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 /* Copy N bytes of SRC to DEST, guaranteeing
42 correct behavior for overlapping strings. */
43 extern void *memmove (void *__dest
, __const
void *__src
, size_t __n
)
44 __THROW
__nonnull ((1, 2));
47 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
48 Return the position in DEST one byte past where C was copied,
49 or NULL if C was not found in the first N bytes of SRC. */
50 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN
51 extern void *memccpy (void *__restrict __dest
, __const
void *__restrict __src
,
53 __THROW
__nonnull ((1, 2));
58 /* Set N bytes of S to C. */
59 extern void *memset (void *__s
, int __c
, size_t __n
) __THROW
__nonnull ((1));
61 /* Compare N bytes of S1 and S2. */
62 extern int memcmp (__const
void *__s1
, __const
void *__s2
, size_t __n
)
63 __THROW __attribute_pure__
__nonnull ((1, 2));
65 /* Search N bytes of S for C. */
66 extern void *memchr (__const
void *__s
, int __c
, size_t __n
)
67 __THROW __attribute_pure__
__nonnull ((1));
71 /* Search in S for C. This is similar to `memchr' but there is no
73 extern void *rawmemchr (__const
void *__s
, int __c
)
74 __THROW __attribute_pure__
__nonnull ((1));
76 /* Search N bytes of S for the final occurrence of C. */
77 extern void *memrchr (__const
void *__s
, int __c
, size_t __n
)
78 __THROW __attribute_pure__
__nonnull ((1));
83 /* Copy SRC to DEST. */
84 extern char *strcpy (char *__restrict __dest
, __const
char *__restrict __src
)
85 __THROW
__nonnull ((1, 2));
86 /* Copy no more than N characters of SRC to DEST. */
87 extern char *strncpy (char *__restrict __dest
,
88 __const
char *__restrict __src
, size_t __n
)
89 __THROW
__nonnull ((1, 2));
91 /* Append SRC onto DEST. */
92 extern char *strcat (char *__restrict __dest
, __const
char *__restrict __src
)
93 __THROW
__nonnull ((1, 2));
94 /* Append no more than N characters from SRC onto DEST. */
95 extern char *strncat (char *__restrict __dest
, __const
char *__restrict __src
,
96 size_t __n
) __THROW
__nonnull ((1, 2));
98 /* Compare S1 and S2. */
99 extern int strcmp (__const
char *__s1
, __const
char *__s2
)
100 __THROW __attribute_pure__
__nonnull ((1, 2));
101 /* Compare N characters of S1 and S2. */
102 extern int strncmp (__const
char *__s1
, __const
char *__s2
, size_t __n
)
103 __THROW __attribute_pure__
__nonnull ((1, 2));
105 /* Compare the collated forms of S1 and S2. */
106 extern int strcoll (__const
char *__s1
, __const
char *__s2
)
107 __THROW __attribute_pure__
__nonnull ((1, 2));
108 /* Put a transformation of SRC into no more than N bytes of DEST. */
109 extern size_t strxfrm (char *__restrict __dest
,
110 __const
char *__restrict __src
, size_t __n
)
111 __THROW
__nonnull ((2));
114 #if defined __USE_GNU && defined __UCLIBC_HAS_XLOCALE__
115 /* The following functions are equivalent to the both above but they
116 take the locale they use for the collation as an extra argument.
117 This is not standardsized but something like will come. */
118 # include <xlocale.h>
120 /* Compare the collated forms of S1 and S2 using rules from L. */
121 extern int strcoll_l (__const
char *__s1
, __const
char *__s2
, __locale_t __l
)
122 __THROW __attribute_pure__
__nonnull ((1, 2, 3));
123 /* Put a transformation of SRC into no more than N bytes of DEST. */
124 extern size_t strxfrm_l (char *__dest
, __const
char *__src
, size_t __n
,
125 __locale_t __l
) __THROW
__nonnull ((2, 4));
128 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
129 /* Duplicate S, returning an identical malloc'd string. */
130 extern char *strdup (__const
char *__s
)
131 __THROW __attribute_malloc__
__nonnull ((1));
134 /* Return a malloc'd copy of at most N bytes of STRING. The
135 resultant string is terminated even if no null terminator
136 appears before STRING[N]. */
137 #if defined __USE_GNU
138 extern char *strndup (__const
char *__string
, size_t __n
)
139 __THROW __attribute_malloc__
__nonnull ((1));
142 #if defined __USE_GNU && defined __GNUC__
143 /* Duplicate S, returning an identical alloca'd string. */
144 # define strdupa(s) \
147 __const char *__old = (s); \
148 size_t __len = strlen (__old) + 1; \
149 char *__new = (char *) __builtin_alloca (__len); \
150 (char *) memcpy (__new, __old, __len); \
153 /* Return an alloca'd copy of at most N bytes of string. */
154 # define strndupa(s, n) \
157 __const char *__old = (s); \
158 size_t __len = strnlen (__old, (n)); \
159 char *__new = (char *) __builtin_alloca (__len + 1); \
160 __new[__len] = '\0'; \
161 (char *) memcpy (__new, __old, __len); \
165 __BEGIN_NAMESPACE_STD
166 /* Find the first occurrence of C in S. */
167 extern char *strchr (__const
char *__s
, int __c
)
168 __THROW __attribute_pure__
__nonnull ((1));
169 /* Find the last occurrence of C in S. */
170 extern char *strrchr (__const
char *__s
, int __c
)
171 __THROW __attribute_pure__
__nonnull ((1));
175 /* This function is similar to `strchr'. But it returns a pointer to
176 the closing NUL byte in case C is not found in S. */
177 extern char *strchrnul (__const
char *__s
, int __c
)
178 __THROW __attribute_pure__
__nonnull ((1));
181 __BEGIN_NAMESPACE_STD
182 /* Return the length of the initial segment of S which
183 consists entirely of characters not in REJECT. */
184 extern size_t strcspn (__const
char *__s
, __const
char *__reject
)
185 __THROW __attribute_pure__
__nonnull ((1, 2));
186 /* Return the length of the initial segment of S which
187 consists entirely of characters in ACCEPT. */
188 extern size_t strspn (__const
char *__s
, __const
char *__accept
)
189 __THROW __attribute_pure__
__nonnull ((1, 2));
190 /* Find the first occurrence in S of any character in ACCEPT. */
191 extern char *strpbrk (__const
char *__s
, __const
char *__accept
)
192 __THROW __attribute_pure__
__nonnull ((1, 2));
193 /* Find the first occurrence of NEEDLE in HAYSTACK. */
194 extern char *strstr (__const
char *__haystack
, __const
char *__needle
)
195 __THROW __attribute_pure__
__nonnull ((1, 2));
198 /* Divide S into tokens separated by characters in DELIM. */
199 extern char *strtok (char *__restrict __s
, __const
char *__restrict __delim
)
200 __THROW
__nonnull ((2));
203 /* Divide S into tokens separated by characters in DELIM. Information
204 passed between calls are stored in SAVE_PTR. */
205 #if 0 /* uClibc: disabled */
206 extern char *__strtok_r (char *__restrict __s
,
207 __const
char *__restrict __delim
,
208 char **__restrict __save_ptr
)
209 __THROW
__nonnull ((2, 3));
211 #if defined __USE_POSIX || defined __USE_MISC
212 extern char *strtok_r (char *__restrict __s
, __const
char *__restrict __delim
,
213 char **__restrict __save_ptr
)
214 __THROW
__nonnull ((2, 3));
218 /* Similar to `strstr' but this function ignores the case of both strings. */
219 extern char *strcasestr (__const
char *__haystack
, __const
char *__needle
)
220 __THROW __attribute_pure__
__nonnull ((1, 2));
224 /* Find the first occurrence of NEEDLE in HAYSTACK.
225 NEEDLE is NEEDLELEN bytes long;
226 HAYSTACK is HAYSTACKLEN bytes long. */
227 extern void *memmem (__const
void *__haystack
, size_t __haystacklen
,
228 __const
void *__needle
, size_t __needlelen
)
229 __THROW __attribute_pure__
__nonnull ((1, 3));
231 /* Copy N bytes of SRC to DEST, return pointer to bytes after the
232 last written byte. */
233 #if __GNUC_PREREQ (3, 4)
234 # define __mempcpy(dest, src, n) __builtin_mempcpy(dest, src, n)
235 #else /* uClibc: disabled */
236 extern void *__mempcpy (void *__restrict __dest
,
237 __const
void *__restrict __src
, size_t __n
)
238 __THROW
__nonnull ((1, 2));
240 extern void *mempcpy (void *__restrict __dest
,
241 __const
void *__restrict __src
, size_t __n
)
242 __THROW
__nonnull ((1, 2));
246 __BEGIN_NAMESPACE_STD
247 /* Return the length of S. */
248 extern size_t strlen (__const
char *__s
)
249 __THROW __attribute_pure__
__nonnull ((1));
253 /* Find the length of STRING, but scan at most MAXLEN characters.
254 If no '\0' terminator is found in that many characters, return MAXLEN. */
255 extern size_t strnlen (__const
char *__string
, size_t __maxlen
)
256 __THROW __attribute_pure__
__nonnull ((1));
260 __BEGIN_NAMESPACE_STD
261 /* Return a string describing the meaning of the `errno' code in ERRNUM. */
262 extern char *strerror (int __errnum
) __THROW
;
264 #if defined __USE_XOPEN2K || defined __USE_MISC
265 /* Reentrant version of `strerror'.
266 There are 2 flavors of `strerror_r', GNU which returns the string
267 and may or may not use the supplied temporary buffer and POSIX one
268 which fills the string into the buffer.
269 To use the POSIX version, -D_XOPEN_SOURCE=600 or -D_POSIX_C_SOURCE=200112L
270 without -D_GNU_SOURCE is needed, otherwise the GNU version is
272 # if defined __USE_XOPEN2K && !defined __USE_GNU
273 /* Fill BUF with a string describing the meaning of the `errno' code in
275 extern int __xpg_strerror_r (int __errnum
, char *__buf
, size_t __buflen
)
276 __THROW
__nonnull ((2));
277 # ifdef __REDIRECT_NTH
278 extern int __REDIRECT_NTH (strerror_r
,
279 (int __errnum
, char *__buf
, size_t __buflen
),
280 __xpg_strerror_r
) __nonnull ((2));
282 # define strerror_r __xpg_strerror_r
285 /* If a temporary buffer is required, at most BUFLEN bytes of BUF will be
287 extern char *__glibc_strerror_r (int __errnum
, char *__buf
, size_t __buflen
)
288 __THROW
__nonnull ((2));
289 # ifdef __REDIRECT_NTH
290 extern char * __REDIRECT_NTH (strerror_r
,
291 (int __errnum
, char *__buf
, size_t __buflen
),
292 __glibc_strerror_r
) __nonnull ((2));
294 # define strerror_r __glibc_strerror_r
299 /* We define this function always since `bzero' is sometimes needed when
300 the namespace rules does not allow this. */
301 #if 0 /* uClibc: disabled */
302 extern void __bzero (void *__s
, size_t __n
) __THROW
__nonnull ((1));
306 # ifdef __UCLIBC_SUSV3_LEGACY__
307 /* Copy N bytes of SRC to DEST (like memmove, but args reversed). */
308 extern void bcopy (__const
void *__src
, void *__dest
, size_t __n
)
309 __THROW
__nonnull ((1, 2));
311 /* Set N bytes of S to 0. */
312 extern void bzero (void *__s
, size_t __n
) __THROW
__nonnull ((1));
314 /* Compare N bytes of S1 and S2 (same as memcmp). */
315 extern int bcmp (__const
void *__s1
, __const
void *__s2
, size_t __n
)
316 __THROW __attribute_pure__
__nonnull ((1, 2));
318 /* Find the first occurrence of C in S (same as strchr). */
319 extern char *index (__const
char *__s
, int __c
)
320 __THROW __attribute_pure__
__nonnull ((1));
322 /* Find the last occurrence of C in S (same as strrchr). */
323 extern char *rindex (__const
char *__s
, int __c
)
324 __THROW __attribute_pure__
__nonnull ((1));
325 # elif defined(__UCLIBC_SUSV3_LEGACY_MACROS__) && !defined(_STRINGS_H)
326 /* bcopy/bzero/bcmp/index/rindex are marked LEGACY in SuSv3.
327 * They are replaced as proposed by SuSv3. Don't sync this part
328 * with glibc and keep it in sync with strings.h. */
330 /* Copy N bytes of SRC to DEST (like memmove, but args reversed). */
331 static __inline__
void bcopy (__const
void *__src
, void *__dest
, size_t __n
)
333 memmove(__dest
, __src
, __n
);
336 /* Set N bytes of S to 0. */
337 static __inline__
void bzero (void *__s
, size_t __n
)
342 /* Compare N bytes of S1 and S2 (same as memcmp). */
343 static __inline__
int bcmp (__const
void *__s1
, __const
void *__s2
, size_t __n
)
345 return memcmp(__s1
, __s2
, __n
);
348 /* Find the first occurrence of C in S (same as strchr). */
349 static __inline__
char *index (__const
char *__s
, int __c
)
351 return strchr(__s
, __c
);
354 /* Find the last occurrence of C in S (same as strrchr). */
355 static __inline__
char *rindex (__const
char *__s
, int __c
)
357 return strrchr(__s
, __c
);
361 /* Return the position of the first bit set in I, or 0 if none are set.
362 The least-significant bit is position 1, the most-significant 32. */
363 extern int ffs (int __i
) __THROW
__attribute__ ((__const__
));
365 /* The following two functions are non-standard but necessary for non-32 bit
367 #if 0 /*def __USE_GNU*/
368 extern int ffsl (long int __l
) __THROW
__attribute__ ((__const__
));
370 __extension__
extern int ffsll (long long int __ll
)
371 __THROW
__attribute__ ((__const__
));
375 /* Compare S1 and S2, ignoring case. */
376 extern int strcasecmp (__const
char *__s1
, __const
char *__s2
)
377 __THROW __attribute_pure__
__nonnull ((1, 2));
379 /* Compare no more than N chars of S1 and S2, ignoring case. */
380 extern int strncasecmp (__const
char *__s1
, __const
char *__s2
, size_t __n
)
381 __THROW __attribute_pure__
__nonnull ((1, 2));
382 #endif /* Use BSD. */
384 #if defined __USE_GNU && defined __UCLIBC_HAS_XLOCALE__
385 /* Again versions of a few functions which use the given locale instead
386 of the global one. */
387 extern int strcasecmp_l (__const
char *__s1
, __const
char *__s2
,
389 __THROW __attribute_pure__
__nonnull ((1, 2, 3));
391 extern int strncasecmp_l (__const
char *__s1
, __const
char *__s2
,
392 size_t __n
, __locale_t __loc
)
393 __THROW __attribute_pure__
__nonnull ((1, 2, 4));
397 /* Return the next DELIM-delimited token from *STRINGP,
398 terminating it with a '\0', and update *STRINGP to point past it. */
399 extern char *strsep (char **__restrict __stringp
,
400 __const
char *__restrict __delim
)
401 __THROW
__nonnull ((1, 2));
405 /* Compare S1 and S2 as strings holding name & indices/version numbers. */
406 extern int strverscmp (__const
char *__s1
, __const
char *__s2
)
407 __THROW __attribute_pure__
__nonnull ((1, 2));
409 /* Return a string describing the meaning of the signal number in SIG. */
410 extern char *strsignal (int __sig
) __THROW
;
412 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST. */
413 #if 0 /* uClibc: disabled */
414 extern char *__stpcpy (char *__restrict __dest
, __const
char *__restrict __src
)
415 __THROW
__nonnull ((1, 2));
417 extern char *stpcpy (char *__restrict __dest
, __const
char *__restrict __src
)
418 __THROW
__nonnull ((1, 2));
420 /* Copy no more than N characters of SRC to DEST, returning the address of
421 the last character written into DEST. */
422 #if 0 /* uClibc: disabled */
423 extern char *__stpncpy (char *__restrict __dest
,
424 __const
char *__restrict __src
, size_t __n
)
425 __THROW
__nonnull ((1, 2));
427 extern char *stpncpy (char *__restrict __dest
,
428 __const
char *__restrict __src
, size_t __n
)
429 __THROW
__nonnull ((1, 2));
431 #if 0 /* uClibc does not support strfry or memfrob. */
432 /* Sautee STRING briskly. */
433 extern char *strfry (char *__string
) __THROW
__nonnull ((1));
435 /* Frobnicate N bytes of S. */
436 extern void *memfrob (void *__s
, size_t __n
) __THROW
__nonnull ((1));
440 /* Return the file name within directory of FILENAME. We don't
441 declare the function if the `basename' macro is available (defined
442 in <libgen.h>) which makes the XPG version of this function
444 extern char *basename (__const
char *__filename
) __THROW
__nonnull ((1));
450 /* Two OpenBSD extension functions. */
451 extern size_t strlcat(char *__restrict dst
, const char *__restrict src
,
452 size_t n
) __THROW
__nonnull ((1, 2));
453 extern size_t strlcpy(char *__restrict dst
, const char *__restrict src
,
454 size_t n
) __THROW
__nonnull ((1, 2));
459 #endif /* string.h */