string/string.h

   1 /* Copyright (C) 1991-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   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.
   8
   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.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      ISO C99 Standard: 7.21 String handling  <string.h>
  20  */
  21
  22 #ifndef _STRING_H
  23 #define _STRING_H       1
  24
  25 #include <features.h>
  26
  27 __BEGIN_DECLS
  28
  29 /* Get size_t and NULL from <stddef.h>.  */
  30 #define __need_size_t
  31 #define __need_NULL
  32 #include <stddef.h>
  33
  34 /* Provide correct C++ prototypes, and indicate this to the caller.  This
  35    requires a compatible C++ standard library.  As a heuristic, we provide
  36    these when the compiler indicates full conformance with C++98 or later,
  37    and for older GCC versions that are known to provide a compatible
  38    libstdc++.  */
  39 #if defined __cplusplus && (__cplusplus >= 199711L || __GNUC_PREREQ (4, 4))
  40 # define __CORRECT_ISO_CPP_STRING_H_PROTO
  41 #endif
  42
  43
  44 __BEGIN_NAMESPACE_STD
  45 /* Copy N bytes of SRC to DEST.  */
  46 extern void *memcpy (void *__restrict __dest, const void *__restrict __src,
  47                      size_t __n) __THROW __nonnull ((1, 2));
  48 /* Copy N bytes of SRC to DEST, guaranteeing
  49    correct behavior for overlapping strings.  */
  50 extern void *memmove (void *__dest, const void *__src, size_t __n)
  51      __THROW __nonnull ((1, 2));
  52 __END_NAMESPACE_STD
  53
  54 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
  55    Return the position in DEST one byte past where C was copied,
  56    or NULL if C was not found in the first N bytes of SRC.  */
  57 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN
  58 extern void *memccpy (void *__restrict __dest, const void *__restrict __src,
  59                       int __c, size_t __n)
  60      __THROW __nonnull ((1, 2));
  61 #endif /* SVID.  */
  62
  63
  64 __BEGIN_NAMESPACE_STD
  65 /* Set N bytes of S to C.  */
  66 extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
  67
  68 /* Compare N bytes of S1 and S2.  */
  69 extern int memcmp (const void *__s1, const void *__s2, size_t __n)
  70      __THROW __attribute_pure__ __nonnull ((1, 2));
  71
  72 /* Search N bytes of S for C.  */
  73 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
  74 extern "C++"
  75 {
  76 extern void *memchr (void *__s, int __c, size_t __n)
  77       __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1));
  78 extern const void *memchr (const void *__s, int __c, size_t __n)
  79       __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1));
  80
  81 # ifdef __OPTIMIZE__
  82 __extern_always_inline void *
  83 memchr (void *__s, int __c, size_t __n) __THROW
  84 {
  85   return __builtin_memchr (__s, __c, __n);
  86 }
  87
  88 __extern_always_inline const void *
  89 memchr (const void *__s, int __c, size_t __n) __THROW
  90 {
  91   return __builtin_memchr (__s, __c, __n);
  92 }
  93 # endif
  94 }
  95 #else
  96 extern void *memchr (const void *__s, int __c, size_t __n)
  97       __THROW __attribute_pure__ __nonnull ((1));
  98 #endif
  99 __END_NAMESPACE_STD
 100
 101 #ifdef __USE_GNU
 102 /* Search in S for C.  This is similar to `memchr' but there is no
 103    length limit.  */
 104 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 105 extern "C++" void *rawmemchr (void *__s, int __c)
 106      __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1));
 107 extern "C++" const void *rawmemchr (const void *__s, int __c)
 108      __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1));
 109 # else
 110 extern void *rawmemchr (const void *__s, int __c)
 111      __THROW __attribute_pure__ __nonnull ((1));
 112 # endif
 113
 114 /* Search N bytes of S for the final occurrence of C.  */
 115 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 116 extern "C++" void *memrchr (void *__s, int __c, size_t __n)
 117       __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1));
 118 extern "C++" const void *memrchr (const void *__s, int __c, size_t __n)
 119       __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1));
 120 # else
 121 extern void *memrchr (const void *__s, int __c, size_t __n)
 122       __THROW __attribute_pure__ __nonnull ((1));
 123 # endif
 124 #endif
 125
 126
 127 __BEGIN_NAMESPACE_STD
 128 /* Copy SRC to DEST.  */
 129 extern char *strcpy (char *__restrict __dest, const char *__restrict __src)
 130      __THROW __nonnull ((1, 2));
 131 /* Copy no more than N characters of SRC to DEST.  */
 132 extern char *strncpy (char *__restrict __dest,
 133                       const char *__restrict __src, size_t __n)
 134      __THROW __nonnull ((1, 2));
 135
 136 /* Append SRC onto DEST.  */
 137 extern char *strcat (char *__restrict __dest, const char *__restrict __src)
 138      __THROW __nonnull ((1, 2));
 139 /* Append no more than N characters from SRC onto DEST.  */
 140 extern char *strncat (char *__restrict __dest, const char *__restrict __src,
 141                       size_t __n) __THROW __nonnull ((1, 2));
 142
 143 /* Compare S1 and S2.  */
 144 extern int strcmp (const char *__s1, const char *__s2)
 145      __THROW __attribute_pure__ __nonnull ((1, 2));
 146 /* Compare N characters of S1 and S2.  */
 147 extern int strncmp (const char *__s1, const char *__s2, size_t __n)
 148      __THROW __attribute_pure__ __nonnull ((1, 2));
 149
 150 /* Compare the collated forms of S1 and S2.  */
 151 extern int strcoll (const char *__s1, const char *__s2)
 152      __THROW __attribute_pure__ __nonnull ((1, 2));
 153 /* Put a transformation of SRC into no more than N bytes of DEST.  */
 154 extern size_t strxfrm (char *__restrict __dest,
 155                        const char *__restrict __src, size_t __n)
 156      __THROW __nonnull ((2));
 157 __END_NAMESPACE_STD
 158
 159 #ifdef __USE_XOPEN2K8
 160 /* The following functions are equivalent to the both above but they
 161    take the locale they use for the collation as an extra argument.
 162    This is not standardsized but something like will come.  */
 163 # include <xlocale.h>
 164
 165 /* Compare the collated forms of S1 and S2 using rules from L.  */
 166 extern int strcoll_l (const char *__s1, const char *__s2, __locale_t __l)
 167      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 168 /* Put a transformation of SRC into no more than N bytes of DEST.  */
 169 extern size_t strxfrm_l (char *__dest, const char *__src, size_t __n,
 170                          __locale_t __l) __THROW __nonnull ((2, 4));
 171 #endif
 172
 173 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED \
 174     || defined __USE_XOPEN2K8
 175 /* Duplicate S, returning an identical malloc'd string.  */
 176 extern char *strdup (const char *__s)
 177      __THROW __attribute_malloc__ __nonnull ((1));
 178 #endif
 179
 180 /* Return a malloc'd copy of at most N bytes of STRING.  The
 181    resultant string is terminated even if no null terminator
 182    appears before STRING[N].  */
 183 #if defined __USE_XOPEN2K8
 184 extern char *strndup (const char *__string, size_t __n)
 185      __THROW __attribute_malloc__ __nonnull ((1));
 186 #endif
 187
 188 #if defined __USE_GNU && defined __GNUC__
 189 /* Duplicate S, returning an identical alloca'd string.  */
 190 # define strdupa(s)                                                           \
 191   (__extension__                                                              \
 192     ({                                                                        \
 193       const char *__old = (s);                                                \
 194       size_t __len = strlen (__old) + 1;                                      \
 195       char *__new = (char *) __builtin_alloca (__len);                        \
 196       (char *) memcpy (__new, __old, __len);                                  \
 197     }))
 198
 199 /* Return an alloca'd copy of at most N bytes of string.  */
 200 # define strndupa(s, n)                                                       \
 201   (__extension__                                                              \
 202     ({                                                                        \
 203       const char *__old = (s);                                                \
 204       size_t __len = strnlen (__old, (n));                                    \
 205       char *__new = (char *) __builtin_alloca (__len + 1);                    \
 206       __new[__len] = '\0';                                                    \
 207       (char *) memcpy (__new, __old, __len);                                  \
 208     }))
 209 #endif
 210
 211 __BEGIN_NAMESPACE_STD
 212 /* Find the first occurrence of C in S.  */
 213 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 214 extern "C++"
 215 {
 216 extern char *strchr (char *__s, int __c)
 217      __THROW __asm ("strchr") __attribute_pure__ __nonnull ((1));
 218 extern const char *strchr (const char *__s, int __c)
 219      __THROW __asm ("strchr") __attribute_pure__ __nonnull ((1));
 220
 221 # ifdef __OPTIMIZE__
 222 __extern_always_inline char *
 223 strchr (char *__s, int __c) __THROW
 224 {
 225   return __builtin_strchr (__s, __c);
 226 }
 227
 228 __extern_always_inline const char *
 229 strchr (const char *__s, int __c) __THROW
 230 {
 231   return __builtin_strchr (__s, __c);
 232 }
 233 # endif
 234 }
 235 #else
 236 extern char *strchr (const char *__s, int __c)
 237      __THROW __attribute_pure__ __nonnull ((1));
 238 #endif
 239 /* Find the last occurrence of C in S.  */
 240 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 241 extern "C++"
 242 {
 243 extern char *strrchr (char *__s, int __c)
 244      __THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1));
 245 extern const char *strrchr (const char *__s, int __c)
 246      __THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1));
 247
 248 # ifdef __OPTIMIZE__
 249 __extern_always_inline char *
 250 strrchr (char *__s, int __c) __THROW
 251 {
 252   return __builtin_strrchr (__s, __c);
 253 }
 254
 255 __extern_always_inline const char *
 256 strrchr (const char *__s, int __c) __THROW
 257 {
 258   return __builtin_strrchr (__s, __c);
 259 }
 260 # endif
 261 }
 262 #else
 263 extern char *strrchr (const char *__s, int __c)
 264      __THROW __attribute_pure__ __nonnull ((1));
 265 #endif
 266 __END_NAMESPACE_STD
 267
 268 #ifdef __USE_GNU
 269 /* This function is similar to `strchr'.  But it returns a pointer to
 270    the closing NUL byte in case C is not found in S.  */
 271 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 272 extern "C++" char *strchrnul (char *__s, int __c)
 273      __THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1));
 274 extern "C++" const char *strchrnul (const char *__s, int __c)
 275      __THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1));
 276 # else
 277 extern char *strchrnul (const char *__s, int __c)
 278      __THROW __attribute_pure__ __nonnull ((1));
 279 # endif
 280 #endif
 281
 282 __BEGIN_NAMESPACE_STD
 283 /* Return the length of the initial segment of S which
 284    consists entirely of characters not in REJECT.  */
 285 extern size_t strcspn (const char *__s, const char *__reject)
 286      __THROW __attribute_pure__ __nonnull ((1, 2));
 287 /* Return the length of the initial segment of S which
 288    consists entirely of characters in ACCEPT.  */
 289 extern size_t strspn (const char *__s, const char *__accept)
 290      __THROW __attribute_pure__ __nonnull ((1, 2));
 291 /* Find the first occurrence in S of any character in ACCEPT.  */
 292 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 293 extern "C++"
 294 {
 295 extern char *strpbrk (char *__s, const char *__accept)
 296      __THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
 297 extern const char *strpbrk (const char *__s, const char *__accept)
 298      __THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
 299
 300 # ifdef __OPTIMIZE__
 301 __extern_always_inline char *
 302 strpbrk (char *__s, const char *__accept) __THROW
 303 {
 304   return __builtin_strpbrk (__s, __accept);
 305 }
 306
 307 __extern_always_inline const char *
 308 strpbrk (const char *__s, const char *__accept) __THROW
 309 {
 310   return __builtin_strpbrk (__s, __accept);
 311 }
 312 # endif
 313 }
 314 #else
 315 extern char *strpbrk (const char *__s, const char *__accept)
 316      __THROW __attribute_pure__ __nonnull ((1, 2));
 317 #endif
 318 /* Find the first occurrence of NEEDLE in HAYSTACK.  */
 319 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 320 extern "C++"
 321 {
 322 extern char *strstr (char *__haystack, const char *__needle)
 323      __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
 324 extern const char *strstr (const char *__haystack, const char *__needle)
 325      __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
 326
 327 # ifdef __OPTIMIZE__
 328 __extern_always_inline char *
 329 strstr (char *__haystack, const char *__needle) __THROW
 330 {
 331   return __builtin_strstr (__haystack, __needle);
 332 }
 333
 334 __extern_always_inline const char *
 335 strstr (const char *__haystack, const char *__needle) __THROW
 336 {
 337   return __builtin_strstr (__haystack, __needle);
 338 }
 339 # endif
 340 }
 341 #else
 342 extern char *strstr (const char *__haystack, const char *__needle)
 343      __THROW __attribute_pure__ __nonnull ((1, 2));
 344 #endif
 345
 346
 347 /* Divide S into tokens separated by characters in DELIM.  */
 348 extern char *strtok (char *__restrict __s, const char *__restrict __delim)
 349      __THROW __nonnull ((2));
 350 __END_NAMESPACE_STD
 351
 352 /* Divide S into tokens separated by characters in DELIM.  Information
 353    passed between calls are stored in SAVE_PTR.  */
 354 extern char *__strtok_r (char *__restrict __s,
 355                          const char *__restrict __delim,
 356                          char **__restrict __save_ptr)
 357      __THROW __nonnull ((2, 3));
 358 #if defined __USE_POSIX || defined __USE_MISC
 359 extern char *strtok_r (char *__restrict __s, const char *__restrict __delim,
 360                        char **__restrict __save_ptr)
 361      __THROW __nonnull ((2, 3));
 362 #endif
 363
 364 #ifdef __USE_GNU
 365 /* Similar to `strstr' but this function ignores the case of both strings.  */
 366 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 367 extern "C++" char *strcasestr (char *__haystack, const char *__needle)
 368      __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
 369 extern "C++" const char *strcasestr (const char *__haystack,
 370                                      const char *__needle)
 371      __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
 372 # else
 373 extern char *strcasestr (const char *__haystack, const char *__needle)
 374      __THROW __attribute_pure__ __nonnull ((1, 2));
 375 # endif
 376 #endif
 377
 378 #ifdef __USE_GNU
 379 /* Find the first occurrence of NEEDLE in HAYSTACK.
 380    NEEDLE is NEEDLELEN bytes long;
 381    HAYSTACK is HAYSTACKLEN bytes long.  */
 382 extern void *memmem (const void *__haystack, size_t __haystacklen,
 383                      const void *__needle, size_t __needlelen)
 384      __THROW __attribute_pure__ __nonnull ((1, 3));
 385
 386 /* Copy N bytes of SRC to DEST, return pointer to bytes after the
 387    last written byte.  */
 388 extern void *__mempcpy (void *__restrict __dest,
 389                         const void *__restrict __src, size_t __n)
 390      __THROW __nonnull ((1, 2));
 391 extern void *mempcpy (void *__restrict __dest,
 392                       const void *__restrict __src, size_t __n)
 393      __THROW __nonnull ((1, 2));
 394 #endif
 395
 396
 397 __BEGIN_NAMESPACE_STD
 398 /* Return the length of S.  */
 399 extern size_t strlen (const char *__s)
 400      __THROW __attribute_pure__ __nonnull ((1));
 401 __END_NAMESPACE_STD
 402
 403 #ifdef  __USE_XOPEN2K8
 404 /* Find the length of STRING, but scan at most MAXLEN characters.
 405    If no '\0' terminator is found in that many characters, return MAXLEN.  */
 406 extern size_t strnlen (const char *__string, size_t __maxlen)
 407      __THROW __attribute_pure__ __nonnull ((1));
 408 #endif
 409
 410
 411 __BEGIN_NAMESPACE_STD
 412 /* Return a string describing the meaning of the `errno' code in ERRNUM.  */
 413 extern char *strerror (int __errnum) __THROW;
 414 __END_NAMESPACE_STD
 415 #if defined __USE_XOPEN2K || defined __USE_MISC
 416 /* Reentrant version of `strerror'.
 417    There are 2 flavors of `strerror_r', GNU which returns the string
 418    and may or may not use the supplied temporary buffer and POSIX one
 419    which fills the string into the buffer.
 420    To use the POSIX version, -D_XOPEN_SOURCE=600 or -D_POSIX_C_SOURCE=200112L
 421    without -D_GNU_SOURCE is needed, otherwise the GNU version is
 422    preferred.  */
 423 # if defined __USE_XOPEN2K && !defined __USE_GNU
 424 /* Fill BUF with a string describing the meaning of the `errno' code in
 425    ERRNUM.  */
 426 #  ifdef __REDIRECT_NTH
 427 extern int __REDIRECT_NTH (strerror_r,
 428                            (int __errnum, char *__buf, size_t __buflen),
 429                            __xpg_strerror_r) __nonnull ((2));
 430 #  else
 431 extern int __xpg_strerror_r (int __errnum, char *__buf, size_t __buflen)
 432      __THROW __nonnull ((2));
 433 #   define strerror_r __xpg_strerror_r
 434 #  endif
 435 # else
 436 /* If a temporary buffer is required, at most BUFLEN bytes of BUF will be
 437    used.  */
 438 extern char *strerror_r (int __errnum, char *__buf, size_t __buflen)
 439      __THROW __nonnull ((2)) __wur;
 440 # endif
 441 #endif
 442
 443 #ifdef __USE_XOPEN2K8
 444 /* Translate error number to string according to the locale L.  */
 445 extern char *strerror_l (int __errnum, __locale_t __l) __THROW;
 446 #endif
 447
 448
 449 /* We define this function always since `bzero' is sometimes needed when
 450    the namespace rules does not allow this.  */
 451 extern void __bzero (void *__s, size_t __n) __THROW __nonnull ((1));
 452
 453 #ifdef __USE_BSD
 454 /* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
 455 extern void bcopy (const void *__src, void *__dest, size_t __n)
 456      __THROW __nonnull ((1, 2));
 457
 458 /* Set N bytes of S to 0.  */
 459 extern void bzero (void *__s, size_t __n) __THROW __nonnull ((1));
 460
 461 /* Compare N bytes of S1 and S2 (same as memcmp).  */
 462 extern int bcmp (const void *__s1, const void *__s2, size_t __n)
 463      __THROW __attribute_pure__ __nonnull ((1, 2));
 464
 465 /* Find the first occurrence of C in S (same as strchr).  */
 466 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 467 extern "C++"
 468 {
 469 extern char *index (char *__s, int __c)
 470      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
 471 extern const char *index (const char *__s, int __c)
 472      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
 473
 474 #  if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO
 475 __extern_always_inline char *
 476 index (char *__s, int __c) __THROW
 477 {
 478   return __builtin_index (__s, __c);
 479 }
 480
 481 __extern_always_inline const char *
 482 index (const char *__s, int __c) __THROW
 483 {
 484   return __builtin_index (__s, __c);
 485 }
 486 #  endif
 487 }
 488 # else
 489 extern char *index (const char *__s, int __c)
 490      __THROW __attribute_pure__ __nonnull ((1));
 491 # endif
 492
 493 /* Find the last occurrence of C in S (same as strrchr).  */
 494 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 495 extern "C++"
 496 {
 497 extern char *rindex (char *__s, int __c)
 498      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
 499 extern const char *rindex (const char *__s, int __c)
 500      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
 501
 502 #  if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO
 503 __extern_always_inline char *
 504 rindex (char *__s, int __c) __THROW
 505 {
 506   return __builtin_rindex (__s, __c);
 507 }
 508
 509 __extern_always_inline const char *
 510 rindex (const char *__s, int __c) __THROW
 511 {
 512   return __builtin_rindex (__s, __c);
 513 }
 514 #endif
 515 }
 516 # else
 517 extern char *rindex (const char *__s, int __c)
 518      __THROW __attribute_pure__ __nonnull ((1));
 519 # endif
 520
 521 /* Return the position of the first bit set in I, or 0 if none are set.
 522    The least-significant bit is position 1, the most-significant 32.  */
 523 extern int ffs (int __i) __THROW __attribute__ ((__const__));
 524
 525 /* The following two functions are non-standard but necessary for non-32 bit
 526    platforms.  */
 527 # ifdef __USE_GNU
 528 extern int ffsl (long int __l) __THROW __attribute__ ((__const__));
 529 __extension__ extern int ffsll (long long int __ll)
 530      __THROW __attribute__ ((__const__));
 531 # endif
 532
 533 /* Compare S1 and S2, ignoring case.  */
 534 extern int strcasecmp (const char *__s1, const char *__s2)
 535      __THROW __attribute_pure__ __nonnull ((1, 2));
 536
 537 /* Compare no more than N chars of S1 and S2, ignoring case.  */
 538 extern int strncasecmp (const char *__s1, const char *__s2, size_t __n)
 539      __THROW __attribute_pure__ __nonnull ((1, 2));
 540 #endif /* Use BSD.  */
 541
 542 #ifdef  __USE_GNU
 543 /* Again versions of a few functions which use the given locale instead
 544    of the global one.  */
 545 extern int strcasecmp_l (const char *__s1, const char *__s2,
 546                          __locale_t __loc)
 547      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 548
 549 extern int strncasecmp_l (const char *__s1, const char *__s2,
 550                           size_t __n, __locale_t __loc)
 551      __THROW __attribute_pure__ __nonnull ((1, 2, 4));
 552 #endif
 553
 554 #ifdef  __USE_BSD
 555 /* Return the next DELIM-delimited token from *STRINGP,
 556    terminating it with a '\0', and update *STRINGP to point past it.  */
 557 extern char *strsep (char **__restrict __stringp,
 558                      const char *__restrict __delim)
 559      __THROW __nonnull ((1, 2));
 560 #endif
 561
 562 #ifdef  __USE_XOPEN2K8
 563 /* Return a string describing the meaning of the signal number in SIG.  */
 564 extern char *strsignal (int __sig) __THROW;
 565
 566 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST.  */
 567 extern char *__stpcpy (char *__restrict __dest, const char *__restrict __src)
 568      __THROW __nonnull ((1, 2));
 569 extern char *stpcpy (char *__restrict __dest, const char *__restrict __src)
 570      __THROW __nonnull ((1, 2));
 571
 572 /* Copy no more than N characters of SRC to DEST, returning the address of
 573    the last character written into DEST.  */
 574 extern char *__stpncpy (char *__restrict __dest,
 575                         const char *__restrict __src, size_t __n)
 576      __THROW __nonnull ((1, 2));
 577 extern char *stpncpy (char *__restrict __dest,
 578                       const char *__restrict __src, size_t __n)
 579      __THROW __nonnull ((1, 2));
 580 #endif
 581
 582 #ifdef  __USE_GNU
 583 /* Compare S1 and S2 as strings holding name & indices/version numbers.  */
 584 extern int strverscmp (const char *__s1, const char *__s2)
 585      __THROW __attribute_pure__ __nonnull ((1, 2));
 586
 587 /* Sautee STRING briskly.  */
 588 extern char *strfry (char *__string) __THROW __nonnull ((1));
 589
 590 /* Frobnicate N bytes of S.  */
 591 extern void *memfrob (void *__s, size_t __n) __THROW __nonnull ((1));
 592
 593 # ifndef basename
 594 /* Return the file name within directory of FILENAME.  We don't
 595    declare the function if the `basename' macro is available (defined
 596    in <libgen.h>) which makes the XPG version of this function
 597    available.  */
 598 #  ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 599 extern "C++" char *basename (char *__filename)
 600      __THROW __asm ("basename") __nonnull ((1));
 601 extern "C++" const char *basename (const char *__filename)
 602      __THROW __asm ("basename") __nonnull ((1));
 603 #  else
 604 extern char *basename (const char *__filename) __THROW __nonnull ((1));
 605 #  endif
 606 # endif
 607 #endif
 608
 609
 610 #if defined __GNUC__ && __GNUC__ >= 2
 611 # if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ \
 612      && !defined __NO_INLINE__ && !defined __cplusplus
 613 /* When using GNU CC we provide some optimized versions of selected
 614    functions from this header.  There are two kinds of optimizations:
 615
 616    - machine-dependent optimizations, most probably using inline
 617      assembler code; these might be quite expensive since the code
 618      size can increase significantly.
 619      These optimizations are not used unless the symbol
 620         __USE_STRING_INLINES
 621      is defined before including this header.
 622
 623    - machine-independent optimizations which do not increase the
 624      code size significantly and which optimize mainly situations
 625      where one or more arguments are compile-time constants.
 626      These optimizations are used always when the compiler is
 627      taught to optimize.
 628
 629    One can inhibit all optimizations by defining __NO_STRING_INLINES.  */
 630
 631 /* Get the machine-dependent optimizations (if any).  */
 632 #  include <bits/string.h>
 633
 634 /* These are generic optimizations which do not add too much inline code.  */
 635 #  include <bits/string2.h>
 636 # endif
 637
 638 # if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
 639 /* Functions with security checks.  */
 640 #  include <bits/string3.h>
 641 # endif
 642 #endif
 643
 644 __END_DECLS
 645
 646 #endif /* string.h  */