1 /* A GNU-like <string.h>.
3 Copyright (C) 1995-1996, 2001-2007 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
21 /* The include_next requires a split double-inclusion guard. */
22 #if @HAVE_INCLUDE_NEXT@
23 # include_next <string.h>
25 # include @ABSOLUTE_STRING_H@
32 /* The definition of GL_LINK_WARNING is copied here. */
39 /* Return the first occurrence of NEEDLE in HAYSTACK. */
41 # if ! @HAVE_DECL_MEMMEM@
42 extern void *memmem (void const *__haystack, size_t __haystack_len,
43 void const *__needle, size_t __needle_len);
45 #elif defined GNULIB_POSIXCHECK
47 # define memmem(a,al,b,bl) \
48 (GL_LINK_WARNING ("memmem is unportable - " \
49 "use gnulib module memmem for portability"), \
50 memmem (a, al, b, bl))
53 /* Copy N bytes of SRC to DEST, return pointer to bytes after the
57 extern void *mempcpy (void *restrict __dest, void const *restrict __src,
60 #elif defined GNULIB_POSIXCHECK
62 # define mempcpy(a,b,n) \
63 (GL_LINK_WARNING ("mempcpy is unportable - " \
64 "use gnulib module mempcpy for portability"), \
68 /* Search backwards through a block for a byte (specified as an int). */
70 # if ! @HAVE_DECL_MEMRCHR@
71 extern void *memrchr (void const *, int, size_t);
73 #elif defined GNULIB_POSIXCHECK
75 # define memrchr(a,b,c) \
76 (GL_LINK_WARNING ("memrchr is unportable - " \
77 "use gnulib module memrchr for portability"), \
81 /* Copy SRC to DST, returning the address of the terminating '\0' in DST. */
84 extern char *stpcpy (char *restrict __dst, char const *restrict __src);
86 #elif defined GNULIB_POSIXCHECK
88 # define stpcpy(a,b) \
89 (GL_LINK_WARNING ("stpcpy is unportable - " \
90 "use gnulib module stpcpy for portability"), \
94 /* Copy no more than N bytes of SRC to DST, returning a pointer past the
95 last non-NUL byte written into DST. */
98 # define stpncpy gnu_stpncpy
99 extern char *stpncpy (char *restrict __dst, char const *restrict __src,
102 #elif defined GNULIB_POSIXCHECK
104 # define stpncpy(a,b,n) \
105 (GL_LINK_WARNING ("stpncpy is unportable - " \
106 "use gnulib module stpncpy for portability"), \
110 /* Compare strings S1 and S2, ignoring case, returning less than, equal to or
111 greater than zero if S1 is lexicographically less than, equal to or greater
113 Note: This function does not work in multibyte locales. */
114 #if ! @HAVE_STRCASECMP@
115 extern int strcasecmp (char const *s1, char const *s2);
117 #if defined GNULIB_POSIXCHECK
118 /* strcasecmp() does not work with multibyte strings:
119 POSIX says that it operates on "strings", and "string" in POSIX is defined
120 as a sequence of bytes, not of characters. */
122 # define strcasecmp(a,b) \
123 (GL_LINK_WARNING ("strcasecmp cannot work correctly on character strings " \
124 "in multibyte locales - " \
125 "use mbscasecmp if you care about " \
126 "internationalization, or use c_strcasecmp (from " \
127 "gnulib module c-strcase) if you want a locale " \
128 "independent function"), \
132 /* Compare no more than N bytes of strings S1 and S2, ignoring case,
133 returning less than, equal to or greater than zero if S1 is
134 lexicographically less than, equal to or greater than S2.
135 Note: This function cannot work correctly in multibyte locales. */
136 #if ! @HAVE_DECL_STRNCASECMP@
137 extern int strncasecmp (char const *s1, char const *s2, size_t n);
139 #if defined GNULIB_POSIXCHECK
140 /* strncasecmp() does not work with multibyte strings:
141 POSIX says that it operates on "strings", and "string" in POSIX is defined
142 as a sequence of bytes, not of characters. */
144 # define strncasecmp(a,b,n) \
145 (GL_LINK_WARNING ("strncasecmp cannot work correctly on character " \
146 "strings in multibyte locales - " \
147 "use mbsncasecmp or mbspcasecmp if you care about " \
148 "internationalization, or use c_strncasecmp (from " \
149 "gnulib module c-strcase) if you want a locale " \
150 "independent function"), \
151 strncasecmp (a, b, n))
154 #if defined GNULIB_POSIXCHECK
155 /* strchr() does not work with multibyte strings if the locale encoding is
156 GB18030 and the character to be searched is a digit. */
158 # define strchr(s,c) \
159 (GL_LINK_WARNING ("strchr cannot work correctly on character strings " \
160 "in some multibyte locales - " \
161 "use mbschr if you care about internationalization"), \
165 /* Find the first occurrence of C in S or the final NUL byte. */
166 #if @GNULIB_STRCHRNUL@
167 # if ! @HAVE_STRCHRNUL@
168 extern char *strchrnul (char const *__s, int __c_in);
170 #elif defined GNULIB_POSIXCHECK
172 # define strchrnul(a,b) \
173 (GL_LINK_WARNING ("strchrnul is unportable - " \
174 "use gnulib module strchrnul for portability"), \
178 /* Duplicate S, returning an identical malloc'd string. */
180 # if ! @HAVE_DECL_STRDUP@ && ! defined strdup
181 extern char *strdup (char const *__s);
183 #elif defined GNULIB_POSIXCHECK
186 (GL_LINK_WARNING ("strdup is unportable - " \
187 "use gnulib module strdup for portability"), \
191 /* Return a newly allocated copy of at most N bytes of STRING. */
193 # if ! @HAVE_STRNDUP@
195 # define strndup rpl_strndup
197 # if ! @HAVE_STRNDUP@ || ! @HAVE_DECL_STRNDUP@
198 extern char *strndup (char const *__string, size_t __n);
200 #elif defined GNULIB_POSIXCHECK
202 # define strndup(a,n) \
203 (GL_LINK_WARNING ("strndup is unportable - " \
204 "use gnulib module strndup for portability"), \
208 /* Find the length (number of bytes) of STRING, but scan at most
209 MAXLEN bytes. If no '\0' terminator is found in that many bytes,
212 # if ! @HAVE_DECL_STRNLEN@
213 extern size_t strnlen (char const *__string, size_t __maxlen);
215 #elif defined GNULIB_POSIXCHECK
217 # define strnlen(a,n) \
218 (GL_LINK_WARNING ("strnlen is unportable - " \
219 "use gnulib module strnlen for portability"), \
223 #if defined GNULIB_POSIXCHECK
224 /* strcspn() assumes the second argument is a list of single-byte characters.
225 Even in this simple case, it does not work with multibyte strings if the
226 locale encoding is GB18030 and one of the characters to be searched is a
229 # define strcspn(s,a) \
230 (GL_LINK_WARNING ("strcspn cannot work correctly on character strings " \
231 "in multibyte locales - " \
232 "use mbscspn if you care about internationalization"), \
236 /* Find the first occurrence in S of any character in ACCEPT. */
238 # if ! @HAVE_STRPBRK@
239 extern char *strpbrk (char const *__s, char const *__accept);
241 # if defined GNULIB_POSIXCHECK
242 /* strpbrk() assumes the second argument is a list of single-byte characters.
243 Even in this simple case, it does not work with multibyte strings if the
244 locale encoding is GB18030 and one of the characters to be searched is a
247 # define strpbrk(s,a) \
248 (GL_LINK_WARNING ("strpbrk cannot work correctly on character strings " \
249 "in multibyte locales - " \
250 "use mbspbrk if you care about internationalization"), \
253 #elif defined GNULIB_POSIXCHECK
255 # define strpbrk(s,a) \
256 (GL_LINK_WARNING ("strpbrk is unportable - " \
257 "use gnulib module strpbrk for portability"), \
261 #if defined GNULIB_POSIXCHECK
262 /* strspn() assumes the second argument is a list of single-byte characters.
263 Even in this simple case, it cannot work with multibyte strings. */
265 # define strspn(s,a) \
266 (GL_LINK_WARNING ("strspn cannot work correctly on character strings " \
267 "in multibyte locales - " \
268 "use mbsspn if you care about internationalization"), \
272 #if defined GNULIB_POSIXCHECK
273 /* strrchr() does not work with multibyte strings if the locale encoding is
274 GB18030 and the character to be searched is a digit. */
276 # define strrchr(s,c) \
277 (GL_LINK_WARNING ("strrchr cannot work correctly on character strings " \
278 "in some multibyte locales - " \
279 "use mbsrchr if you care about internationalization"), \
283 /* Search the next delimiter (char listed in DELIM) starting at *STRINGP.
284 If one is found, overwrite it with a NUL, and advance *STRINGP
285 to point to the next char after it. Otherwise, set *STRINGP to NULL.
286 If *STRINGP was already NULL, nothing happens.
287 Return the old value of *STRINGP.
289 This is a variant of strtok() that is multithread-safe and supports
292 Caveat: It modifies the original string.
293 Caveat: These functions cannot be used on constant strings.
294 Caveat: The identity of the delimiting character is lost.
295 Caveat: It doesn't work with multibyte strings unless all of the delimiter
296 characters are ASCII characters < 0x30.
298 See also strtok_r(). */
301 extern char *strsep (char **restrict __stringp, char const *restrict __delim);
303 # if defined GNULIB_POSIXCHECK
305 # define strsep(s,d) \
306 (GL_LINK_WARNING ("strsep cannot work correctly on character strings " \
307 "in multibyte locales - " \
308 "use mbssep if you care about internationalization"), \
311 #elif defined GNULIB_POSIXCHECK
313 # define strsep(s,d) \
314 (GL_LINK_WARNING ("strsep is unportable - " \
315 "use gnulib module strsep for portability"), \
319 #if defined GNULIB_POSIXCHECK
320 /* strstr() does not work with multibyte strings if the locale encoding is
321 different from UTF-8:
322 POSIX says that it operates on "strings", and "string" in POSIX is defined
323 as a sequence of bytes, not of characters. */
325 # define strstr(a,b) \
326 (GL_LINK_WARNING ("strstr cannot work correctly on character strings " \
327 "in most multibyte locales - " \
328 "use mbsstr if you care about internationalization"), \
332 /* Find the first occurrence of NEEDLE in HAYSTACK, using case-insensitive
334 #if ! @HAVE_STRCASESTR@
335 extern char *strcasestr (const char *haystack, const char *needle);
337 #if defined GNULIB_POSIXCHECK
338 /* strcasestr() does not work with multibyte strings:
339 It is a glibc extension, and glibc implements it only for unibyte
342 # define strcasestr(a,b) \
343 (GL_LINK_WARNING ("strcasestr does work correctly on character strings " \
344 "in multibyte locales - " \
345 "use mbscasestr if you care about " \
346 "internationalization, or use c-strcasestr if you want " \
347 "a locale independent function"), \
351 /* Parse S into tokens separated by characters in DELIM.
352 If S is NULL, the saved pointer in SAVE_PTR is used as
353 the next starting point. For example:
354 char s[] = "-abc-=-def";
356 x = strtok_r(s, "-", &sp); // x = "abc", sp = "=-def"
357 x = strtok_r(NULL, "-=", &sp); // x = "def", sp = NULL
358 x = strtok_r(NULL, "=", &sp); // x = NULL
361 This is a variant of strtok() that is multithread-safe.
363 For the POSIX documentation for this function, see:
364 http://www.opengroup.org/susv3xsh/strtok.html
366 Caveat: It modifies the original string.
367 Caveat: These functions cannot be used on constant strings.
368 Caveat: The identity of the delimiting character is lost.
369 Caveat: It doesn't work with multibyte strings unless all of the delimiter
370 characters are ASCII characters < 0x30.
372 See also strsep(). */
373 #if @GNULIB_STRTOK_R@
374 # if ! @HAVE_DECL_STRTOK_R@
375 extern char *strtok_r (char *restrict s, char const *restrict delim,
376 char **restrict save_ptr);
378 # if defined GNULIB_POSIXCHECK
380 # define strtok_r(s,d,p) \
381 (GL_LINK_WARNING ("strtok_r cannot work correctly on character strings " \
382 "in multibyte locales - " \
383 "use mbstok_r if you care about internationalization"), \
386 #elif defined GNULIB_POSIXCHECK
388 # define strtok_r(s,d,p) \
389 (GL_LINK_WARNING ("strtok_r is unportable - " \
390 "use gnulib module strtok_r for portability"), \
395 /* The following functions are not specified by POSIX. They are gnulib
399 /* Return the number of multibyte characters in the character string STRING.
400 This considers multibyte characters, unlike strlen, which counts bytes. */
401 extern size_t mbslen (const char *string);
405 /* Locate the first single-byte character C in the character string STRING,
406 and return a pointer to it. Return NULL if C is not found in STRING.
407 Unlike strchr(), this function works correctly in multibyte locales with
408 encodings such as GB18030. */
409 # define mbschr rpl_mbschr /* avoid collision with HP-UX function */
410 extern char * mbschr (const char *string, int c);
414 /* Locate the last single-byte character C in the character string STRING,
415 and return a pointer to it. Return NULL if C is not found in STRING.
416 Unlike strrchr(), this function works correctly in multibyte locales with
417 encodings such as GB18030. */
418 # define mbsrchr rpl_mbsrchr /* avoid collision with HP-UX function */
419 extern char * mbsrchr (const char *string, int c);
423 /* Find the first occurrence of the character string NEEDLE in the character
424 string HAYSTACK. Return NULL if NEEDLE is not found in HAYSTACK.
425 Unlike strstr(), this function works correctly in multibyte locales with
426 encodings different from UTF-8. */
427 extern char * mbsstr (const char *haystack, const char *needle);
430 #if @GNULIB_MBSCASECMP@
431 /* Compare the character strings S1 and S2, ignoring case, returning less than,
432 equal to or greater than zero if S1 is lexicographically less than, equal to
434 Note: This function may, in multibyte locales, return 0 for strings of
436 Unlike strcasecmp(), this function works correctly in multibyte locales. */
437 extern int mbscasecmp (const char *s1, const char *s2);
440 #if @GNULIB_MBSNCASECMP@
441 /* Compare the initial segment of the character string S1 consisting of at most
442 N characters with the initial segment of the character string S2 consisting
443 of at most N characters, ignoring case, returning less than, equal to or
444 greater than zero if the initial segment of S1 is lexicographically less
445 than, equal to or greater than the initial segment of S2.
446 Note: This function may, in multibyte locales, return 0 for initial segments
447 of different lengths!
448 Unlike strncasecmp(), this function works correctly in multibyte locales.
449 But beware that N is not a byte count but a character count! */
450 extern int mbsncasecmp (const char *s1, const char *s2, size_t n);
453 #if @GNULIB_MBSPCASECMP@
454 /* Compare the initial segment of the character string STRING consisting of
455 at most mbslen (PREFIX) characters with the character string PREFIX,
456 ignoring case, returning less than, equal to or greater than zero if this
457 initial segment is lexicographically less than, equal to or greater than
459 Note: This function may, in multibyte locales, return 0 if STRING is of
460 smaller length than PREFIX!
461 Unlike strncasecmp(), this function works correctly in multibyte
463 extern char * mbspcasecmp (const char *string, const char *prefix);
466 #if @GNULIB_MBSCASESTR@
467 /* Find the first occurrence of the character string NEEDLE in the character
468 string HAYSTACK, using case-insensitive comparison.
469 Note: This function may, in multibyte locales, return success even if
470 strlen (haystack) < strlen (needle) !
471 Unlike strcasestr(), this function works correctly in multibyte locales. */
472 extern char * mbscasestr (const char *haystack, const char *needle);
476 /* Find the first occurrence in the character string STRING of any character
477 in the character string ACCEPT. Return the number of bytes from the
478 beginning of the string to this occurrence, or to the end of the string
480 Unlike strcspn(), this function works correctly in multibyte locales. */
481 extern size_t mbscspn (const char *string, const char *accept);
485 /* Find the first occurrence in the character string STRING of any character
486 in the character string ACCEPT. Return the pointer to it, or NULL if none
488 Unlike strpbrk(), this function works correctly in multibyte locales. */
489 # define mbspbrk rpl_mbspbrk /* avoid collision with HP-UX function */
490 extern char * mbspbrk (const char *string, const char *accept);
494 /* Find the first occurrence in the character string STRING of any character
495 not in the character string REJECT. Return the number of bytes from the
496 beginning of the string to this occurrence, or to the end of the string
498 Unlike strspn(), this function works correctly in multibyte locales. */
499 extern size_t mbsspn (const char *string, const char *reject);
503 /* Search the next delimiter (multibyte character listed in the character
504 string DELIM) starting at the character string *STRINGP.
505 If one is found, overwrite it with a NUL, and advance *STRINGP to point
506 to the next multibyte character after it. Otherwise, set *STRINGP to NULL.
507 If *STRINGP was already NULL, nothing happens.
508 Return the old value of *STRINGP.
510 This is a variant of mbstok_r() that supports empty fields.
512 Caveat: It modifies the original string.
513 Caveat: These functions cannot be used on constant strings.
514 Caveat: The identity of the delimiting character is lost.
516 See also mbstok_r(). */
517 extern char * mbssep (char **stringp, const char *delim);
520 #if @GNULIB_MBSTOK_R@
521 /* Parse the character string STRING into tokens separated by characters in
522 the character string DELIM.
523 If STRING is NULL, the saved pointer in SAVE_PTR is used as
524 the next starting point. For example:
525 char s[] = "-abc-=-def";
527 x = mbstok_r(s, "-", &sp); // x = "abc", sp = "=-def"
528 x = mbstok_r(NULL, "-=", &sp); // x = "def", sp = NULL
529 x = mbstok_r(NULL, "=", &sp); // x = NULL
532 Caveat: It modifies the original string.
533 Caveat: These functions cannot be used on constant strings.
534 Caveat: The identity of the delimiting character is lost.
536 See also mbssep(). */
537 extern char * mbstok_r (char *string, const char *delim, char **save_ptr);
545 #endif /* _GL_STRING_H */
546 #endif /* _GL_STRING_H */