string/string.h

   1 /* Copyright (C) 1991-2013 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 /* Tell the caller that we provide correct C++ prototypes.  */
  35 #if defined __cplusplus && __GNUC_PREREQ (4, 4)
  36 # define __CORRECT_ISO_CPP_STRING_H_PROTO
  37 #endif
  38
  39
  40 __BEGIN_NAMESPACE_STD
  41 /* Copy N bytes of SRC to DEST.  */
  42 extern void *memcpy (void *__restrict __dest, const void *__restrict __src,
  43                      size_t __n) __THROW __nonnull ((1, 2));
  44 /* Copy N bytes of SRC to DEST, guaranteeing
  45    correct behavior for overlapping strings.  */
  46 extern void *memmove (void *__dest, const void *__src, size_t __n)
  47      __THROW __nonnull ((1, 2));
  48 __END_NAMESPACE_STD
  49
  50 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
  51    Return the position in DEST one byte past where C was copied,
  52    or NULL if C was not found in the first N bytes of SRC.  */
  53 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN
  54 extern void *memccpy (void *__restrict __dest, const void *__restrict __src,
  55                       int __c, size_t __n)
  56      __THROW __nonnull ((1, 2));
  57 #endif /* SVID.  */
  58
  59
  60 __BEGIN_NAMESPACE_STD
  61 /* Set N bytes of S to C.  */
  62 extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
  63
  64 /* Compare N bytes of S1 and S2.  */
  65 extern int memcmp (const void *__s1, const void *__s2, size_t __n)
  66      __THROW __attribute_pure__ __nonnull ((1, 2));
  67
  68 /* Search N bytes of S for C.  */
  69 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
  70 extern "C++"
  71 {
  72 extern void *memchr (void *__s, int __c, size_t __n)
  73       __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1));
  74 extern const void *memchr (const void *__s, int __c, size_t __n)
  75       __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1));
  76
  77 # ifdef __OPTIMIZE__
  78 __extern_always_inline void *
  79 memchr (void *__s, int __c, size_t __n) __THROW
  80 {
  81   return __builtin_memchr (__s, __c, __n);
  82 }
  83
  84 __extern_always_inline const void *
  85 memchr (const void *__s, int __c, size_t __n) __THROW
  86 {
  87   return __builtin_memchr (__s, __c, __n);
  88 }
  89 # endif
  90 }
  91 #else
  92 extern void *memchr (const void *__s, int __c, size_t __n)
  93       __THROW __attribute_pure__ __nonnull ((1));
  94 #endif
  95 __END_NAMESPACE_STD
  96
  97 #ifdef __USE_GNU
  98 /* Search in S for C.  This is similar to `memchr' but there is no
  99    length limit.  */
 100 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 101 extern "C++" void *rawmemchr (void *__s, int __c)
 102      __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1));
 103 extern "C++" const void *rawmemchr (const void *__s, int __c)
 104      __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1));
 105 # else
 106 extern void *rawmemchr (const void *__s, int __c)
 107      __THROW __attribute_pure__ __nonnull ((1));
 108 # endif
 109
 110 /* Search N bytes of S for the final occurrence of C.  */
 111 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 112 extern "C++" void *memrchr (void *__s, int __c, size_t __n)
 113       __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1));
 114 extern "C++" const void *memrchr (const void *__s, int __c, size_t __n)
 115       __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1));
 116 # else
 117 extern void *memrchr (const void *__s, int __c, size_t __n)
 118       __THROW __attribute_pure__ __nonnull ((1));
 119 # endif
 120 #endif
 121
 122
 123 __BEGIN_NAMESPACE_STD
 124 /* Copy SRC to DEST.  */
 125 extern char *strcpy (char *__restrict __dest, const char *__restrict __src)
 126      __THROW __nonnull ((1, 2));
 127 /* Copy no more than N characters of SRC to DEST.  */
 128 extern char *strncpy (char *__restrict __dest,
 129                       const char *__restrict __src, size_t __n)
 130      __THROW __nonnull ((1, 2));
 131
 132 /* Append SRC onto DEST.  */
 133 extern char *strcat (char *__restrict __dest, const char *__restrict __src)
 134      __THROW __nonnull ((1, 2));
 135 /* Append no more than N characters from SRC onto DEST.  */
 136 extern char *strncat (char *__restrict __dest, const char *__restrict __src,
 137                       size_t __n) __THROW __nonnull ((1, 2));
 138
 139 /* Compare S1 and S2.  */
 140 extern int strcmp (const char *__s1, const char *__s2)
 141      __THROW __attribute_pure__ __nonnull ((1, 2));
 142 /* Compare N characters of S1 and S2.  */
 143 extern int strncmp (const char *__s1, const char *__s2, size_t __n)
 144      __THROW __attribute_pure__ __nonnull ((1, 2));
 145
 146 /* Compare the collated forms of S1 and S2.  */
 147 extern int strcoll (const char *__s1, const char *__s2)
 148      __THROW __attribute_pure__ __nonnull ((1, 2));
 149 /* Put a transformation of SRC into no more than N bytes of DEST.  */
 150 extern size_t strxfrm (char *__restrict __dest,
 151                        const char *__restrict __src, size_t __n)
 152      __THROW __nonnull ((2));
 153 __END_NAMESPACE_STD
 154
 155 #ifdef __USE_XOPEN2K8
 156 /* The following functions are equivalent to the both above but they
 157    take the locale they use for the collation as an extra argument.
 158    This is not standardsized but something like will come.  */
 159 # include <xlocale.h>
 160
 161 /* Compare the collated forms of S1 and S2 using rules from L.  */
 162 extern int strcoll_l (const char *__s1, const char *__s2, __locale_t __l)
 163      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 164 /* Put a transformation of SRC into no more than N bytes of DEST.  */
 165 extern size_t strxfrm_l (char *__dest, const char *__src, size_t __n,
 166                          __locale_t __l) __THROW __nonnull ((2, 4));
 167 #endif
 168
 169 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED \
 170     || defined __USE_XOPEN2K8
 171 /* Duplicate S, returning an identical malloc'd string.  */
 172 extern char *strdup (const char *__s)
 173      __THROW __attribute_malloc__ __nonnull ((1));
 174 #endif
 175
 176 /* Return a malloc'd copy of at most N bytes of STRING.  The
 177    resultant string is terminated even if no null terminator
 178    appears before STRING[N].  */
 179 #if defined __USE_XOPEN2K8
 180 extern char *strndup (const char *__string, size_t __n)
 181      __THROW __attribute_malloc__ __nonnull ((1));
 182 #endif
 183
 184 #if defined __USE_GNU && defined __GNUC__
 185 /* Duplicate S, returning an identical alloca'd string.  */
 186 # define strdupa(s)                                                           \
 187   (__extension__                                                              \
 188     ({                                                                        \
 189       const char *__old = (s);                                                \
 190       size_t __len = strlen (__old) + 1;                                      \
 191       char *__new = (char *) __builtin_alloca (__len);                        \
 192       (char *) memcpy (__new, __old, __len);                                  \
 193     }))
 194
 195 /* Return an alloca'd copy of at most N bytes of string.  */
 196 # define strndupa(s, n)                                                       \
 197   (__extension__                                                              \
 198     ({                                                                        \
 199       const char *__old = (s);                                                \
 200       size_t __len = strnlen (__old, (n));                                    \
 201       char *__new = (char *) __builtin_alloca (__len + 1);                    \
 202       __new[__len] = '\0';                                                    \
 203       (char *) memcpy (__new, __old, __len);                                  \
 204     }))
 205 #endif
 206
 207 __BEGIN_NAMESPACE_STD
 208 /* Find the first occurrence of C in S.  */
 209 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 210 extern "C++"
 211 {
 212 extern char *strchr (char *__s, int __c)
 213      __THROW __asm ("strchr") __attribute_pure__ __nonnull ((1));
 214 extern const char *strchr (const char *__s, int __c)
 215      __THROW __asm ("strchr") __attribute_pure__ __nonnull ((1));
 216
 217 # ifdef __OPTIMIZE__
 218 __extern_always_inline char *
 219 strchr (char *__s, int __c) __THROW
 220 {
 221   return __builtin_strchr (__s, __c);
 222 }
 223
 224 __extern_always_inline const char *
 225 strchr (const char *__s, int __c) __THROW
 226 {
 227   return __builtin_strchr (__s, __c);
 228 }
 229 # endif
 230 }
 231 #else
 232 extern char *strchr (const char *__s, int __c)
 233      __THROW __attribute_pure__ __nonnull ((1));
 234 #endif
 235 /* Find the last occurrence of C in S.  */
 236 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 237 extern "C++"
 238 {
 239 extern char *strrchr (char *__s, int __c)
 240      __THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1));
 241 extern const char *strrchr (const char *__s, int __c)
 242      __THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1));
 243
 244 # ifdef __OPTIMIZE__
 245 __extern_always_inline char *
 246 strrchr (char *__s, int __c) __THROW
 247 {
 248   return __builtin_strrchr (__s, __c);
 249 }
 250
 251 __extern_always_inline const char *
 252 strrchr (const char *__s, int __c) __THROW
 253 {
 254   return __builtin_strrchr (__s, __c);
 255 }
 256 # endif
 257 }
 258 #else
 259 extern char *strrchr (const char *__s, int __c)
 260      __THROW __attribute_pure__ __nonnull ((1));
 261 #endif
 262 __END_NAMESPACE_STD
 263
 264 #ifdef __USE_GNU
 265 /* This function is similar to `strchr'.  But it returns a pointer to
 266    the closing NUL byte in case C is not found in S.  */
 267 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 268 extern "C++" char *strchrnul (char *__s, int __c)
 269      __THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1));
 270 extern "C++" const char *strchrnul (const char *__s, int __c)
 271      __THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1));
 272 # else
 273 extern char *strchrnul (const char *__s, int __c)
 274      __THROW __attribute_pure__ __nonnull ((1));
 275 # endif
 276 #endif
 277
 278 __BEGIN_NAMESPACE_STD
 279 /* Return the length of the initial segment of S which
 280    consists entirely of characters not in REJECT.  */
 281 extern size_t strcspn (const char *__s, const char *__reject)
 282      __THROW __attribute_pure__ __nonnull ((1, 2));
 283 /* Return the length of the initial segment of S which
 284    consists entirely of characters in ACCEPT.  */
 285 extern size_t strspn (const char *__s, const char *__accept)
 286      __THROW __attribute_pure__ __nonnull ((1, 2));
 287 /* Find the first occurrence in S of any character in ACCEPT.  */
 288 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 289 extern "C++"
 290 {
 291 extern char *strpbrk (char *__s, const char *__accept)
 292      __THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
 293 extern const char *strpbrk (const char *__s, const char *__accept)
 294      __THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
 295
 296 # ifdef __OPTIMIZE__
 297 __extern_always_inline char *
 298 strpbrk (char *__s, const char *__accept) __THROW
 299 {
 300   return __builtin_strpbrk (__s, __accept);
 301 }
 302
 303 __extern_always_inline const char *
 304 strpbrk (const char *__s, const char *__accept) __THROW
 305 {
 306   return __builtin_strpbrk (__s, __accept);
 307 }
 308 # endif
 309 }
 310 #else
 311 extern char *strpbrk (const char *__s, const char *__accept)
 312      __THROW __attribute_pure__ __nonnull ((1, 2));
 313 #endif
 314 /* Find the first occurrence of NEEDLE in HAYSTACK.  */
 315 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 316 extern "C++"
 317 {
 318 extern char *strstr (char *__haystack, const char *__needle)
 319      __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
 320 extern const char *strstr (const char *__haystack, const char *__needle)
 321      __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
 322
 323 # ifdef __OPTIMIZE__
 324 __extern_always_inline char *
 325 strstr (char *__haystack, const char *__needle) __THROW
 326 {
 327   return __builtin_strstr (__haystack, __needle);
 328 }
 329
 330 __extern_always_inline const char *
 331 strstr (const char *__haystack, const char *__needle) __THROW
 332 {
 333   return __builtin_strstr (__haystack, __needle);
 334 }
 335 # endif
 336 }
 337 #else
 338 extern char *strstr (const char *__haystack, const char *__needle)
 339      __THROW __attribute_pure__ __nonnull ((1, 2));
 340 #endif
 341
 342
 343 /* Divide S into tokens separated by characters in DELIM.  */
 344 extern char *strtok (char *__restrict __s, const char *__restrict __delim)
 345      __THROW __nonnull ((2));
 346 __END_NAMESPACE_STD
 347
 348 /* Divide S into tokens separated by characters in DELIM.  Information
 349    passed between calls are stored in SAVE_PTR.  */
 350 extern char *__strtok_r (char *__restrict __s,
 351                          const char *__restrict __delim,
 352                          char **__restrict __save_ptr)
 353      __THROW __nonnull ((2, 3));
 354 #if defined __USE_POSIX || defined __USE_MISC
 355 extern char *strtok_r (char *__restrict __s, const char *__restrict __delim,
 356                        char **__restrict __save_ptr)
 357      __THROW __nonnull ((2, 3));
 358 #endif
 359
 360 #ifdef __USE_GNU
 361 /* Similar to `strstr' but this function ignores the case of both strings.  */
 362 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 363 extern "C++" char *strcasestr (char *__haystack, const char *__needle)
 364      __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
 365 extern "C++" const char *strcasestr (const char *__haystack,
 366                                      const char *__needle)
 367      __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
 368 # else
 369 extern char *strcasestr (const char *__haystack, const char *__needle)
 370      __THROW __attribute_pure__ __nonnull ((1, 2));
 371 # endif
 372 #endif
 373
 374 #ifdef __USE_GNU
 375 /* Find the first occurrence of NEEDLE in HAYSTACK.
 376    NEEDLE is NEEDLELEN bytes long;
 377    HAYSTACK is HAYSTACKLEN bytes long.  */
 378 extern void *memmem (const void *__haystack, size_t __haystacklen,
 379                      const void *__needle, size_t __needlelen)
 380      __THROW __attribute_pure__ __nonnull ((1, 3));
 381
 382 /* Copy N bytes of SRC to DEST, return pointer to bytes after the
 383    last written byte.  */
 384 extern void *__mempcpy (void *__restrict __dest,
 385                         const void *__restrict __src, size_t __n)
 386      __THROW __nonnull ((1, 2));
 387 extern void *mempcpy (void *__restrict __dest,
 388                       const void *__restrict __src, size_t __n)
 389      __THROW __nonnull ((1, 2));
 390 #endif
 391
 392
 393 __BEGIN_NAMESPACE_STD
 394 /* Return the length of S.  */
 395 extern size_t strlen (const char *__s)
 396      __THROW __attribute_pure__ __nonnull ((1));
 397 __END_NAMESPACE_STD
 398
 399 #ifdef  __USE_XOPEN2K8
 400 /* Find the length of STRING, but scan at most MAXLEN characters.
 401    If no '\0' terminator is found in that many characters, return MAXLEN.  */
 402 extern size_t strnlen (const char *__string, size_t __maxlen)
 403      __THROW __attribute_pure__ __nonnull ((1));
 404 #endif
 405
 406
 407 __BEGIN_NAMESPACE_STD
 408 /* Return a string describing the meaning of the `errno' code in ERRNUM.  */
 409 extern char *strerror (int __errnum) __THROW;
 410 __END_NAMESPACE_STD
 411 #if defined __USE_XOPEN2K || defined __USE_MISC
 412 /* Reentrant version of `strerror'.
 413    There are 2 flavors of `strerror_r', GNU which returns the string
 414    and may or may not use the supplied temporary buffer and POSIX one
 415    which fills the string into the buffer.
 416    To use the POSIX version, -D_XOPEN_SOURCE=600 or -D_POSIX_C_SOURCE=200112L
 417    without -D_GNU_SOURCE is needed, otherwise the GNU version is
 418    preferred.  */
 419 # if defined __USE_XOPEN2K && !defined __USE_GNU
 420 /* Fill BUF with a string describing the meaning of the `errno' code in
 421    ERRNUM.  */
 422 #  ifdef __REDIRECT_NTH
 423 extern int __REDIRECT_NTH (strerror_r,
 424                            (int __errnum, char *__buf, size_t __buflen),
 425                            __xpg_strerror_r) __nonnull ((2));
 426 #  else
 427 extern int __xpg_strerror_r (int __errnum, char *__buf, size_t __buflen)
 428      __THROW __nonnull ((2));
 429 #   define strerror_r __xpg_strerror_r
 430 #  endif
 431 # else
 432 /* If a temporary buffer is required, at most BUFLEN bytes of BUF will be
 433    used.  */
 434 extern char *strerror_r (int __errnum, char *__buf, size_t __buflen)
 435      __THROW __nonnull ((2)) __wur;
 436 # endif
 437 #endif
 438
 439 #ifdef __USE_XOPEN2K8
 440 /* Translate error number to string according to the locale L.  */
 441 extern char *strerror_l (int __errnum, __locale_t __l) __THROW;
 442 #endif
 443
 444
 445 /* We define this function always since `bzero' is sometimes needed when
 446    the namespace rules does not allow this.  */
 447 extern void __bzero (void *__s, size_t __n) __THROW __nonnull ((1));
 448
 449 #ifdef __USE_BSD
 450 /* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
 451 extern void bcopy (const void *__src, void *__dest, size_t __n)
 452      __THROW __nonnull ((1, 2));
 453
 454 /* Set N bytes of S to 0.  */
 455 extern void bzero (void *__s, size_t __n) __THROW __nonnull ((1));
 456
 457 /* Compare N bytes of S1 and S2 (same as memcmp).  */
 458 extern int bcmp (const void *__s1, const void *__s2, size_t __n)
 459      __THROW __attribute_pure__ __nonnull ((1, 2));
 460
 461 /* Find the first occurrence of C in S (same as strchr).  */
 462 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 463 extern "C++"
 464 {
 465 extern char *index (char *__s, int __c)
 466      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
 467 extern const char *index (const char *__s, int __c)
 468      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
 469
 470 #  if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO
 471 __extern_always_inline char *
 472 index (char *__s, int __c) __THROW
 473 {
 474   return __builtin_index (__s, __c);
 475 }
 476
 477 __extern_always_inline const char *
 478 index (const char *__s, int __c) __THROW
 479 {
 480   return __builtin_index (__s, __c);
 481 }
 482 #  endif
 483 }
 484 # else
 485 extern char *index (const char *__s, int __c)
 486      __THROW __attribute_pure__ __nonnull ((1));
 487 # endif
 488
 489 /* Find the last occurrence of C in S (same as strrchr).  */
 490 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 491 extern "C++"
 492 {
 493 extern char *rindex (char *__s, int __c)
 494      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
 495 extern const char *rindex (const char *__s, int __c)
 496      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
 497
 498 #  if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO
 499 __extern_always_inline char *
 500 rindex (char *__s, int __c) __THROW
 501 {
 502   return __builtin_rindex (__s, __c);
 503 }
 504
 505 __extern_always_inline const char *
 506 rindex (const char *__s, int __c) __THROW
 507 {
 508   return __builtin_rindex (__s, __c);
 509 }
 510 #endif
 511 }
 512 # else
 513 extern char *rindex (const char *__s, int __c)
 514      __THROW __attribute_pure__ __nonnull ((1));
 515 # endif
 516
 517 /* Return the position of the first bit set in I, or 0 if none are set.
 518    The least-significant bit is position 1, the most-significant 32.  */
 519 extern int ffs (int __i) __THROW __attribute__ ((__const__));
 520
 521 /* The following two functions are non-standard but necessary for non-32 bit
 522    platforms.  */
 523 # ifdef __USE_GNU
 524 extern int ffsl (long int __l) __THROW __attribute__ ((__const__));
 525 __extension__ extern int ffsll (long long int __ll)
 526      __THROW __attribute__ ((__const__));
 527 # endif
 528
 529 /* Compare S1 and S2, ignoring case.  */
 530 extern int strcasecmp (const char *__s1, const char *__s2)
 531      __THROW __attribute_pure__ __nonnull ((1, 2));
 532
 533 /* Compare no more than N chars of S1 and S2, ignoring case.  */
 534 extern int strncasecmp (const char *__s1, const char *__s2, size_t __n)
 535      __THROW __attribute_pure__ __nonnull ((1, 2));
 536 #endif /* Use BSD.  */
 537
 538 #ifdef  __USE_GNU
 539 /* Again versions of a few functions which use the given locale instead
 540    of the global one.  */
 541 extern int strcasecmp_l (const char *__s1, const char *__s2,
 542                          __locale_t __loc)
 543      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 544
 545 extern int strncasecmp_l (const char *__s1, const char *__s2,
 546                           size_t __n, __locale_t __loc)
 547      __THROW __attribute_pure__ __nonnull ((1, 2, 4));
 548 #endif
 549
 550 #ifdef  __USE_BSD
 551 /* Return the next DELIM-delimited token from *STRINGP,
 552    terminating it with a '\0', and update *STRINGP to point past it.  */
 553 extern char *strsep (char **__restrict __stringp,
 554                      const char *__restrict __delim)
 555      __THROW __nonnull ((1, 2));
 556 #endif
 557
 558 #ifdef  __USE_XOPEN2K8
 559 /* Return a string describing the meaning of the signal number in SIG.  */
 560 extern char *strsignal (int __sig) __THROW;
 561
 562 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST.  */
 563 extern char *__stpcpy (char *__restrict __dest, const char *__restrict __src)
 564      __THROW __nonnull ((1, 2));
 565 extern char *stpcpy (char *__restrict __dest, const char *__restrict __src)
 566      __THROW __nonnull ((1, 2));
 567
 568 /* Copy no more than N characters of SRC to DEST, returning the address of
 569    the last character written into DEST.  */
 570 extern char *__stpncpy (char *__restrict __dest,
 571                         const char *__restrict __src, size_t __n)
 572      __THROW __nonnull ((1, 2));
 573 extern char *stpncpy (char *__restrict __dest,
 574                       const char *__restrict __src, size_t __n)
 575      __THROW __nonnull ((1, 2));
 576 #endif
 577
 578 #ifdef  __USE_GNU
 579 /* Compare S1 and S2 as strings holding name & indices/version numbers.  */
 580 extern int strverscmp (const char *__s1, const char *__s2)
 581      __THROW __attribute_pure__ __nonnull ((1, 2));
 582
 583 /* Sautee STRING briskly.  */
 584 extern char *strfry (char *__string) __THROW __nonnull ((1));
 585
 586 /* Frobnicate N bytes of S.  */
 587 extern void *memfrob (void *__s, size_t __n) __THROW __nonnull ((1));
 588
 589 # ifndef basename
 590 /* Return the file name within directory of FILENAME.  We don't
 591    declare the function if the `basename' macro is available (defined
 592    in <libgen.h>) which makes the XPG version of this function
 593    available.  */
 594 #  ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 595 extern "C++" char *basename (char *__filename)
 596      __THROW __asm ("basename") __nonnull ((1));
 597 extern "C++" const char *basename (const char *__filename)
 598      __THROW __asm ("basename") __nonnull ((1));
 599 #  else
 600 extern char *basename (const char *__filename) __THROW __nonnull ((1));
 601 #  endif
 602 # endif
 603 #endif
 604
 605
 606 #if defined __GNUC__ && __GNUC__ >= 2
 607 # if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ \
 608      && !defined __NO_INLINE__ && !defined __cplusplus
 609 /* When using GNU CC we provide some optimized versions of selected
 610    functions from this header.  There are two kinds of optimizations:
 611
 612    - machine-dependent optimizations, most probably using inline
 613      assembler code; these might be quite expensive since the code
 614      size can increase significantly.
 615      These optimizations are not used unless the symbol
 616         __USE_STRING_INLINES
 617      is defined before including this header.
 618
 619    - machine-independent optimizations which do not increase the
 620      code size significantly and which optimize mainly situations
 621      where one or more arguments are compile-time constants.
 622      These optimizations are used always when the compiler is
 623      taught to optimize.
 624
 625    One can inhibit all optimizations by defining __NO_STRING_INLINES.  */
 626
 627 /* Get the machine-dependent optimizations (if any).  */
 628 #  include <bits/string.h>
 629
 630 /* These are generic optimizations which do not add too much inline code.  */
 631 #  include <bits/string2.h>
 632 # endif
 633
 634 # if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
 635 /* Functions with security checks.  */
 636 #  include <bits/string3.h>
 637 # endif
 638 #endif
 639
 640 __END_DECLS
 641
 642 #endif /* string.h  */