string/string.h

   1 /* Copyright (C) 1991-2017 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 #define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
  26 #include <bits/libc-header-start.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, const void *__restrict __src,
  44                      size_t __n) __THROW __nonnull ((1, 2));
  45 /* Copy N bytes of SRC to DEST, guaranteeing
  46    correct behavior for overlapping strings.  */
  47 extern void *memmove (void *__dest, const void *__src, size_t __n)
  48      __THROW __nonnull ((1, 2));
  49 __END_NAMESPACE_STD
  50
  51 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
  52    Return the position in DEST one byte past where C was copied,
  53    or NULL if C was not found in the first N bytes of SRC.  */
  54 #if defined __USE_MISC || defined __USE_XOPEN
  55 extern void *memccpy (void *__restrict __dest, const void *__restrict __src,
  56                       int __c, size_t __n)
  57      __THROW __nonnull ((1, 2));
  58 #endif /* Misc || X/Open.  */
  59
  60
  61 __BEGIN_NAMESPACE_STD
  62 /* Set N bytes of S to C.  */
  63 extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
  64
  65 /* Compare N bytes of S1 and S2.  */
  66 extern int memcmp (const void *__s1, const void *__s2, size_t __n)
  67      __THROW __attribute_pure__ __nonnull ((1, 2));
  68
  69 /* Search N bytes of S for C.  */
  70 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
  71 extern "C++"
  72 {
  73 extern void *memchr (void *__s, int __c, size_t __n)
  74       __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1));
  75 extern const void *memchr (const void *__s, int __c, size_t __n)
  76       __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1));
  77
  78 # ifdef __OPTIMIZE__
  79 __extern_always_inline void *
  80 memchr (void *__s, int __c, size_t __n) __THROW
  81 {
  82   return __builtin_memchr (__s, __c, __n);
  83 }
  84
  85 __extern_always_inline const void *
  86 memchr (const void *__s, int __c, size_t __n) __THROW
  87 {
  88   return __builtin_memchr (__s, __c, __n);
  89 }
  90 # endif
  91 }
  92 #else
  93 extern void *memchr (const void *__s, int __c, size_t __n)
  94       __THROW __attribute_pure__ __nonnull ((1));
  95 #endif
  96 __END_NAMESPACE_STD
  97
  98 #ifdef __USE_GNU
  99 /* Search in S for C.  This is similar to `memchr' but there is no
 100    length limit.  */
 101 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 102 extern "C++" void *rawmemchr (void *__s, int __c)
 103      __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1));
 104 extern "C++" const void *rawmemchr (const void *__s, int __c)
 105      __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1));
 106 # else
 107 extern void *rawmemchr (const void *__s, int __c)
 108      __THROW __attribute_pure__ __nonnull ((1));
 109 # endif
 110
 111 /* Search N bytes of S for the final occurrence of C.  */
 112 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 113 extern "C++" void *memrchr (void *__s, int __c, size_t __n)
 114       __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1));
 115 extern "C++" const void *memrchr (const void *__s, int __c, size_t __n)
 116       __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1));
 117 # else
 118 extern void *memrchr (const void *__s, int __c, size_t __n)
 119       __THROW __attribute_pure__ __nonnull ((1));
 120 # endif
 121 #endif
 122
 123
 124 __BEGIN_NAMESPACE_STD
 125 /* Copy SRC to DEST.  */
 126 extern char *strcpy (char *__restrict __dest, const char *__restrict __src)
 127      __THROW __nonnull ((1, 2));
 128 /* Copy no more than N characters of SRC to DEST.  */
 129 extern char *strncpy (char *__restrict __dest,
 130                       const char *__restrict __src, size_t __n)
 131      __THROW __nonnull ((1, 2));
 132
 133 /* Append SRC onto DEST.  */
 134 extern char *strcat (char *__restrict __dest, const char *__restrict __src)
 135      __THROW __nonnull ((1, 2));
 136 /* Append no more than N characters from SRC onto DEST.  */
 137 extern char *strncat (char *__restrict __dest, const char *__restrict __src,
 138                       size_t __n) __THROW __nonnull ((1, 2));
 139
 140 /* Compare S1 and S2.  */
 141 extern int strcmp (const char *__s1, const char *__s2)
 142      __THROW __attribute_pure__ __nonnull ((1, 2));
 143 /* Compare N characters of S1 and S2.  */
 144 extern int strncmp (const char *__s1, const char *__s2, size_t __n)
 145      __THROW __attribute_pure__ __nonnull ((1, 2));
 146
 147 /* Compare the collated forms of S1 and S2.  */
 148 extern int strcoll (const char *__s1, const char *__s2)
 149      __THROW __attribute_pure__ __nonnull ((1, 2));
 150 /* Put a transformation of SRC into no more than N bytes of DEST.  */
 151 extern size_t strxfrm (char *__restrict __dest,
 152                        const char *__restrict __src, size_t __n)
 153      __THROW __nonnull ((2));
 154 __END_NAMESPACE_STD
 155
 156 #ifdef __USE_XOPEN2K8
 157 # include <xlocale.h>
 158
 159 /* Compare the collated forms of S1 and S2, using sorting rules from L.  */
 160 extern int strcoll_l (const char *__s1, const char *__s2, __locale_t __l)
 161      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 162 /* Put a transformation of SRC into no more than N bytes of DEST,
 163    using sorting rules from L.  */
 164 extern size_t strxfrm_l (char *__dest, const char *__src, size_t __n,
 165                          __locale_t __l) __THROW __nonnull ((2, 4));
 166 #endif
 167
 168 #if (defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8     \
 169      || __GLIBC_USE (LIB_EXT2))
 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 || __GLIBC_USE (LIB_EXT2)
 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 /* As bzero, but the compiler will not delete a call to this
 457    function, even if S is dead after the call.  */
 458 extern void explicit_bzero (void *__s, size_t __n) __THROW __nonnull ((1));
 459
 460 /* Compare N bytes of S1 and S2 (same as memcmp).  */
 461 extern int bcmp (const void *__s1, const void *__s2, size_t __n)
 462      __THROW __attribute_pure__ __nonnull ((1, 2));
 463
 464 /* Find the first occurrence of C in S (same as strchr).  */
 465 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 466 extern "C++"
 467 {
 468 extern char *index (char *__s, int __c)
 469      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
 470 extern const char *index (const char *__s, int __c)
 471      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
 472
 473 #  if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO
 474 __extern_always_inline char *
 475 index (char *__s, int __c) __THROW
 476 {
 477   return __builtin_index (__s, __c);
 478 }
 479
 480 __extern_always_inline const char *
 481 index (const char *__s, int __c) __THROW
 482 {
 483   return __builtin_index (__s, __c);
 484 }
 485 #  endif
 486 }
 487 # else
 488 extern char *index (const char *__s, int __c)
 489      __THROW __attribute_pure__ __nonnull ((1));
 490 # endif
 491
 492 /* Find the last occurrence of C in S (same as strrchr).  */
 493 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 494 extern "C++"
 495 {
 496 extern char *rindex (char *__s, int __c)
 497      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
 498 extern const char *rindex (const char *__s, int __c)
 499      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
 500
 501 #  if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO
 502 __extern_always_inline char *
 503 rindex (char *__s, int __c) __THROW
 504 {
 505   return __builtin_rindex (__s, __c);
 506 }
 507
 508 __extern_always_inline const char *
 509 rindex (const char *__s, int __c) __THROW
 510 {
 511   return __builtin_rindex (__s, __c);
 512 }
 513 #endif
 514 }
 515 # else
 516 extern char *rindex (const char *__s, int __c)
 517      __THROW __attribute_pure__ __nonnull ((1));
 518 # endif
 519
 520 /* Return the position of the first bit set in I, or 0 if none are set.
 521    The least-significant bit is position 1, the most-significant 32.  */
 522 extern int ffs (int __i) __THROW __attribute__ ((__const__));
 523
 524 /* The following two functions are non-standard but necessary for non-32 bit
 525    platforms.  */
 526 # ifdef __USE_GNU
 527 extern int ffsl (long int __l) __THROW __attribute__ ((__const__));
 528 __extension__ extern int ffsll (long long int __ll)
 529      __THROW __attribute__ ((__const__));
 530 # endif
 531
 532 /* Compare S1 and S2, ignoring case.  */
 533 extern int strcasecmp (const char *__s1, const char *__s2)
 534      __THROW __attribute_pure__ __nonnull ((1, 2));
 535
 536 /* Compare no more than N chars of S1 and S2, ignoring case.  */
 537 extern int strncasecmp (const char *__s1, const char *__s2, size_t __n)
 538      __THROW __attribute_pure__ __nonnull ((1, 2));
 539 #endif /* Use misc.  */
 540
 541 #ifdef  __USE_GNU
 542 /* Again versions of a few functions which use the given locale instead
 543    of the global one.  */
 544 extern int strcasecmp_l (const char *__s1, const char *__s2,
 545                          __locale_t __loc)
 546      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 547
 548 extern int strncasecmp_l (const char *__s1, const char *__s2,
 549                           size_t __n, __locale_t __loc)
 550      __THROW __attribute_pure__ __nonnull ((1, 2, 4));
 551 #endif
 552
 553 #ifdef  __USE_MISC
 554 /* Return the next DELIM-delimited token from *STRINGP,
 555    terminating it with a '\0', and update *STRINGP to point past it.  */
 556 extern char *strsep (char **__restrict __stringp,
 557                      const char *__restrict __delim)
 558      __THROW __nonnull ((1, 2));
 559 #endif
 560
 561 #ifdef  __USE_XOPEN2K8
 562 /* Return a string describing the meaning of the signal number in SIG.  */
 563 extern char *strsignal (int __sig) __THROW;
 564
 565 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST.  */
 566 extern char *__stpcpy (char *__restrict __dest, const char *__restrict __src)
 567      __THROW __nonnull ((1, 2));
 568 extern char *stpcpy (char *__restrict __dest, const char *__restrict __src)
 569      __THROW __nonnull ((1, 2));
 570
 571 /* Copy no more than N characters of SRC to DEST, returning the address of
 572    the last character written into DEST.  */
 573 extern char *__stpncpy (char *__restrict __dest,
 574                         const char *__restrict __src, size_t __n)
 575      __THROW __nonnull ((1, 2));
 576 extern char *stpncpy (char *__restrict __dest,
 577                       const char *__restrict __src, size_t __n)
 578      __THROW __nonnull ((1, 2));
 579 #endif
 580
 581 #ifdef  __USE_GNU
 582 /* Compare S1 and S2 as strings holding name & indices/version numbers.  */
 583 extern int strverscmp (const char *__s1, const char *__s2)
 584      __THROW __attribute_pure__ __nonnull ((1, 2));
 585
 586 /* Sautee STRING briskly.  */
 587 extern char *strfry (char *__string) __THROW __nonnull ((1));
 588
 589 /* Frobnicate N bytes of S.  */
 590 extern void *memfrob (void *__s, size_t __n) __THROW __nonnull ((1));
 591
 592 # ifndef basename
 593 /* Return the file name within directory of FILENAME.  We don't
 594    declare the function if the `basename' macro is available (defined
 595    in <libgen.h>) which makes the XPG version of this function
 596    available.  */
 597 #  ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 598 extern "C++" char *basename (char *__filename)
 599      __THROW __asm ("basename") __nonnull ((1));
 600 extern "C++" const char *basename (const char *__filename)
 601      __THROW __asm ("basename") __nonnull ((1));
 602 #  else
 603 extern char *basename (const char *__filename) __THROW __nonnull ((1));
 604 #  endif
 605 # endif
 606 #endif
 607
 608
 609 #if __GNUC_PREREQ (3,4)
 610 # if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ \
 611      && !defined __NO_INLINE__ && !defined __cplusplus
 612 /* When using GNU CC we provide some optimized versions of selected
 613    functions from this header.  There are two kinds of optimizations:
 614
 615    - machine-dependent optimizations, most probably using inline
 616      assembler code; these might be quite expensive since the code
 617      size can increase significantly.
 618      These optimizations are not used unless the symbol
 619         __USE_STRING_INLINES
 620      is defined before including this header.
 621
 622    - machine-independent optimizations which do not increase the
 623      code size significantly and which optimize mainly situations
 624      where one or more arguments are compile-time constants.
 625      These optimizations are used always when the compiler is
 626      taught to optimize.
 627
 628    One can inhibit all optimizations by defining __NO_STRING_INLINES.  */
 629
 630 /* Get the machine-dependent optimizations (if any).  */
 631 #  include <bits/string.h>
 632
 633 /* These are generic optimizations which do not add too much inline code.  */
 634 #  include <bits/string2.h>
 635 # endif
 636
 637 # if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
 638 /* Functions with security checks.  */
 639 #  include <bits/string3.h>
 640 # endif
 641 #endif
 642
 643 #if defined __USE_GNU && defined __OPTIMIZE__ \
 644     && defined __extern_always_inline && __GNUC_PREREQ (3,2)
 645 # if !defined _FORCE_INLINES && !defined _HAVE_STRING_ARCH_mempcpy
 646
 647 #define mempcpy(dest, src, n) __mempcpy_inline (dest, src, n)
 648 #define __mempcpy(dest, src, n) __mempcpy_inline (dest, src, n)
 649
 650 __extern_always_inline void *
 651 __mempcpy_inline (void *__restrict __dest,
 652                   const void *__restrict __src, size_t __n)
 653 {
 654   return (char *) memcpy (__dest, __src, __n) + __n;
 655 }
 656
 657 # endif
 658 #endif
 659
 660 __END_DECLS
 661
 662 #endif /* string.h  */