1 /* Multibyte character data type.
2 Copyright (C) 2001, 2005-2007, 2009-2013 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* Written by Bruno Haible <bruno@clisp.org>. */
19 /* A multibyte character is a short subsequence of a char* string,
20 representing a single wide character.
22 We use multibyte characters instead of wide characters because of
24 1) correct multibyte handling, i.e. operate according to the LC_CTYPE
26 2) ease of maintenance, i.e. the maintainer needs not know all details
27 of the ISO C 99 standard,
28 3) don't fail grossly if the input is not in the encoding set by the
29 locale, because often different encodings are in use in the same
30 countries (ISO-8859-1/UTF-8, EUC-JP/Shift_JIS, ...),
31 4) fast in the case of ASCII characters,
32 5) portability, i.e. don't make unportable assumptions about wchar_t.
34 Multibyte characters are only accessed through the mb* macros.
37 return a pointer to the beginning of the multibyte sequence.
40 returns the number of bytes occupied by the multibyte sequence.
44 returns true if mbc is the standard ASCII character sc.
47 returns true if mbc is the nul character.
50 returns a positive, zero, or negative value depending on whether mbc1
51 sorts after, same or before mbc2.
53 mb_casecmp (mbc1, mbc2)
54 returns a positive, zero, or negative value depending on whether mbc1
55 sorts after, same or before mbc2, modulo upper/lowercase conversion.
58 returns true if mbc1 and mbc2 are equal.
60 mb_caseequal (mbc1, mbc2)
61 returns true if mbc1 and mbc2 are equal modulo upper/lowercase conversion.
64 returns true if mbc is alphanumeric.
67 returns true if mbc is alphabetic.
70 returns true if mbc is plain ASCII.
73 returns true if mbc is a blank.
76 returns true if mbc is a control character.
79 returns true if mbc is a decimal digit.
82 returns true if mbc is a graphic character.
85 returns true if mbc is lowercase.
88 returns true if mbc is a printable character.
91 returns true if mbc is a punctuation character.
94 returns true if mbc is a space character.
97 returns true if mbc is uppercase.
100 returns true if mbc is a hexadecimal digit.
103 returns the number of columns on the output device occupied by mbc.
106 mb_putc (mbc, stream)
107 outputs mbc on stream, a byte oriented FILE stream opened for output.
109 mb_setascii (&mbc, sc)
110 assigns the standard ASCII character sc to mbc.
112 mb_copy (&destmbc, &srcmbc)
113 copies srcmbc to destmbc.
115 Here are the function prototypes of the macros.
117 extern const char * mb_ptr (const mbchar_t mbc);
118 extern size_t mb_len (const mbchar_t mbc);
119 extern bool mb_iseq (const mbchar_t mbc, char sc);
120 extern bool mb_isnul (const mbchar_t mbc);
121 extern int mb_cmp (const mbchar_t mbc1, const mbchar_t mbc2);
122 extern int mb_casecmp (const mbchar_t mbc1, const mbchar_t mbc2);
123 extern bool mb_equal (const mbchar_t mbc1, const mbchar_t mbc2);
124 extern bool mb_caseequal (const mbchar_t mbc1, const mbchar_t mbc2);
125 extern bool mb_isalnum (const mbchar_t mbc);
126 extern bool mb_isalpha (const mbchar_t mbc);
127 extern bool mb_isascii (const mbchar_t mbc);
128 extern bool mb_isblank (const mbchar_t mbc);
129 extern bool mb_iscntrl (const mbchar_t mbc);
130 extern bool mb_isdigit (const mbchar_t mbc);
131 extern bool mb_isgraph (const mbchar_t mbc);
132 extern bool mb_islower (const mbchar_t mbc);
133 extern bool mb_isprint (const mbchar_t mbc);
134 extern bool mb_ispunct (const mbchar_t mbc);
135 extern bool mb_isspace (const mbchar_t mbc);
136 extern bool mb_isupper (const mbchar_t mbc);
137 extern bool mb_isxdigit (const mbchar_t mbc);
138 extern int mb_width (const mbchar_t mbc);
139 extern void mb_putc (const mbchar_t mbc, FILE *stream);
140 extern void mb_setascii (mbchar_t *new, char sc);
141 extern void mb_copy (mbchar_t *new, const mbchar_t *old);
150 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
152 BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before
159 _GL_INLINE_HEADER_BEGIN
160 #ifndef MBCHAR_INLINE
161 # define MBCHAR_INLINE _GL_INLINE
164 #define MBCHAR_BUF_SIZE 24
168 const char *ptr; /* pointer to current character */
169 size_t bytes; /* number of bytes of current character, > 0 */
170 bool wc_valid; /* true if wc is a valid wide character */
171 wchar_t wc; /* if wc_valid: the current character */
172 char buf[MBCHAR_BUF_SIZE]; /* room for the bytes, used for file input only */
175 /* EOF (not a real character) is represented with bytes = 0 and
178 typedef struct mbchar mbchar_t;
180 /* Access the current character. */
181 #define mb_ptr(mbc) ((mbc).ptr)
182 #define mb_len(mbc) ((mbc).bytes)
184 /* Comparison of characters. */
185 #define mb_iseq(mbc, sc) ((mbc).wc_valid && (mbc).wc == (sc))
186 #define mb_isnul(mbc) ((mbc).wc_valid && (mbc).wc == 0)
187 #define mb_cmp(mbc1, mbc2) \
190 ? (int) (mbc1).wc - (int) (mbc2).wc \
194 : (mbc1).bytes == (mbc2).bytes \
195 ? memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) \
196 : (mbc1).bytes < (mbc2).bytes \
197 ? (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) > 0 ? 1 : -1) \
198 : (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc2).bytes) >= 0 ? 1 : -1)))
199 #define mb_casecmp(mbc1, mbc2) \
202 ? (int) towlower ((mbc1).wc) - (int) towlower ((mbc2).wc) \
206 : (mbc1).bytes == (mbc2).bytes \
207 ? memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) \
208 : (mbc1).bytes < (mbc2).bytes \
209 ? (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) > 0 ? 1 : -1) \
210 : (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc2).bytes) >= 0 ? 1 : -1)))
211 #define mb_equal(mbc1, mbc2) \
212 ((mbc1).wc_valid && (mbc2).wc_valid \
213 ? (mbc1).wc == (mbc2).wc \
214 : (mbc1).bytes == (mbc2).bytes \
215 && memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) == 0)
216 #define mb_caseequal(mbc1, mbc2) \
217 ((mbc1).wc_valid && (mbc2).wc_valid \
218 ? towlower ((mbc1).wc) == towlower ((mbc2).wc) \
219 : (mbc1).bytes == (mbc2).bytes \
220 && memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) == 0)
222 /* <ctype.h>, <wctype.h> classification. */
223 #define mb_isascii(mbc) \
224 ((mbc).wc_valid && (mbc).wc >= 0 && (mbc).wc <= 127)
225 #define mb_isalnum(mbc) ((mbc).wc_valid && iswalnum ((mbc).wc))
226 #define mb_isalpha(mbc) ((mbc).wc_valid && iswalpha ((mbc).wc))
227 #define mb_isblank(mbc) ((mbc).wc_valid && iswblank ((mbc).wc))
228 #define mb_iscntrl(mbc) ((mbc).wc_valid && iswcntrl ((mbc).wc))
229 #define mb_isdigit(mbc) ((mbc).wc_valid && iswdigit ((mbc).wc))
230 #define mb_isgraph(mbc) ((mbc).wc_valid && iswgraph ((mbc).wc))
231 #define mb_islower(mbc) ((mbc).wc_valid && iswlower ((mbc).wc))
232 #define mb_isprint(mbc) ((mbc).wc_valid && iswprint ((mbc).wc))
233 #define mb_ispunct(mbc) ((mbc).wc_valid && iswpunct ((mbc).wc))
234 #define mb_isspace(mbc) ((mbc).wc_valid && iswspace ((mbc).wc))
235 #define mb_isupper(mbc) ((mbc).wc_valid && iswupper ((mbc).wc))
236 #define mb_isxdigit(mbc) ((mbc).wc_valid && iswxdigit ((mbc).wc))
238 /* Extra <wchar.h> function. */
240 /* Unprintable characters appear as a small box of width 1. */
241 #define MB_UNPRINTABLE_WIDTH 1
244 mb_width_aux (wint_t wc)
246 int w = wcwidth (wc);
247 /* For unprintable characters, arbitrarily return 0 for control characters
248 and MB_UNPRINTABLE_WIDTH otherwise. */
249 return (w >= 0 ? w : iswcntrl (wc) ? 0 : MB_UNPRINTABLE_WIDTH);
252 #define mb_width(mbc) \
253 ((mbc).wc_valid ? mb_width_aux ((mbc).wc) : MB_UNPRINTABLE_WIDTH)
256 #define mb_putc(mbc, stream) fwrite ((mbc).ptr, 1, (mbc).bytes, (stream))
259 #define mb_setascii(mbc, sc) \
260 ((mbc)->ptr = (mbc)->buf, (mbc)->bytes = 1, (mbc)->wc_valid = 1, \
261 (mbc)->wc = (mbc)->buf[0] = (sc))
263 /* Copying a character. */
265 mb_copy (mbchar_t *new_mbc, const mbchar_t *old_mbc)
267 if (old_mbc->ptr == &old_mbc->buf[0])
269 memcpy (&new_mbc->buf[0], &old_mbc->buf[0], old_mbc->bytes);
270 new_mbc->ptr = &new_mbc->buf[0];
273 new_mbc->ptr = old_mbc->ptr;
274 new_mbc->bytes = old_mbc->bytes;
275 if ((new_mbc->wc_valid = old_mbc->wc_valid))
276 new_mbc->wc = old_mbc->wc;
280 /* is_basic(c) tests whether the single-byte character c is in the
281 ISO C "basic character set".
282 This is a convenience function, and is in this file only to share code
283 between mbiter_multi.h and mbfile_multi.h. */
284 #if (' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
285 && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
286 && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
287 && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
288 && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
289 && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
290 && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
291 && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
292 && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
293 && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
294 && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
295 && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
296 && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
297 && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
298 && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
299 && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
300 && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
301 && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
302 && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
303 && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
304 && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
305 && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
306 && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126)
307 /* The character set is ISO-646, not EBCDIC. */
308 # define IS_BASIC_ASCII 1
310 extern const unsigned int is_basic_table[];
315 return (is_basic_table [(unsigned char) c >> 5] >> ((unsigned char) c & 31))
326 case '\t': case '\v': case '\f':
327 case ' ': case '!': case '"': case '#': case '%':
328 case '&': case '\'': case '(': case ')': case '*':
329 case '+': case ',': case '-': case '.': case '/':
330 case '0': case '1': case '2': case '3': case '4':
331 case '5': case '6': case '7': case '8': case '9':
332 case ':': case ';': case '<': case '=': case '>':
334 case 'A': case 'B': case 'C': case 'D': case 'E':
335 case 'F': case 'G': case 'H': case 'I': case 'J':
336 case 'K': case 'L': case 'M': case 'N': case 'O':
337 case 'P': case 'Q': case 'R': case 'S': case 'T':
338 case 'U': case 'V': case 'W': case 'X': case 'Y':
340 case '[': case '\\': case ']': case '^': case '_':
341 case 'a': case 'b': case 'c': case 'd': case 'e':
342 case 'f': case 'g': case 'h': case 'i': case 'j':
343 case 'k': case 'l': case 'm': case 'n': case 'o':
344 case 'p': case 'q': case 'r': case 's': case 't':
345 case 'u': case 'v': case 'w': case 'x': case 'y':
346 case 'z': case '{': case '|': case '}': case '~':
355 _GL_INLINE_HEADER_END
357 #endif /* _MBCHAR_H */