1 /* Copyright (C) 1991,92,93,95,96,97,98,99,2000,2001 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>. */
36 /* Copy N bytes of SRC to DEST. */
37 extern void *memcpy (void *__restrict __dest,
38 __const void *__restrict __src, size_t __n) __THROW;
39 /* Copy N bytes of SRC to DEST, guaranteeing
40 correct behavior for overlapping strings. */
41 extern void *memmove (void *__dest, __const void *__src, size_t __n)
44 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
45 Return the position in DEST one byte past where C was copied,
46 or NULL if C was not found in the first N bytes of SRC. */
47 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN
48 extern void *memccpy (void *__restrict __dest, __const void *__restrict __src,
54 /* Set N bytes of S to C. */
55 extern void *memset (void *__s, int __c, size_t __n) __THROW;
57 /* Compare N bytes of S1 and S2. */
58 extern int memcmp (__const void *__s1, __const void *__s2, size_t __n)
59 __THROW __attribute_pure__;
61 /* Search N bytes of S for C. */
62 extern void *memchr (__const void *__s, int __c, size_t __n)
63 __THROW __attribute_pure__;
66 /* Search in S for C. This is similar to `memchr' but there is no
68 extern void *rawmemchr (__const void *__s, int __c) __THROW __attribute_pure__;
71 /* Search N bytes of S for the final occurrence of C. */
72 extern void *memrchr (__const void *__s, int __c, size_t __n)
73 __THROW __attribute_pure__;
76 /* Copy SRC to DEST. */
77 extern char *strcpy (char *__restrict __dest, __const char *__restrict __src)
79 /* Copy no more than N characters of SRC to DEST. */
80 extern char *strncpy (char *__restrict __dest,
81 __const char *__restrict __src, size_t __n) __THROW;
83 /* Append SRC onto DEST. */
84 extern char *strcat (char *__restrict __dest, __const char *__restrict __src)
86 /* Append no more than N characters from SRC onto DEST. */
87 extern char *strncat (char *__restrict __dest, __const char *__restrict __src,
90 /* Compare S1 and S2. */
91 extern int strcmp (__const char *__s1, __const char *__s2)
92 __THROW __attribute_pure__;
93 /* Compare N characters of S1 and S2. */
94 extern int strncmp (__const char *__s1, __const char *__s2, size_t __n)
95 __THROW __attribute_pure__;
97 /* Compare the collated forms of S1 and S2. */
98 extern int strcoll (__const char *__s1, __const char *__s2)
99 __THROW __attribute_pure__;
100 /* Put a transformation of SRC into no more than N bytes of DEST. */
101 extern size_t strxfrm (char *__restrict __dest,
102 __const char *__restrict __src, size_t __n) __THROW;
106 /* The following functions are equivalent to the both above but they
107 take the locale they use for the collation as an extra argument.
108 This is not standardsized but something like will come. */
109 # include <xlocale.h>
111 /* Compare the collated forms of S1 and S2 using rules from L. */
112 extern int __strcoll_l (__const char *__s1, __const char *__s2, __locale_t __l)
113 __THROW __attribute_pure__;
114 /* Put a transformation of SRC into no more than N bytes of DEST. */
115 extern size_t __strxfrm_l (char *__dest, __const char *__src, size_t __n,
116 __locale_t __l) __THROW;
119 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
120 /* Duplicate S, returning an identical malloc'd string. */
121 extern char *strdup (__const char *__s) __THROW __attribute_malloc__;
124 /* Return a malloc'd copy of at most N bytes of STRING. The
125 resultant string is terminated even if no null terminator
126 appears before STRING[N]. */
127 #if defined __USE_GNU
128 extern char *strndup (__const char *__string, size_t __n)
129 __THROW __attribute_malloc__;
132 #if defined __USE_GNU && defined __GNUC__
133 /* Duplicate S, returning an identical alloca'd string. */
134 # define strdupa(s) \
137 __const char *__old = (s); \
138 size_t __len = strlen (__old) + 1; \
139 char *__new = (char *) __builtin_alloca (__len); \
140 (char *) memcpy (__new, __old, __len); \
143 /* Return an alloca'd copy of at most N bytes of string. */
144 # define strndupa(s, n) \
147 __const char *__old = (s); \
148 size_t __len = strnlen (__old, (n)); \
149 char *__new = (char *) __builtin_alloca (__len + 1); \
150 __new[__len] = '\0'; \
151 (char *) memcpy (__new, __old, __len); \
155 /* Find the first occurrence of C in S. */
156 extern char *strchr (__const char *__s, int __c) __THROW __attribute_pure__;
157 /* Find the last occurrence of C in S. */
158 extern char *strrchr (__const char *__s, int __c) __THROW __attribute_pure__;
161 /* This funciton is similar to `strchr'. But it returns a pointer to
162 the closing NUL byte in case C is not found in S. */
163 extern char *strchrnul (__const char *__s, int __c) __THROW __attribute_pure__;
166 /* Return the length of the initial segment of S which
167 consists entirely of characters not in REJECT. */
168 extern size_t strcspn (__const char *__s, __const char *__reject)
169 __THROW __attribute_pure__;
170 /* Return the length of the initial segment of S which
171 consists entirely of characters in ACCEPT. */
172 extern size_t strspn (__const char *__s, __const char *__accept)
173 __THROW __attribute_pure__;
174 /* Find the first occurrence in S of any character in ACCEPT. */
175 extern char *strpbrk (__const char *__s, __const char *__accept)
176 __THROW __attribute_pure__;
177 /* Find the first occurrence of NEEDLE in HAYSTACK. */
178 extern char *strstr (__const char *__haystack, __const char *__needle)
179 __THROW __attribute_pure__;
182 /* Similar to `strstr' but this function ignores the case of both strings. */
183 extern char *strcasestr (__const char *__haystack, __const char *__needle)
184 __THROW __attribute_pure__;
187 /* Divide S into tokens separated by characters in DELIM. */
188 extern char *strtok (char *__restrict __s, __const char *__restrict __delim)
191 /* Divide S into tokens separated by characters in DELIM. Information
192 passed between calls are stored in SAVE_PTR. */
193 extern char *__strtok_r (char *__restrict __s,
194 __const char *__restrict __delim,
195 char **__restrict __save_ptr) __THROW;
196 #if defined __USE_POSIX || defined __USE_MISC
197 extern char *strtok_r (char *__restrict __s, __const char *__restrict __delim,
198 char **__restrict __save_ptr) __THROW;
202 /* Find the first occurrence of NEEDLE in HAYSTACK.
203 NEEDLE is NEEDLELEN bytes long;
204 HAYSTACK is HAYSTACKLEN bytes long. */
205 extern void *memmem (__const void *__haystack, size_t __haystacklen,
206 __const void *__needle, size_t __needlelen)
207 __THROW __attribute_pure__;
209 /* Copy N bytes of SRC to DEST, return pointer to bytes after the
210 last written byte. */
211 extern void *__mempcpy (void *__restrict __dest,
212 __const void *__restrict __src, size_t __n) __THROW;
213 extern void *mempcpy (void *__restrict __dest,
214 __const void *__restrict __src, size_t __n) __THROW;
218 /* Return the length of S. */
219 extern size_t strlen (__const char *__s) __THROW __attribute_pure__;
222 /* Find the length of STRING, but scan at most MAXLEN characters.
223 If no '\0' terminator is found in that many characters, return MAXLEN. */
224 extern size_t strnlen (__const char *__string, size_t __maxlen)
225 __THROW __attribute_pure__;
229 /* Return a string describing the meaning of the `errno' code in ERRNUM. */
230 extern char *strerror (int __errnum) __THROW;
232 /* Reentrant versions of `strerror'. If a temporary buffer is required,
233 at most BUFLEN bytes of BUF will be used. These symbols are _NOT_ intended
234 to be applications, and can change at any time. */
235 extern char *_glibc_strerror_r (int __errnum, char *__buf, size_t __buflen) __THROW;
236 extern int _susv3_strerror_r (int __errnum, char *__buf, size_t buflen) __THROW;
238 #if defined(__USE_XOPEN2K) && !defined(__USE_GNU)
240 extern int __REDIRECT (strerror_r,
241 (int __errnum, char *__buf, size_t buflen) __THROW,
244 # define strerror_r _susv3_strerror_r
246 #elif defined(__USE_MISC)
248 extern char *__REDIRECT (strerror_r,
249 (int __errnum, char *__buf, size_t buflen) __THROW,
252 # define strerror_r _glibc_strerror_r
256 /* We define this function always since `bzero' is sometimes needed when
257 the namespace rules does not allow this. */
258 extern void __bzero (void *__s, size_t __n) __THROW;
260 #if defined __USE_BSD
261 /* Copy N bytes of SRC to DEST (like memmove, but args reversed). */
262 extern void bcopy (__const void *__src, void *__dest, size_t __n) __THROW;
264 /* Set N bytes of S to 0. */
265 extern void bzero (void *__s, size_t __n) __THROW;
267 /* Compare N bytes of S1 and S2 (same as memcmp). */
268 extern int bcmp (__const void *__s1, __const void *__s2, size_t __n)
269 __THROW __attribute_pure__;
271 /* Find the first occurrence of C in S (same as strchr). */
272 extern char *index (__const char *__s, int __c) __THROW __attribute_pure__;
274 /* Find the last occurrence of C in S (same as strrchr). */
275 extern char *rindex (__const char *__s, int __c) __THROW __attribute_pure__;
277 /* Return the position of the first bit set in I, or 0 if none are set.
278 The least-significant bit is position 1, the most-significant 32. */
279 extern int ffs (int __i) __THROW __attribute__ ((__const__));
281 /* The following two functions are non-standard but necessary for non-32 bit
284 /*# ifdef __USE_GNU*/
285 extern int ffsl (long int __l) __THROW __attribute__ ((__const__));
287 __extension__ extern int ffsll (long long int __ll)
288 __THROW __attribute__ ((__const__));
292 /* Compare S1 and S2, ignoring case. */
293 extern int strcasecmp (__const char *__s1, __const char *__s2)
294 __THROW __attribute_pure__;
296 /* Compare no more than N chars of S1 and S2, ignoring case. */
297 extern int strncasecmp (__const char *__s1, __const char *__s2, size_t __n)
298 __THROW __attribute_pure__;
299 #endif /* Use BSD. */
303 /* Again versions of a few functions which use the given locale instead
304 of the global one. */
305 extern int __strcasecmp_l (__const char *__s1, __const char *__s2,
306 __locale_t __loc) __THROW __attribute_pure__;
308 extern int __strncasecmp_l (__const char *__s1, __const char *__s2,
309 size_t __n, __locale_t __loc)
310 __THROW __attribute_pure__;
314 /* Return the next DELIM-delimited token from *STRINGP,
315 terminating it with a '\0', and update *STRINGP to point past it. */
316 extern char *strsep (char **__restrict __stringp,
317 __const char *__restrict __delim) __THROW;
322 /* Compare S1 and S2 as strings holding name & indices/version numbers. */
323 extern int strverscmp (__const char *__s1, __const char *__s2)
324 __THROW __attribute_pure__;
327 /* Return a string describing the meaning of the signal number in SIG. */
328 extern char *strsignal (int __sig) __THROW;
330 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST. */
331 extern char *__stpcpy (char *__restrict __dest, __const char *__restrict __src)
333 extern char *stpcpy (char *__restrict __dest, __const char *__restrict __src)
336 /* Copy no more than N characters of SRC to DEST, returning the address of
337 the last character written into DEST. */
338 extern char *__stpncpy (char *__restrict __dest,
339 __const char *__restrict __src, size_t __n) __THROW;
340 extern char *stpncpy (char *__restrict __dest,
341 __const char *__restrict __src, size_t __n) __THROW;
344 /* Sautee STRING briskly. */
345 extern char *strfry (char *__string) __THROW;
347 /* Frobnicate N bytes of S. */
348 extern void *memfrob (void *__s, size_t __n) __THROW;
352 /* Return the file name within directory of FILENAME. We don't
353 declare the function if the `basename' macro is available (defined
354 in <libgen.h>) which makes the XPG version of this function
356 extern char *basename (__const char *__filename) __THROW;
361 #if defined __GNUC__ && __GNUC__ >= 2
362 # if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ \
363 && !defined __NO_INLINE__ && !defined __cplusplus
364 /* When using GNU CC we provide some optimized versions of selected
365 functions from this header. There are two kinds of optimizations:
367 - machine-dependent optimizations, most probably using inline
368 assembler code; these might be quite expensive since the code
369 size can increase significantly.
370 These optimizations are not used unless the symbol
372 is defined before including this header.
374 - machine-independent optimizations which do not increase the
375 code size significantly and which optimize mainly situations
376 where one or more arguments are compile-time constants.
377 These optimizations are used always when the compiler is
380 One can inhibit all optimizations by defining __NO_STRING_INLINES. */
382 /* Get the machine-dependent optimizations (if any). */
383 # include <bits/string.h>
385 /* These are generic optimizations which do not add too much inline code. */
386 # include <bits/string2.h>
392 /* Two OpenBSD extension functions. */
393 extern size_t strlcat(char *__restrict dst, const char *__restrict src,
395 extern size_t strlcpy(char *__restrict dst, const char *__restrict src,
401 #endif /* string.h */