Mercurial > gnulib
annotate lib/mbuiter.h @ 40057:b06060465f09
maint: Run 'make update-copyright'
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Tue, 01 Jan 2019 00:25:11 +0100 |
| parents | 10eb9086bea0 |
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| rev | line source |
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| 6055 | 1 /* Iterating through multibyte strings: macros for multi-byte encodings. |
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2 Copyright (C) 2001, 2005, 2007, 2009-2019 Free Software Foundation, Inc. |
| 6055 | 3 |
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4 This program is free software: you can redistribute it and/or modify |
| 6055 | 5 it under the terms of the GNU General Public License as published by |
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6 the Free Software Foundation; either version 3 of the License, or |
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7 (at your option) any later version. |
| 6055 | 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 | |
| 19190 | 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 6055 | 16 |
| 17 /* Written by Bruno Haible <bruno@clisp.org>. */ | |
| 18 | |
| 19 /* The macros in this file implement forward iteration through a | |
| 20 multi-byte string, without knowing its length a-priori. | |
| 21 | |
| 22 With these macros, an iteration loop that looks like | |
| 23 | |
| 24 char *iter; | |
| 25 for (iter = buf; *iter != '\0'; iter++) | |
| 26 { | |
| 27 do_something (*iter); | |
| 28 } | |
| 29 | |
| 30 becomes | |
| 31 | |
| 32 mbui_iterator_t iter; | |
| 33 for (mbui_init (iter, buf); mbui_avail (iter); mbui_advance (iter)) | |
| 34 { | |
| 35 do_something (mbui_cur_ptr (iter), mb_len (mbui_cur (iter))); | |
| 36 } | |
| 37 | |
| 38 The benefit of these macros over plain use of mbrtowc is: | |
| 39 - Handling of invalid multibyte sequences is possible without | |
| 40 making the code more complicated, while still preserving the | |
| 41 invalid multibyte sequences. | |
| 42 | |
| 43 Compared to mbiter.h, the macros here don't need to know the string's | |
| 44 length a-priori. The downside is that at each step, the look-ahead | |
| 45 that guards against overrunning the terminating '\0' is more expensive. | |
| 46 The mbui_* macros are therefore suitable when there is a high probability | |
| 47 that only the first few multibyte characters need to be inspected. | |
| 48 Whereas the mbi_* macros are better if usually the iteration runs | |
| 49 through the entire string. | |
| 50 | |
| 51 mbui_iterator_t | |
| 52 is a type usable for variable declarations. | |
| 53 | |
| 54 mbui_init (iter, startptr) | |
| 55 initializes the iterator, starting at startptr. | |
| 56 | |
| 57 mbui_avail (iter) | |
| 16358 | 58 returns true if there are more multibyte characters available before |
| 6055 | 59 the end of string is reached. In this case, mbui_cur (iter) is |
| 16358 | 60 initialized to the next multibyte character. |
| 6055 | 61 |
| 62 mbui_advance (iter) | |
| 63 advances the iterator by one multibyte character. | |
| 64 | |
| 65 mbui_cur (iter) | |
| 66 returns the current multibyte character, of type mbchar_t. All the | |
| 67 macros defined in mbchar.h can be used on it. | |
| 68 | |
| 69 mbui_cur_ptr (iter) | |
| 70 return a pointer to the beginning of the current multibyte character. | |
| 71 | |
| 72 mbui_reloc (iter, ptrdiff) | |
| 73 relocates iterator when the string is moved by ptrdiff bytes. | |
| 74 | |
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75 mbui_copy (&destiter, &srciter) |
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76 copies srciter to destiter. |
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77 |
| 6055 | 78 Here are the function prototypes of the macros. |
| 79 | |
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80 extern void mbui_init (mbui_iterator_t iter, const char *startptr); |
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81 extern bool mbui_avail (mbui_iterator_t iter); |
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82 extern void mbui_advance (mbui_iterator_t iter); |
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83 extern mbchar_t mbui_cur (mbui_iterator_t iter); |
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84 extern const char * mbui_cur_ptr (mbui_iterator_t iter); |
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85 extern void mbui_reloc (mbui_iterator_t iter, ptrdiff_t ptrdiff); |
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86 extern void mbui_copy (mbui_iterator_t *new, const mbui_iterator_t *old); |
| 6055 | 87 */ |
| 88 | |
| 89 #ifndef _MBUITER_H | |
| 90 #define _MBUITER_H 1 | |
| 91 | |
| 92 #include <assert.h> | |
| 93 #include <stdbool.h> | |
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94 #include <stddef.h> |
| 6055 | 95 #include <stdlib.h> |
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96 #include <string.h> |
| 6055 | 97 |
| 98 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before | |
| 99 <wchar.h>. | |
| 100 BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before | |
| 101 <wchar.h>. */ | |
| 102 #include <stdio.h> | |
| 103 #include <time.h> | |
| 104 #include <wchar.h> | |
| 105 | |
| 106 #include "mbchar.h" | |
| 107 #include "strnlen1.h" | |
| 108 | |
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109 #ifndef _GL_INLINE_HEADER_BEGIN |
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110 #error "Please include config.h first." |
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111 #endif |
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112 _GL_INLINE_HEADER_BEGIN |
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113 #ifndef MBUITER_INLINE |
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114 # define MBUITER_INLINE _GL_INLINE |
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115 #endif |
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116 |
| 6055 | 117 struct mbuiter_multi |
| 118 { | |
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119 bool in_shift; /* true if next byte may not be interpreted as ASCII */ |
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120 mbstate_t state; /* if in_shift: current shift state */ |
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121 bool next_done; /* true if mbui_avail has already filled the following */ |
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122 struct mbchar cur; /* the current character: |
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123 const char *cur.ptr pointer to current character |
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124 The following are only valid after mbui_avail. |
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125 size_t cur.bytes number of bytes of current character |
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126 bool cur.wc_valid true if wc is a valid wide character |
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127 wchar_t cur.wc if wc_valid: the current character |
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128 */ |
| 6055 | 129 }; |
| 130 | |
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131 MBUITER_INLINE void |
| 6055 | 132 mbuiter_multi_next (struct mbuiter_multi *iter) |
| 133 { | |
| 134 if (iter->next_done) | |
| 135 return; | |
| 136 if (iter->in_shift) | |
| 137 goto with_shift; | |
| 138 /* Handle most ASCII characters quickly, without calling mbrtowc(). */ | |
| 139 if (is_basic (*iter->cur.ptr)) | |
| 140 { | |
| 141 /* These characters are part of the basic character set. ISO C 99 | |
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142 guarantees that their wide character code is identical to their |
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143 char code. */ |
| 6055 | 144 iter->cur.bytes = 1; |
| 145 iter->cur.wc = *iter->cur.ptr; | |
| 146 iter->cur.wc_valid = true; | |
| 147 } | |
| 148 else | |
| 149 { | |
| 150 assert (mbsinit (&iter->state)); | |
| 151 iter->in_shift = true; | |
| 152 with_shift: | |
| 153 iter->cur.bytes = mbrtowc (&iter->cur.wc, iter->cur.ptr, | |
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154 strnlen1 (iter->cur.ptr, MB_CUR_MAX), |
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155 &iter->state); |
| 6055 | 156 if (iter->cur.bytes == (size_t) -1) |
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157 { |
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158 /* An invalid multibyte sequence was encountered. */ |
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159 iter->cur.bytes = 1; |
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160 iter->cur.wc_valid = false; |
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161 /* Whether to set iter->in_shift = false and reset iter->state |
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162 or not is not very important; the string is bogus anyway. */ |
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163 } |
| 6055 | 164 else if (iter->cur.bytes == (size_t) -2) |
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165 { |
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166 /* An incomplete multibyte character at the end. */ |
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167 iter->cur.bytes = strlen (iter->cur.ptr); |
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168 iter->cur.wc_valid = false; |
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169 /* Whether to set iter->in_shift = false and reset iter->state |
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170 or not is not important; the string end is reached anyway. */ |
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171 } |
| 6055 | 172 else |
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173 { |
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174 if (iter->cur.bytes == 0) |
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175 { |
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176 /* A null wide character was encountered. */ |
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177 iter->cur.bytes = 1; |
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178 assert (*iter->cur.ptr == '\0'); |
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179 assert (iter->cur.wc == 0); |
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180 } |
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181 iter->cur.wc_valid = true; |
| 6055 | 182 |
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183 /* When in the initial state, we can go back treating ASCII |
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184 characters more quickly. */ |
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185 if (mbsinit (&iter->state)) |
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186 iter->in_shift = false; |
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187 } |
| 6055 | 188 } |
| 189 iter->next_done = true; | |
| 190 } | |
| 191 | |
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192 MBUITER_INLINE void |
| 6055 | 193 mbuiter_multi_reloc (struct mbuiter_multi *iter, ptrdiff_t ptrdiff) |
| 194 { | |
| 195 iter->cur.ptr += ptrdiff; | |
| 196 } | |
| 197 | |
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198 MBUITER_INLINE void |
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199 mbuiter_multi_copy (struct mbuiter_multi *new_iter, const struct mbuiter_multi *old_iter) |
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200 { |
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201 if ((new_iter->in_shift = old_iter->in_shift)) |
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202 memcpy (&new_iter->state, &old_iter->state, sizeof (mbstate_t)); |
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203 else |
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204 memset (&new_iter->state, 0, sizeof (mbstate_t)); |
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205 new_iter->next_done = old_iter->next_done; |
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206 mb_copy (&new_iter->cur, &old_iter->cur); |
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207 } |
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208 |
| 6055 | 209 /* Iteration macros. */ |
| 210 typedef struct mbuiter_multi mbui_iterator_t; | |
| 211 #define mbui_init(iter, startptr) \ | |
| 212 ((iter).cur.ptr = (startptr), \ | |
| 213 (iter).in_shift = false, memset (&(iter).state, '\0', sizeof (mbstate_t)), \ | |
| 214 (iter).next_done = false) | |
| 215 #define mbui_avail(iter) \ | |
| 216 (mbuiter_multi_next (&(iter)), !mb_isnul ((iter).cur)) | |
| 217 #define mbui_advance(iter) \ | |
| 218 ((iter).cur.ptr += (iter).cur.bytes, (iter).next_done = false) | |
| 219 | |
| 220 /* Access to the current character. */ | |
| 221 #define mbui_cur(iter) (iter).cur | |
| 222 #define mbui_cur_ptr(iter) (iter).cur.ptr | |
| 223 | |
| 224 /* Relocation. */ | |
| 225 #define mbui_reloc(iter, ptrdiff) mbuiter_multi_reloc (&iter, ptrdiff) | |
| 226 | |
|
8127
127a096061c8
Support for copying multibyte string iterators.
Bruno Haible <bruno@clisp.org>
parents:
6055
diff
changeset
|
227 /* Copying an iterator. */ |
|
127a096061c8
Support for copying multibyte string iterators.
Bruno Haible <bruno@clisp.org>
parents:
6055
diff
changeset
|
228 #define mbui_copy mbuiter_multi_copy |
|
127a096061c8
Support for copying multibyte string iterators.
Bruno Haible <bruno@clisp.org>
parents:
6055
diff
changeset
|
229 |
|
17102
9e72d3927af1
binary-io, eealloc, mbfile, mbiter, mbutil, xsize: better 'inline'
Paul Eggert <eggert@cs.ucla.edu>
parents:
16358
diff
changeset
|
230 _GL_INLINE_HEADER_END |
|
9e72d3927af1
binary-io, eealloc, mbfile, mbiter, mbutil, xsize: better 'inline'
Paul Eggert <eggert@cs.ucla.edu>
parents:
16358
diff
changeset
|
231 |
| 6055 | 232 #endif /* _MBUITER_H */ |