1 /* Copyright (C) 1991-1993, 1995-2003, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library 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 GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 * ISO C99 Standard: 7.21 String handling <string.h>
30 /* Get size_t and NULL from <stddef.h>. */
37 /* Copy N bytes of SRC to DEST. */
38 extern void *memcpy (void *__restrict __dest,
39 __const void *__restrict __src, size_t __n)
40 __THROW __nonnull ((1, 2));
41 libc_hidden_proto(memcpy)
42 /* Copy N bytes of SRC to DEST, guaranteeing
43 correct behavior for overlapping strings. */
44 extern void *memmove (void *__dest, __const void *__src, size_t __n)
45 __THROW __nonnull ((1, 2));
46 libc_hidden_proto(memmove)
49 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
50 Return the position in DEST one byte past where C was copied,
51 or NULL if C was not found in the first N bytes of SRC. */
52 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN
53 extern void *memccpy (void *__restrict __dest, __const void *__restrict __src,
55 __THROW __nonnull ((1, 2));
56 libc_hidden_proto(memccpy)
61 /* Set N bytes of S to C. */
62 extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
63 libc_hidden_proto(memset)
65 /* Compare N bytes of S1 and S2. */
66 extern int memcmp (__const void *__s1, __const void *__s2, size_t __n)
67 __THROW __attribute_pure__ __nonnull ((1, 2));
68 libc_hidden_proto(memcmp)
70 /* Search N bytes of S for C. */
71 extern void *memchr (__const void *__s, int __c, size_t __n)
72 __THROW __attribute_pure__ __nonnull ((1));
73 libc_hidden_proto(memchr)
77 /* Search in S for C. This is similar to `memchr' but there is no
79 extern void *rawmemchr (__const void *__s, int __c)
80 __THROW __attribute_pure__ __nonnull ((1));
81 libc_hidden_proto(rawmemchr)
83 /* Search N bytes of S for the final occurrence of C. */
84 extern void *memrchr (__const void *__s, int __c, size_t __n)
85 __THROW __attribute_pure__ __nonnull ((1));
86 libc_hidden_proto(memrchr)
91 /* Copy SRC to DEST. */
92 extern char *strcpy (char *__restrict __dest, __const char *__restrict __src)
93 __THROW __nonnull ((1, 2));
94 libc_hidden_proto(strcpy)
95 /* Copy no more than N characters of SRC to DEST. */
96 extern char *strncpy (char *__restrict __dest,
97 __const char *__restrict __src, size_t __n)
98 __THROW __nonnull ((1, 2));
99 libc_hidden_proto(strncpy)
101 /* Append SRC onto DEST. */
102 extern char *strcat (char *__restrict __dest, __const char *__restrict __src)
103 __THROW __nonnull ((1, 2));
104 libc_hidden_proto(strcat)
105 /* Append no more than N characters from SRC onto DEST. */
106 extern char *strncat (char *__restrict __dest, __const char *__restrict __src,
107 size_t __n) __THROW __nonnull ((1, 2));
108 libc_hidden_proto(strncat)
110 /* Compare S1 and S2. */
111 extern int strcmp (__const char *__s1, __const char *__s2)
112 __THROW __attribute_pure__ __nonnull ((1, 2));
113 libc_hidden_proto(strcmp)
114 /* Compare N characters of S1 and S2. */
115 extern int strncmp (__const char *__s1, __const char *__s2, size_t __n)
116 __THROW __attribute_pure__ __nonnull ((1, 2));
117 libc_hidden_proto(strncmp)
119 /* Compare the collated forms of S1 and S2. */
120 extern int strcoll (__const char *__s1, __const char *__s2)
121 __THROW __attribute_pure__ __nonnull ((1, 2));
122 libc_hidden_proto(strcoll)
123 /* Put a transformation of SRC into no more than N bytes of DEST. */
124 extern size_t strxfrm (char *__restrict __dest,
125 __const char *__restrict __src, size_t __n)
126 __THROW __nonnull ((2));
129 #if defined __USE_GNU && defined __UCLIBC_HAS_XLOCALE__
130 /* The following functions are equivalent to the both above but they
131 take the locale they use for the collation as an extra argument.
132 This is not standardsized but something like will come. */
133 # include <xlocale.h>
135 /* Compare the collated forms of S1 and S2 using rules from L. */
136 extern int strcoll_l (__const char *__s1, __const char *__s2, __locale_t __l)
137 __THROW __attribute_pure__ __nonnull ((1, 2, 3));
138 libc_hidden_proto(strcoll_l)
139 /* Put a transformation of SRC into no more than N bytes of DEST. */
140 extern size_t strxfrm_l (char *__dest, __const char *__src, size_t __n,
141 __locale_t __l) __THROW __nonnull ((2, 4));
142 libc_hidden_proto(strxfrm_l)
145 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
146 /* Duplicate S, returning an identical malloc'd string. */
147 extern char *strdup (__const char *__s)
148 __THROW __attribute_malloc__ __nonnull ((1));
149 libc_hidden_proto(strdup)
152 /* Return a malloc'd copy of at most N bytes of STRING. The
153 resultant string is terminated even if no null terminator
154 appears before STRING[N]. */
155 #if defined __USE_GNU
156 extern char *strndup (__const char *__string, size_t __n)
157 __THROW __attribute_malloc__ __nonnull ((1));
158 libc_hidden_proto(strndup)
161 #if defined __USE_GNU && defined __GNUC__
162 /* Duplicate S, returning an identical alloca'd string. */
163 # define strdupa(s) \
166 __const char *__old = (s); \
167 size_t __len = strlen (__old) + 1; \
168 char *__new = (char *) __builtin_alloca (__len); \
169 (char *) memcpy (__new, __old, __len); \
172 /* Return an alloca'd copy of at most N bytes of string. */
173 # define strndupa(s, n) \
176 __const char *__old = (s); \
177 size_t __len = strnlen (__old, (n)); \
178 char *__new = (char *) __builtin_alloca (__len + 1); \
179 __new[__len] = '\0'; \
180 (char *) memcpy (__new, __old, __len); \
184 __BEGIN_NAMESPACE_STD
185 /* Find the first occurrence of C in S. */
186 extern char *strchr (__const char *__s, int __c)
187 __THROW __attribute_pure__ __nonnull ((1));
188 libc_hidden_proto(strchr)
189 /* Find the last occurrence of C in S. */
190 extern char *strrchr (__const char *__s, int __c)
191 __THROW __attribute_pure__ __nonnull ((1));
192 libc_hidden_proto(strrchr)
196 /* This function is similar to `strchr'. But it returns a pointer to
197 the closing NUL byte in case C is not found in S. */
198 extern char *strchrnul (__const char *__s, int __c)
199 __THROW __attribute_pure__ __nonnull ((1));
200 libc_hidden_proto(strchrnul)
203 __BEGIN_NAMESPACE_STD
204 /* Return the length of the initial segment of S which
205 consists entirely of characters not in REJECT. */
206 extern size_t strcspn (__const char *__s, __const char *__reject)
207 __THROW __attribute_pure__ __nonnull ((1, 2));
208 libc_hidden_proto(strcspn)
209 /* Return the length of the initial segment of S which
210 consists entirely of characters in ACCEPT. */
211 extern size_t strspn (__const char *__s, __const char *__accept)
212 __THROW __attribute_pure__ __nonnull ((1, 2));
213 libc_hidden_proto(strspn)
214 /* Find the first occurrence in S of any character in ACCEPT. */
215 extern char *strpbrk (__const char *__s, __const char *__accept)
216 __THROW __attribute_pure__ __nonnull ((1, 2));
217 libc_hidden_proto(strpbrk)
218 /* Find the first occurrence of NEEDLE in HAYSTACK. */
219 extern char *strstr (__const char *__haystack, __const char *__needle)
220 __THROW __attribute_pure__ __nonnull ((1, 2));
221 libc_hidden_proto(strstr)
224 /* Divide S into tokens separated by characters in DELIM. */
225 extern char *strtok (char *__restrict __s, __const char *__restrict __delim)
226 __THROW __nonnull ((2));
227 libc_hidden_proto(strtok)
230 /* Divide S into tokens separated by characters in DELIM. Information
231 passed between calls are stored in SAVE_PTR. */
232 #if 0 /* uClibc: disabled */
233 extern char *__strtok_r (char *__restrict __s,
234 __const char *__restrict __delim,
235 char **__restrict __save_ptr)
236 __THROW __nonnull ((2, 3));
238 #if defined __USE_POSIX || defined __USE_MISC
239 extern char *strtok_r (char *__restrict __s, __const char *__restrict __delim,
240 char **__restrict __save_ptr)
241 __THROW __nonnull ((2, 3));
242 libc_hidden_proto(strtok_r)
246 /* Similar to `strstr' but this function ignores the case of both strings. */
247 extern char *strcasestr (__const char *__haystack, __const char *__needle)
248 __THROW __attribute_pure__ __nonnull ((1, 2));
249 libc_hidden_proto(strcasestr)
253 /* Find the first occurrence of NEEDLE in HAYSTACK.
254 NEEDLE is NEEDLELEN bytes long;
255 HAYSTACK is HAYSTACKLEN bytes long. */
256 extern void *memmem (__const void *__haystack, size_t __haystacklen,
257 __const void *__needle, size_t __needlelen)
258 __THROW __attribute_pure__ __nonnull ((1, 3));
260 /* Copy N bytes of SRC to DEST, return pointer to bytes after the
261 last written byte. */
262 #if 0 /* uClibc: disabled */
263 extern void *__mempcpy (void *__restrict __dest,
264 __const void *__restrict __src, size_t __n)
265 __THROW __nonnull ((1, 2));
267 extern void *mempcpy (void *__restrict __dest,
268 __const void *__restrict __src, size_t __n)
269 __THROW __nonnull ((1, 2));
270 libc_hidden_proto(mempcpy)
274 __BEGIN_NAMESPACE_STD
275 /* Return the length of S. */
276 extern size_t strlen (__const char *__s)
277 __THROW __attribute_pure__ __nonnull ((1));
278 libc_hidden_proto(strlen)
282 /* Find the length of STRING, but scan at most MAXLEN characters.
283 If no '\0' terminator is found in that many characters, return MAXLEN. */
284 extern size_t strnlen (__const char *__string, size_t __maxlen)
285 __THROW __attribute_pure__ __nonnull ((1));
286 libc_hidden_proto(strnlen)
290 __BEGIN_NAMESPACE_STD
291 /* Return a string describing the meaning of the `errno' code in ERRNUM. */
292 extern char *strerror (int __errnum) __THROW;
293 libc_hidden_proto(strerror)
295 #if defined __USE_XOPEN2K || defined __USE_MISC
296 /* Reentrant version of `strerror'.
297 There are 2 flavors of `strerror_r', GNU which returns the string
298 and may or may not use the supplied temporary buffer and POSIX one
299 which fills the string into the buffer.
300 To use the POSIX version, -D_XOPEN_SOURCE=600 or -D_POSIX_C_SOURCE=200112L
301 without -D_GNU_SOURCE is needed, otherwise the GNU version is
303 # if defined __USE_XOPEN2K && !defined __USE_GNU
304 /* Fill BUF with a string describing the meaning of the `errno' code in
306 extern int __xpg_strerror_r (int __errnum, char *__buf, size_t __buflen)
307 __THROW __nonnull ((2));
308 libc_hidden_proto(__xpg_strerror_r)
309 # ifdef __REDIRECT_NTH
310 extern int __REDIRECT_NTH (strerror_r,
311 (int __errnum, char *__buf, size_t __buflen),
312 __xpg_strerror_r) __nonnull ((2));
314 # define strerror_r __xpg_strerror_r
317 /* If a temporary buffer is required, at most BUFLEN bytes of BUF will be
319 extern char *__glibc_strerror_r (int __errnum, char *__buf, size_t __buflen)
320 __THROW __nonnull ((2));
321 libc_hidden_proto(__glibc_strerror_r)
322 # ifdef __REDIRECT_NTH
323 extern char * __REDIRECT_NTH (strerror_r,
324 (int __errnum, char *__buf, size_t __buflen),
325 __glibc_strerror_r) __nonnull ((2));
327 # define strerror_r __glibc_strerror_r
332 /* We define this function always since `bzero' is sometimes needed when
333 the namespace rules does not allow this. */
334 #if 0 /* uClibc: disabled */
335 extern void __bzero (void *__s, size_t __n) __THROW __nonnull ((1));
339 # ifdef __UCLIBC_SUSV3_LEGACY__
340 /* Copy N bytes of SRC to DEST (like memmove, but args reversed). */
341 extern void bcopy (__const void *__src, void *__dest, size_t __n)
342 __THROW __nonnull ((1, 2));
344 /* Set N bytes of S to 0. */
345 extern void bzero (void *__s, size_t __n) __THROW __nonnull ((1));
347 /* Compare N bytes of S1 and S2 (same as memcmp). */
348 extern int bcmp (__const void *__s1, __const void *__s2, size_t __n)
349 __THROW __attribute_pure__ __nonnull ((1, 2));
351 /* Find the first occurrence of C in S (same as strchr). */
352 extern char *index (__const char *__s, int __c)
353 __THROW __attribute_pure__ __nonnull ((1));
355 /* Find the last occurrence of C in S (same as strrchr). */
356 extern char *rindex (__const char *__s, int __c)
357 __THROW __attribute_pure__ __nonnull ((1));
359 # ifdef __UCLIBC_SUSV3_LEGACY_MACROS__
360 /* bcopy/bzero/bcmp/index/rindex are marked LEGACY in SuSv3.
361 * They are replaced as proposed by SuSv3. Don't sync this part
362 * with glibc and keep it in sync with strings.h. */
364 # define bcopy(src,dest,n) (memmove((dest), (src), (n)), (void) 0)
365 # define bzero(s,n) (memset((s), '\0', (n)), (void) 0)
366 # define bcmp(s1,s2,n) memcmp((s1), (s2), (size_t)(n))
367 # define index(s,c) strchr((s), (c))
368 # define rindex(s,c) strrchr((s), (c))
372 /* Return the position of the first bit set in I, or 0 if none are set.
373 The least-significant bit is position 1, the most-significant 32. */
374 extern int ffs (int __i) __THROW __attribute__ ((__const__));
375 libc_hidden_proto(ffs)
377 /* The following two functions are non-standard but necessary for non-32 bit
380 extern int ffsl (long int __l) __THROW __attribute__ ((__const__));
382 __extension__ extern int ffsll (long long int __ll)
383 __THROW __attribute__ ((__const__));
387 /* Compare S1 and S2, ignoring case. */
388 extern int strcasecmp (__const char *__s1, __const char *__s2)
389 __THROW __attribute_pure__ __nonnull ((1, 2));
390 libc_hidden_proto(strcasecmp)
392 /* Compare no more than N chars of S1 and S2, ignoring case. */
393 extern int strncasecmp (__const char *__s1, __const char *__s2, size_t __n)
394 __THROW __attribute_pure__ __nonnull ((1, 2));
395 libc_hidden_proto(strncasecmp)
396 #endif /* Use BSD. */
398 #if defined __USE_GNU && defined __UCLIBC_HAS_XLOCALE__
399 /* Again versions of a few functions which use the given locale instead
400 of the global one. */
401 extern int strcasecmp_l (__const char *__s1, __const char *__s2,
403 __THROW __attribute_pure__ __nonnull ((1, 2, 3));
404 libc_hidden_proto(strcasecmp_l)
406 extern int strncasecmp_l (__const char *__s1, __const char *__s2,
407 size_t __n, __locale_t __loc)
408 __THROW __attribute_pure__ __nonnull ((1, 2, 4));
409 libc_hidden_proto(strncasecmp_l)
413 /* Return the next DELIM-delimited token from *STRINGP,
414 terminating it with a '\0', and update *STRINGP to point past it. */
415 extern char *strsep (char **__restrict __stringp,
416 __const char *__restrict __delim)
417 __THROW __nonnull ((1, 2));
418 libc_hidden_proto(strsep)
422 /* Compare S1 and S2 as strings holding name & indices/version numbers. */
423 extern int strverscmp (__const char *__s1, __const char *__s2)
424 __THROW __attribute_pure__ __nonnull ((1, 2));
425 libc_hidden_proto(strverscmp)
427 /* Return a string describing the meaning of the signal number in SIG. */
428 extern char *strsignal (int __sig) __THROW;
429 libc_hidden_proto(strsignal)
431 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST. */
432 # if 0 /* uClibc: disabled */
433 extern char *__stpcpy (char *__restrict __dest, __const char *__restrict __src)
434 __THROW __nonnull ((1, 2));
436 extern char *stpcpy (char *__restrict __dest, __const char *__restrict __src)
437 __THROW __nonnull ((1, 2));
438 libc_hidden_proto(stpcpy)
440 /* Copy no more than N characters of SRC to DEST, returning the address of
441 the last character written into DEST. */
442 # if 0 /* uClibc: disabled */
443 extern char *__stpncpy (char *__restrict __dest,
444 __const char *__restrict __src, size_t __n)
445 __THROW __nonnull ((1, 2));
447 extern char *stpncpy (char *__restrict __dest,
448 __const char *__restrict __src, size_t __n)
449 __THROW __nonnull ((1, 2));
451 # if 0 /* uClibc does not support strfry or memfrob. */
452 /* Sautee STRING briskly. */
453 extern char *strfry (char *__string) __THROW __nonnull ((1));
455 /* Frobnicate N bytes of S. */
456 extern void *memfrob (void *__s, size_t __n) __THROW __nonnull ((1));
460 /* Return the file name within directory of FILENAME. We don't
461 declare the function if the `basename' macro is available (defined
462 in <libgen.h>) which makes the XPG version of this function
464 extern char *basename (__const char *__filename) __THROW __nonnull ((1));
465 libc_hidden_proto(basename)
467 #endif /* __USE_GNU */
471 /* Two OpenBSD extension functions. */
472 extern size_t strlcat(char *__restrict dst, const char *__restrict src,
473 size_t n) __THROW __nonnull ((1, 2));
474 libc_hidden_proto(strlcat)
475 extern size_t strlcpy(char *__restrict dst, const char *__restrict src,
476 size_t n) __THROW __nonnull ((1, 2));
477 libc_hidden_proto(strlcpy)
483 #if defined(_LIBC) && defined(__UCLIBC_HAS_STRING_ARCH_OPT__)
484 # if defined __i386__
485 # include <../libc/string/i386/string.h>
489 #endif /* string.h */