string/string.h

   1 /* Copyright (C) 1991-1993,1995-2004,2007,2009,2010,2012
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  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, 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_SVID || defined __USE_BSD || 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 /* SVID.  */
  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 /* The following functions are equivalent to the both above but they
 158    take the locale they use for the collation as an extra argument.
 159    This is not standardsized but something like will come.  */
 160 # include <xlocale.h>
 161
 162 /* Compare the collated forms of S1 and S2 using rules from L.  */
 163 extern int strcoll_l (const char *__s1, const char *__s2, __locale_t __l)
 164      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 165 /* Put a transformation of SRC into no more than N bytes of DEST.  */
 166 extern size_t strxfrm_l (char *__dest, const char *__src, size_t __n,
 167                          __locale_t __l) __THROW __nonnull ((2, 4));
 168 #endif
 169
 170 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED \
 171     || defined __USE_XOPEN2K8
 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, const char *__needle)
 322      __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
 323
 324 # ifdef __OPTIMIZE__
 325 __extern_always_inline char *
 326 strstr (char *__haystack, const char *__needle) __THROW
 327 {
 328   return __builtin_strstr (__haystack, __needle);
 329 }
 330
 331 __extern_always_inline const char *
 332 strstr (const char *__haystack, const char *__needle) __THROW
 333 {
 334   return __builtin_strstr (__haystack, __needle);
 335 }
 336 # endif
 337 }
 338 #else
 339 extern char *strstr (const char *__haystack, const char *__needle)
 340      __THROW __attribute_pure__ __nonnull ((1, 2));
 341 #endif
 342
 343
 344 /* Divide S into tokens separated by characters in DELIM.  */
 345 extern char *strtok (char *__restrict __s, const char *__restrict __delim)
 346      __THROW __nonnull ((2));
 347 __END_NAMESPACE_STD
 348
 349 /* Divide S into tokens separated by characters in DELIM.  Information
 350    passed between calls are stored in SAVE_PTR.  */
 351 extern char *__strtok_r (char *__restrict __s,
 352                          const char *__restrict __delim,
 353                          char **__restrict __save_ptr)
 354      __THROW __nonnull ((2, 3));
 355 #if defined __USE_POSIX || defined __USE_MISC
 356 extern char *strtok_r (char *__restrict __s, const char *__restrict __delim,
 357                        char **__restrict __save_ptr)
 358      __THROW __nonnull ((2, 3));
 359 #endif
 360
 361 #ifdef __USE_GNU
 362 /* Similar to `strstr' but this function ignores the case of both strings.  */
 363 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 364 extern "C++" char *strcasestr (char *__haystack, const char *__needle)
 365      __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
 366 extern "C++" const char *strcasestr (const char *__haystack,
 367                                      const char *__needle)
 368      __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
 369 # else
 370 extern char *strcasestr (const char *__haystack, const char *__needle)
 371      __THROW __attribute_pure__ __nonnull ((1, 2));
 372 # endif
 373 #endif
 374
 375 #ifdef __USE_GNU
 376 /* Find the first occurrence of NEEDLE in HAYSTACK.
 377    NEEDLE is NEEDLELEN bytes long;
 378    HAYSTACK is HAYSTACKLEN bytes long.  */
 379 extern void *memmem (const void *__haystack, size_t __haystacklen,
 380                      const void *__needle, size_t __needlelen)
 381      __THROW __attribute_pure__ __nonnull ((1, 3));
 382
 383 /* Copy N bytes of SRC to DEST, return pointer to bytes after the
 384    last written byte.  */
 385 extern void *__mempcpy (void *__restrict __dest,
 386                         const void *__restrict __src, size_t __n)
 387      __THROW __nonnull ((1, 2));
 388 extern void *mempcpy (void *__restrict __dest,
 389                       const void *__restrict __src, size_t __n)
 390      __THROW __nonnull ((1, 2));
 391 #endif
 392
 393
 394 __BEGIN_NAMESPACE_STD
 395 /* Return the length of S.  */
 396 extern size_t strlen (const char *__s)
 397      __THROW __attribute_pure__ __nonnull ((1));
 398 __END_NAMESPACE_STD
 399
 400 #ifdef  __USE_XOPEN2K8
 401 /* Find the length of STRING, but scan at most MAXLEN characters.
 402    If no '\0' terminator is found in that many characters, return MAXLEN.  */
 403 extern size_t strnlen (const char *__string, size_t __maxlen)
 404      __THROW __attribute_pure__ __nonnull ((1));
 405 #endif
 406
 407
 408 __BEGIN_NAMESPACE_STD
 409 /* Return a string describing the meaning of the `errno' code in ERRNUM.  */
 410 extern char *strerror (int __errnum) __THROW;
 411 __END_NAMESPACE_STD
 412 #if defined __USE_XOPEN2K || defined __USE_MISC
 413 /* Reentrant version of `strerror'.
 414    There are 2 flavors of `strerror_r', GNU which returns the string
 415    and may or may not use the supplied temporary buffer and POSIX one
 416    which fills the string into the buffer.
 417    To use the POSIX version, -D_XOPEN_SOURCE=600 or -D_POSIX_C_SOURCE=200112L
 418    without -D_GNU_SOURCE is needed, otherwise the GNU version is
 419    preferred.  */
 420 # if defined __USE_XOPEN2K && !defined __USE_GNU
 421 /* Fill BUF with a string describing the meaning of the `errno' code in
 422    ERRNUM.  */
 423 #  ifdef __REDIRECT_NTH
 424 extern int __REDIRECT_NTH (strerror_r,
 425                            (int __errnum, char *__buf, size_t __buflen),
 426                            __xpg_strerror_r) __nonnull ((2));
 427 #  else
 428 extern int __xpg_strerror_r (int __errnum, char *__buf, size_t __buflen)
 429      __THROW __nonnull ((2));
 430 #   define strerror_r __xpg_strerror_r
 431 #  endif
 432 # else
 433 /* If a temporary buffer is required, at most BUFLEN bytes of BUF will be
 434    used.  */
 435 extern char *strerror_r (int __errnum, char *__buf, size_t __buflen)
 436      __THROW __nonnull ((2));
 437 # endif
 438 #endif
 439
 440 #ifdef __USE_XOPEN2K8
 441 /* Translate error number to string according to the locale L.  */
 442 extern char *strerror_l (int __errnum, __locale_t __l) __THROW;
 443 #endif
 444
 445
 446 /* We define this function always since `bzero' is sometimes needed when
 447    the namespace rules does not allow this.  */
 448 extern void __bzero (void *__s, size_t __n) __THROW __nonnull ((1));
 449
 450 #ifdef __USE_BSD
 451 /* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
 452 extern void bcopy (const void *__src, void *__dest, size_t __n)
 453      __THROW __nonnull ((1, 2));
 454
 455 /* Set N bytes of S to 0.  */
 456 extern void bzero (void *__s, size_t __n) __THROW __nonnull ((1));
 457
 458 /* Compare N bytes of S1 and S2 (same as memcmp).  */
 459 extern int bcmp (const void *__s1, const void *__s2, size_t __n)
 460      __THROW __attribute_pure__ __nonnull ((1, 2));
 461
 462 /* Find the first occurrence of C in S (same as strchr).  */
 463 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 464 extern "C++"
 465 {
 466 extern char *index (char *__s, int __c)
 467      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
 468 extern const char *index (const char *__s, int __c)
 469      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
 470
 471 #  if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO
 472 __extern_always_inline char *
 473 index (char *__s, int __c) __THROW
 474 {
 475   return __builtin_index (__s, __c);
 476 }
 477
 478 __extern_always_inline const char *
 479 index (const char *__s, int __c) __THROW
 480 {
 481   return __builtin_index (__s, __c);
 482 }
 483 #  endif
 484 }
 485 # else
 486 extern char *index (const char *__s, int __c)
 487      __THROW __attribute_pure__ __nonnull ((1));
 488 # endif
 489
 490 /* Find the last occurrence of C in S (same as strrchr).  */
 491 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 492 extern "C++"
 493 {
 494 extern char *rindex (char *__s, int __c)
 495      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
 496 extern const char *rindex (const char *__s, int __c)
 497      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
 498
 499 #  if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO
 500 __extern_always_inline char *
 501 rindex (char *__s, int __c) __THROW
 502 {
 503   return __builtin_rindex (__s, __c);
 504 }
 505
 506 __extern_always_inline const char *
 507 rindex (const char *__s, int __c) __THROW
 508 {
 509   return __builtin_rindex (__s, __c);
 510 }
 511 #endif
 512 }
 513 # else
 514 extern char *rindex (const char *__s, int __c)
 515      __THROW __attribute_pure__ __nonnull ((1));
 516 # endif
 517
 518 /* Return the position of the first bit set in I, or 0 if none are set.
 519    The least-significant bit is position 1, the most-significant 32.  */
 520 extern int ffs (int __i) __THROW __attribute__ ((__const__));
 521
 522 /* The following two functions are non-standard but necessary for non-32 bit
 523    platforms.  */
 524 # ifdef __USE_GNU
 525 extern int ffsl (long int __l) __THROW __attribute__ ((__const__));
 526 #  ifdef __GNUC__
 527 __extension__ extern int ffsll (long long int __ll)
 528      __THROW __attribute__ ((__const__));
 529 #  endif
 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 BSD.  */
 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_BSD
 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 defined __GNUC__ && __GNUC__ >= 2
 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 __extern_always_inline
 638 /* Functions with security checks.  */
 639 #  include <bits/string3.h>
 640 # endif
 641 #endif
 642
 643 __END_DECLS
 644
 645 #endif /* string.h  */