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1/* Multibyte character data type.
2 Copyright (C) 2001, 2005-2006 Free Software Foundation, Inc.
3
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 2, or (at your option)
7 any later version.
8
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.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
17
18/* Written by Bruno Haible <bruno@clisp.org>. */
19
20/* A multibyte character is a short subsequence of a char* string,
21 representing a single wide character.
22
23 We use multibyte characters instead of wide characters because of
24 the following goals:
25 1) correct multibyte handling, i.e. operate according to the LC_CTYPE
26 locale,
27 2) ease of maintenance, i.e. the maintainer needs not know all details
28 of the ISO C 99 standard,
29 3) don't fail grossly if the input is not in the encoding set by the
30 locale, because often different encodings are in use in the same
31 countries (ISO-8859-1/UTF-8, EUC-JP/Shift_JIS, ...),
32 4) fast in the case of ASCII characters,
33 5) portability, i.e. don't make unportable assumptions about wchar_t.
34
35 Multibyte characters are only accessed through the mb* macros.
36
37 mb_ptr (mbc)
38 return a pointer to the beginning of the multibyte sequence.
39
40 mb_len (mbc)
41 returns the number of bytes occupied by the multibyte sequence.
42 Always > 0.
43
44 mb_iseq (mbc, sc)
45 returns true if mbc is the standard ASCII character sc.
46
47 mb_isnul (mbc)
48 returns true if mbc is the nul character.
49
50 mb_cmp (mbc1, mbc2)
51 returns a positive, zero, or negative value depending on whether mbc1
52 sorts after, same or before mbc2.
53
54 mb_casecmp (mbc1, mbc2)
55 returns a positive, zero, or negative value depending on whether mbc1
56 sorts after, same or before mbc2, modulo upper/lowercase conversion.
57
58 mb_equal (mbc1, mbc2)
59 returns true if mbc1 and mbc2 are equal.
60
61 mb_caseequal (mbc1, mbc2)
62 returns true if mbc1 and mbc2 are equal modulo upper/lowercase conversion.
63
64 mb_isalnum (mbc)
65 returns true if mbc is alphanumeric.
66
67 mb_isalpha (mbc)
68 returns true if mbc is alphabetic.
69
70 mb_isascii(mbc)
71 returns true if mbc is plain ASCII.
72
73 mb_isblank (mbc)
74 returns true if mbc is a blank.
75
76 mb_iscntrl (mbc)
77 returns true if mbc is a control character.
78
79 mb_isdigit (mbc)
80 returns true if mbc is a decimal digit.
81
82 mb_isgraph (mbc)
83 returns true if mbc is a graphic character.
84
85 mb_islower (mbc)
86 returns true if mbc is lowercase.
87
88 mb_isprint (mbc)
89 returns true if mbc is a printable character.
90
91 mb_ispunct (mbc)
92 returns true if mbc is a punctuation character.
93
94 mb_isspace (mbc)
95 returns true if mbc is a space character.
96
97 mb_isupper (mbc)
98 returns true if mbc is uppercase.
99
100 mb_isxdigit (mbc)
101 returns true if mbc is a hexadecimal digit.
102
103 mb_width (mbc)
104 returns the number of columns on the output device occupied by mbc.
105 Always >= 0.
106
107 mb_putc (mbc, stream)
108 outputs mbc on stream, a byte oriented FILE stream opened for output.
109
110 mb_setascii (&mbc, sc)
111 assigns the standard ASCII character sc to mbc.
112
113 mb_copy (&destmbc, &srcmbc)
114 copies srcmbc to destmbc.
115
116 Here are the function prototypes of the macros.
117
118 extern const char * mb_ptr (const mbchar_t mbc);
119 extern size_t mb_len (const mbchar_t mbc);
120 extern bool mb_iseq (const mbchar_t mbc, char sc);
121 extern bool mb_isnul (const mbchar_t mbc);
122 extern int mb_cmp (const mbchar_t mbc1, const mbchar_t mbc2);
123 extern int mb_casecmp (const mbchar_t mbc1, const mbchar_t mbc2);
124 extern bool mb_equal (const mbchar_t mbc1, const mbchar_t mbc2);
125 extern bool mb_caseequal (const mbchar_t mbc1, const mbchar_t mbc2);
126 extern bool mb_isalnum (const mbchar_t mbc);
127 extern bool mb_isalpha (const mbchar_t mbc);
128 extern bool mb_isascii (const mbchar_t mbc);
129 extern bool mb_isblank (const mbchar_t mbc);
130 extern bool mb_iscntrl (const mbchar_t mbc);
131 extern bool mb_isdigit (const mbchar_t mbc);
132 extern bool mb_isgraph (const mbchar_t mbc);
133 extern bool mb_islower (const mbchar_t mbc);
134 extern bool mb_isprint (const mbchar_t mbc);
135 extern bool mb_ispunct (const mbchar_t mbc);
136 extern bool mb_isspace (const mbchar_t mbc);
137 extern bool mb_isupper (const mbchar_t mbc);
138 extern bool mb_isxdigit (const mbchar_t mbc);
139 extern int mb_width (const mbchar_t mbc);
140 extern void mb_putc (const mbchar_t mbc, FILE *stream);
141 extern void mb_setascii (mbchar_t *new, char sc);
142 extern void mb_copy (mbchar_t *new, const mbchar_t *old);
143 */
144
145#ifndef _MBCHAR_H
146#define _MBCHAR_H 1
147
148#include <stdbool.h>
149#include <string.h>
150
151/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
152 <wchar.h>.
153 BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before
154 <wchar.h>. */
155#include <stdio.h>
156#include <time.h>
157#include <wchar.h>
158#include <wctype.h>
159
160#include "wcwidth.h"
161
162#define MBCHAR_BUF_SIZE 24
163
164struct mbchar
165{
166 const char *ptr; /* pointer to current character */
167 size_t bytes; /* number of bytes of current character, > 0 */
168 bool wc_valid; /* true if wc is a valid wide character */
169 wchar_t wc; /* if wc_valid: the current character */
170 char buf[MBCHAR_BUF_SIZE]; /* room for the bytes, used for file input only */
171};
172
173/* EOF (not a real character) is represented with bytes = 0 and
174 wc_valid = false. */
175
176typedef struct mbchar mbchar_t;
177
178/* Access the current character. */
179#define mb_ptr(mbc) ((mbc).ptr)
180#define mb_len(mbc) ((mbc).bytes)
181
182/* Comparison of characters. */
183#define mb_iseq(mbc, sc) ((mbc).wc_valid && (mbc).wc == (sc))
184#define mb_isnul(mbc) ((mbc).wc_valid && (mbc).wc == 0)
185#define mb_cmp(mbc1, mbc2) \
186 ((mbc1).wc_valid \
187 ? ((mbc2).wc_valid \
188 ? (int) (mbc1).wc - (int) (mbc2).wc \
189 : -1) \
190 : ((mbc2).wc_valid \
191 ? 1 \
192 : (mbc1).bytes == (mbc2).bytes \
193 ? memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) \
194 : (mbc1).bytes < (mbc2).bytes \
195 ? (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) > 0 ? 1 : -1) \
196 : (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc2).bytes) >= 0 ? 1 : -1)))
197#define mb_casecmp(mbc1, mbc2) \
198 ((mbc1).wc_valid \
199 ? ((mbc2).wc_valid \
200 ? (int) towlower ((mbc1).wc) - (int) towlower ((mbc2).wc) \
201 : -1) \
202 : ((mbc2).wc_valid \
203 ? 1 \
204 : (mbc1).bytes == (mbc2).bytes \
205 ? memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) \
206 : (mbc1).bytes < (mbc2).bytes \
207 ? (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) > 0 ? 1 : -1) \
208 : (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc2).bytes) >= 0 ? 1 : -1)))
209#define mb_equal(mbc1, mbc2) \
210 ((mbc1).wc_valid && (mbc2).wc_valid \
211 ? (mbc1).wc == (mbc2).wc \
212 : (mbc1).bytes == (mbc2).bytes \
213 && memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) == 0)
214#define mb_caseequal(mbc1, mbc2) \
215 ((mbc1).wc_valid && (mbc2).wc_valid \
216 ? towlower ((mbc1).wc) == towlower ((mbc2).wc) \
217 : (mbc1).bytes == (mbc2).bytes \
218 && memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) == 0)
219
220/* <ctype.h>, <wctype.h> classification. */
221#define mb_isascii(mbc) \
222 ((mbc).wc_valid && (mbc).wc >= 0 && (mbc).wc <= 127)
223#define mb_isalnum(mbc) ((mbc).wc_valid && iswalnum ((mbc).wc))
224#define mb_isalpha(mbc) ((mbc).wc_valid && iswalpha ((mbc).wc))
225#define mb_isblank(mbc) ((mbc).wc_valid && iswblank ((mbc).wc))
226#define mb_iscntrl(mbc) ((mbc).wc_valid && iswcntrl ((mbc).wc))
227#define mb_isdigit(mbc) ((mbc).wc_valid && iswdigit ((mbc).wc))
228#define mb_isgraph(mbc) ((mbc).wc_valid && iswgraph ((mbc).wc))
229#define mb_islower(mbc) ((mbc).wc_valid && iswlower ((mbc).wc))
230#define mb_isprint(mbc) ((mbc).wc_valid && iswprint ((mbc).wc))
231#define mb_ispunct(mbc) ((mbc).wc_valid && iswpunct ((mbc).wc))
232#define mb_isspace(mbc) ((mbc).wc_valid && iswspace ((mbc).wc))
233#define mb_isupper(mbc) ((mbc).wc_valid && iswupper ((mbc).wc))
234#define mb_isxdigit(mbc) ((mbc).wc_valid && iswxdigit ((mbc).wc))
235
236/* Extra <wchar.h> function. */
237
238/* Unprintable characters appear as a small box of width 1. */
239#define MB_UNPRINTABLE_WIDTH 1
240
241static inline int
242mb_width_aux (wint_t wc)
243{
244 int w = wcwidth (wc);
245 /* For unprintable characters, arbitrarily return 0 for control characters
246 and MB_UNPRINTABLE_WIDTH otherwise. */
247 return (w >= 0 ? w : iswcntrl (wc) ? 0 : MB_UNPRINTABLE_WIDTH);
248}
249
250#define mb_width(mbc) \
251 ((mbc).wc_valid ? mb_width_aux ((mbc).wc) : MB_UNPRINTABLE_WIDTH)
252
253/* Output. */
254#define mb_putc(mbc, stream) fwrite ((mbc).ptr, 1, (mbc).bytes, (stream))
255
256/* Assignment. */
257#define mb_setascii(mbc, sc) \
258 ((mbc)->ptr = (mbc)->buf, (mbc)->bytes = 1, (mbc)->wc_valid = 1, \
259 (mbc)->wc = (mbc)->buf[0] = (sc))
260
261/* Copying a character. */
262static inline void
263mb_copy (mbchar_t *new_mbc, const mbchar_t *old_mbc)
264{
265 if (old_mbc->ptr == &old_mbc->buf[0])
266 {
267 memcpy (&new_mbc->buf[0], &old_mbc->buf[0], old_mbc->bytes);
268 new_mbc->ptr = &new_mbc->buf[0];
269 }
270 else
271 new_mbc->ptr = old_mbc->ptr;
272 new_mbc->bytes = old_mbc->bytes;
273 if ((new_mbc->wc_valid = old_mbc->wc_valid))
274 new_mbc->wc = old_mbc->wc;
275}
276
277
278/* is_basic(c) tests whether the single-byte character c is in the
279 ISO C "basic character set".
280 This is a convenience function, and is in this file only to share code
281 between mbiter_multi.h and mbfile_multi.h. */
282#if (' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
283 && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
284 && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
285 && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
286 && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
287 && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
288 && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
289 && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
290 && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
291 && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
292 && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
293 && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
294 && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
295 && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
296 && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
297 && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
298 && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
299 && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
300 && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
301 && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
302 && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
303 && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
304 && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126)
305/* The character set is ISO-646, not EBCDIC. */
306# define IS_BASIC_ASCII 1
307
308extern const unsigned int is_basic_table[];
309
310static inline bool
311is_basic (char c)
312{
313 return (is_basic_table [(unsigned char) c >> 5] >> ((unsigned char) c & 31))
314 & 1;
315}
316
317#else
318
319static inline bool
320is_basic (char c)
321{
322 switch (c)
323 {
324 case '\t': case '\v': case '\f':
325 case ' ': case '!': case '"': case '#': case '%':
326 case '&': case '\'': case '(': case ')': case '*':
327 case '+': case ',': case '-': case '.': case '/':
328 case '0': case '1': case '2': case '3': case '4':
329 case '5': case '6': case '7': case '8': case '9':
330 case ':': case ';': case '<': case '=': case '>':
331 case '?':
332 case 'A': case 'B': case 'C': case 'D': case 'E':
333 case 'F': case 'G': case 'H': case 'I': case 'J':
334 case 'K': case 'L': case 'M': case 'N': case 'O':
335 case 'P': case 'Q': case 'R': case 'S': case 'T':
336 case 'U': case 'V': case 'W': case 'X': case 'Y':
337 case 'Z':
338 case '[': case '\\': case ']': case '^': case '_':
339 case 'a': case 'b': case 'c': case 'd': case 'e':
340 case 'f': case 'g': case 'h': case 'i': case 'j':
341 case 'k': case 'l': case 'm': case 'n': case 'o':
342 case 'p': case 'q': case 'r': case 's': case 't':
343 case 'u': case 'v': case 'w': case 'x': case 'y':
344 case 'z': case '{': case '|': case '}': case '~':
345 return 1;
346 default:
347 return 0;
348 }
349}
350
351#endif
352
353#endif /* _MBCHAR_H */