of these two licenses, at your choice. This manual is covered by the GNU FDL. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License (FDL), either version 1.2 of the License, or (at your option) any later version published by the Free Software Foundation (FSF); with no Invariant Sections, with no Front-Cover Text, and with no Back-Cover Texts. A copy of the license is included in *note GNU FDL::. This manual is covered by the GNU GPL. 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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 16. Limitation of Liability. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 17. Interpretation of Sections 15 and 16. If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee. END OF TERMS AND CONDITIONS =========================== How to Apply These Terms to Your New Programs ============================================= If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the “copyright” line and a pointer to where the full notice is found. ONE LINE TO GIVE THE PROGRAM'S NAME AND A BRIEF IDEA OF WHAT IT DOES. Copyright (C) YEAR NAME OF AUTHOR This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . Also add information on how to contact you by electronic and paper mail. If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode: PROGRAM Copyright (C) YEAR NAME OF AUTHOR This program comes with ABSOLUTELY NO WARRANTY; for details type ‘show w’. This is free software, and you are welcome to redistribute it under certain conditions; type ‘show c’ for details. The hypothetical commands ‘show w’ and ‘show c’ should show the appropriate parts of the General Public License. Of course, your program’s commands might be different; for a GUI interface, you would use an “about box”. You should also get your employer (if you work as a programmer) or school, if any, to sign a “copyright disclaimer” for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see . The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read . C.2 GNU LESSER GENERAL PUBLIC LICENSE ===================================== Version 3, 29 June 2007 Copyright © 2007 Free Software Foundation, Inc. Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. This version of the GNU Lesser General Public License incorporates the terms and conditions of version 3 of the GNU General Public License, supplemented by the additional permissions listed below. 0. Additional Definitions. As used herein, “this License” refers to version 3 of the GNU Lesser General Public License, and the “GNU GPL” refers to version 3 of the GNU General Public License. “The Library” refers to a covered work governed by this License, other than an Application or a Combined Work as defined below. An “Application” is any work that makes use of an interface provided by the Library, but which is not otherwise based on the Library. Defining a subclass of a class defined by the Library is deemed a mode of using an interface provided by the Library. A “Combined Work” is a work produced by combining or linking an Application with the Library. The particular version of the Library with which the Combined Work was made is also called the “Linked Version”. The “Minimal Corresponding Source” for a Combined Work means the Corresponding Source for the Combined Work, excluding any source code for portions of the Combined Work that, considered in isolation, are based on the Application, and not on the Linked Version. The “Corresponding Application Code” for a Combined Work means the object code and/or source code for the Application, including any data and utility programs needed for reproducing the Combined Work from the Application, but excluding the System Libraries of the Combined Work. 1. Exception to Section 3 of the GNU GPL. You may convey a covered work under sections 3 and 4 of this License without being bound by section 3 of the GNU GPL. 2. Conveying Modified Versions. If you modify a copy of the Library, and, in your modifications, a facility refers to a function or data to be supplied by an Application that uses the facility (other than as an argument passed when the facility is invoked), then you may convey a copy of the modified version: a. under this License, provided that you make a good faith effort to ensure that, in the event an Application does not supply the function or data, the facility still operates, and performs whatever part of its purpose remains meaningful, or b. under the GNU GPL, with none of the additional permissions of this License applicable to that copy. 3. Object Code Incorporating Material from Library Header Files. The object code form of an Application may incorporate material from a header file that is part of the Library. You may convey such object code under terms of your choice, provided that, if the incorporated material is not limited to numerical parameters, data structure layouts and accessors, or small macros, inline functions and templates (ten or fewer lines in length), you do both of the following: a. Give prominent notice with each copy of the object code that the Library is used in it and that the Library and its use are covered by this License. b. Accompany the object code with a copy of the GNU GPL and this license document. 4. Combined Works. You may convey a Combined Work under terms of your choice that, taken together, effectively do not restrict modification of the portions of the Library contained in the Combined Work and reverse engineering for debugging such modifications, if you also do each of the following: a. Give prominent notice with each copy of the Combined Work that the Library is used in it and that the Library and its use are covered by this License. b. Accompany the Combined Work with a copy of the GNU GPL and this license document. c. For a Combined Work that displays copyright notices during execution, include the copyright notice for the Library among these notices, as well as a reference directing the user to the copies of the GNU GPL and this license document. d. Do one of the following: 0. Convey the Minimal Corresponding Source under the terms of this License, and the Corresponding Application Code in a form suitable for, and under terms that permit, the user to recombine or relink the Application with a modified version of the Linked Version to produce a modified Combined Work, in the manner specified by section 6 of the GNU GPL for conveying Corresponding Source. 1. Use a suitable shared library mechanism for linking with the Library. A suitable mechanism is one that (a) uses at run time a copy of the Library already present on the user’s computer system, and (b) will operate properly with a modified version of the Library that is interface-compatible with the Linked Version. e. Provide Installation Information, but only if you would otherwise be required to provide such information under section 6 of the GNU GPL, and only to the extent that such information is necessary to install and execute a modified version of the Combined Work produced by recombining or relinking the Application with a modified version of the Linked Version. (If you use option 4d0, the Installation Information must accompany the Minimal Corresponding Source and Corresponding Application Code. If you use option 4d1, you must provide the Installation Information in the manner specified by section 6 of the GNU GPL for conveying Corresponding Source.) 5. Combined Libraries. You may place library facilities that are a work based on the Library side by side in a single library together with other library facilities that are not Applications and are not covered by this License, and convey such a combined library under terms of your choice, if you do both of the following: a. Accompany the combined library with a copy of the same work based on the Library, uncombined with any other library facilities, conveyed under the terms of this License. b. Give prominent notice with the combined library that part of it is a work based on the Library, and explaining where to find the accompanying uncombined form of the same work. 6. Revised Versions of the GNU Lesser General Public License. The Free Software Foundation may publish revised and/or new versions of the GNU Lesser General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Library as you received it specifies that a certain numbered version of the GNU Lesser General Public License “or any later version” applies to it, you have the option of following the terms and conditions either of that published version or of any later version published by the Free Software Foundation. If the Library as you received it does not specify a version number of the GNU Lesser General Public License, you may choose any version of the GNU Lesser General Public License ever published by the Free Software Foundation. If the Library as you received it specifies that a proxy can decide whether future versions of the GNU Lesser General Public License shall apply, that proxy’s public statement of acceptance of any version is permanent authorization for you to choose that version for the Library. C.3 GNU Free Documentation License ================================== Version 1.3, 3 November 2008 Copyright © 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc. Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. 0. PREAMBLE The purpose of this License is to make a manual, textbook, or other functional and useful document “free” in the sense of freedom: to assure everyone the effective freedom to copy and redistribute it, with or without modifying it, either commercially or noncommercially. Secondarily, this License preserves for the author and publisher a way to get credit for their work, while not being considered responsible for modifications made by others. This License is a kind of “copyleft”, which means that derivative works of the document must themselves be free in the same sense. It complements the GNU General Public License, which is a copyleft license designed for free software. We have designed this License in order to use it for manuals for free software, because free software needs free documentation: a free program should come with manuals providing the same freedoms that the software does. But this License is not limited to software manuals; it can be used for any textual work, regardless of subject matter or whether it is published as a printed book. We recommend this License principally for works whose purpose is instruction or reference. 1. APPLICABILITY AND DEFINITIONS This License applies to any manual or other work, in any medium, that contains a notice placed by the copyright holder saying it can be distributed under the terms of this License. Such a notice grants a world-wide, royalty-free license, unlimited in duration, to use that work under the conditions stated herein. The “Document”, below, refers to any such manual or work. Any member of the public is a licensee, and is addressed as “you”. You accept the license if you copy, modify or distribute the work in a way requiring permission under copyright law. A “Modified Version” of the Document means any work containing the Document or a portion of it, either copied verbatim, or with modifications and/or translated into another language. A “Secondary Section” is a named appendix or a front-matter section of the Document that deals exclusively with the relationship of the publishers or authors of the Document to the Document’s overall subject (or to related matters) and contains nothing that could fall directly within that overall subject. (Thus, if the Document is in part a textbook of mathematics, a Secondary Section may not explain any mathematics.) The relationship could be a matter of historical connection with the subject or with related matters, or of legal, commercial, philosophical, ethical or political position regarding them. The “Invariant Sections” are certain Secondary Sections whose titles are designated, as being those of Invariant Sections, in the notice that says that the Document is released under this License. If a section does not fit the above definition of Secondary then it is not allowed to be designated as Invariant. The Document may contain zero Invariant Sections. If the Document does not identify any Invariant Sections then there are none. The “Cover Texts” are certain short passages of text that are listed, as Front-Cover Texts or Back-Cover Texts, in the notice that says that the Document is released under this License. A Front-Cover Text may be at most 5 words, and a Back-Cover Text may be at most 25 words. A “Transparent” copy of the Document means a machine-readable copy, represented in a format whose specification is available to the general public, that is suitable for revising the document straightforwardly with generic text editors or (for images composed of pixels) generic paint programs or (for drawings) some widely available drawing editor, and that is suitable for input to text formatters or for automatic translation to a variety of formats suitable for input to text formatters. A copy made in an otherwise Transparent file format whose markup, or absence of markup, has been arranged to thwart or discourage subsequent modification by readers is not Transparent. An image format is not Transparent if used for any substantial amount of text. A copy that is not “Transparent” is called “Opaque”. Examples of suitable formats for Transparent copies include plain ASCII without markup, Texinfo input format, LaTeX input format, SGML or XML using a publicly available DTD, and standard-conforming simple HTML, PostScript or PDF designed for human modification. Examples of transparent image formats include PNG, XCF and JPG. Opaque formats include proprietary formats that can be read and edited only by proprietary word processors, SGML or XML for which the DTD and/or processing tools are not generally available, and the machine-generated HTML, PostScript or PDF produced by some word processors for output purposes only. The “Title Page” means, for a printed book, the title page itself, plus such following pages as are needed to hold, legibly, the material this License requires to appear in the title page. For works in formats which do not have any title page as such, “Title Page” means the text near the most prominent appearance of the work’s title, preceding the beginning of the body of the text. The “publisher” means any person or entity that distributes copies of the Document to the public. A section “Entitled XYZ” means a named subunit of the Document whose title either is precisely XYZ or contains XYZ in parentheses following text that translates XYZ in another language. (Here XYZ stands for a specific section name mentioned below, such as “Acknowledgements”, “Dedications”, “Endorsements”, or “History”.) To “Preserve the Title” of such a section when you modify the Document means that it remains a section “Entitled XYZ” according to this definition. The Document may include Warranty Disclaimers next to the notice which states that this License applies to the Document. These Warranty Disclaimers are considered to be included by reference in this License, but only as regards disclaiming warranties: any other implication that these Warranty Disclaimers may have is void and has no effect on the meaning of this License. 2. VERBATIM COPYING You may copy and distribute the Document in any medium, either commercially or noncommercially, provided that this License, the copyright notices, and the license notice saying this License applies to the Document are reproduced in all copies, and that you add no other conditions whatsoever to those of this License. You may not use technical measures to obstruct or control the reading or further copying of the copies you make or distribute. However, you may accept compensation in exchange for copies. If you distribute a large enough number of copies you must also follow the conditions in section 3. You may also lend copies, under the same conditions stated above, and you may publicly display copies. 3. COPYING IN QUANTITY If you publish printed copies (or copies in media that commonly have printed covers) of the Document, numbering more than 100, and the Document’s license notice requires Cover Texts, you must enclose the copies in covers that carry, clearly and legibly, all these Cover Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on the back cover. Both covers must also clearly and legibly identify you as the publisher of these copies. The front cover must present the full title with all words of the title equally prominent and visible. You may add other material on the covers in addition. Copying with changes limited to the covers, as long as they preserve the title of the Document and satisfy these conditions, can be treated as verbatim copying in other respects. If the required texts for either cover are too voluminous to fit legibly, you should put the first ones listed (as many as fit reasonably) on the actual cover, and continue the rest onto adjacent pages. If you publish or distribute Opaque copies of the Document numbering more than 100, you must either include a machine-readable Transparent copy along with each Opaque copy, or state in or with each Opaque copy a computer-network location from which the general network-using public has access to download using public-standard network protocols a complete Transparent copy of the Document, free of added material. If you use the latter option, you must take reasonably prudent steps, when you begin distribution of Opaque copies in quantity, to ensure that this Transparent copy will remain thus accessible at the stated location until at least one year after the last time you distribute an Opaque copy (directly or through your agents or retailers) of that edition to the public. It is requested, but not required, that you contact the authors of the Document well before redistributing any large number of copies, to give them a chance to provide you with an updated version of the Document. 4. MODIFICATIONS You may copy and distribute a Modified Version of the Document under the conditions of sections 2 and 3 above, provided that you release the Modified Version under precisely this License, with the Modified Version filling the role of the Document, thus licensing distribution and modification of the Modified Version to whoever possesses a copy of it. In addition, you must do these things in the Modified Version: A. Use in the Title Page (and on the covers, if any) a title distinct from that of the Document, and from those of previous versions (which should, if there were any, be listed in the History section of the Document). You may use the same title as a previous version if the original publisher of that version gives permission. B. List on the Title Page, as authors, one or more persons or entities responsible for authorship of the modifications in the Modified Version, together with at least five of the principal authors of the Document (all of its principal authors, if it has fewer than five), unless they release you from this requirement. C. State on the Title page the name of the publisher of the Modified Version, as the publisher. D. Preserve all the copyright notices of the Document. E. Add an appropriate copyright notice for your modifications adjacent to the other copyright notices. F. Include, immediately after the copyright notices, a license notice giving the public permission to use the Modified Version under the terms of this License, in the form shown in the Addendum below. G. Preserve in that license notice the full lists of Invariant Sections and required Cover Texts given in the Document’s license notice. H. Include an unaltered copy of this License. I. Preserve the section Entitled “History”, Preserve its Title, and add to it an item stating at least the title, year, new authors, and publisher of the Modified Version as given on the Title Page. If there is no section Entitled “History” in the Document, create one stating the title, year, authors, and publisher of the Document as given on its Title Page, then add an item describing the Modified Version as stated in the previous sentence. J. Preserve the network location, if any, given in the Document for public access to a Transparent copy of the Document, and likewise the network locations given in the Document for previous versions it was based on. These may be placed in the “History” section. You may omit a network location for a work that was published at least four years before the Document itself, or if the original publisher of the version it refers to gives permission. K. For any section Entitled “Acknowledgements” or “Dedications”, Preserve the Title of the section, and preserve in the section all the substance and tone of each of the contributor acknowledgements and/or dedications given therein. L. Preserve all the Invariant Sections of the Document, unaltered in their text and in their titles. Section numbers or the equivalent are not considered part of the section titles. M. Delete any section Entitled “Endorsements”. Such a section may not be included in the Modified Version. N. Do not retitle any existing section to be Entitled “Endorsements” or to conflict in title with any Invariant Section. O. Preserve any Warranty Disclaimers. If the Modified Version includes new front-matter sections or appendices that qualify as Secondary Sections and contain no material copied from the Document, you may at your option designate some or all of these sections as invariant. To do this, add their titles to the list of Invariant Sections in the Modified Version’s license notice. These titles must be distinct from any other section titles. You may add a section Entitled “Endorsements”, provided it contains nothing but endorsements of your Modified Version by various parties—for example, statements of peer review or that the text has been approved by an organization as the authoritative definition of a standard. You may add a passage of up to five words as a Front-Cover Text, and a passage of up to 25 words as a Back-Cover Text, to the end of the list of Cover Texts in the Modified Version. Only one passage of Front-Cover Text and one of Back-Cover Text may be added by (or through arrangements made by) any one entity. If the Document already includes a cover text for the same cover, previously added by you or by arrangement made by the same entity you are acting on behalf of, you may not add another; but you may replace the old one, on explicit permission from the previous publisher that added the old one. The author(s) and publisher(s) of the Document do not by this License give permission to use their names for publicity for or to assert or imply endorsement of any Modified Version. 5. COMBINING DOCUMENTS You may combine the Document with other documents released under this License, under the terms defined in section 4 above for modified versions, provided that you include in the combination all of the Invariant Sections of all of the original documents, unmodified, and list them all as Invariant Sections of your combined work in its license notice, and that you preserve all their Warranty Disclaimers. The combined work need only contain one copy of this License, and multiple identical Invariant Sections may be replaced with a single copy. If there are multiple Invariant Sections with the same name but different contents, make the title of each such section unique by adding at the end of it, in parentheses, the name of the original author or publisher of that section if known, or else a unique number. Make the same adjustment to the section titles in the list of Invariant Sections in the license notice of the combined work. In the combination, you must combine any sections Entitled “History” in the various original documents, forming one section Entitled “History”; likewise combine any sections Entitled “Acknowledgements”, and any sections Entitled “Dedications”. You must delete all sections Entitled “Endorsements.” 6. COLLECTIONS OF DOCUMENTS You may make a collection consisting of the Document and other documents released under this License, and replace the individual copies of this License in the various documents with a single copy that is included in the collection, provided that you follow the rules of this License for verbatim copying of each of the documents in all other respects. You may extract a single document from such a collection, and distribute it individually under this License, provided you insert a copy of this License into the extracted document, and follow this License in all other respects regarding verbatim copying of that document. 7. AGGREGATION WITH INDEPENDENT WORKS A compilation of the Document or its derivatives with other separate and independent documents or works, in or on a volume of a storage or distribution medium, is called an “aggregate” if the copyright resulting from the compilation is not used to limit the legal rights of the compilation’s users beyond what the individual works permit. When the Document is included in an aggregate, this License does not apply to the other works in the aggregate which are not themselves derivative works of the Document. If the Cover Text requirement of section 3 is applicable to these copies of the Document, then if the Document is less than one half of the entire aggregate, the Document’s Cover Texts may be placed on covers that bracket the Document within the aggregate, or the electronic equivalent of covers if the Document is in electronic form. Otherwise they must appear on printed covers that bracket the whole aggregate. 8. TRANSLATION Translation is considered a kind of modification, so you may distribute translations of the Document under the terms of section 4. Replacing Invariant Sections with translations requires special permission from their copyright holders, but you may include translations of some or all Invariant Sections in addition to the original versions of these Invariant Sections. You may include a translation of this License, and all the license notices in the Document, and any Warranty Disclaimers, provided that you also include the original English version of this License and the original versions of those notices and disclaimers. In case of a disagreement between the translation and the original version of this License or a notice or disclaimer, the original version will prevail. If a section in the Document is Entitled “Acknowledgements”, “Dedications”, or “History”, the requirement (section 4) to Preserve its Title (section 1) will typically require changing the actual title. 9. TERMINATION You may not copy, modify, sublicense, or distribute the Document except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense, or distribute it is void, and will automatically terminate your rights under this License. However, if you cease all violation of this License, then your license from a particular copyright holder is reinstated (a) provisionally, unless and until the copyright holder explicitly and finally terminates your license, and (b) permanently, if the copyright holder fails to notify you of the violation by some reasonable means prior to 60 days after the cessation. Moreover, your license from a particular copyright holder is reinstated permanently if the copyright holder notifies you of the violation by some reasonable means, this is the first time you have received notice of violation of this License (for any work) from that copyright holder, and you cure the violation prior to 30 days after your receipt of the notice. Termination of your rights under this section does not terminate the licenses of parties who have received copies or rights from you under this License. If your rights have been terminated and not permanently reinstated, receipt of a copy of some or all of the same material does not give you any rights to use it. 10. FUTURE REVISIONS OF THIS LICENSE The Free Software Foundation may publish new, revised versions of the GNU Free Documentation License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. See . Each version of the License is given a distinguishing version number. If the Document specifies that a particular numbered version of this License “or any later version” applies to it, you have the option of following the terms and conditions either of that specified version or of any later version that has been published (not as a draft) by the Free Software Foundation. If the Document does not specify a version number of this License, you may choose any version ever published (not as a draft) by the Free Software Foundation. If the Document specifies that a proxy can decide which future versions of this License can be used, that proxy’s public statement of acceptance of a version permanently authorizes you to choose that version for the Document. 11. RELICENSING “Massive Multiauthor Collaboration Site” (or “MMC Site”) means any World Wide Web server that publishes copyrightable works and also provides prominent facilities for anybody to edit those works. A public wiki that anybody can edit is an example of such a server. A “Massive Multiauthor Collaboration” (or “MMC”) contained in the site means any set of copyrightable works thus published on the MMC site. “CC-BY-SA” means the Creative Commons Attribution-Share Alike 3.0 license published by Creative Commons Corporation, a not-for-profit corporation with a principal place of business in San Francisco, California, as well as future copyleft versions of that license published by that same organization. “Incorporate” means to publish or republish a Document, in whole or in part, as part of another Document. An MMC is “eligible for relicensing” if it is licensed under this License, and if all works that were first published under this License somewhere other than this MMC, and subsequently incorporated in whole or in part into the MMC, (1) had no cover texts or invariant sections, and (2) were thus incorporated prior to November 1, 2008. The operator of an MMC Site may republish an MMC contained in the site under CC-BY-SA on the same site at any time before August 1, 2009, provided the MMC is eligible for relicensing. ADDENDUM: How to use this License for your documents ==================================================== To use this License in a document you have written, include a copy of the License in the document and put the following copyright and license notices just after the title page: Copyright (C) YEAR YOUR NAME. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled ``GNU Free Documentation License''. If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, replace the “with...Texts.” line with this: with the Invariant Sections being LIST THEIR TITLES, with the Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST. If you have Invariant Sections without Cover Texts, or some other combination of the three, merge those two alternatives to suit the situation. If your document contains nontrivial examples of program code, we recommend releasing these examples in parallel under your choice of free software license, such as the GNU General Public License, to permit their use in free software. Index ***** * Menu: * ambiguous width: uniwidth.h. (line 2814) * Arabic shaping: Arabic shaping. (line 2087) * argument conventions: Conventions. (line 414) * autoconf macro: Autoconf macro. (line 3996) * bidi class: Bidi class. (line 1907) * bidirectional category: Bidi class. (line 1907) * bidirectional reordering: More functionality. (line 4044) * block: Blocks. (line 2665) * boundaries, between grapheme clusters: unigbrk.h. (line 2849) * boundaries, between words: uniwbrk.h. (line 3003) * breaks, grapheme cluster: unigbrk.h. (line 2849) * breaks, line: unilbrk.h. (line 3072) * breaks, word: uniwbrk.h. (line 3003) * bug reports: Reporting problems. (line 4027) * bug tracker: Reporting problems. (line 4027) * C string functions: char * strings. (line 293) * C, programming language: ISO C and Java syntax. (line 2703) * C-like API: Classifications like in ISO C. (line 2746) * canonical combining class: Canonical combining class. (line 1797) * case detection: Case detection. (line 3845) * case mappings: Case mappings of strings. (line 3497) * casing_prefix_context_t: Case mappings of substrings. (line 3581) * casing_suffix_context_t: Case mappings of substrings. (line 3613) * char, type: char * strings. (line 309) * char16_t, type: The char32_t problem. (line 4097) * char32_t, type: The char32_t problem. (line 4097) * combining, Unicode characters: Composition of characters. (line 3276) * comparing: Comparing Unicode strings. (line 709) * comparing <1>: Comparing NUL terminated Unicode strings. (line 921) * comparing, ignoring case: Case insensitive comparison. (line 3726) * comparing, ignoring case, with collation rules: Case insensitive comparison. (line 3794) * comparing, ignoring normalization: Normalizing comparisons. (line 3346) * comparing, ignoring normalization and case: Case insensitive comparison. (line 3726) * comparing, ignoring normalization and case, with collation rules: Case insensitive comparison. (line 3794) * comparing, ignoring normalization, with collation rules: Normalizing comparisons. (line 3362) * comparing, with collation rules: Comparing NUL terminated Unicode strings. (line 934) * comparing, with collation rules, ignoring case: Case insensitive comparison. (line 3794) * comparing, with collation rules, ignoring normalization: Normalizing comparisons. (line 3362) * comparing, with collation rules, ignoring normalization and case: Case insensitive comparison. (line 3794) * compiler options: Compiler options. (line 3948) * composing, Unicode characters: Composition of characters. (line 3276) * converting: Elementary string conversions. (line 531) * converting <1>: uniconv.h. (line 1129) * copying: Copying Unicode strings. (line 658) * copying <1>: Copying a NUL terminated Unicode string. (line 849) * counting: Counting characters. (line 760) * decomposing: Decomposition of characters. (line 3175) * dependencies: Installation. (line 3919) * detecting case: Case detection. (line 3845) * duplicating: Elementary string functions with memory allocation. (line 774) * duplicating <1>: Duplicating a NUL terminated Unicode string. (line 963) * enum iconv_ilseq_handler: uniconv.h. (line 1107) * FDL, GNU Free Documentation License: GNU FDL. (line 5059) * formatted output: unistdio.h. (line 1267) * fullwidth: uniwidth.h. (line 2826) * general category: General category. (line 1494) * gl_LIBUNISTRING: Autoconf macro. (line 4001) * GPL, GNU General Public License: GNU GPL. (line 4178) * grapheme cluster boundaries: unigbrk.h. (line 2849) * grapheme cluster breaks: unigbrk.h. (line 2849) * halfwidth: uniwidth.h. (line 2826) * identifiers: ISO C and Java syntax. (line 2703) * Indic_Conjunct_Break: Indic conjunct break. (line 2596) * installation: Installation. (line 3923) * internationalization: Unicode and i18n. (line 184) * iterating: Iterating. (line 582) * iterating <1>: Iterating over a NUL terminated Unicode string. (line 796) * Java, programming language: ISO C and Java syntax. (line 2703) * joining group: Joining group. (line 2149) * joining of Arabic characters: Arabic shaping. (line 2087) * joining type: Joining type. (line 2095) * LGPL, GNU Lesser General Public License: GNU LGPL. (line 4890) * License, GNU FDL: GNU FDL. (line 5059) * License, GNU GPL: GNU GPL. (line 4178) * License, GNU LGPL: GNU LGPL. (line 4890) * Licenses: Licenses. (line 4139) * line breaks: unilbrk.h. (line 3072) * locale: Locale encodings. (line 216) * locale categories: Locale encodings. (line 220) * locale encoding: Locale encodings. (line 233) * locale encoding <1>: uniconv.h. (line 1088) * locale language: Case mappings of strings. (line 3507) * locale, multibyte: char * strings. (line 300) * locale_charset: uniconv.h. (line 1090) * lowercasing: Case mappings of strings. (line 3497) * mailing list: Reporting problems. (line 4027) * mirroring, of Unicode character: Mirrored character. (line 2063) * normal forms: uninorm.h. (line 3167) * normalizing: uninorm.h. (line 3167) * output, formatted: unistdio.h. (line 1267) * properties, of Unicode character: Properties. (line 2282) * regular expression: uniregex.h. (line 3907) * rendering: More functionality. (line 4047) * return value conventions: Conventions. (line 452) * scripts: Scripts. (line 2628) * searching, for a character: Searching for a character. (line 744) * searching, for a character <1>: Searching for a character in a NUL terminated Unicode string. (line 976) * searching, for a substring: Searching for a substring. (line 1035) * stream, normalizing a: Normalization of streams. (line 3395) * struct uninorm_filter: Normalization of streams. (line 3399) * titlecasing: Case mappings of strings. (line 3497) * u16_asnprintf: unistdio.h. (line 1373) * u16_asprintf: unistdio.h. (line 1371) * u16_casecmp: Case insensitive comparison. (line 3777) * u16_casecoll: Case insensitive comparison. (line 3823) * u16_casefold: Case insensitive comparison. (line 3732) * u16_casexfrm: Case insensitive comparison. (line 3800) * u16_casing_prefixes_context: Case mappings of substrings. (line 3604) * u16_casing_prefix_context: Case mappings of substrings. (line 3595) * u16_casing_suffixes_context: Case mappings of substrings. (line 3636) * u16_casing_suffix_context: Case mappings of substrings. (line 3627) * u16_check: Elementary string checks. (line 522) * u16_chr: Searching for a character. (line 747) * u16_cmp: Comparing Unicode strings. (line 714) * u16_cmp2: Comparing Unicode strings. (line 730) * u16_conv_from_encoding: uniconv.h. (line 1136) * u16_conv_to_encoding: uniconv.h. (line 1176) * u16_cpy: Copying Unicode strings. (line 662) * u16_cpy_alloc: Elementary string functions with memory allocation. (line 777) * u16_ct_casefold: Case insensitive comparison. (line 3755) * u16_ct_tolower: Case mappings of substrings. (line 3674) * u16_ct_totitle: Case mappings of substrings. (line 3695) * u16_ct_toupper: Case mappings of substrings. (line 3653) * u16_endswith: Searching for a substring. (line 1059) * u16_grapheme_breaks: Grapheme cluster breaks in a string. (line 2916) * u16_grapheme_next: Grapheme cluster breaks in a string. (line 2878) * u16_grapheme_prev: Grapheme cluster breaks in a string. (line 2894) * u16_is_cased: Case detection. (line 3894) * u16_is_casefolded: Case detection. (line 3881) * u16_is_lowercase: Case detection. (line 3861) * u16_is_titlecase: Case detection. (line 3871) * u16_is_uppercase: Case detection. (line 3851) * u16_mblen: Iterating. (line 586) * u16_mbsnlen: Counting characters. (line 763) * u16_mbtouc: Iterating. (line 596) * u16_mbtoucr: Iterating. (line 624) * u16_mbtouc_unsafe: Iterating. (line 615) * u16_move: Copying Unicode strings. (line 685) * u16_next: Iterating over a NUL terminated Unicode string. (line 804) * u16_normalize: Normalization of strings. (line 3334) * u16_normcmp: Normalizing comparisons. (line 3351) * u16_normcoll: Normalizing comparisons. (line 3380) * u16_normxfrm: Normalizing comparisons. (line 3364) * u16_pcpy: Copying Unicode strings. (line 673) * u16_possible_linebreaks: unilbrk.h. (line 3114) * u16_prev: Iterating over a NUL terminated Unicode string. (line 815) * u16_set: Copying Unicode strings. (line 698) * u16_snprintf: unistdio.h. (line 1369) * u16_sprintf: unistdio.h. (line 1368) * u16_startswith: Searching for a substring. (line 1051) * u16_stpcpy: Copying a NUL terminated Unicode string. (line 862) * u16_stpncpy: Copying a NUL terminated Unicode string. (line 885) * u16_strcat: Copying a NUL terminated Unicode string. (line 898) * u16_strchr: Searching for a character in a NUL terminated Unicode string. (line 979) * u16_strcmp: Comparing NUL terminated Unicode strings. (line 925) * u16_strcoll: Comparing NUL terminated Unicode strings. (line 935) * u16_strconv_from_encoding: uniconv.h. (line 1217) * u16_strconv_from_locale: uniconv.h. (line 1246) * u16_strconv_to_encoding: uniconv.h. (line 1230) * u16_strconv_to_locale: uniconv.h. (line 1256) * u16_strcpy: Copying a NUL terminated Unicode string. (line 852) * u16_strcspn: Searching for a character in a NUL terminated Unicode string. (line 999) * u16_strdup: Duplicating a NUL terminated Unicode string. (line 966) * u16_strlen: Length. (line 831) * u16_strmblen: Iterating over a NUL terminated Unicode string. (line 791) * u16_strmbtouc: Iterating over a NUL terminated Unicode string. (line 797) * u16_strncat: Copying a NUL terminated Unicode string. (line 909) * u16_strncmp: Comparing NUL terminated Unicode strings. (line 951) * u16_strncpy: Copying a NUL terminated Unicode string. (line 874) * u16_strnlen: Length. (line 839) * u16_strpbrk: Searching for a character in a NUL terminated Unicode string. (line 1023) * u16_strrchr: Searching for a character in a NUL terminated Unicode string. (line 987) * u16_strspn: Searching for a character in a NUL terminated Unicode string. (line 1011) * u16_strstr: Searching for a substring. (line 1040) * u16_strtok: Tokenizing. (line 1072) * u16_strwidth: uniwidth.h. (line 2842) * u16_tolower: Case mappings of strings. (line 3535) * u16_totitle: Case mappings of strings. (line 3552) * u16_toupper: Case mappings of strings. (line 3518) * u16_to_u32: Elementary string conversions. (line 555) * u16_to_u8: Elementary string conversions. (line 548) * u16_u16_asnprintf: unistdio.h. (line 1393) * u16_u16_asprintf: unistdio.h. (line 1391) * u16_u16_snprintf: unistdio.h. (line 1389) * u16_u16_sprintf: unistdio.h. (line 1387) * u16_u16_vasnprintf: unistdio.h. (line 1401) * u16_u16_vasprintf: unistdio.h. (line 1399) * u16_u16_vsnprintf: unistdio.h. (line 1397) * u16_u16_vsprintf: unistdio.h. (line 1395) * u16_uctomb: Creating Unicode strings. (line 644) * u16_vasnprintf: unistdio.h. (line 1381) * u16_vasprintf: unistdio.h. (line 1379) * u16_vsnprintf: unistdio.h. (line 1377) * u16_vsprintf: unistdio.h. (line 1375) * u16_width: uniwidth.h. (line 2833) * u16_width_linebreaks: unilbrk.h. (line 3132) * u16_wordbreaks: Word breaks in a string. (line 3015) * u32_asnprintf: unistdio.h. (line 1412) * u32_asprintf: unistdio.h. (line 1410) * u32_casecmp: Case insensitive comparison. (line 3780) * u32_casecoll: Case insensitive comparison. (line 3826) * u32_casefold: Case insensitive comparison. (line 3735) * u32_casexfrm: Case insensitive comparison. (line 3803) * u32_casing_prefixes_context: Case mappings of substrings. (line 3607) * u32_casing_prefix_context: Case mappings of substrings. (line 3597) * u32_casing_suffixes_context: Case mappings of substrings. (line 3639) * u32_casing_suffix_context: Case mappings of substrings. (line 3629) * u32_check: Elementary string checks. (line 523) * u32_chr: Searching for a character. (line 749) * u32_cmp: Comparing Unicode strings. (line 716) * u32_cmp2: Comparing Unicode strings. (line 732) * u32_conv_from_encoding: uniconv.h. (line 1140) * u32_conv_to_encoding: uniconv.h. (line 1180) * u32_cpy: Copying Unicode strings. (line 664) * u32_cpy_alloc: Elementary string functions with memory allocation. (line 778) * u32_ct_casefold: Case insensitive comparison. (line 3760) * u32_ct_tolower: Case mappings of substrings. (line 3679) * u32_ct_totitle: Case mappings of substrings. (line 3700) * u32_ct_toupper: Case mappings of substrings. (line 3658) * u32_endswith: Searching for a substring. (line 1061) * u32_grapheme_breaks: Grapheme cluster breaks in a string. (line 2918) * u32_grapheme_next: Grapheme cluster breaks in a string. (line 2880) * u32_grapheme_prev: Grapheme cluster breaks in a string. (line 2896) * u32_is_cased: Case detection. (line 3896) * u32_is_casefolded: Case detection. (line 3883) * u32_is_lowercase: Case detection. (line 3863) * u32_is_titlecase: Case detection. (line 3873) * u32_is_uppercase: Case detection. (line 3853) * u32_mblen: Iterating. (line 587) * u32_mbsnlen: Counting characters. (line 764) * u32_mbtouc: Iterating. (line 597) * u32_mbtoucr: Iterating. (line 625) * u32_mbtouc_unsafe: Iterating. (line 617) * u32_move: Copying Unicode strings. (line 687) * u32_next: Iterating over a NUL terminated Unicode string. (line 805) * u32_normalize: Normalization of strings. (line 3336) * u32_normcmp: Normalizing comparisons. (line 3353) * u32_normcoll: Normalizing comparisons. (line 3382) * u32_normxfrm: Normalizing comparisons. (line 3366) * u32_pcpy: Copying Unicode strings. (line 675) * u32_possible_linebreaks: unilbrk.h. (line 3116) * u32_prev: Iterating over a NUL terminated Unicode string. (line 817) * u32_set: Copying Unicode strings. (line 699) * u32_snprintf: unistdio.h. (line 1408) * u32_sprintf: unistdio.h. (line 1407) * u32_startswith: Searching for a substring. (line 1053) * u32_stpcpy: Copying a NUL terminated Unicode string. (line 864) * u32_stpncpy: Copying a NUL terminated Unicode string. (line 887) * u32_strcat: Copying a NUL terminated Unicode string. (line 900) * u32_strchr: Searching for a character in a NUL terminated Unicode string. (line 980) * u32_strcmp: Comparing NUL terminated Unicode strings. (line 926) * u32_strcoll: Comparing NUL terminated Unicode strings. (line 936) * u32_strconv_from_encoding: uniconv.h. (line 1219) * u32_strconv_from_locale: uniconv.h. (line 1247) * u32_strconv_to_encoding: uniconv.h. (line 1232) * u32_strconv_to_locale: uniconv.h. (line 1257) * u32_strcpy: Copying a NUL terminated Unicode string. (line 854) * u32_strcspn: Searching for a character in a NUL terminated Unicode string. (line 1001) * u32_strdup: Duplicating a NUL terminated Unicode string. (line 967) * u32_strlen: Length. (line 832) * u32_strmblen: Iterating over a NUL terminated Unicode string. (line 792) * u32_strmbtouc: Iterating over a NUL terminated Unicode string. (line 798) * u32_strncat: Copying a NUL terminated Unicode string. (line 911) * u32_strncmp: Comparing NUL terminated Unicode strings. (line 953) * u32_strncpy: Copying a NUL terminated Unicode string. (line 876) * u32_strnlen: Length. (line 840) * u32_strpbrk: Searching for a character in a NUL terminated Unicode string. (line 1025) * u32_strrchr: Searching for a character in a NUL terminated Unicode string. (line 988) * u32_strspn: Searching for a character in a NUL terminated Unicode string. (line 1013) * u32_strstr: Searching for a substring. (line 1042) * u32_strtok: Tokenizing. (line 1074) * u32_strwidth: uniwidth.h. (line 2843) * u32_tolower: Case mappings of strings. (line 3538) * u32_totitle: Case mappings of strings. (line 3555) * u32_toupper: Case mappings of strings. (line 3521) * u32_to_u16: Elementary string conversions. (line 569) * u32_to_u8: Elementary string conversions. (line 562) * u32_u32_asnprintf: unistdio.h. (line 1432) * u32_u32_asprintf: unistdio.h. (line 1430) * u32_u32_snprintf: unistdio.h. (line 1428) * u32_u32_sprintf: unistdio.h. (line 1426) * u32_u32_vasnprintf: unistdio.h. (line 1440) * u32_u32_vasprintf: unistdio.h. (line 1438) * u32_u32_vsnprintf: unistdio.h. (line 1436) * u32_u32_vsprintf: unistdio.h. (line 1434) * u32_uctomb: Creating Unicode strings. (line 645) * u32_vasnprintf: unistdio.h. (line 1420) * u32_vasprintf: unistdio.h. (line 1418) * u32_vsnprintf: unistdio.h. (line 1416) * u32_vsprintf: unistdio.h. (line 1414) * u32_width: uniwidth.h. (line 2835) * u32_width_linebreaks: unilbrk.h. (line 3135) * u32_wordbreaks: Word breaks in a string. (line 3016) * u8_asnprintf: unistdio.h. (line 1334) * u8_asprintf: unistdio.h. (line 1332) * u8_casecmp: Case insensitive comparison. (line 3774) * u8_casecoll: Case insensitive comparison. (line 3820) * u8_casefold: Case insensitive comparison. (line 3729) * u8_casexfrm: Case insensitive comparison. (line 3797) * u8_casing_prefixes_context: Case mappings of substrings. (line 3601) * u8_casing_prefix_context: Case mappings of substrings. (line 3593) * u8_casing_suffixes_context: Case mappings of substrings. (line 3633) * u8_casing_suffix_context: Case mappings of substrings. (line 3625) * u8_check: Elementary string checks. (line 521) * u8_chr: Searching for a character. (line 746) * u8_cmp: Comparing Unicode strings. (line 712) * u8_cmp2: Comparing Unicode strings. (line 728) * u8_conv_from_encoding: uniconv.h. (line 1132) * u8_conv_to_encoding: uniconv.h. (line 1172) * u8_cpy: Copying Unicode strings. (line 660) * u8_cpy_alloc: Elementary string functions with memory allocation. (line 776) * u8_ct_casefold: Case insensitive comparison. (line 3750) * u8_ct_tolower: Case mappings of substrings. (line 3669) * u8_ct_totitle: Case mappings of substrings. (line 3690) * u8_ct_toupper: Case mappings of substrings. (line 3648) * u8_endswith: Searching for a substring. (line 1057) * u8_grapheme_breaks: Grapheme cluster breaks in a string. (line 2914) * u8_grapheme_next: Grapheme cluster breaks in a string. (line 2876) * u8_grapheme_prev: Grapheme cluster breaks in a string. (line 2892) * u8_is_cased: Case detection. (line 3892) * u8_is_casefolded: Case detection. (line 3879) * u8_is_lowercase: Case detection. (line 3859) * u8_is_titlecase: Case detection. (line 3869) * u8_is_uppercase: Case detection. (line 3849) * u8_mblen: Iterating. (line 585) * u8_mbsnlen: Counting characters. (line 762) * u8_mbtouc: Iterating. (line 595) * u8_mbtoucr: Iterating. (line 623) * u8_mbtouc_unsafe: Iterating. (line 613) * u8_move: Copying Unicode strings. (line 683) * u8_next: Iterating over a NUL terminated Unicode string. (line 803) * u8_normalize: Normalization of strings. (line 3332) * u8_normcmp: Normalizing comparisons. (line 3349) * u8_normcoll: Normalizing comparisons. (line 3378) * u8_normxfrm: Normalizing comparisons. (line 3362) * u8_pcpy: Copying Unicode strings. (line 671) * u8_possible_linebreaks: unilbrk.h. (line 3112) * u8_prev: Iterating over a NUL terminated Unicode string. (line 813) * u8_set: Copying Unicode strings. (line 697) * u8_snprintf: unistdio.h. (line 1330) * u8_sprintf: unistdio.h. (line 1329) * u8_startswith: Searching for a substring. (line 1049) * u8_stpcpy: Copying a NUL terminated Unicode string. (line 861) * u8_stpncpy: Copying a NUL terminated Unicode string. (line 883) * u8_strcat: Copying a NUL terminated Unicode string. (line 897) * u8_strchr: Searching for a character in a NUL terminated Unicode string. (line 978) * u8_strcmp: Comparing NUL terminated Unicode strings. (line 924) * u8_strcoll: Comparing NUL terminated Unicode strings. (line 934) * u8_strconv_from_encoding: uniconv.h. (line 1215) * u8_strconv_from_locale: uniconv.h. (line 1245) * u8_strconv_to_encoding: uniconv.h. (line 1228) * u8_strconv_to_locale: uniconv.h. (line 1255) * u8_strcpy: Copying a NUL terminated Unicode string. (line 851) * u8_strcspn: Searching for a character in a NUL terminated Unicode string. (line 997) * u8_strdup: Duplicating a NUL terminated Unicode string. (line 965) * u8_strlen: Length. (line 830) * u8_strmblen: Iterating over a NUL terminated Unicode string. (line 790) * u8_strmbtouc: Iterating over a NUL terminated Unicode string. (line 796) * u8_strncat: Copying a NUL terminated Unicode string. (line 907) * u8_strncmp: Comparing NUL terminated Unicode strings. (line 949) * u8_strncpy: Copying a NUL terminated Unicode string. (line 872) * u8_strnlen: Length. (line 838) * u8_strpbrk: Searching for a character in a NUL terminated Unicode string. (line 1021) * u8_strrchr: Searching for a character in a NUL terminated Unicode string. (line 986) * u8_strspn: Searching for a character in a NUL terminated Unicode string. (line 1009) * u8_strstr: Searching for a substring. (line 1038) * u8_strtok: Tokenizing. (line 1070) * u8_strwidth: uniwidth.h. (line 2841) * u8_tolower: Case mappings of strings. (line 3532) * u8_totitle: Case mappings of strings. (line 3549) * u8_toupper: Case mappings of strings. (line 3515) * u8_to_u16: Elementary string conversions. (line 534) * u8_to_u32: Elementary string conversions. (line 541) * u8_u8_asnprintf: unistdio.h. (line 1354) * u8_u8_asprintf: unistdio.h. (line 1352) * u8_u8_snprintf: unistdio.h. (line 1350) * u8_u8_sprintf: unistdio.h. (line 1348) * u8_u8_vasnprintf: unistdio.h. (line 1362) * u8_u8_vasprintf: unistdio.h. (line 1360) * u8_u8_vsnprintf: unistdio.h. (line 1358) * u8_u8_vsprintf: unistdio.h. (line 1356) * u8_uctomb: Creating Unicode strings. (line 643) * u8_vasnprintf: unistdio.h. (line 1342) * u8_vasprintf: unistdio.h. (line 1340) * u8_vsnprintf: unistdio.h. (line 1338) * u8_vsprintf: unistdio.h. (line 1336) * u8_width: uniwidth.h. (line 2831) * u8_width_linebreaks: unilbrk.h. (line 3129) * u8_wordbreaks: Word breaks in a string. (line 3014) * UCS-4: Unicode. (line 153) * ucs4_t: unitypes.h. (line 497) * uc_all_blocks: Blocks. (line 2695) * uc_all_scripts: Scripts. (line 2657) * uc_bidi_category: Bidi class. (line 2006) * uc_bidi_category_byname: Bidi class. (line 1996) * uc_bidi_category_name: Bidi class. (line 1988) * uc_bidi_class: Bidi class. (line 2005) * uc_bidi_class_byname: Bidi class. (line 1995) * uc_bidi_class_long_name: Bidi class. (line 1992) * uc_bidi_class_name: Bidi class. (line 1987) * uc_block: Blocks. (line 2685) * uc_block_t: Blocks. (line 2670) * uc_canonical_decomposition: Decomposition of characters. (line 3259) * uc_combining_class: Canonical combining class. (line 1901) * uc_combining_class_byname: Canonical combining class. (line 1892) * uc_combining_class_long_name: Canonical combining class. (line 1888) * uc_combining_class_name: Canonical combining class. (line 1883) * uc_composition: Composition of characters. (line 3279) * uc_c_ident_category: ISO C and Java syntax. (line 2735) * uc_decimal_value: Decimal digit value. (line 2020) * uc_decomposition: Decomposition of characters. (line 3249) * uc_digit_value: Digit value. (line 2032) * uc_fraction_t: Numeric value. (line 2046) * uc_general_category: Object oriented API. (line 1727) * uc_general_category_and: Object oriented API. (line 1688) * uc_general_category_and_not: Object oriented API. (line 1695) * uc_general_category_byname: Object oriented API. (line 1717) * uc_general_category_long_name: Object oriented API. (line 1711) * uc_general_category_name: Object oriented API. (line 1705) * uc_general_category_or: Object oriented API. (line 1682) * uc_general_category_t: Object oriented API. (line 1512) * uc_graphemeclusterbreak_property: Grapheme cluster break property. (line 2977) * uc_grapheme_breaks: Grapheme cluster breaks in a string. (line 2922) * uc_indic_conjunct_break: Indic conjunct break. (line 2622) * uc_indic_conjunct_break_byname: Indic conjunct break. (line 2613) * uc_indic_conjunct_break_name: Indic conjunct break. (line 2609) * uc_is_alnum: Classifications like in ISO C. (line 2753) * uc_is_alpha: Classifications like in ISO C. (line 2757) * uc_is_bidi_category: Bidi class. (line 2010) * uc_is_bidi_class: Bidi class. (line 2009) * uc_is_blank: Classifications like in ISO C. (line 2803) * uc_is_block: Blocks. (line 2690) * uc_is_cntrl: Classifications like in ISO C. (line 2763) * uc_is_c_whitespace: ISO C and Java syntax. (line 2706) * uc_is_digit: Classifications like in ISO C. (line 2766) * uc_is_general_category: Object oriented API. (line 1732) * uc_is_general_category_withtable: Bit mask API. (line 1786) * uc_is_graph: Classifications like in ISO C. (line 2770) * uc_is_grapheme_break: Grapheme cluster break property. (line 2984) * uc_is_java_whitespace: ISO C and Java syntax. (line 2710) * uc_is_lower: Classifications like in ISO C. (line 2774) * uc_is_print: Classifications like in ISO C. (line 2780) * uc_is_property: Properties as objects. (line 2454) * uc_is_property_alphabetic: Properties as functions. (line 2463) * uc_is_property_ascii_hex_digit: Properties as functions. (line 2537) * uc_is_property_bidi_arabic_digit: Properties as functions. (line 2523) * uc_is_property_bidi_arabic_right_to_left: Properties as functions. (line 2519) * uc_is_property_bidi_block_separator: Properties as functions. (line 2525) * uc_is_property_bidi_boundary_neutral: Properties as functions. (line 2529) * uc_is_property_bidi_common_separator: Properties as functions. (line 2524) * uc_is_property_bidi_control: Properties as functions. (line 2516) * uc_is_property_bidi_embedding_or_override: Properties as functions. (line 2531) * uc_is_property_bidi_european_digit: Properties as functions. (line 2520) * uc_is_property_bidi_eur_num_separator: Properties as functions. (line 2521) * uc_is_property_bidi_eur_num_terminator: Properties as functions. (line 2522) * uc_is_property_bidi_hebrew_right_to_left: Properties as functions. (line 2518) * uc_is_property_bidi_left_to_right: Properties as functions. (line 2517) * uc_is_property_bidi_non_spacing_mark: Properties as functions. (line 2528) * uc_is_property_bidi_other_neutral: Properties as functions. (line 2532) * uc_is_property_bidi_pdf: Properties as functions. (line 2530) * uc_is_property_bidi_segment_separator: Properties as functions. (line 2526) * uc_is_property_bidi_whitespace: Properties as functions. (line 2527) * uc_is_property_cased: Properties as functions. (line 2483) * uc_is_property_case_ignorable: Properties as functions. (line 2484) * uc_is_property_changes_when_casefolded: Properties as functions. (line 2488) * uc_is_property_changes_when_casemapped: Properties as functions. (line 2489) * uc_is_property_changes_when_lowercased: Properties as functions. (line 2485) * uc_is_property_changes_when_titlecased: Properties as functions. (line 2487) * uc_is_property_changes_when_uppercased: Properties as functions. (line 2486) * uc_is_property_combining: Properties as functions. (line 2579) * uc_is_property_composite: Properties as functions. (line 2580) * uc_is_property_currency_symbol: Properties as functions. (line 2574) * uc_is_property_dash: Properties as functions. (line 2566) * uc_is_property_decimal_digit: Properties as functions. (line 2581) * uc_is_property_default_ignorable_code_point: Properties as functions. (line 2466) * uc_is_property_deprecated: Properties as functions. (line 2470) * uc_is_property_diacritic: Properties as functions. (line 2583) * uc_is_property_emoji: Properties as functions. (line 2550) * uc_is_property_emoji_component: Properties as functions. (line 2554) * uc_is_property_emoji_modifier: Properties as functions. (line 2552) * uc_is_property_emoji_modifier_base: Properties as functions. (line 2553) * uc_is_property_emoji_presentation: Properties as functions. (line 2551) * uc_is_property_extended_pictographic: Properties as functions. (line 2555) * uc_is_property_extender: Properties as functions. (line 2584) * uc_is_property_format_control: Properties as functions. (line 2563) * uc_is_property_grapheme_base: Properties as functions. (line 2508) * uc_is_property_grapheme_extend: Properties as functions. (line 2509) * uc_is_property_grapheme_link: Properties as functions. (line 2511) * uc_is_property_hex_digit: Properties as functions. (line 2536) * uc_is_property_hyphen: Properties as functions. (line 2567) * uc_is_property_ideographic: Properties as functions. (line 2541) * uc_is_property_ids_binary_operator: Properties as functions. (line 2545) * uc_is_property_ids_trinary_operator: Properties as functions. (line 2546) * uc_is_property_ids_unary_operator: Properties as functions. (line 2544) * uc_is_property_id_compat_math_continue: Properties as functions. (line 2501) * uc_is_property_id_compat_math_start: Properties as functions. (line 2500) * uc_is_property_id_continue: Properties as functions. (line 2496) * uc_is_property_id_start: Properties as functions. (line 2494) * uc_is_property_ignorable_control: Properties as functions. (line 2585) * uc_is_property_iso_control: Properties as functions. (line 2562) * uc_is_property_join_control: Properties as functions. (line 2507) * uc_is_property_left_of_pair: Properties as functions. (line 2578) * uc_is_property_line_separator: Properties as functions. (line 2569) * uc_is_property_logical_order_exception: Properties as functions. (line 2471) * uc_is_property_lowercase: Properties as functions. (line 2480) * uc_is_property_math: Properties as functions. (line 2575) * uc_is_property_modifier_combining_mark: Properties as functions. (line 2512) * uc_is_property_non_break: Properties as functions. (line 2561) * uc_is_property_not_a_character: Properties as functions. (line 2465) * uc_is_property_numeric: Properties as functions. (line 2582) * uc_is_property_other_alphabetic: Properties as functions. (line 2464) * uc_is_property_other_default_ignorable_code_point: Properties as functions. (line 2468) * uc_is_property_other_grapheme_extend: Properties as functions. (line 2510) * uc_is_property_other_id_continue: Properties as functions. (line 2497) * uc_is_property_other_id_start: Properties as functions. (line 2495) * uc_is_property_other_lowercase: Properties as functions. (line 2481) * uc_is_property_other_math: Properties as functions. (line 2576) * uc_is_property_other_uppercase: Properties as functions. (line 2479) * uc_is_property_paired_punctuation: Properties as functions. (line 2577) * uc_is_property_paragraph_separator: Properties as functions. (line 2570) * uc_is_property_pattern_syntax: Properties as functions. (line 2503) * uc_is_property_pattern_white_space: Properties as functions. (line 2502) * uc_is_property_prepended_concatenation_mark: Properties as functions. (line 2564) * uc_is_property_private_use: Properties as functions. (line 2473) * uc_is_property_punctuation: Properties as functions. (line 2568) * uc_is_property_quotation_mark: Properties as functions. (line 2571) * uc_is_property_radical: Properties as functions. (line 2543) * uc_is_property_regional_indicator: Properties as functions. (line 2586) * uc_is_property_sentence_terminal: Properties as functions. (line 2572) * uc_is_property_soft_dotted: Properties as functions. (line 2490) * uc_is_property_space: Properties as functions. (line 2560) * uc_is_property_terminal_punctuation: Properties as functions. (line 2573) * uc_is_property_titlecase: Properties as functions. (line 2482) * uc_is_property_unassigned_code_value: Properties as functions. (line 2474) * uc_is_property_unified_ideograph: Properties as functions. (line 2542) * uc_is_property_uppercase: Properties as functions. (line 2478) * uc_is_property_variation_selector: Properties as functions. (line 2472) * uc_is_property_white_space: Properties as functions. (line 2462) * uc_is_property_xid_continue: Properties as functions. (line 2499) * uc_is_property_xid_start: Properties as functions. (line 2498) * uc_is_property_zero_width: Properties as functions. (line 2559) * uc_is_punct: Classifications like in ISO C. (line 2783) * uc_is_script: Scripts. (line 2652) * uc_is_space: Classifications like in ISO C. (line 2788) * uc_is_upper: Classifications like in ISO C. (line 2793) * uc_is_xdigit: Classifications like in ISO C. (line 2799) * uc_java_ident_category: ISO C and Java syntax. (line 2739) * uc_joining_group: Joining group. (line 2276) * uc_joining_group_byname: Joining group. (line 2267) * uc_joining_group_name: Joining group. (line 2264) * uc_joining_type: Joining type. (line 2143) * uc_joining_type_byname: Joining type. (line 2134) * uc_joining_type_long_name: Joining type. (line 2131) * uc_joining_type_name: Joining type. (line 2128) * uc_locale_language: Case mappings of strings. (line 3511) * uc_mirror_char: Mirrored character. (line 2070) * uc_numeric_value: Numeric value. (line 2055) * uc_property_byname: Properties as objects. (line 2432) * uc_property_is_valid: Properties as objects. (line 2447) * uc_property_t: Properties as objects. (line 2297) * uc_script: Scripts. (line 2641) * uc_script_byname: Scripts. (line 2645) * uc_script_t: Scripts. (line 2632) * uc_tolower: Case mappings of characters. (line 3464) * uc_totitle: Case mappings of characters. (line 3467) * uc_toupper: Case mappings of characters. (line 3461) * uc_width: uniwidth.h. (line 2826) * uc_wordbreak_property: Word break property. (line 3067) * uint16_t: unitypes.h. (line 491) * uint32_t: unitypes.h. (line 492) * uint8_t: unitypes.h. (line 490) * ulc_asnprintf: unistdio.h. (line 1311) * ulc_asprintf: unistdio.h. (line 1309) * ulc_casecmp: Case insensitive comparison. (line 3783) * ulc_casecoll: Case insensitive comparison. (line 3829) * ulc_casexfrm: Case insensitive comparison. (line 3806) * ulc_fprintf: unistdio.h. (line 1446) * ulc_grapheme_breaks: Grapheme cluster breaks in a string. (line 2920) * ulc_possible_linebreaks: unilbrk.h. (line 3118) * ulc_snprintf: unistdio.h. (line 1306) * ulc_sprintf: unistdio.h. (line 1304) * ulc_vasnprintf: unistdio.h. (line 1323) * ulc_vasprintf: unistdio.h. (line 1320) * ulc_vfprintf: unistdio.h. (line 1447) * ulc_vsnprintf: unistdio.h. (line 1317) * ulc_vsprintf: unistdio.h. (line 1314) * ulc_width_linebreaks: unilbrk.h. (line 3138) * ulc_wordbreaks: Word breaks in a string. (line 3017) * Unicode: Unicode. (line 145) * Unicode character, bidi class: Bidi class. (line 1907) * Unicode character, bidirectional category: Bidi class. (line 1907) * Unicode character, block: Blocks. (line 2683) * Unicode character, canonical combining class: Canonical combining class. (line 1797) * Unicode character, case mappings: Case mappings of characters. (line 3451) * Unicode character, classification: General category. (line 1494) * Unicode character, classification like in C: Classifications like in ISO C. (line 2746) * Unicode character, general category: General category. (line 1494) * Unicode character, mirroring: Mirrored character. (line 2063) * Unicode character, name: uniname.h. (line 1452) * Unicode character, properties: Properties. (line 2282) * Unicode character, script: Scripts. (line 2639) * Unicode character, validity in C identifiers: ISO C and Java syntax. (line 2735) * Unicode character, validity in Java identifiers: ISO C and Java syntax. (line 2739) * Unicode character, value: Decimal digit value. (line 2016) * Unicode character, value <1>: Digit value. (line 2028) * Unicode character, value <2>: Numeric value. (line 2040) * Unicode character, width: uniwidth.h. (line 2826) * unicode_character_name: uniname.h. (line 1464) * unicode_name_character: uniname.h. (line 1470) * uninorm_decomposing_form: Normalization of strings. (line 3325) * uninorm_filter_create: Normalization of streams. (line 3405) * uninorm_filter_flush: Normalization of streams. (line 3421) * uninorm_filter_free: Normalization of streams. (line 3431) * uninorm_filter_write: Normalization of streams. (line 3416) * uninorm_is_compat_decomposing: Normalization of strings. (line 3317) * uninorm_is_composing: Normalization of strings. (line 3321) * uninorm_t: Normalization of strings. (line 3295) * uppercasing: Case mappings of strings. (line 3497) * use cases: Introduction. (line 128) * UTF-16: Unicode. (line 153) * UTF-16, strings: Unicode strings. (line 389) * UTF-32: Unicode. (line 153) * UTF-32, strings: Unicode strings. (line 389) * UTF-8: Unicode. (line 153) * UTF-8, strings: Unicode strings. (line 389) * validity: Elementary string checks. (line 518) * value, of libunistring: Introduction. (line 128) * value, of Unicode character: Decimal digit value. (line 2016) * value, of Unicode character <1>: Digit value. (line 2028) * value, of Unicode character <2>: Numeric value. (line 2040) * verification: Elementary string checks. (line 518) * wchar_t, type: The wchar_t mess. (line 4054) * well-formed: Elementary string checks. (line 518) * width: uniwidth.h. (line 2810) * word boundaries: uniwbrk.h. (line 3003) * word breaks: uniwbrk.h. (line 3003) * wrapping: unilbrk.h. (line 3072)