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utf8proc/utf8proc.h
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jan.nijtmans
Update to Unicode 18.0.0 (draft)
19 май 2026, 11:25
19 май 2026, 11:25
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/* * Copyright (c) 2014-2021 Steven G. Johnson, Jiahao Chen, Peter Colberg, Tony Kelman, Scott P. Jones, and other contributors. * Copyright (c) 2009 Public Software Group e. V., Berlin, Germany * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ /** * @mainpage * * utf8proc is a free/open-source (MIT/expat licensed) C library * providing Unicode normalization, case-folding, and other operations * for strings in the UTF-8 encoding, supporting up-to-date Unicode versions. * See the utf8proc home page (http://julialang.org/utf8proc/) * for downloads and other information, or the source code on github * (https://github.com/JuliaLang/utf8proc). * * For the utf8proc API documentation, see: @ref utf8proc.h * * The features of utf8proc include: * * - Transformation of strings (utf8proc_map()) to: * - decompose (@ref UTF8PROC_DECOMPOSE) or compose (@ref UTF8PROC_COMPOSE) Unicode combining characters (http://en.wikipedia.org/wiki/Combining_character) * - canonicalize Unicode compatibility characters (@ref UTF8PROC_COMPAT) * - strip "ignorable" (@ref UTF8PROC_IGNORE) characters, control characters (@ref UTF8PROC_STRIPCC), or combining characters such as accents (@ref UTF8PROC_STRIPMARK) * - case-folding (@ref UTF8PROC_CASEFOLD) * - Unicode normalization: utf8proc_NFD(), utf8proc_NFC(), utf8proc_NFKD(), utf8proc_NFKC() * - Detecting grapheme boundaries (utf8proc_grapheme_break() and @ref UTF8PROC_CHARBOUND) * - Character-width computation: utf8proc_charwidth() * - Classification of characters by Unicode category: utf8proc_category() and utf8proc_category_string() * - Encode (utf8proc_encode_char()) and decode (utf8proc_iterate()) Unicode codepoints to/from UTF-8. */ /** @file */ #ifndef UTF8PROC_H #define UTF8PROC_H /** @name API version * * The utf8proc API version MAJOR.MINOR.PATCH, following * semantic-versioning rules (http://semver.org) based on API * compatibility. * * This is also returned at runtime by utf8proc_version(); however, the * runtime version may append a string like "-dev" to the version number * for prerelease versions. * * @note The shared-library version number in the Makefile * (and CMakeLists.txt, and MANIFEST) may be different, * being based on ABI compatibility rather than API compatibility. */ /** @{ */ /** The MAJOR version number (increased when backwards API compatibility is broken). */ #define UTF8PROC_VERSION_MAJOR 2 /** The MINOR version number (increased when new functionality is added in a backwards-compatible manner). */ #define UTF8PROC_VERSION_MINOR 11 /** The PATCH version (increased for fixes that do not change the API). */ #define UTF8PROC_VERSION_PATCH 3 /** @} */ #include <stdlib.h> #if defined(_MSC_VER) && _MSC_VER < 1800 // MSVC prior to 2013 lacked stdbool.h and stdint.h typedef signed char utf8proc_int8_t; typedef unsigned char utf8proc_uint8_t; typedef short utf8proc_int16_t; typedef unsigned short utf8proc_uint16_t; typedef int utf8proc_int32_t; typedef unsigned int utf8proc_uint32_t; # ifdef _WIN64 typedef __int64 utf8proc_ssize_t; typedef unsigned __int64 utf8proc_size_t; # else typedef int utf8proc_ssize_t; typedef unsigned int utf8proc_size_t; # endif # ifndef __cplusplus // emulate C99 bool typedef unsigned char utf8proc_bool; # ifndef __bool_true_false_are_defined # define false 0 # define true 1 # define __bool_true_false_are_defined 1 # endif # else typedef bool utf8proc_bool; # endif #else # include <stddef.h> # include <stdbool.h> # include <stdint.h> typedef int8_t utf8proc_int8_t; typedef uint8_t utf8proc_uint8_t; typedef int16_t utf8proc_int16_t; typedef uint16_t utf8proc_uint16_t; typedef int32_t utf8proc_int32_t; typedef uint32_t utf8proc_uint32_t; typedef size_t utf8proc_size_t; typedef ptrdiff_t utf8proc_ssize_t; typedef bool utf8proc_bool; #endif #include <limits.h> #ifdef UTF8PROC_STATIC # ifndef UTF8PROC_DLLEXPORT # define UTF8PROC_DLLEXPORT # endif #else # ifdef _WIN32 # ifdef UTF8PROC_EXPORTS # define UTF8PROC_DLLEXPORT __declspec(dllexport) # else # define UTF8PROC_DLLEXPORT __declspec(dllimport) # endif # elif __GNUC__ >= 4 # define UTF8PROC_DLLEXPORT __attribute__ ((visibility("default"))) # else # define UTF8PROC_DLLEXPORT # endif #endif #ifdef __cplusplus extern "C" { #endif /** * Option flags used by several functions in the library. */ typedef enum { /** The given UTF-8 input is NULL terminated. */ UTF8PROC_NULLTERM = (1<<0), /** Unicode Versioning Stability has to be respected. */ UTF8PROC_STABLE = (1<<1), /** Compatibility decomposition (i.e. formatting information is lost). */ UTF8PROC_COMPAT = (1<<2), /** Return a result with composed characters. */ UTF8PROC_COMPOSE = (1<<3), /** Return a result with decomposed characters. */ UTF8PROC_DECOMPOSE = (1<<4), /** Strip "default ignorable characters" such as SOFT-HYPHEN or ZERO-WIDTH-SPACE. */ UTF8PROC_IGNORE = (1<<5), /** Return an error, if the input contains unassigned codepoints. */ UTF8PROC_REJECTNA = (1<<6), /** * Indicating that NLF-sequences (LF, CRLF, CR, NEL) are representing a * line break, and should be converted to the codepoint for line * separation (LS). */ UTF8PROC_NLF2LS = (1<<7), /** * Indicating that NLF-sequences are representing a paragraph break, and * should be converted to the codepoint for paragraph separation * (PS). */ UTF8PROC_NLF2PS = (1<<8), /** Indicating that the meaning of NLF-sequences is unknown. */ UTF8PROC_NLF2LF = (UTF8PROC_NLF2LS | UTF8PROC_NLF2PS), /** Strips and/or convers control characters. * * NLF-sequences are transformed into space, except if one of the * NLF2LS/PS/LF options is given. HorizontalTab (HT) and FormFeed (FF) * are treated as a NLF-sequence in this case. All other control * characters are simply removed. */ UTF8PROC_STRIPCC = (1<<9), /** * Performs unicode case folding, to be able to do a case-insensitive * string comparison. */ UTF8PROC_CASEFOLD = (1<<10), /** * Inserts 0xFF bytes at the beginning of each sequence which is * representing a single grapheme cluster (see UAX#29). */ UTF8PROC_CHARBOUND = (1<<11), /** Lumps certain characters together. * * E.g. HYPHEN U+2010 and MINUS U+2212 to ASCII "-". See lump.md for details. * * If NLF2LF is set, this includes a transformation of paragraph and * line separators to ASCII line-feed (LF). */ UTF8PROC_LUMP = (1<<12), /** Strips all character markings. * * This includes non-spacing, spacing and enclosing (i.e. accents). * @note This option works only with @ref UTF8PROC_COMPOSE or * @ref UTF8PROC_DECOMPOSE */ UTF8PROC_STRIPMARK = (1<<13), /** * Strip unassigned codepoints. */ UTF8PROC_STRIPNA = (1<<14), } utf8proc_option_t; /** @name Error codes * Error codes being returned by almost all functions. */ /** @{ */ /** Memory could not be allocated. */ #define UTF8PROC_ERROR_NOMEM -1 /** The given string is too long to be processed. */ #define UTF8PROC_ERROR_OVERFLOW -2 /** The given string is not a legal UTF-8 string. */ #define UTF8PROC_ERROR_INVALIDUTF8 -3 /** The @ref UTF8PROC_REJECTNA flag was set and an unassigned codepoint was found. */ #define UTF8PROC_ERROR_NOTASSIGNED -4 /** Invalid options have been used. */ #define UTF8PROC_ERROR_INVALIDOPTS -5 /** @} */ /* @name Types */ /** Holds the value of a property. */ typedef utf8proc_int16_t utf8proc_propval_t; /** Struct containing information about a codepoint. */ typedef struct utf8proc_property_struct { /** * Unicode category. * @see utf8proc_category_t. */ utf8proc_propval_t category; utf8proc_propval_t combining_class; /** * Bidirectional class. * @see utf8proc_bidi_class_t. */ utf8proc_propval_t bidi_class; /** * @anchor Decomposition type. * @see utf8proc_decomp_type_t. */ utf8proc_propval_t decomp_type; utf8proc_uint16_t decomp_seqindex; utf8proc_uint16_t casefold_seqindex; utf8proc_uint16_t uppercase_seqindex; utf8proc_uint16_t lowercase_seqindex; utf8proc_uint16_t titlecase_seqindex; /** * Character combining table. * * The character combining table is formally indexed by two * characters, the first and second character that might form a * combining pair. The table entry then contains the combined * character. Most character pairs cannot be combined. There are * about 1,000 characters that can be the first character in a * combining pair, and for most, there are only a handful for * possible second characters. * * The combining table is stored as sparse matrix in the CSR * (compressed sparse row) format. That is, it is stored as two * arrays, `utf8proc_uint32_t utf8proc_combinations_second[]` and * `utf8proc_uint32_t utf8proc_combinations_combined[]`. These * contain the second combining characters and the combined * character of every combining pair. * * - `comb_index`: Index into the combining table if this character * is the first character in a combining pair, else 0x3ff * * - `comb_length`: Number of table entries for this first character * * - `comb_is_second`: As optimization we also record whether this * character is the second combining character in any pair. If * not, we can skip the table lookup. * * A table lookup starts from a given character pair. It first * checks whether the first character is stored in the table * (checking whether the index is 0x3ff) and whether the second * index is stored in the table (looking at `comb_is_second`). If * so, the `comb_length` table entries will be checked sequentially * for a match. */ utf8proc_uint16_t comb_index:10; utf8proc_uint16_t comb_length:5; utf8proc_uint16_t comb_issecond:1; unsigned bidi_mirrored:1; unsigned comp_exclusion:1; /** * Can this codepoint be ignored? * * Used by utf8proc_decompose_char() when @ref UTF8PROC_IGNORE is * passed as an option. */ unsigned ignorable:1; unsigned control_boundary:1; /** The width of the codepoint. */ unsigned charwidth:2; /** East Asian width class A */ unsigned ambiguous_width:1; unsigned pad:1; /** * Boundclass. * @see utf8proc_boundclass_t. */ unsigned boundclass:6; unsigned indic_conjunct_break:2; } utf8proc_property_t; /** Unicode categories. */ typedef enum { UTF8PROC_CATEGORY_CN = 0, /**< Other, not assigned */ UTF8PROC_CATEGORY_LU = 1, /**< Letter, uppercase */ UTF8PROC_CATEGORY_LL = 2, /**< Letter, lowercase */ UTF8PROC_CATEGORY_LT = 3, /**< Letter, titlecase */ UTF8PROC_CATEGORY_LM = 4, /**< Letter, modifier */ UTF8PROC_CATEGORY_LO = 5, /**< Letter, other */ UTF8PROC_CATEGORY_MN = 6, /**< Mark, nonspacing */ UTF8PROC_CATEGORY_MC = 7, /**< Mark, spacing combining */ UTF8PROC_CATEGORY_ME = 8, /**< Mark, enclosing */ UTF8PROC_CATEGORY_ND = 9, /**< Number, decimal digit */ UTF8PROC_CATEGORY_NL = 10, /**< Number, letter */ UTF8PROC_CATEGORY_NO = 11, /**< Number, other */ UTF8PROC_CATEGORY_PC = 12, /**< Punctuation, connector */ UTF8PROC_CATEGORY_PD = 13, /**< Punctuation, dash */ UTF8PROC_CATEGORY_PS = 14, /**< Punctuation, open */ UTF8PROC_CATEGORY_PE = 15, /**< Punctuation, close */ UTF8PROC_CATEGORY_PI = 16, /**< Punctuation, initial quote */ UTF8PROC_CATEGORY_PF = 17, /**< Punctuation, final quote */ UTF8PROC_CATEGORY_PO = 18, /**< Punctuation, other */ UTF8PROC_CATEGORY_SM = 19, /**< Symbol, math */ UTF8PROC_CATEGORY_SC = 20, /**< Symbol, currency */ UTF8PROC_CATEGORY_SK = 21, /**< Symbol, modifier */ UTF8PROC_CATEGORY_SO = 22, /**< Symbol, other */ UTF8PROC_CATEGORY_ZS = 23, /**< Separator, space */ UTF8PROC_CATEGORY_ZL = 24, /**< Separator, line */ UTF8PROC_CATEGORY_ZP = 25, /**< Separator, paragraph */ UTF8PROC_CATEGORY_CC = 26, /**< Other, control */ UTF8PROC_CATEGORY_CF = 27, /**< Other, format */ UTF8PROC_CATEGORY_CS = 28, /**< Other, surrogate */ UTF8PROC_CATEGORY_CO = 29, /**< Other, private use */ } utf8proc_category_t; /** Bidirectional character classes. */ typedef enum { UTF8PROC_BIDI_CLASS_L = 1, /**< Left-to-Right */ UTF8PROC_BIDI_CLASS_LRE = 2, /**< Left-to-Right Embedding */ UTF8PROC_BIDI_CLASS_LRO = 3, /**< Left-to-Right Override */ UTF8PROC_BIDI_CLASS_R = 4, /**< Right-to-Left */ UTF8PROC_BIDI_CLASS_AL = 5, /**< Right-to-Left Arabic */ UTF8PROC_BIDI_CLASS_RLE = 6, /**< Right-to-Left Embedding */ UTF8PROC_BIDI_CLASS_RLO = 7, /**< Right-to-Left Override */ UTF8PROC_BIDI_CLASS_PDF = 8, /**< Pop Directional Format */ UTF8PROC_BIDI_CLASS_EN = 9, /**< European Number */ UTF8PROC_BIDI_CLASS_ES = 10, /**< European Separator */ UTF8PROC_BIDI_CLASS_ET = 11, /**< European Number Terminator */ UTF8PROC_BIDI_CLASS_AN = 12, /**< Arabic Number */ UTF8PROC_BIDI_CLASS_CS = 13, /**< Common Number Separator */ UTF8PROC_BIDI_CLASS_NSM = 14, /**< Nonspacing Mark */ UTF8PROC_BIDI_CLASS_BN = 15, /**< Boundary Neutral */ UTF8PROC_BIDI_CLASS_B = 16, /**< Paragraph Separator */ UTF8PROC_BIDI_CLASS_S = 17, /**< Segment Separator */ UTF8PROC_BIDI_CLASS_WS = 18, /**< Whitespace */ UTF8PROC_BIDI_CLASS_ON = 19, /**< Other Neutrals */ UTF8PROC_BIDI_CLASS_LRI = 20, /**< Left-to-Right Isolate */ UTF8PROC_BIDI_CLASS_RLI = 21, /**< Right-to-Left Isolate */ UTF8PROC_BIDI_CLASS_FSI = 22, /**< First Strong Isolate */ UTF8PROC_BIDI_CLASS_PDI = 23, /**< Pop Directional Isolate */ } utf8proc_bidi_class_t; /** Decomposition type. */ typedef enum { UTF8PROC_DECOMP_TYPE_FONT = 1, /**< Font */ UTF8PROC_DECOMP_TYPE_NOBREAK = 2, /**< Nobreak */ UTF8PROC_DECOMP_TYPE_INITIAL = 3, /**< Initial */ UTF8PROC_DECOMP_TYPE_MEDIAL = 4, /**< Medial */ UTF8PROC_DECOMP_TYPE_FINAL = 5, /**< Final */ UTF8PROC_DECOMP_TYPE_ISOLATED = 6, /**< Isolated */ UTF8PROC_DECOMP_TYPE_CIRCLE = 7, /**< Circle */ UTF8PROC_DECOMP_TYPE_SUPER = 8, /**< Super */ UTF8PROC_DECOMP_TYPE_SUB = 9, /**< Sub */ UTF8PROC_DECOMP_TYPE_VERTICAL = 10, /**< Vertical */ UTF8PROC_DECOMP_TYPE_WIDE = 11, /**< Wide */ UTF8PROC_DECOMP_TYPE_NARROW = 12, /**< Narrow */ UTF8PROC_DECOMP_TYPE_SMALL = 13, /**< Small */ UTF8PROC_DECOMP_TYPE_SQUARE = 14, /**< Square */ UTF8PROC_DECOMP_TYPE_FRACTION = 15, /**< Fraction */ UTF8PROC_DECOMP_TYPE_COMPAT = 16, /**< Compat */ } utf8proc_decomp_type_t; /** Boundclass property. (TR29) */ typedef enum { UTF8PROC_BOUNDCLASS_START = 0, /**< Start */ UTF8PROC_BOUNDCLASS_OTHER = 1, /**< Other */ UTF8PROC_BOUNDCLASS_CR = 2, /**< Cr */ UTF8PROC_BOUNDCLASS_LF = 3, /**< Lf */ UTF8PROC_BOUNDCLASS_CONTROL = 4, /**< Control */ UTF8PROC_BOUNDCLASS_EXTEND = 5, /**< Extend */ UTF8PROC_BOUNDCLASS_L = 6, /**< L */ UTF8PROC_BOUNDCLASS_V = 7, /**< V */ UTF8PROC_BOUNDCLASS_T = 8, /**< T */ UTF8PROC_BOUNDCLASS_LV = 9, /**< Lv */ UTF8PROC_BOUNDCLASS_LVT = 10, /**< Lvt */ UTF8PROC_BOUNDCLASS_REGIONAL_INDICATOR = 11, /**< Regional indicator */ UTF8PROC_BOUNDCLASS_SPACINGMARK = 12, /**< Spacingmark */ UTF8PROC_BOUNDCLASS_PREPEND = 13, /**< Prepend */ UTF8PROC_BOUNDCLASS_ZWJ = 14, /**< Zero Width Joiner */ /* the following are no longer used in Unicode 11, but we keep the constants here for backward compatibility */ UTF8PROC_BOUNDCLASS_E_BASE = 15, /**< Emoji Base */ UTF8PROC_BOUNDCLASS_E_MODIFIER = 16, /**< Emoji Modifier */ UTF8PROC_BOUNDCLASS_GLUE_AFTER_ZWJ = 17, /**< Glue_After_ZWJ */ UTF8PROC_BOUNDCLASS_E_BASE_GAZ = 18, /**< E_BASE + GLUE_AFTER_ZJW */ /* the Extended_Pictographic property is used in the Unicode 11 grapheme-boundary rules, so we store it in the boundclass field */ UTF8PROC_BOUNDCLASS_EXTENDED_PICTOGRAPHIC = 19, UTF8PROC_BOUNDCLASS_E_ZWG = 20, /* UTF8PROC_BOUNDCLASS_EXTENDED_PICTOGRAPHIC + ZWJ */ } utf8proc_boundclass_t; /** Indic_Conjunct_Break property. (TR44) */ typedef enum { UTF8PROC_INDIC_CONJUNCT_BREAK_NONE = 0, UTF8PROC_INDIC_CONJUNCT_BREAK_LINKER = 1, UTF8PROC_INDIC_CONJUNCT_BREAK_CONSONANT = 2, UTF8PROC_INDIC_CONJUNCT_BREAK_EXTEND = 3, } utf8proc_indic_conjunct_break_t; /** * Function pointer type passed to utf8proc_map_custom() and * utf8proc_decompose_custom(), which is used to specify a user-defined * mapping of codepoints to be applied in conjunction with other mappings. */ typedef utf8proc_int32_t (*utf8proc_custom_func)(utf8proc_int32_t codepoint, void *data); /** * Array containing the byte lengths of a UTF-8 encoded codepoint based * on the first byte. */ UTF8PROC_DLLEXPORT extern const utf8proc_int8_t utf8proc_utf8class[256]; /** * Returns the utf8proc API version as a string MAJOR.MINOR.PATCH * (http://semver.org format), possibly with a "-dev" suffix for * development versions. */ UTF8PROC_DLLEXPORT const char *utf8proc_version(void); /** * Returns the utf8proc supported Unicode version as a string MAJOR.MINOR.PATCH. */ UTF8PROC_DLLEXPORT const char *utf8proc_unicode_version(void); /** * Returns an informative error string for the given utf8proc error code * (e.g. the error codes returned by utf8proc_map()). */ UTF8PROC_DLLEXPORT const char *utf8proc_errmsg(utf8proc_ssize_t errcode); /** * Reads a single codepoint from the UTF-8 sequence being pointed to by `str`. * The maximum number of bytes read is `strlen`, unless `strlen` is * negative (in which case up to 4 bytes are read). * * If a valid codepoint could be read, it is stored in the variable * pointed to by `codepoint_ref`, otherwise that variable will be set to -1. * In case of success, the number of bytes read is returned; otherwise, a * negative error code is returned. */ UTF8PROC_DLLEXPORT utf8proc_ssize_t utf8proc_iterate(const utf8proc_uint8_t *str, utf8proc_ssize_t strlen, utf8proc_int32_t *codepoint_ref); /** * Check if a codepoint is valid (regardless of whether it has been * assigned a value by the current Unicode standard). * * @return 1 if the given `codepoint` is valid and otherwise return 0. */ UTF8PROC_DLLEXPORT utf8proc_bool utf8proc_codepoint_valid(utf8proc_int32_t codepoint); /** * Encodes the codepoint as an UTF-8 string in the byte array pointed * to by `dst`. This array must be at least 4 bytes long. * * In case of success the number of bytes written is returned, and * otherwise 0 is returned. * * This function does not check whether `codepoint` is valid Unicode. */ UTF8PROC_DLLEXPORT utf8proc_ssize_t utf8proc_encode_char(utf8proc_int32_t codepoint, utf8proc_uint8_t *dst); /** * Look up the properties for a given codepoint. * * @param codepoint The Unicode codepoint. * * @returns * A pointer to a (constant) struct containing information about * the codepoint. * @par * If the codepoint is unassigned or invalid, a pointer to a special struct is * returned in which `category` is 0 (@ref UTF8PROC_CATEGORY_CN). */ UTF8PROC_DLLEXPORT const utf8proc_property_t *utf8proc_get_property(utf8proc_int32_t codepoint); /** Decompose a codepoint into an array of codepoints. * * @param codepoint the codepoint. * @param dst the destination buffer. * @param bufsize the size of the destination buffer. * @param options one or more of the following flags: * - @ref UTF8PROC_REJECTNA - return an error if `codepoint` is unassigned * - @ref UTF8PROC_IGNORE - strip "default ignorable" codepoints * - @ref UTF8PROC_CASEFOLD - apply Unicode casefolding * - @ref UTF8PROC_COMPAT - replace certain codepoints with their * compatibility decomposition * - @ref UTF8PROC_CHARBOUND - insert 0xFF bytes before each grapheme cluster * - @ref UTF8PROC_LUMP - lump certain different codepoints together * - @ref UTF8PROC_STRIPMARK - remove all character marks * - @ref UTF8PROC_STRIPNA - remove unassigned codepoints * @param last_boundclass * Pointer to an integer variable containing * the previous codepoint's (boundclass + indic_conjunct_break << 1) if the @ref UTF8PROC_CHARBOUND * option is used. If the string is being processed in order, this can be initialized to 0 for * the beginning of the string, and is thereafter updated automatically. Otherwise, this parameter is ignored. * * In the current version of utf8proc, the maximum destination buffer with the @ref UTF8PROC_DECOMPOSE * option is 4 elements (or double that with @ref UTF8PROC_CHARBOUND), so this is a good default size. * However, this may increase in future Unicode versions, so you should always check the return value * as described below. * * @return * In case of success, the number of codepoints written is returned; in case * of an error, a negative error code is returned (utf8proc_errmsg()). * @par * If the number of written codepoints would be bigger than `bufsize`, the * required buffer size is returned, while the buffer will be overwritten with * undefined data. */ UTF8PROC_DLLEXPORT utf8proc_ssize_t utf8proc_decompose_char( utf8proc_int32_t codepoint, utf8proc_int32_t *dst, utf8proc_ssize_t bufsize, utf8proc_option_t options, int *last_boundclass ); /** * The same as utf8proc_decompose_char(), but acts on a whole UTF-8 * string and orders the decomposed sequences correctly. * * If the @ref UTF8PROC_NULLTERM flag in `options` is set, processing * will be stopped, when a NULL byte is encountered, otherwise `strlen` * bytes are processed. The result (in the form of 32-bit unicode * codepoints) is written into the buffer being pointed to by * `buffer` (which must contain at least `bufsize` entries). In case of * success, the number of codepoints written is returned; in case of an * error, a negative error code is returned (utf8proc_errmsg()). * See utf8proc_decompose_custom() to supply additional transformations. * * If the number of written codepoints would be bigger than `bufsize`, the * required buffer size is returned, while the buffer will be overwritten with * undefined data. */ UTF8PROC_DLLEXPORT utf8proc_ssize_t utf8proc_decompose( const utf8proc_uint8_t *str, utf8proc_ssize_t strlen, utf8proc_int32_t *buffer, utf8proc_ssize_t bufsize, utf8proc_option_t options ); /** * The same as utf8proc_decompose(), but also takes a `custom_func` mapping function * that is called on each codepoint in `str` before any other transformations * (along with a `custom_data` pointer that is passed through to `custom_func`). * The `custom_func` argument is ignored if it is `NULL`. See also utf8proc_map_custom(). */ UTF8PROC_DLLEXPORT utf8proc_ssize_t utf8proc_decompose_custom( const utf8proc_uint8_t *str, utf8proc_ssize_t strlen, utf8proc_int32_t *buffer, utf8proc_ssize_t bufsize, utf8proc_option_t options, utf8proc_custom_func custom_func, void *custom_data ); /** * Normalizes the sequence of `length` codepoints pointed to by `buffer` * in-place (i.e., the result is also stored in `buffer`). * * @param buffer the (native-endian UTF-32) unicode codepoints to re-encode. * @param length the length (in codepoints) of the buffer. * @param options a bitwise or (`|`) of one or more of the following flags: * - @ref UTF8PROC_NLF2LS - convert LF, CRLF, CR and NEL into LS * - @ref UTF8PROC_NLF2PS - convert LF, CRLF, CR and NEL into PS * - @ref UTF8PROC_NLF2LF - convert LF, CRLF, CR and NEL into LF * - @ref UTF8PROC_STRIPCC - strip or convert all non-affected control characters * - @ref UTF8PROC_COMPOSE - try to combine decomposed codepoints into composite * codepoints * - @ref UTF8PROC_STABLE - prohibit combining characters that would violate * the unicode versioning stability * * @return * In case of success, the length (in codepoints) of the normalized UTF-32 string is * returned; otherwise, a negative error code is returned (utf8proc_errmsg()). * * @warning The entries of the array pointed to by `str` have to be in the * range `0x0000` to `0x10FFFF`. Otherwise, the program might crash! */ UTF8PROC_DLLEXPORT utf8proc_ssize_t utf8proc_normalize_utf32(utf8proc_int32_t *buffer, utf8proc_ssize_t length, utf8proc_option_t options); /** * Reencodes the sequence of `length` codepoints pointed to by `buffer` * UTF-8 data in-place (i.e., the result is also stored in `buffer`). * Can optionally normalize the UTF-32 sequence prior to UTF-8 conversion. * * @param buffer the (native-endian UTF-32) unicode codepoints to re-encode. * @param length the length (in codepoints) of the buffer. * @param options a bitwise or (`|`) of one or more of the following flags: * - @ref UTF8PROC_NLF2LS - convert LF, CRLF, CR and NEL into LS * - @ref UTF8PROC_NLF2PS - convert LF, CRLF, CR and NEL into PS * - @ref UTF8PROC_NLF2LF - convert LF, CRLF, CR and NEL into LF * - @ref UTF8PROC_STRIPCC - strip or convert all non-affected control characters * - @ref UTF8PROC_COMPOSE - try to combine decomposed codepoints into composite * codepoints * - @ref UTF8PROC_STABLE - prohibit combining characters that would violate * the unicode versioning stability * - @ref UTF8PROC_CHARBOUND - insert 0xFF bytes before each grapheme cluster * * @return * In case of success, the length (in bytes) of the resulting nul-terminated * UTF-8 string is returned; otherwise, a negative error code is returned * (utf8proc_errmsg()). * * @warning The amount of free space pointed to by `buffer` must * exceed the amount of the input data by one byte, and the * entries of the array pointed to by `str` have to be in the * range `0x0000` to `0x10FFFF`. Otherwise, the program might crash! */ UTF8PROC_DLLEXPORT utf8proc_ssize_t utf8proc_reencode(utf8proc_int32_t *buffer, utf8proc_ssize_t length, utf8proc_option_t options); /** * Given a pair of consecutive codepoints, return whether a grapheme break is * permitted between them (as defined by the extended grapheme clusters in UAX#29). * * @param codepoint1 The first codepoint. * @param codepoint2 The second codepoint, occurring consecutively after `codepoint1`. * @param state Beginning with Version 29 (Unicode 9.0.0), this algorithm requires * state to break graphemes. This state can be passed in as a pointer * in the `state` argument and should initially be set to 0. If the * state is not passed in (i.e. a null pointer is passed), UAX#29 rules * GB10/12/13 which require this state will not be applied, essentially * matching the rules in Unicode 8.0.0. * * @warning If the state parameter is used, `utf8proc_grapheme_break_stateful` must * be called IN ORDER on ALL potential breaks in a string. However, it * is safe to reset the state to zero after a grapheme break. */ UTF8PROC_DLLEXPORT utf8proc_bool utf8proc_grapheme_break_stateful( utf8proc_int32_t codepoint1, utf8proc_int32_t codepoint2, utf8proc_int32_t *state); /** * Same as utf8proc_grapheme_break_stateful(), except without support for the * Unicode 9 additions to the algorithm. Supported for legacy reasons. */ UTF8PROC_DLLEXPORT utf8proc_bool utf8proc_grapheme_break( utf8proc_int32_t codepoint1, utf8proc_int32_t codepoint2); /** * Given a codepoint `c`, return the codepoint of the corresponding * lower-case character, if any; otherwise (if there is no lower-case * variant, or if `c` is not a valid codepoint) return `c`. */ UTF8PROC_DLLEXPORT utf8proc_int32_t utf8proc_tolower(utf8proc_int32_t c); /** * Given a codepoint `c`, return the codepoint of the corresponding * upper-case character, if any; otherwise (if there is no upper-case * variant, or if `c` is not a valid codepoint) return `c`. */ UTF8PROC_DLLEXPORT utf8proc_int32_t utf8proc_toupper(utf8proc_int32_t c); /** * Given a codepoint `c`, return the codepoint of the corresponding * title-case character, if any; otherwise (if there is no title-case * variant, or if `c` is not a valid codepoint) return `c`. */ UTF8PROC_DLLEXPORT utf8proc_int32_t utf8proc_totitle(utf8proc_int32_t c); /** * Given a codepoint `c`, return `1` if the codepoint corresponds to a lower-case character * and `0` otherwise. */ UTF8PROC_DLLEXPORT int utf8proc_islower(utf8proc_int32_t c); /** * Given a codepoint `c`, return `1` if the codepoint corresponds to an upper-case character * and `0` otherwise. */ UTF8PROC_DLLEXPORT int utf8proc_isupper(utf8proc_int32_t c); /** * Given a codepoint, return a character width analogous to `wcwidth(codepoint)`, * except that a width of 0 is returned for non-printable codepoints * instead of -1 as in `wcwidth`. * * @note * If you want to check for particular types of non-printable characters, * (analogous to `isprint` or `iscntrl`), use utf8proc_category(). */ UTF8PROC_DLLEXPORT int utf8proc_charwidth(utf8proc_int32_t codepoint); /** * Given a codepoint, return whether it has East Asian width class A (Ambiguous) * * Codepoints with this property are considered to have charwidth 1 (if they are printable) * but some East Asian fonts render them as double width. */ UTF8PROC_DLLEXPORT utf8proc_bool utf8proc_charwidth_ambiguous(utf8proc_int32_t codepoint); /** * Return the Unicode category for the codepoint (one of the * @ref utf8proc_category_t constants.) */ UTF8PROC_DLLEXPORT utf8proc_category_t utf8proc_category(utf8proc_int32_t codepoint); /** * Return the two-letter (nul-terminated) Unicode category string for * the codepoint (e.g. `"Lu"` or `"Co"`). */ UTF8PROC_DLLEXPORT const char *utf8proc_category_string(utf8proc_int32_t codepoint); /** * Maps the given UTF-8 string pointed to by `str` to a new UTF-8 * string, allocated dynamically by `malloc` and returned via `dstptr`. * * If the @ref UTF8PROC_NULLTERM flag in the `options` field is set, * the length is determined by a NULL terminator, otherwise the * parameter `strlen` is evaluated to determine the string length, but * in any case the result will be NULL terminated (though it might * contain NULL characters with the string if `str` contained NULL * characters). Other flags in the `options` field are passed to the * functions defined above, and regarded as described. See also * utf8proc_map_custom() to supply a custom codepoint transformation. * * In case of success the length of the new string is returned, * otherwise a negative error code is returned. * * @note The memory of the new UTF-8 string will have been allocated * with `malloc`, and should therefore be deallocated with `free`. * However, it is safer to deallocate it with @ref utf8proc_free in * case your application is linked to a different C library than utf8proc. * * @note `utf8proc_map` simply calls `utf8proc_decompose` followed by `utf8proc_reencode`, * and applications requiring greater control over memory allocation should instead call * those two functions directly. */ UTF8PROC_DLLEXPORT utf8proc_ssize_t utf8proc_map( const utf8proc_uint8_t *str, utf8proc_ssize_t strlen, utf8proc_uint8_t **dstptr, utf8proc_option_t options ); /** * Like @ref utf8proc_map, but also takes a `custom_func` mapping function * that is called on each codepoint in `str` before any other transformations * (along with a `custom_data` pointer that is passed through to `custom_func`). * The `custom_func` argument is ignored if it is `NULL`. */ UTF8PROC_DLLEXPORT utf8proc_ssize_t utf8proc_map_custom( const utf8proc_uint8_t *str, utf8proc_ssize_t strlen, utf8proc_uint8_t **dstptr, utf8proc_option_t options, utf8proc_custom_func custom_func, void *custom_data ); /** @name Unicode normalization * * Returns a pointer to newly allocated memory of a NFD, NFC, NFKD, NFKC or * NFKC_Casefold normalized version of the null-terminated string `str`. These * are shortcuts to calling utf8proc_map() with @ref UTF8PROC_NULLTERM * combined with @ref UTF8PROC_STABLE and flags indicating the normalization. * * @note The memory of the new UTF-8 string will have been allocated * with `malloc`, and should therefore be deallocated with `free`. * However, it is safer to deallocate it with @ref utf8proc_free in * case your application is linked to a different C library than utf8proc. */ /** @{ */ /** NFD normalization (@ref UTF8PROC_DECOMPOSE). */ UTF8PROC_DLLEXPORT utf8proc_uint8_t *utf8proc_NFD(const utf8proc_uint8_t *str); /** NFC normalization (@ref UTF8PROC_COMPOSE). */ UTF8PROC_DLLEXPORT utf8proc_uint8_t *utf8proc_NFC(const utf8proc_uint8_t *str); /** NFKD normalization (@ref UTF8PROC_DECOMPOSE and @ref UTF8PROC_COMPAT). */ UTF8PROC_DLLEXPORT utf8proc_uint8_t *utf8proc_NFKD(const utf8proc_uint8_t *str); /** NFKC normalization (@ref UTF8PROC_COMPOSE and @ref UTF8PROC_COMPAT). */ UTF8PROC_DLLEXPORT utf8proc_uint8_t *utf8proc_NFKC(const utf8proc_uint8_t *str); /** * NFKC_Casefold normalization (@ref UTF8PROC_COMPOSE and @ref UTF8PROC_COMPAT * and @ref UTF8PROC_CASEFOLD and @ref UTF8PROC_IGNORE). **/ UTF8PROC_DLLEXPORT utf8proc_uint8_t *utf8proc_NFKC_Casefold(const utf8proc_uint8_t *str); /** @} */ /** * Deallocate memory allocated and returned by @ref utf8proc_map and similar functions * (which simply calls the `free` function from the underlying C library linked to utf8proc). * It is safer to call `utf8proc_free` than calling `free` directly, in case your application * is linked to a different C library with incompatible `malloc` and `free` functions. */ UTF8PROC_DLLEXPORT void utf8proc_free(utf8proc_uint8_t *ptr); #ifdef __cplusplus } #endif #endif