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 #@INCLUDE_NEXT@ @NEXT_STRING_H@
28 /* The definition of GL_LINK_WARNING is copied here. */
36 /* Return the first occurrence of NEEDLE in HAYSTACK. */
39 # define memmem rpl_memmem
41 # if ! @HAVE_DECL_MEMMEM@ || @REPLACE_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 #if defined GNULIB_POSIXCHECK
111 /* strchr() does not work with multibyte strings if the locale encoding is
112 GB18030 and the character to be searched is a digit. */
114 # define strchr(s,c) \
115 (GL_LINK_WARNING ("strchr cannot work correctly on character strings " \
116 "in some multibyte locales - " \
117 "use mbschr if you care about internationalization"), \
121 /* Find the first occurrence of C in S or the final NUL byte. */
122 #if @GNULIB_STRCHRNUL@
123 # if ! @HAVE_STRCHRNUL@
124 extern char *strchrnul (char const *__s, int __c_in);
126 #elif defined GNULIB_POSIXCHECK
128 # define strchrnul(a,b) \
129 (GL_LINK_WARNING ("strchrnul is unportable - " \
130 "use gnulib module strchrnul for portability"), \
134 /* Duplicate S, returning an identical malloc'd string. */
136 # if ! @HAVE_DECL_STRDUP@ && ! defined strdup
137 extern char *strdup (char const *__s);
139 #elif defined GNULIB_POSIXCHECK
142 (GL_LINK_WARNING ("strdup is unportable - " \
143 "use gnulib module strdup for portability"), \
147 /* Return a newly allocated copy of at most N bytes of STRING. */
149 # if ! @HAVE_STRNDUP@
151 # define strndup rpl_strndup
153 # if ! @HAVE_STRNDUP@ || ! @HAVE_DECL_STRNDUP@
154 extern char *strndup (char const *__string, size_t __n);
156 #elif defined GNULIB_POSIXCHECK
158 # define strndup(a,n) \
159 (GL_LINK_WARNING ("strndup is unportable - " \
160 "use gnulib module strndup for portability"), \
164 /* Find the length (number of bytes) of STRING, but scan at most
165 MAXLEN bytes. If no '\0' terminator is found in that many bytes,
168 # if ! @HAVE_DECL_STRNLEN@
169 extern size_t strnlen (char const *__string, size_t __maxlen);
171 #elif defined GNULIB_POSIXCHECK
173 # define strnlen(a,n) \
174 (GL_LINK_WARNING ("strnlen is unportable - " \
175 "use gnulib module strnlen for portability"), \
179 #if defined GNULIB_POSIXCHECK
180 /* strcspn() assumes the second argument is a list of single-byte characters.
181 Even in this simple case, it does not work with multibyte strings if the
182 locale encoding is GB18030 and one of the characters to be searched is a
185 # define strcspn(s,a) \
186 (GL_LINK_WARNING ("strcspn cannot work correctly on character strings " \
187 "in multibyte locales - " \
188 "use mbscspn if you care about internationalization"), \
192 /* Find the first occurrence in S of any character in ACCEPT. */
194 # if ! @HAVE_STRPBRK@
195 extern char *strpbrk (char const *__s, char const *__accept);
197 # if defined GNULIB_POSIXCHECK
198 /* strpbrk() assumes the second argument is a list of single-byte characters.
199 Even in this simple case, it does not work with multibyte strings if the
200 locale encoding is GB18030 and one of the characters to be searched is a
203 # define strpbrk(s,a) \
204 (GL_LINK_WARNING ("strpbrk cannot work correctly on character strings " \
205 "in multibyte locales - " \
206 "use mbspbrk if you care about internationalization"), \
209 #elif defined GNULIB_POSIXCHECK
211 # define strpbrk(s,a) \
212 (GL_LINK_WARNING ("strpbrk is unportable - " \
213 "use gnulib module strpbrk for portability"), \
217 #if defined GNULIB_POSIXCHECK
218 /* strspn() assumes the second argument is a list of single-byte characters.
219 Even in this simple case, it cannot work with multibyte strings. */
221 # define strspn(s,a) \
222 (GL_LINK_WARNING ("strspn cannot work correctly on character strings " \
223 "in multibyte locales - " \
224 "use mbsspn if you care about internationalization"), \
228 #if defined GNULIB_POSIXCHECK
229 /* strrchr() does not work with multibyte strings if the locale encoding is
230 GB18030 and the character to be searched is a digit. */
232 # define strrchr(s,c) \
233 (GL_LINK_WARNING ("strrchr cannot work correctly on character strings " \
234 "in some multibyte locales - " \
235 "use mbsrchr if you care about internationalization"), \
239 /* Search the next delimiter (char listed in DELIM) starting at *STRINGP.
240 If one is found, overwrite it with a NUL, and advance *STRINGP
241 to point to the next char after it. Otherwise, set *STRINGP to NULL.
242 If *STRINGP was already NULL, nothing happens.
243 Return the old value of *STRINGP.
245 This is a variant of strtok() that is multithread-safe and supports
248 Caveat: It modifies the original string.
249 Caveat: These functions cannot be used on constant strings.
250 Caveat: The identity of the delimiting character is lost.
251 Caveat: It doesn't work with multibyte strings unless all of the delimiter
252 characters are ASCII characters < 0x30.
254 See also strtok_r(). */
257 extern char *strsep (char **restrict __stringp, char const *restrict __delim);
259 # if defined GNULIB_POSIXCHECK
261 # define strsep(s,d) \
262 (GL_LINK_WARNING ("strsep cannot work correctly on character strings " \
263 "in multibyte locales - " \
264 "use mbssep if you care about internationalization"), \
267 #elif defined GNULIB_POSIXCHECK
269 # define strsep(s,d) \
270 (GL_LINK_WARNING ("strsep is unportable - " \
271 "use gnulib module strsep for portability"), \
275 #if defined GNULIB_POSIXCHECK
276 /* strstr() does not work with multibyte strings if the locale encoding is
277 different from UTF-8:
278 POSIX says that it operates on "strings", and "string" in POSIX is defined
279 as a sequence of bytes, not of characters. */
281 # define strstr(a,b) \
282 (GL_LINK_WARNING ("strstr cannot work correctly on character strings " \
283 "in most multibyte locales - " \
284 "use mbsstr if you care about internationalization"), \
288 /* Find the first occurrence of NEEDLE in HAYSTACK, using case-insensitive
290 #if ! @HAVE_STRCASESTR@
291 extern char *strcasestr (const char *haystack, const char *needle);
293 #if defined GNULIB_POSIXCHECK
294 /* strcasestr() does not work with multibyte strings:
295 It is a glibc extension, and glibc implements it only for unibyte
298 # define strcasestr(a,b) \
299 (GL_LINK_WARNING ("strcasestr does work correctly on character strings " \
300 "in multibyte locales - " \
301 "use mbscasestr if you care about " \
302 "internationalization, or use c-strcasestr if you want " \
303 "a locale independent function"), \
307 /* Parse S into tokens separated by characters in DELIM.
308 If S is NULL, the saved pointer in SAVE_PTR is used as
309 the next starting point. For example:
310 char s[] = "-abc-=-def";
312 x = strtok_r(s, "-", &sp); // x = "abc", sp = "=-def"
313 x = strtok_r(NULL, "-=", &sp); // x = "def", sp = NULL
314 x = strtok_r(NULL, "=", &sp); // x = NULL
317 This is a variant of strtok() that is multithread-safe.
319 For the POSIX documentation for this function, see:
320 http://www.opengroup.org/susv3xsh/strtok.html
322 Caveat: It modifies the original string.
323 Caveat: These functions cannot be used on constant strings.
324 Caveat: The identity of the delimiting character is lost.
325 Caveat: It doesn't work with multibyte strings unless all of the delimiter
326 characters are ASCII characters < 0x30.
328 See also strsep(). */
329 #if @GNULIB_STRTOK_R@
330 # if ! @HAVE_DECL_STRTOK_R@
331 extern char *strtok_r (char *restrict s, char const *restrict delim,
332 char **restrict save_ptr);
334 # if defined GNULIB_POSIXCHECK
336 # define strtok_r(s,d,p) \
337 (GL_LINK_WARNING ("strtok_r cannot work correctly on character strings " \
338 "in multibyte locales - " \
339 "use mbstok_r if you care about internationalization"), \
342 #elif defined GNULIB_POSIXCHECK
344 # define strtok_r(s,d,p) \
345 (GL_LINK_WARNING ("strtok_r is unportable - " \
346 "use gnulib module strtok_r for portability"), \
351 /* The following functions are not specified by POSIX. They are gnulib
355 /* Return the number of multibyte characters in the character string STRING.
356 This considers multibyte characters, unlike strlen, which counts bytes. */
357 extern size_t mbslen (const char *string);
361 /* Return the number of multibyte characters in the character string starting
362 at STRING and ending at STRING + LEN. */
363 extern size_t mbsnlen (const char *string, size_t len);
367 /* Locate the first single-byte character C in the character string STRING,
368 and return a pointer to it. Return NULL if C is not found in STRING.
369 Unlike strchr(), this function works correctly in multibyte locales with
370 encodings such as GB18030. */
371 # define mbschr rpl_mbschr /* avoid collision with HP-UX function */
372 extern char * mbschr (const char *string, int c);
376 /* Locate the last single-byte character C in the character string STRING,
377 and return a pointer to it. Return NULL if C is not found in STRING.
378 Unlike strrchr(), this function works correctly in multibyte locales with
379 encodings such as GB18030. */
380 # define mbsrchr rpl_mbsrchr /* avoid collision with HP-UX function */
381 extern char * mbsrchr (const char *string, int c);
385 /* Find the first occurrence of the character string NEEDLE in the character
386 string HAYSTACK. Return NULL if NEEDLE is not found in HAYSTACK.
387 Unlike strstr(), this function works correctly in multibyte locales with
388 encodings different from UTF-8. */
389 extern char * mbsstr (const char *haystack, const char *needle);
392 #if @GNULIB_MBSCASECMP@
393 /* Compare the character strings S1 and S2, ignoring case, returning less than,
394 equal to or greater than zero if S1 is lexicographically less than, equal to
396 Note: This function may, in multibyte locales, return 0 for strings of
398 Unlike strcasecmp(), this function works correctly in multibyte locales. */
399 extern int mbscasecmp (const char *s1, const char *s2);
402 #if @GNULIB_MBSNCASECMP@
403 /* Compare the initial segment of the character string S1 consisting of at most
404 N characters with the initial segment of the character string S2 consisting
405 of at most N characters, ignoring case, returning less than, equal to or
406 greater than zero if the initial segment of S1 is lexicographically less
407 than, equal to or greater than the initial segment of S2.
408 Note: This function may, in multibyte locales, return 0 for initial segments
409 of different lengths!
410 Unlike strncasecmp(), this function works correctly in multibyte locales.
411 But beware that N is not a byte count but a character count! */
412 extern int mbsncasecmp (const char *s1, const char *s2, size_t n);
415 #if @GNULIB_MBSPCASECMP@
416 /* Compare the initial segment of the character string STRING consisting of
417 at most mbslen (PREFIX) characters with the character string PREFIX,
418 ignoring case, returning less than, equal to or greater than zero if this
419 initial segment is lexicographically less than, equal to or greater than
421 Note: This function may, in multibyte locales, return 0 if STRING is of
422 smaller length than PREFIX!
423 Unlike strncasecmp(), this function works correctly in multibyte
425 extern char * mbspcasecmp (const char *string, const char *prefix);
428 #if @GNULIB_MBSCASESTR@
429 /* Find the first occurrence of the character string NEEDLE in the character
430 string HAYSTACK, using case-insensitive comparison.
431 Note: This function may, in multibyte locales, return success even if
432 strlen (haystack) < strlen (needle) !
433 Unlike strcasestr(), this function works correctly in multibyte locales. */
434 extern char * mbscasestr (const char *haystack, const char *needle);
438 /* Find the first occurrence in the character string STRING of any character
439 in the character string ACCEPT. Return the number of bytes from the
440 beginning of the string to this occurrence, or to the end of the string
442 Unlike strcspn(), this function works correctly in multibyte locales. */
443 extern size_t mbscspn (const char *string, const char *accept);
447 /* Find the first occurrence in the character string STRING of any character
448 in the character string ACCEPT. Return the pointer to it, or NULL if none
450 Unlike strpbrk(), this function works correctly in multibyte locales. */
451 # define mbspbrk rpl_mbspbrk /* avoid collision with HP-UX function */
452 extern char * mbspbrk (const char *string, const char *accept);
456 /* Find the first occurrence in the character string STRING of any character
457 not in the character string REJECT. Return the number of bytes from the
458 beginning of the string to this occurrence, or to the end of the string
460 Unlike strspn(), this function works correctly in multibyte locales. */
461 extern size_t mbsspn (const char *string, const char *reject);
465 /* Search the next delimiter (multibyte character listed in the character
466 string DELIM) starting at the character string *STRINGP.
467 If one is found, overwrite it with a NUL, and advance *STRINGP to point
468 to the next multibyte character after it. Otherwise, set *STRINGP to NULL.
469 If *STRINGP was already NULL, nothing happens.
470 Return the old value of *STRINGP.
472 This is a variant of mbstok_r() that supports empty fields.
474 Caveat: It modifies the original string.
475 Caveat: These functions cannot be used on constant strings.
476 Caveat: The identity of the delimiting character is lost.
478 See also mbstok_r(). */
479 extern char * mbssep (char **stringp, const char *delim);
482 #if @GNULIB_MBSTOK_R@
483 /* Parse the character string STRING into tokens separated by characters in
484 the character string DELIM.
485 If STRING is NULL, the saved pointer in SAVE_PTR is used as
486 the next starting point. For example:
487 char s[] = "-abc-=-def";
489 x = mbstok_r(s, "-", &sp); // x = "abc", sp = "=-def"
490 x = mbstok_r(NULL, "-=", &sp); // x = "def", sp = NULL
491 x = mbstok_r(NULL, "=", &sp); // x = NULL
494 Caveat: It modifies the original string.
495 Caveat: These functions cannot be used on constant strings.
496 Caveat: The identity of the delimiting character is lost.
498 See also mbssep(). */
499 extern char * mbstok_r (char *string, const char *delim, char **save_ptr);
502 /* Map any int, typically from errno, into an error message. */
503 #if @GNULIB_STRERROR@
504 # if @REPLACE_STRERROR@
506 # define strerror rpl_strerror
507 extern char *strerror (int);
509 #elif defined GNULIB_POSIXCHECK
511 # define strerror(e) \
512 (GL_LINK_WARNING ("strerror is unportable - " \
513 "use gnulib module strerror to guarantee non-NULL result"), \
522 #endif /* _GL_STRING_H */
523 #endif /* _GL_STRING_H */