string/string.h

   1 /* Copyright (C) 1991-2016 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_MISC || 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 /* Misc || X/Open.  */
  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_XOPEN_EXTENDED || defined __USE_XOPEN2K8
 170 /* Duplicate S, returning an identical malloc'd string.  */
 171 extern char *strdup (const char *__s)
 172      __THROW __attribute_malloc__ __nonnull ((1));
 173 #endif
 174
 175 /* Return a malloc'd copy of at most N bytes of STRING.  The
 176    resultant string is terminated even if no null terminator
 177    appears before STRING[N].  */
 178 #if defined __USE_XOPEN2K8
 179 extern char *strndup (const char *__string, size_t __n)
 180      __THROW __attribute_malloc__ __nonnull ((1));
 181 #endif
 182
 183 #if defined __USE_GNU && defined __GNUC__
 184 /* Duplicate S, returning an identical alloca'd string.  */
 185 # define strdupa(s)                                                           \
 186   (__extension__                                                              \
 187     ({                                                                        \
 188       const char *__old = (s);                                                \
 189       size_t __len = strlen (__old) + 1;                                      \
 190       char *__new = (char *) __builtin_alloca (__len);                        \
 191       (char *) memcpy (__new, __old, __len);                                  \
 192     }))
 193
 194 /* Return an alloca'd copy of at most N bytes of string.  */
 195 # define strndupa(s, n)                                                       \
 196   (__extension__                                                              \
 197     ({                                                                        \
 198       const char *__old = (s);                                                \
 199       size_t __len = strnlen (__old, (n));                                    \
 200       char *__new = (char *) __builtin_alloca (__len + 1);                    \
 201       __new[__len] = '\0';                                                    \
 202       (char *) memcpy (__new, __old, __len);                                  \
 203     }))
 204 #endif
 205
 206 __BEGIN_NAMESPACE_STD
 207 /* Find the first occurrence of C in S.  */
 208 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 209 extern "C++"
 210 {
 211 extern char *strchr (char *__s, int __c)
 212      __THROW __asm ("strchr") __attribute_pure__ __nonnull ((1));
 213 extern const char *strchr (const char *__s, int __c)
 214      __THROW __asm ("strchr") __attribute_pure__ __nonnull ((1));
 215
 216 # ifdef __OPTIMIZE__
 217 __extern_always_inline char *
 218 strchr (char *__s, int __c) __THROW
 219 {
 220   return __builtin_strchr (__s, __c);
 221 }
 222
 223 __extern_always_inline const char *
 224 strchr (const char *__s, int __c) __THROW
 225 {
 226   return __builtin_strchr (__s, __c);
 227 }
 228 # endif
 229 }
 230 #else
 231 extern char *strchr (const char *__s, int __c)
 232      __THROW __attribute_pure__ __nonnull ((1));
 233 #endif
 234 /* Find the last occurrence of C in S.  */
 235 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 236 extern "C++"
 237 {
 238 extern char *strrchr (char *__s, int __c)
 239      __THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1));
 240 extern const char *strrchr (const char *__s, int __c)
 241      __THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1));
 242
 243 # ifdef __OPTIMIZE__
 244 __extern_always_inline char *
 245 strrchr (char *__s, int __c) __THROW
 246 {
 247   return __builtin_strrchr (__s, __c);
 248 }
 249
 250 __extern_always_inline const char *
 251 strrchr (const char *__s, int __c) __THROW
 252 {
 253   return __builtin_strrchr (__s, __c);
 254 }
 255 # endif
 256 }
 257 #else
 258 extern char *strrchr (const char *__s, int __c)
 259      __THROW __attribute_pure__ __nonnull ((1));
 260 #endif
 261 __END_NAMESPACE_STD
 262
 263 #ifdef __USE_GNU
 264 /* This function is similar to `strchr'.  But it returns a pointer to
 265    the closing NUL byte in case C is not found in S.  */
 266 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 267 extern "C++" char *strchrnul (char *__s, int __c)
 268      __THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1));
 269 extern "C++" const char *strchrnul (const char *__s, int __c)
 270      __THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1));
 271 # else
 272 extern char *strchrnul (const char *__s, int __c)
 273      __THROW __attribute_pure__ __nonnull ((1));
 274 # endif
 275 #endif
 276
 277 __BEGIN_NAMESPACE_STD
 278 /* Return the length of the initial segment of S which
 279    consists entirely of characters not in REJECT.  */
 280 extern size_t strcspn (const char *__s, const char *__reject)
 281      __THROW __attribute_pure__ __nonnull ((1, 2));
 282 /* Return the length of the initial segment of S which
 283    consists entirely of characters in ACCEPT.  */
 284 extern size_t strspn (const char *__s, const char *__accept)
 285      __THROW __attribute_pure__ __nonnull ((1, 2));
 286 /* Find the first occurrence in S of any character in ACCEPT.  */
 287 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 288 extern "C++"
 289 {
 290 extern char *strpbrk (char *__s, const char *__accept)
 291      __THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
 292 extern const char *strpbrk (const char *__s, const char *__accept)
 293      __THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
 294
 295 # ifdef __OPTIMIZE__
 296 __extern_always_inline char *
 297 strpbrk (char *__s, const char *__accept) __THROW
 298 {
 299   return __builtin_strpbrk (__s, __accept);
 300 }
 301
 302 __extern_always_inline const char *
 303 strpbrk (const char *__s, const char *__accept) __THROW
 304 {
 305   return __builtin_strpbrk (__s, __accept);
 306 }
 307 # endif
 308 }
 309 #else
 310 extern char *strpbrk (const char *__s, const char *__accept)
 311      __THROW __attribute_pure__ __nonnull ((1, 2));
 312 #endif
 313 /* Find the first occurrence of NEEDLE in HAYSTACK.  */
 314 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 315 extern "C++"
 316 {
 317 extern char *strstr (char *__haystack, const char *__needle)
 318      __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
 319 extern const char *strstr (const char *__haystack, const char *__needle)
 320      __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
 321
 322 # ifdef __OPTIMIZE__
 323 __extern_always_inline char *
 324 strstr (char *__haystack, const char *__needle) __THROW
 325 {
 326   return __builtin_strstr (__haystack, __needle);
 327 }
 328
 329 __extern_always_inline const char *
 330 strstr (const char *__haystack, const char *__needle) __THROW
 331 {
 332   return __builtin_strstr (__haystack, __needle);
 333 }
 334 # endif
 335 }
 336 #else
 337 extern char *strstr (const char *__haystack, const char *__needle)
 338      __THROW __attribute_pure__ __nonnull ((1, 2));
 339 #endif
 340
 341
 342 /* Divide S into tokens separated by characters in DELIM.  */
 343 extern char *strtok (char *__restrict __s, const char *__restrict __delim)
 344      __THROW __nonnull ((2));
 345 __END_NAMESPACE_STD
 346
 347 /* Divide S into tokens separated by characters in DELIM.  Information
 348    passed between calls are stored in SAVE_PTR.  */
 349 extern char *__strtok_r (char *__restrict __s,
 350                          const char *__restrict __delim,
 351                          char **__restrict __save_ptr)
 352      __THROW __nonnull ((2, 3));
 353 #ifdef __USE_POSIX
 354 extern char *strtok_r (char *__restrict __s, const char *__restrict __delim,
 355                        char **__restrict __save_ptr)
 356      __THROW __nonnull ((2, 3));
 357 #endif
 358
 359 #ifdef __USE_GNU
 360 /* Similar to `strstr' but this function ignores the case of both strings.  */
 361 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 362 extern "C++" char *strcasestr (char *__haystack, const char *__needle)
 363      __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
 364 extern "C++" const char *strcasestr (const char *__haystack,
 365                                      const char *__needle)
 366      __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
 367 # else
 368 extern char *strcasestr (const char *__haystack, const char *__needle)
 369      __THROW __attribute_pure__ __nonnull ((1, 2));
 370 # endif
 371 #endif
 372
 373 #ifdef __USE_GNU
 374 /* Find the first occurrence of NEEDLE in HAYSTACK.
 375    NEEDLE is NEEDLELEN bytes long;
 376    HAYSTACK is HAYSTACKLEN bytes long.  */
 377 extern void *memmem (const void *__haystack, size_t __haystacklen,
 378                      const void *__needle, size_t __needlelen)
 379      __THROW __attribute_pure__ __nonnull ((1, 3));
 380
 381 /* Copy N bytes of SRC to DEST, return pointer to bytes after the
 382    last written byte.  */
 383 extern void *__mempcpy (void *__restrict __dest,
 384                         const void *__restrict __src, size_t __n)
 385      __THROW __nonnull ((1, 2));
 386 extern void *mempcpy (void *__restrict __dest,
 387                       const void *__restrict __src, size_t __n)
 388      __THROW __nonnull ((1, 2));
 389 #endif
 390
 391
 392 __BEGIN_NAMESPACE_STD
 393 /* Return the length of S.  */
 394 extern size_t strlen (const char *__s)
 395      __THROW __attribute_pure__ __nonnull ((1));
 396 __END_NAMESPACE_STD
 397
 398 #ifdef  __USE_XOPEN2K8
 399 /* Find the length of STRING, but scan at most MAXLEN characters.
 400    If no '\0' terminator is found in that many characters, return MAXLEN.  */
 401 extern size_t strnlen (const char *__string, size_t __maxlen)
 402      __THROW __attribute_pure__ __nonnull ((1));
 403 #endif
 404
 405
 406 __BEGIN_NAMESPACE_STD
 407 /* Return a string describing the meaning of the `errno' code in ERRNUM.  */
 408 extern char *strerror (int __errnum) __THROW;
 409 __END_NAMESPACE_STD
 410 #ifdef __USE_XOPEN2K
 411 /* Reentrant version of `strerror'.
 412    There are 2 flavors of `strerror_r', GNU which returns the string
 413    and may or may not use the supplied temporary buffer and POSIX one
 414    which fills the string into the buffer.
 415    To use the POSIX version, -D_XOPEN_SOURCE=600 or -D_POSIX_C_SOURCE=200112L
 416    without -D_GNU_SOURCE is needed, otherwise the GNU version is
 417    preferred.  */
 418 # if defined __USE_XOPEN2K && !defined __USE_GNU
 419 /* Fill BUF with a string describing the meaning of the `errno' code in
 420    ERRNUM.  */
 421 #  ifdef __REDIRECT_NTH
 422 extern int __REDIRECT_NTH (strerror_r,
 423                            (int __errnum, char *__buf, size_t __buflen),
 424                            __xpg_strerror_r) __nonnull ((2));
 425 #  else
 426 extern int __xpg_strerror_r (int __errnum, char *__buf, size_t __buflen)
 427      __THROW __nonnull ((2));
 428 #   define strerror_r __xpg_strerror_r
 429 #  endif
 430 # else
 431 /* If a temporary buffer is required, at most BUFLEN bytes of BUF will be
 432    used.  */
 433 extern char *strerror_r (int __errnum, char *__buf, size_t __buflen)
 434      __THROW __nonnull ((2)) __wur;
 435 # endif
 436 #endif
 437
 438 #ifdef __USE_XOPEN2K8
 439 /* Translate error number to string according to the locale L.  */
 440 extern char *strerror_l (int __errnum, __locale_t __l) __THROW;
 441 #endif
 442
 443
 444 /* We define this function always since `bzero' is sometimes needed when
 445    the namespace rules does not allow this.  */
 446 extern void __bzero (void *__s, size_t __n) __THROW __nonnull ((1));
 447
 448 #ifdef __USE_MISC
 449 /* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
 450 extern void bcopy (const void *__src, void *__dest, size_t __n)
 451      __THROW __nonnull ((1, 2));
 452
 453 /* Set N bytes of S to 0.  */
 454 extern void bzero (void *__s, size_t __n) __THROW __nonnull ((1));
 455
 456 /* Compare N bytes of S1 and S2 (same as memcmp).  */
 457 extern int bcmp (const void *__s1, const void *__s2, size_t __n)
 458      __THROW __attribute_pure__ __nonnull ((1, 2));
 459
 460 /* Find the first occurrence of C in S (same as strchr).  */
 461 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 462 extern "C++"
 463 {
 464 extern char *index (char *__s, int __c)
 465      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
 466 extern const char *index (const char *__s, int __c)
 467      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
 468
 469 #  if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO
 470 __extern_always_inline char *
 471 index (char *__s, int __c) __THROW
 472 {
 473   return __builtin_index (__s, __c);
 474 }
 475
 476 __extern_always_inline const char *
 477 index (const char *__s, int __c) __THROW
 478 {
 479   return __builtin_index (__s, __c);
 480 }
 481 #  endif
 482 }
 483 # else
 484 extern char *index (const char *__s, int __c)
 485      __THROW __attribute_pure__ __nonnull ((1));
 486 # endif
 487
 488 /* Find the last occurrence of C in S (same as strrchr).  */
 489 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 490 extern "C++"
 491 {
 492 extern char *rindex (char *__s, int __c)
 493      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
 494 extern const char *rindex (const char *__s, int __c)
 495      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
 496
 497 #  if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO
 498 __extern_always_inline char *
 499 rindex (char *__s, int __c) __THROW
 500 {
 501   return __builtin_rindex (__s, __c);
 502 }
 503
 504 __extern_always_inline const char *
 505 rindex (const char *__s, int __c) __THROW
 506 {
 507   return __builtin_rindex (__s, __c);
 508 }
 509 #endif
 510 }
 511 # else
 512 extern char *rindex (const char *__s, int __c)
 513      __THROW __attribute_pure__ __nonnull ((1));
 514 # endif
 515
 516 /* Return the position of the first bit set in I, or 0 if none are set.
 517    The least-significant bit is position 1, the most-significant 32.  */
 518 extern int ffs (int __i) __THROW __attribute__ ((__const__));
 519
 520 /* The following two functions are non-standard but necessary for non-32 bit
 521    platforms.  */
 522 # ifdef __USE_GNU
 523 extern int ffsl (long int __l) __THROW __attribute__ ((__const__));
 524 __extension__ extern int ffsll (long long int __ll)
 525      __THROW __attribute__ ((__const__));
 526 # endif
 527
 528 /* Compare S1 and S2, ignoring case.  */
 529 extern int strcasecmp (const char *__s1, const char *__s2)
 530      __THROW __attribute_pure__ __nonnull ((1, 2));
 531
 532 /* Compare no more than N chars of S1 and S2, ignoring case.  */
 533 extern int strncasecmp (const char *__s1, const char *__s2, size_t __n)
 534      __THROW __attribute_pure__ __nonnull ((1, 2));
 535 #endif /* Use misc.  */
 536
 537 #ifdef  __USE_GNU
 538 /* Again versions of a few functions which use the given locale instead
 539    of the global one.  */
 540 extern int strcasecmp_l (const char *__s1, const char *__s2,
 541                          __locale_t __loc)
 542      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 543
 544 extern int strncasecmp_l (const char *__s1, const char *__s2,
 545                           size_t __n, __locale_t __loc)
 546      __THROW __attribute_pure__ __nonnull ((1, 2, 4));
 547 #endif
 548
 549 #ifdef  __USE_MISC
 550 /* Return the next DELIM-delimited token from *STRINGP,
 551    terminating it with a '\0', and update *STRINGP to point past it.  */
 552 extern char *strsep (char **__restrict __stringp,
 553                      const char *__restrict __delim)
 554      __THROW __nonnull ((1, 2));
 555 #endif
 556
 557 #ifdef  __USE_XOPEN2K8
 558 /* Return a string describing the meaning of the signal number in SIG.  */
 559 extern char *strsignal (int __sig) __THROW;
 560
 561 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST.  */
 562 extern char *__stpcpy (char *__restrict __dest, const char *__restrict __src)
 563      __THROW __nonnull ((1, 2));
 564 extern char *stpcpy (char *__restrict __dest, const char *__restrict __src)
 565      __THROW __nonnull ((1, 2));
 566
 567 /* Copy no more than N characters of SRC to DEST, returning the address of
 568    the last character written into DEST.  */
 569 extern char *__stpncpy (char *__restrict __dest,
 570                         const char *__restrict __src, size_t __n)
 571      __THROW __nonnull ((1, 2));
 572 extern char *stpncpy (char *__restrict __dest,
 573                       const char *__restrict __src, size_t __n)
 574      __THROW __nonnull ((1, 2));
 575 #endif
 576
 577 #ifdef  __USE_GNU
 578 /* Compare S1 and S2 as strings holding name & indices/version numbers.  */
 579 extern int strverscmp (const char *__s1, const char *__s2)
 580      __THROW __attribute_pure__ __nonnull ((1, 2));
 581
 582 /* Sautee STRING briskly.  */
 583 extern char *strfry (char *__string) __THROW __nonnull ((1));
 584
 585 /* Frobnicate N bytes of S.  */
 586 extern void *memfrob (void *__s, size_t __n) __THROW __nonnull ((1));
 587
 588 # ifndef basename
 589 /* Return the file name within directory of FILENAME.  We don't
 590    declare the function if the `basename' macro is available (defined
 591    in <libgen.h>) which makes the XPG version of this function
 592    available.  */
 593 #  ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 594 extern "C++" char *basename (char *__filename)
 595      __THROW __asm ("basename") __nonnull ((1));
 596 extern "C++" const char *basename (const char *__filename)
 597      __THROW __asm ("basename") __nonnull ((1));
 598 #  else
 599 extern char *basename (const char *__filename) __THROW __nonnull ((1));
 600 #  endif
 601 # endif
 602 #endif
 603
 604
 605 #if __GNUC_PREREQ (3,4)
 606 # if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ \
 607      && !defined __NO_INLINE__ && !defined __cplusplus
 608 /* When using GNU CC we provide some optimized versions of selected
 609    functions from this header.  There are two kinds of optimizations:
 610
 611    - machine-dependent optimizations, most probably using inline
 612      assembler code; these might be quite expensive since the code
 613      size can increase significantly.
 614      These optimizations are not used unless the symbol
 615         __USE_STRING_INLINES
 616      is defined before including this header.
 617
 618    - machine-independent optimizations which do not increase the
 619      code size significantly and which optimize mainly situations
 620      where one or more arguments are compile-time constants.
 621      These optimizations are used always when the compiler is
 622      taught to optimize.
 623
 624    One can inhibit all optimizations by defining __NO_STRING_INLINES.  */
 625
 626 /* Get the machine-dependent optimizations (if any).  */
 627 #  include <bits/string.h>
 628
 629 /* These are generic optimizations which do not add too much inline code.  */
 630 #  include <bits/string2.h>
 631 # endif
 632
 633 # if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
 634 /* Functions with security checks.  */
 635 #  include <bits/string3.h>
 636 # endif
 637 #endif
 638
 639 #if defined __USE_GNU && defined __OPTIMIZE__ \
 640     && defined __extern_always_inline && __GNUC_PREREQ (3,2)
 641 # if !defined _FORCE_INLINES && !defined _HAVE_STRING_ARCH_mempcpy
 642
 643 #define mempcpy(dest, src, n) __mempcpy_inline (dest, src, n)
 644 #define __mempcpy(dest, src, n) __mempcpy_inline (dest, src, n)
 645
 646 __extern_always_inline void *
 647 __mempcpy_inline (void *__restrict __dest,
 648                   const void *__restrict __src, size_t __n)
 649 {
 650   return (char *) memcpy (__dest, __src, __n) + __n;
 651 }
 652
 653 # endif
 654 #endif
 655
 656 __END_DECLS
 657
 658 #endif /* string.h  */