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/* Multibyte character data type.
Copyright (C) 2001, 2005-2007, 2009-2024 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>. */
/* A multibyte character is a short subsequence of a char* string,
representing a single 32-bit wide character.
We use multibyte characters instead of 32-bit wide characters because
of the following goals:
1) correct multibyte handling, i.e. operate according to the LC_CTYPE
locale,
2) ease of maintenance, i.e. the maintainer needs not know all details
of the ISO C 99 standard,
3) don't fail grossly if the input is not in the encoding set by the
locale, because often different encodings are in use in the same
countries (ISO-8859-1/UTF-8, EUC-JP/Shift_JIS, ...),
4) fast in the case of ASCII characters.
Multibyte characters are only accessed through the mb* macros.
mb_ptr (mbc)
return a pointer to the beginning of the multibyte sequence.
mb_len (mbc)
returns the number of bytes occupied by the multibyte sequence.
Always > 0.
mb_iseq (mbc, sc)
returns true if mbc is the standard ASCII character sc.
mb_isnul (mbc)
returns true if mbc is the nul character.
mb_cmp (mbc1, mbc2)
returns a positive, zero, or negative value depending on whether mbc1
sorts after, same or before mbc2.
mb_casecmp (mbc1, mbc2)
returns a positive, zero, or negative value depending on whether mbc1
sorts after, same or before mbc2, modulo upper/lowercase conversion.
mb_equal (mbc1, mbc2)
returns true if mbc1 and mbc2 are equal.
mb_caseequal (mbc1, mbc2)
returns true if mbc1 and mbc2 are equal modulo upper/lowercase conversion.
mb_isalnum (mbc)
returns true if mbc is alphanumeric.
mb_isalpha (mbc)
returns true if mbc is alphabetic.
mb_isascii(mbc)
returns true if mbc is plain ASCII.
mb_isblank (mbc)
returns true if mbc is a blank.
mb_iscntrl (mbc)
returns true if mbc is a control character.
mb_isdigit (mbc)
returns true if mbc is a decimal digit.
mb_isgraph (mbc)
returns true if mbc is a graphic character.
mb_islower (mbc)
returns true if mbc is lowercase.
mb_isprint (mbc)
returns true if mbc is a printable character.
mb_ispunct (mbc)
returns true if mbc is a punctuation character.
mb_isspace (mbc)
returns true if mbc is a space character.
mb_isupper (mbc)
returns true if mbc is uppercase.
mb_isxdigit (mbc)
returns true if mbc is a hexadecimal digit.
mb_width (mbc)
returns the number of columns on the output device occupied by mbc.
Always >= 0.
mb_putc (mbc, stream)
outputs mbc on stream, a byte oriented FILE stream opened for output.
mb_setascii (&mbc, sc)
assigns the standard ASCII character sc to mbc.
(Only available if the 'mbfile' module is in use.)
mb_copy (&destmbc, &srcmbc)
copies srcmbc to destmbc.
Here are the function prototypes of the macros.
extern const char * mb_ptr (const mbchar_t mbc);
extern size_t mb_len (const mbchar_t mbc);
extern bool mb_iseq (const mbchar_t mbc, char sc);
extern bool mb_isnul (const mbchar_t mbc);
extern int mb_cmp (const mbchar_t mbc1, const mbchar_t mbc2);
extern int mb_casecmp (const mbchar_t mbc1, const mbchar_t mbc2);
extern bool mb_equal (const mbchar_t mbc1, const mbchar_t mbc2);
extern bool mb_caseequal (const mbchar_t mbc1, const mbchar_t mbc2);
extern bool mb_isalnum (const mbchar_t mbc);
extern bool mb_isalpha (const mbchar_t mbc);
extern bool mb_isascii (const mbchar_t mbc);
extern bool mb_isblank (const mbchar_t mbc);
extern bool mb_iscntrl (const mbchar_t mbc);
extern bool mb_isdigit (const mbchar_t mbc);
extern bool mb_isgraph (const mbchar_t mbc);
extern bool mb_islower (const mbchar_t mbc);
extern bool mb_isprint (const mbchar_t mbc);
extern bool mb_ispunct (const mbchar_t mbc);
extern bool mb_isspace (const mbchar_t mbc);
extern bool mb_isupper (const mbchar_t mbc);
extern bool mb_isxdigit (const mbchar_t mbc);
extern int mb_width (const mbchar_t mbc);
extern void mb_putc (const mbchar_t mbc, FILE *stream);
extern void mb_setascii (mbchar_t *new, char sc);
extern void mb_copy (mbchar_t *new, const mbchar_t *old);
*/
#ifndef _MBCHAR_H
#define _MBCHAR_H 1
/* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE. */
#if !_GL_CONFIG_H_INCLUDED
#error "Please include config.h first."
#endif
#include <string.h>
#include <uchar.h>
_GL_INLINE_HEADER_BEGIN
#ifndef MBCHAR_INLINE
# define MBCHAR_INLINE _GL_INLINE
#endif
/* The longest multibyte characters, nowadays, are 4 bytes long.
Regardless of the values of MB_CUR_MAX and MB_LEN_MAX. */
#define MBCHAR_BUF_SIZE 4
struct mbchar
{
const char *ptr; /* pointer to current character */
size_t bytes; /* number of bytes of current character, > 0 */
bool wc_valid; /* true if wc is a valid 32-bit wide character */
char32_t wc; /* if wc_valid: the current character */
#if defined GNULIB_MBFILE
char buf[MBCHAR_BUF_SIZE]; /* room for the bytes, used for file input only */
#endif
};
/* EOF (not a real character) is represented with bytes = 0 and
wc_valid = false. */
typedef struct mbchar mbchar_t;
/* Access the current character. */
#define mb_ptr(mbc) ((mbc).ptr)
#define mb_len(mbc) ((mbc).bytes)
/* Comparison of characters. */
#define mb_iseq(mbc, sc) ((mbc).wc_valid && (mbc).wc == (sc))
#define mb_isnul(mbc) ((mbc).wc_valid && (mbc).wc == 0)
#define mb_cmp(mbc1, mbc2) \
((mbc1).wc_valid \
? ((mbc2).wc_valid \
? _GL_CMP ((mbc1).wc, (mbc2).wc) \
: -1) \
: ((mbc2).wc_valid \
? 1 \
: (mbc1).bytes == (mbc2).bytes \
? memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) \
: (mbc1).bytes < (mbc2).bytes \
? (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) > 0 ? 1 : -1) \
: (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc2).bytes) >= 0 ? 1 : -1)))
#define mb_casecmp(mbc1, mbc2) \
((mbc1).wc_valid \
? ((mbc2).wc_valid \
? _GL_CMP (c32tolower ((mbc1).wc), c32tolower ((mbc2).wc)) \
: -1) \
: ((mbc2).wc_valid \
? 1 \
: (mbc1).bytes == (mbc2).bytes \
? memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) \
: (mbc1).bytes < (mbc2).bytes \
? (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) > 0 ? 1 : -1) \
: (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc2).bytes) >= 0 ? 1 : -1)))
#define mb_equal(mbc1, mbc2) \
((mbc1).wc_valid && (mbc2).wc_valid \
? (mbc1).wc == (mbc2).wc \
: (mbc1).bytes == (mbc2).bytes \
&& memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) == 0)
#define mb_caseequal(mbc1, mbc2) \
((mbc1).wc_valid && (mbc2).wc_valid \
? c32tolower ((mbc1).wc) == c32tolower ((mbc2).wc) \
: (mbc1).bytes == (mbc2).bytes \
&& memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) == 0)
/* <ctype.h>, <wctype.h> classification. */
#define mb_isascii(mbc) \
((mbc).wc_valid && (mbc).wc >= 0 && (mbc).wc <= 127)
#define mb_isalnum(mbc) ((mbc).wc_valid && c32isalnum ((mbc).wc))
#define mb_isalpha(mbc) ((mbc).wc_valid && c32isalpha ((mbc).wc))
#define mb_isblank(mbc) ((mbc).wc_valid && c32isblank ((mbc).wc))
#define mb_iscntrl(mbc) ((mbc).wc_valid && c32iscntrl ((mbc).wc))
#define mb_isdigit(mbc) ((mbc).wc_valid && c32isdigit ((mbc).wc))
#define mb_isgraph(mbc) ((mbc).wc_valid && c32isgraph ((mbc).wc))
#define mb_islower(mbc) ((mbc).wc_valid && c32islower ((mbc).wc))
#define mb_isprint(mbc) ((mbc).wc_valid && c32isprint ((mbc).wc))
#define mb_ispunct(mbc) ((mbc).wc_valid && c32ispunct ((mbc).wc))
#define mb_isspace(mbc) ((mbc).wc_valid && c32isspace ((mbc).wc))
#define mb_isupper(mbc) ((mbc).wc_valid && c32isupper ((mbc).wc))
#define mb_isxdigit(mbc) ((mbc).wc_valid && c32isxdigit ((mbc).wc))
/* Extra <wchar.h> function. */
/* Unprintable characters appear as a small box of width 1. */
#define MB_UNPRINTABLE_WIDTH 1
MBCHAR_INLINE int
mb_width_aux (char32_t wc)
{
int w = c32width (wc);
/* For unprintable characters, arbitrarily return 0 for control characters
and MB_UNPRINTABLE_WIDTH otherwise. */
return (w >= 0 ? w : c32iscntrl (wc) ? 0 : MB_UNPRINTABLE_WIDTH);
}
#define mb_width(mbc) \
((mbc).wc_valid ? mb_width_aux ((mbc).wc) : MB_UNPRINTABLE_WIDTH)
/* Output. */
#define mb_putc(mbc, stream) fwrite ((mbc).ptr, 1, (mbc).bytes, (stream))
#if defined GNULIB_MBFILE
/* Assignment. */
# define mb_setascii(mbc, sc) \
((mbc)->ptr = (mbc)->buf, (mbc)->bytes = 1, (mbc)->wc_valid = 1, \
(mbc)->wc = (mbc)->buf[0] = (sc))
#endif
/* Copying a character. */
MBCHAR_INLINE void
mb_copy (mbchar_t *new_mbc, const mbchar_t *old_mbc)
{
#if defined GNULIB_MBFILE
if (old_mbc->ptr == &old_mbc->buf[0])
{
memcpy (&new_mbc->buf[0], &old_mbc->buf[0], old_mbc->bytes);
new_mbc->ptr = &new_mbc->buf[0];
}
else
#endif
new_mbc->ptr = old_mbc->ptr;
new_mbc->bytes = old_mbc->bytes;
if ((new_mbc->wc_valid = old_mbc->wc_valid))
new_mbc->wc = old_mbc->wc;
}
/* is_basic(c) tests whether the single-byte character c is
- in the ISO C "basic character set" or is one of '@', '$', and '`'
which ISO C 23 § 5.2.1.1.(1) guarantees to be single-byte and in
practice are safe to treat as basic in the execution character set,
or
- in the POSIX "portable character set", which
<https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap06.html>
equally guarantees to be single-byte.
This is a convenience function, and is in this file only to share code
between mbiter.h, mbuiter.h, and mbfile.h. */
#if (' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
&& ('$' == 36) && ('%' == 37) && ('&' == 38) && ('\'' == 39) \
&& ('(' == 40) && (')' == 41) && ('*' == 42) && ('+' == 43) \
&& (',' == 44) && ('-' == 45) && ('.' == 46) && ('/' == 47) \
&& ('0' == 48) && ('1' == 49) && ('2' == 50) && ('3' == 51) \
&& ('4' == 52) && ('5' == 53) && ('6' == 54) && ('7' == 55) \
&& ('8' == 56) && ('9' == 57) && (':' == 58) && (';' == 59) \
&& ('<' == 60) && ('=' == 61) && ('>' == 62) && ('?' == 63) \
&& ('@' == 64) && ('A' == 65) && ('B' == 66) && ('C' == 67) \
&& ('D' == 68) && ('E' == 69) && ('F' == 70) && ('G' == 71) \
&& ('H' == 72) && ('I' == 73) && ('J' == 74) && ('K' == 75) \
&& ('L' == 76) && ('M' == 77) && ('N' == 78) && ('O' == 79) \
&& ('P' == 80) && ('Q' == 81) && ('R' == 82) && ('S' == 83) \
&& ('T' == 84) && ('U' == 85) && ('V' == 86) && ('W' == 87) \
&& ('X' == 88) && ('Y' == 89) && ('Z' == 90) && ('[' == 91) \
&& ('\\' == 92) && (']' == 93) && ('^' == 94) && ('_' == 95) \
&& ('`' == 96) && ('a' == 97) && ('b' == 98) && ('c' == 99) \
&& ('d' == 100) && ('e' == 101) && ('f' == 102) && ('g' == 103) \
&& ('h' == 104) && ('i' == 105) && ('j' == 106) && ('k' == 107) \
&& ('l' == 108) && ('m' == 109) && ('n' == 110) && ('o' == 111) \
&& ('p' == 112) && ('q' == 113) && ('r' == 114) && ('s' == 115) \
&& ('t' == 116) && ('u' == 117) && ('v' == 118) && ('w' == 119) \
&& ('x' == 120) && ('y' == 121) && ('z' == 122) && ('{' == 123) \
&& ('|' == 124) && ('}' == 125) && ('~' == 126)
/* The character set is ISO-646, not EBCDIC. */
# define IS_BASIC_ASCII 1
/* All locale encodings (see localcharset.h) map the characters 0x00..0x7F
to U+0000..U+007F, like ASCII, except for
CP864 different mapping of '%'
SHIFT_JIS different mappings of 0x5C, 0x7E
JOHAB different mapping of 0x5C
However, these characters in the range 0x20..0x7E are in the ISO C
"basic character set" and in the POSIX "portable character set", which
ISO C and POSIX guarantee to be single-byte. Thus, locales with these
encodings are not POSIX compliant. And they are most likely not in use
any more (as of 2023). */
# define is_basic(c) ((unsigned char) (c) < 0x80)
#else
MBCHAR_INLINE bool
is_basic (char c)
{
switch (c)
{
case '\0':
case '\007': case '\010':
case '\t': case '\n': case '\v': case '\f': case '\r':
case ' ': case '!': case '"': case '#': case '$': case '%':
case '&': case '\'': case '(': case ')': case '*':
case '+': case ',': case '-': case '.': case '/':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case ':': case ';': case '<': case '=': case '>':
case '?': case '@':
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F': case 'G': case 'H': case 'I': case 'J':
case 'K': case 'L': case 'M': case 'N': case 'O':
case 'P': case 'Q': case 'R': case 'S': case 'T':
case 'U': case 'V': case 'W': case 'X': case 'Y':
case 'Z':
case '[': case '\\': case ']': case '^': case '_': case '`':
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f': case 'g': case 'h': case 'i': case 'j':
case 'k': case 'l': case 'm': case 'n': case 'o':
case 'p': case 'q': case 'r': case 's': case 't':
case 'u': case 'v': case 'w': case 'x': case 'y':
case 'z': case '{': case '|': case '}': case '~':
return 1;
default:
return 0;
}
}
#endif
_GL_INLINE_HEADER_END
#endif /* _MBCHAR_H */
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