string/string.h

   1 /* Copyright (C) 1991-1993,1995-2004,2007,2009 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 /*
  20  *      ISO C99 Standard: 7.21 String handling  <string.h>
  21  */
  22
  23 #ifndef _STRING_H
  24 #define _STRING_H       1
  25
  26 #include <features.h>
  27
  28 __BEGIN_DECLS
  29
  30 /* Get size_t and NULL from <stddef.h>.  */
  31 #define __need_size_t
  32 #define __need_NULL
  33 #include <stddef.h>
  34
  35 /* Tell the caller that we provide correct C++ prototypes.  */
  36 #if defined __cplusplus && __GNUC_PREREQ (4, 4)
  37 # define __CORRECT_ISO_CPP_STRING_H_PROTO
  38 #endif
  39
  40
  41 __BEGIN_NAMESPACE_STD
  42 /* Copy N bytes of SRC to DEST.  */
  43 extern void *memcpy (void *__restrict __dest,
  44                      __const void *__restrict __src, size_t __n)
  45      __THROW __nonnull ((1, 2));
  46 /* Copy N bytes of SRC to DEST, guaranteeing
  47    correct behavior for overlapping strings.  */
  48 extern void *memmove (void *__dest, __const void *__src, size_t __n)
  49      __THROW __nonnull ((1, 2));
  50 __END_NAMESPACE_STD
  51
  52 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
  53    Return the position in DEST one byte past where C was copied,
  54    or NULL if C was not found in the first N bytes of SRC.  */
  55 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN
  56 extern void *memccpy (void *__restrict __dest, __const void *__restrict __src,
  57                       int __c, size_t __n)
  58      __THROW __nonnull ((1, 2));
  59 #endif /* SVID.  */
  60
  61
  62 __BEGIN_NAMESPACE_STD
  63 /* Set N bytes of S to C.  */
  64 extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
  65
  66 /* Compare N bytes of S1 and S2.  */
  67 extern int memcmp (__const void *__s1, __const void *__s2, size_t __n)
  68      __THROW __attribute_pure__ __nonnull ((1, 2));
  69
  70 /* Search N bytes of S for C.  */
  71 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
  72 extern "C++"
  73 {
  74 extern void *memchr (void *__s, int __c, size_t __n)
  75       __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1));
  76 extern __const void *memchr (__const void *__s, int __c, size_t __n)
  77       __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1));
  78
  79 # ifdef __OPTIMIZE__
  80 __extern_always_inline void *
  81 memchr (void *__s, int __c, size_t __n) __THROW
  82 {
  83   return __builtin_memchr (__s, __c, __n);
  84 }
  85
  86 __extern_always_inline __const void *
  87 memchr (__const void *__s, int __c, size_t __n) __THROW
  88 {
  89   return __builtin_memchr (__s, __c, __n);
  90 }
  91 # endif
  92 }
  93 #else
  94 extern void *memchr (__const void *__s, int __c, size_t __n)
  95       __THROW __attribute_pure__ __nonnull ((1));
  96 #endif
  97 __END_NAMESPACE_STD
  98
  99 #ifdef __USE_GNU
 100 /* Search in S for C.  This is similar to `memchr' but there is no
 101    length limit.  */
 102 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 103 extern "C++" void *rawmemchr (void *__s, int __c)
 104      __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1));
 105 extern "C++" __const void *rawmemchr (__const void *__s, int __c)
 106      __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1));
 107 # else
 108 extern void *rawmemchr (__const void *__s, int __c)
 109      __THROW __attribute_pure__ __nonnull ((1));
 110 # endif
 111
 112 /* Search N bytes of S for the final occurrence of C.  */
 113 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 114 extern "C++" void *memrchr (void *__s, int __c, size_t __n)
 115       __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1));
 116 extern "C++" __const void *memrchr (__const void *__s, int __c, size_t __n)
 117       __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1));
 118 # else
 119 extern void *memrchr (__const void *__s, int __c, size_t __n)
 120       __THROW __attribute_pure__ __nonnull ((1));
 121 # endif
 122 #endif
 123
 124
 125 __BEGIN_NAMESPACE_STD
 126 /* Copy SRC to DEST.  */
 127 extern char *strcpy (char *__restrict __dest, __const char *__restrict __src)
 128      __THROW __nonnull ((1, 2));
 129 /* Copy no more than N characters of SRC to DEST.  */
 130 extern char *strncpy (char *__restrict __dest,
 131                       __const char *__restrict __src, size_t __n)
 132      __THROW __nonnull ((1, 2));
 133
 134 /* Append SRC onto DEST.  */
 135 extern char *strcat (char *__restrict __dest, __const char *__restrict __src)
 136      __THROW __nonnull ((1, 2));
 137 /* Append no more than N characters from SRC onto DEST.  */
 138 extern char *strncat (char *__restrict __dest, __const char *__restrict __src,
 139                       size_t __n) __THROW __nonnull ((1, 2));
 140
 141 /* Compare S1 and S2.  */
 142 extern int strcmp (__const char *__s1, __const char *__s2)
 143      __THROW __attribute_pure__ __nonnull ((1, 2));
 144 /* Compare N characters of S1 and S2.  */
 145 extern int strncmp (__const char *__s1, __const char *__s2, size_t __n)
 146      __THROW __attribute_pure__ __nonnull ((1, 2));
 147
 148 /* Compare the collated forms of S1 and S2.  */
 149 extern int strcoll (__const char *__s1, __const char *__s2)
 150      __THROW __attribute_pure__ __nonnull ((1, 2));
 151 /* Put a transformation of SRC into no more than N bytes of DEST.  */
 152 extern size_t strxfrm (char *__restrict __dest,
 153                        __const char *__restrict __src, size_t __n)
 154      __THROW __nonnull ((2));
 155 __END_NAMESPACE_STD
 156
 157 #ifdef __USE_XOPEN2K8
 158 /* The following functions are equivalent to the both above but they
 159    take the locale they use for the collation as an extra argument.
 160    This is not standardsized but something like will come.  */
 161 # include <xlocale.h>
 162
 163 /* Compare the collated forms of S1 and S2 using rules from L.  */
 164 extern int strcoll_l (__const char *__s1, __const char *__s2, __locale_t __l)
 165      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 166 /* Put a transformation of SRC into no more than N bytes of DEST.  */
 167 extern size_t strxfrm_l (char *__dest, __const char *__src, size_t __n,
 168                          __locale_t __l) __THROW __nonnull ((2, 4));
 169 #endif
 170
 171 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 172 /* Duplicate S, returning an identical malloc'd string.  */
 173 extern char *strdup (__const char *__s)
 174      __THROW __attribute_malloc__ __nonnull ((1));
 175 #endif
 176
 177 /* Return a malloc'd copy of at most N bytes of STRING.  The
 178    resultant string is terminated even if no null terminator
 179    appears before STRING[N].  */
 180 #if defined __USE_XOPEN2K8
 181 extern char *strndup (__const char *__string, size_t __n)
 182      __THROW __attribute_malloc__ __nonnull ((1));
 183 #endif
 184
 185 #if defined __USE_GNU && defined __GNUC__
 186 /* Duplicate S, returning an identical alloca'd string.  */
 187 # define strdupa(s)                                                           \
 188   (__extension__                                                              \
 189     ({                                                                        \
 190       __const char *__old = (s);                                              \
 191       size_t __len = strlen (__old) + 1;                                      \
 192       char *__new = (char *) __builtin_alloca (__len);                        \
 193       (char *) memcpy (__new, __old, __len);                                  \
 194     }))
 195
 196 /* Return an alloca'd copy of at most N bytes of string.  */
 197 # define strndupa(s, n)                                                       \
 198   (__extension__                                                              \
 199     ({                                                                        \
 200       __const char *__old = (s);                                              \
 201       size_t __len = strnlen (__old, (n));                                    \
 202       char *__new = (char *) __builtin_alloca (__len + 1);                    \
 203       __new[__len] = '\0';                                                    \
 204       (char *) memcpy (__new, __old, __len);                                  \
 205     }))
 206 #endif
 207
 208 __BEGIN_NAMESPACE_STD
 209 /* Find the first occurrence of C in S.  */
 210 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 211 extern "C++"
 212 {
 213 extern char *strchr (char *__s, int __c)
 214      __THROW __asm ("strchr") __attribute_pure__ __nonnull ((1));
 215 extern __const char *strchr (__const char *__s, int __c)
 216      __THROW __asm ("strchr") __attribute_pure__ __nonnull ((1));
 217
 218 # ifdef __OPTIMIZE__
 219 __extern_always_inline char *
 220 strchr (char *__s, int __c) __THROW
 221 {
 222   return __builtin_strchr (__s, __c);
 223 }
 224
 225 __extern_always_inline __const char *
 226 strchr (__const char *__s, int __c) __THROW
 227 {
 228   return __builtin_strchr (__s, __c);
 229 }
 230 # endif
 231 }
 232 #else
 233 extern char *strchr (__const char *__s, int __c)
 234      __THROW __attribute_pure__ __nonnull ((1));
 235 #endif
 236 /* Find the last occurrence of C in S.  */
 237 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 238 extern "C++"
 239 {
 240 extern char *strrchr (char *__s, int __c)
 241      __THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1));
 242 extern __const char *strrchr (__const char *__s, int __c)
 243      __THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1));
 244
 245 # ifdef __OPTIMIZE__
 246 __extern_always_inline char *
 247 strrchr (char *__s, int __c) __THROW
 248 {
 249   return __builtin_strrchr (__s, __c);
 250 }
 251
 252 __extern_always_inline __const char *
 253 strrchr (__const char *__s, int __c) __THROW
 254 {
 255   return __builtin_strrchr (__s, __c);
 256 }
 257 # endif
 258 }
 259 #else
 260 extern char *strrchr (__const char *__s, int __c)
 261      __THROW __attribute_pure__ __nonnull ((1));
 262 #endif
 263 __END_NAMESPACE_STD
 264
 265 #ifdef __USE_GNU
 266 /* This function is similar to `strchr'.  But it returns a pointer to
 267    the closing NUL byte in case C is not found in S.  */
 268 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 269 extern "C++" char *strchrnul (char *__s, int __c)
 270      __THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1));
 271 extern "C++" __const char *strchrnul (__const char *__s, int __c)
 272      __THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1));
 273 # else
 274 extern char *strchrnul (__const char *__s, int __c)
 275      __THROW __attribute_pure__ __nonnull ((1));
 276 # endif
 277 #endif
 278
 279 __BEGIN_NAMESPACE_STD
 280 /* Return the length of the initial segment of S which
 281    consists entirely of characters not in REJECT.  */
 282 extern size_t strcspn (__const char *__s, __const char *__reject)
 283      __THROW __attribute_pure__ __nonnull ((1, 2));
 284 /* Return the length of the initial segment of S which
 285    consists entirely of characters in ACCEPT.  */
 286 extern size_t strspn (__const char *__s, __const char *__accept)
 287      __THROW __attribute_pure__ __nonnull ((1, 2));
 288 /* Find the first occurrence in S of any character in ACCEPT.  */
 289 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 290 extern "C++"
 291 {
 292 extern char *strpbrk (char *__s, __const char *__accept)
 293      __THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
 294 extern __const char *strpbrk (__const char *__s, __const char *__accept)
 295      __THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
 296
 297 # ifdef __OPTIMIZE__
 298 __extern_always_inline char *
 299 strpbrk (char *__s, __const char *__accept) __THROW
 300 {
 301   return __builtin_strpbrk (__s, __accept);
 302 }
 303
 304 __extern_always_inline __const char *
 305 strpbrk (__const char *__s, __const char *__accept) __THROW
 306 {
 307   return __builtin_strpbrk (__s, __accept);
 308 }
 309 # endif
 310 }
 311 #else
 312 extern char *strpbrk (__const char *__s, __const char *__accept)
 313      __THROW __attribute_pure__ __nonnull ((1, 2));
 314 #endif
 315 /* Find the first occurrence of NEEDLE in HAYSTACK.  */
 316 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 317 extern "C++"
 318 {
 319 extern char *strstr (char *__haystack, __const char *__needle)
 320      __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
 321 extern __const char *strstr (__const char *__haystack,
 322                              __const char *__needle)
 323      __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
 324
 325 # ifdef __OPTIMIZE__
 326 __extern_always_inline char *
 327 strstr (char *__haystack, __const char *__needle) __THROW
 328 {
 329   return __builtin_strstr (__haystack, __needle);
 330 }
 331
 332 __extern_always_inline __const char *
 333 strstr (__const char *__haystack, __const char *__needle) __THROW
 334 {
 335   return __builtin_strstr (__haystack, __needle);
 336 }
 337 # endif
 338 }
 339 #else
 340 extern char *strstr (__const char *__haystack, __const char *__needle)
 341      __THROW __attribute_pure__ __nonnull ((1, 2));
 342 #endif
 343
 344
 345 /* Divide S into tokens separated by characters in DELIM.  */
 346 extern char *strtok (char *__restrict __s, __const char *__restrict __delim)
 347      __THROW __nonnull ((2));
 348 __END_NAMESPACE_STD
 349
 350 /* Divide S into tokens separated by characters in DELIM.  Information
 351    passed between calls are stored in SAVE_PTR.  */
 352 extern char *__strtok_r (char *__restrict __s,
 353                          __const char *__restrict __delim,
 354                          char **__restrict __save_ptr)
 355      __THROW __nonnull ((2, 3));
 356 #if defined __USE_POSIX || defined __USE_MISC
 357 extern char *strtok_r (char *__restrict __s, __const char *__restrict __delim,
 358                        char **__restrict __save_ptr)
 359      __THROW __nonnull ((2, 3));
 360 #endif
 361
 362 #ifdef __USE_GNU
 363 /* Similar to `strstr' but this function ignores the case of both strings.  */
 364 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 365 extern "C++" char *strcasestr (char *__haystack, __const char *__needle)
 366      __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
 367 extern "C++" __const char *strcasestr (__const char *__haystack,
 368                                        __const char *__needle)
 369      __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
 370 # else
 371 extern char *strcasestr (__const char *__haystack, __const char *__needle)
 372      __THROW __attribute_pure__ __nonnull ((1, 2));
 373 # endif
 374 #endif
 375
 376 #ifdef __USE_GNU
 377 /* Find the first occurrence of NEEDLE in HAYSTACK.
 378    NEEDLE is NEEDLELEN bytes long;
 379    HAYSTACK is HAYSTACKLEN bytes long.  */
 380 extern void *memmem (__const void *__haystack, size_t __haystacklen,
 381                      __const void *__needle, size_t __needlelen)
 382      __THROW __attribute_pure__ __nonnull ((1, 3));
 383
 384 /* Copy N bytes of SRC to DEST, return pointer to bytes after the
 385    last written byte.  */
 386 extern void *__mempcpy (void *__restrict __dest,
 387                         __const void *__restrict __src, size_t __n)
 388      __THROW __nonnull ((1, 2));
 389 extern void *mempcpy (void *__restrict __dest,
 390                       __const void *__restrict __src, size_t __n)
 391      __THROW __nonnull ((1, 2));
 392 #endif
 393
 394
 395 __BEGIN_NAMESPACE_STD
 396 /* Return the length of S.  */
 397 extern size_t strlen (__const char *__s)
 398      __THROW __attribute_pure__ __nonnull ((1));
 399 __END_NAMESPACE_STD
 400
 401 #ifdef  __USE_XOPEN2K8
 402 /* Find the length of STRING, but scan at most MAXLEN characters.
 403    If no '\0' terminator is found in that many characters, return MAXLEN.  */
 404 extern size_t strnlen (__const char *__string, size_t __maxlen)
 405      __THROW __attribute_pure__ __nonnull ((1));
 406 #endif
 407
 408
 409 __BEGIN_NAMESPACE_STD
 410 /* Return a string describing the meaning of the `errno' code in ERRNUM.  */
 411 extern char *strerror (int __errnum) __THROW;
 412 __END_NAMESPACE_STD
 413 #if defined __USE_XOPEN2K || defined __USE_MISC
 414 /* Reentrant version of `strerror'.
 415    There are 2 flavors of `strerror_r', GNU which returns the string
 416    and may or may not use the supplied temporary buffer and POSIX one
 417    which fills the string into the buffer.
 418    To use the POSIX version, -D_XOPEN_SOURCE=600 or -D_POSIX_C_SOURCE=200112L
 419    without -D_GNU_SOURCE is needed, otherwise the GNU version is
 420    preferred.  */
 421 # if defined __USE_XOPEN2K && !defined __USE_GNU
 422 /* Fill BUF with a string describing the meaning of the `errno' code in
 423    ERRNUM.  */
 424 #  ifdef __REDIRECT_NTH
 425 extern int __REDIRECT_NTH (strerror_r,
 426                            (int __errnum, char *__buf, size_t __buflen),
 427                            __xpg_strerror_r) __nonnull ((2));
 428 #  else
 429 extern int __xpg_strerror_r (int __errnum, char *__buf, size_t __buflen)
 430      __THROW __nonnull ((2));
 431 #   define strerror_r __xpg_strerror_r
 432 #  endif
 433 # else
 434 /* If a temporary buffer is required, at most BUFLEN bytes of BUF will be
 435    used.  */
 436 extern char *strerror_r (int __errnum, char *__buf, size_t __buflen)
 437      __THROW __nonnull ((2));
 438 # endif
 439 #endif
 440
 441 #ifdef __USE_XOPEN2K8
 442 /* Translate error number to string according to the locale L.  */
 443 extern char *strerror_l (int __errnum, __locale_t __l) __THROW;
 444 #endif
 445
 446
 447 /* We define this function always since `bzero' is sometimes needed when
 448    the namespace rules does not allow this.  */
 449 extern void __bzero (void *__s, size_t __n) __THROW __nonnull ((1));
 450
 451 #ifdef __USE_BSD
 452 /* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
 453 extern void bcopy (__const void *__src, void *__dest, size_t __n)
 454      __THROW __nonnull ((1, 2));
 455
 456 /* Set N bytes of S to 0.  */
 457 extern void bzero (void *__s, size_t __n) __THROW __nonnull ((1));
 458
 459 /* Compare N bytes of S1 and S2 (same as memcmp).  */
 460 extern int bcmp (__const void *__s1, __const void *__s2, size_t __n)
 461      __THROW __attribute_pure__ __nonnull ((1, 2));
 462
 463 /* Find the first occurrence of C in S (same as strchr).  */
 464 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 465 extern "C++"
 466 {
 467 extern char *index (char *__s, int __c)
 468      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
 469 extern __const char *index (__const char *__s, int __c)
 470      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
 471
 472 #  if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO
 473 __extern_always_inline char *
 474 index (char *__s, int __c) __THROW
 475 {
 476   return __builtin_index (__s, __c);
 477 }
 478
 479 __extern_always_inline __const char *
 480 index (__const char *__s, int __c) __THROW
 481 {
 482   return __builtin_index (__s, __c);
 483 }
 484 #  endif
 485 }
 486 # else
 487 extern char *index (__const char *__s, int __c)
 488      __THROW __attribute_pure__ __nonnull ((1));
 489 # endif
 490
 491 /* Find the last occurrence of C in S (same as strrchr).  */
 492 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 493 extern "C++"
 494 {
 495 extern char *rindex (char *__s, int __c)
 496      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
 497 extern __const char *rindex (__const char *__s, int __c)
 498      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
 499
 500 #  if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO
 501 __extern_always_inline char *
 502 rindex (char *__s, int __c) __THROW
 503 {
 504   return __builtin_rindex (__s, __c);
 505 }
 506
 507 __extern_always_inline __const char *
 508 rindex (__const char *__s, int __c) __THROW
 509 {
 510   return __builtin_rindex (__s, __c);
 511 }
 512 #endif
 513 }
 514 # else
 515 extern char *rindex (__const char *__s, int __c)
 516      __THROW __attribute_pure__ __nonnull ((1));
 517 # endif
 518
 519 /* Return the position of the first bit set in I, or 0 if none are set.
 520    The least-significant bit is position 1, the most-significant 32.  */
 521 extern int ffs (int __i) __THROW __attribute__ ((__const__));
 522
 523 /* The following two functions are non-standard but necessary for non-32 bit
 524    platforms.  */
 525 # ifdef __USE_GNU
 526 extern int ffsl (long int __l) __THROW __attribute__ ((__const__));
 527 #  ifdef __GNUC__
 528 __extension__ extern int ffsll (long long int __ll)
 529      __THROW __attribute__ ((__const__));
 530 #  endif
 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 __extern_always_inline
 639 /* Functions with security checks.  */
 640 #  include <bits/string3.h>
 641 # endif
 642 #endif
 643
 644 __END_DECLS
 645
 646 #endif /* string.h  */