string/string.h

   1 /* Copyright (C) 1991-2015 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 /* Provide correct C++ prototypes, and indicate this to the caller.  This
  35    requires a compatible C++ standard library.  As a heuristic, we provide
  36    these when the compiler indicates full conformance with C++98 or later,
  37    and for older GCC versions that are known to provide a compatible
  38    libstdc++.  */
  39 #if defined __cplusplus && (__cplusplus >= 199711L || __GNUC_PREREQ (4, 4))
  40 # define __CORRECT_ISO_CPP_STRING_H_PROTO
  41 #endif
  42
  43
  44 __BEGIN_NAMESPACE_STD
  45 /* Copy N bytes of SRC to DEST.  */
  46 extern void *memcpy (void *__restrict __dest, const void *__restrict __src,
  47                      size_t __n) __THROW __nonnull ((1, 2));
  48 /* Copy N bytes of SRC to DEST, guaranteeing
  49    correct behavior for overlapping strings.  */
  50 extern void *memmove (void *__dest, const void *__src, size_t __n)
  51      __THROW __nonnull ((1, 2));
  52 __END_NAMESPACE_STD
  53
  54 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
  55    Return the position in DEST one byte past where C was copied,
  56    or NULL if C was not found in the first N bytes of SRC.  */
  57 #if defined __USE_MISC || defined __USE_XOPEN
  58 extern void *memccpy (void *__restrict __dest, const void *__restrict __src,
  59                       int __c, size_t __n)
  60      __THROW __nonnull ((1, 2));
  61 #endif /* Misc || X/Open.  */
  62
  63
  64 __BEGIN_NAMESPACE_STD
  65 /* Set N bytes of S to C.  */
  66 extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
  67
  68 /* Compare N bytes of S1 and S2.  */
  69 extern int memcmp (const void *__s1, const void *__s2, size_t __n)
  70      __THROW __attribute_pure__ __nonnull ((1, 2));
  71
  72 /* Search N bytes of S for C.  */
  73 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
  74 extern "C++"
  75 {
  76 extern void *memchr (void *__s, int __c, size_t __n)
  77       __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1));
  78 extern const void *memchr (const void *__s, int __c, size_t __n)
  79       __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1));
  80
  81 # ifdef __OPTIMIZE__
  82 __extern_always_inline void *
  83 memchr (void *__s, int __c, size_t __n) __THROW
  84 {
  85   return __builtin_memchr (__s, __c, __n);
  86 }
  87
  88 __extern_always_inline const void *
  89 memchr (const void *__s, int __c, size_t __n) __THROW
  90 {
  91   return __builtin_memchr (__s, __c, __n);
  92 }
  93 # endif
  94 }
  95 #else
  96 extern void *memchr (const void *__s, int __c, size_t __n)
  97       __THROW __attribute_pure__ __nonnull ((1));
  98 #endif
  99 __END_NAMESPACE_STD
 100
 101 #ifdef __USE_GNU
 102 /* Search in S for C.  This is similar to `memchr' but there is no
 103    length limit.  */
 104 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 105 extern "C++" void *rawmemchr (void *__s, int __c)
 106      __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1));
 107 extern "C++" const void *rawmemchr (const void *__s, int __c)
 108      __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1));
 109 # else
 110 extern void *rawmemchr (const void *__s, int __c)
 111      __THROW __attribute_pure__ __nonnull ((1));
 112 # endif
 113
 114 /* Search N bytes of S for the final occurrence of C.  */
 115 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 116 extern "C++" void *memrchr (void *__s, int __c, size_t __n)
 117       __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1));
 118 extern "C++" const void *memrchr (const void *__s, int __c, size_t __n)
 119       __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1));
 120 # else
 121 extern void *memrchr (const void *__s, int __c, size_t __n)
 122       __THROW __attribute_pure__ __nonnull ((1));
 123 # endif
 124 #endif
 125
 126
 127 __BEGIN_NAMESPACE_STD
 128 /* Copy SRC to DEST.  */
 129 extern char *strcpy (char *__restrict __dest, const char *__restrict __src)
 130      __THROW __nonnull ((1, 2));
 131 /* Copy no more than N characters of SRC to DEST.  */
 132 extern char *strncpy (char *__restrict __dest,
 133                       const char *__restrict __src, size_t __n)
 134      __THROW __nonnull ((1, 2));
 135
 136 /* Append SRC onto DEST.  */
 137 extern char *strcat (char *__restrict __dest, const char *__restrict __src)
 138      __THROW __nonnull ((1, 2));
 139 /* Append no more than N characters from SRC onto DEST.  */
 140 extern char *strncat (char *__restrict __dest, const char *__restrict __src,
 141                       size_t __n) __THROW __nonnull ((1, 2));
 142
 143 /* Compare S1 and S2.  */
 144 extern int strcmp (const char *__s1, const char *__s2)
 145      __THROW __attribute_pure__ __nonnull ((1, 2));
 146 /* Compare N characters of S1 and S2.  */
 147 extern int strncmp (const char *__s1, const char *__s2, size_t __n)
 148      __THROW __attribute_pure__ __nonnull ((1, 2));
 149
 150 /* Compare the collated forms of S1 and S2.  */
 151 extern int strcoll (const char *__s1, const char *__s2)
 152      __THROW __attribute_pure__ __nonnull ((1, 2));
 153 /* Put a transformation of SRC into no more than N bytes of DEST.  */
 154 extern size_t strxfrm (char *__restrict __dest,
 155                        const char *__restrict __src, size_t __n)
 156      __THROW __nonnull ((2));
 157 __END_NAMESPACE_STD
 158
 159 #ifdef __USE_XOPEN2K8
 160 /* The following functions are equivalent to the both above but they
 161    take the locale they use for the collation as an extra argument.
 162    This is not standardsized but something like will come.  */
 163 # include <xlocale.h>
 164
 165 /* Compare the collated forms of S1 and S2 using rules from L.  */
 166 extern int strcoll_l (const char *__s1, const char *__s2, __locale_t __l)
 167      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 168 /* Put a transformation of SRC into no more than N bytes of DEST.  */
 169 extern size_t strxfrm_l (char *__dest, const char *__src, size_t __n,
 170                          __locale_t __l) __THROW __nonnull ((2, 4));
 171 #endif
 172
 173 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
 174 /* Duplicate S, returning an identical malloc'd string.  */
 175 extern char *strdup (const char *__s)
 176      __THROW __attribute_malloc__ __nonnull ((1));
 177 #endif
 178
 179 /* Return a malloc'd copy of at most N bytes of STRING.  The
 180    resultant string is terminated even if no null terminator
 181    appears before STRING[N].  */
 182 #if defined __USE_XOPEN2K8
 183 extern char *strndup (const char *__string, size_t __n)
 184      __THROW __attribute_malloc__ __nonnull ((1));
 185 #endif
 186
 187 #if defined __USE_GNU && defined __GNUC__
 188 /* Duplicate S, returning an identical alloca'd string.  */
 189 # define strdupa(s)                                                           \
 190   (__extension__                                                              \
 191     ({                                                                        \
 192       const char *__old = (s);                                                \
 193       size_t __len = strlen (__old) + 1;                                      \
 194       char *__new = (char *) __builtin_alloca (__len);                        \
 195       (char *) memcpy (__new, __old, __len);                                  \
 196     }))
 197
 198 /* Return an alloca'd copy of at most N bytes of string.  */
 199 # define strndupa(s, n)                                                       \
 200   (__extension__                                                              \
 201     ({                                                                        \
 202       const char *__old = (s);                                                \
 203       size_t __len = strnlen (__old, (n));                                    \
 204       char *__new = (char *) __builtin_alloca (__len + 1);                    \
 205       __new[__len] = '\0';                                                    \
 206       (char *) memcpy (__new, __old, __len);                                  \
 207     }))
 208 #endif
 209
 210 __BEGIN_NAMESPACE_STD
 211 /* Find the first occurrence of C in S.  */
 212 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 213 extern "C++"
 214 {
 215 extern char *strchr (char *__s, int __c)
 216      __THROW __asm ("strchr") __attribute_pure__ __nonnull ((1));
 217 extern const char *strchr (const char *__s, int __c)
 218      __THROW __asm ("strchr") __attribute_pure__ __nonnull ((1));
 219
 220 # ifdef __OPTIMIZE__
 221 __extern_always_inline char *
 222 strchr (char *__s, int __c) __THROW
 223 {
 224   return __builtin_strchr (__s, __c);
 225 }
 226
 227 __extern_always_inline const char *
 228 strchr (const char *__s, int __c) __THROW
 229 {
 230   return __builtin_strchr (__s, __c);
 231 }
 232 # endif
 233 }
 234 #else
 235 extern char *strchr (const char *__s, int __c)
 236      __THROW __attribute_pure__ __nonnull ((1));
 237 #endif
 238 /* Find the last occurrence of C in S.  */
 239 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 240 extern "C++"
 241 {
 242 extern char *strrchr (char *__s, int __c)
 243      __THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1));
 244 extern const char *strrchr (const char *__s, int __c)
 245      __THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1));
 246
 247 # ifdef __OPTIMIZE__
 248 __extern_always_inline char *
 249 strrchr (char *__s, int __c) __THROW
 250 {
 251   return __builtin_strrchr (__s, __c);
 252 }
 253
 254 __extern_always_inline const char *
 255 strrchr (const char *__s, int __c) __THROW
 256 {
 257   return __builtin_strrchr (__s, __c);
 258 }
 259 # endif
 260 }
 261 #else
 262 extern char *strrchr (const char *__s, int __c)
 263      __THROW __attribute_pure__ __nonnull ((1));
 264 #endif
 265 __END_NAMESPACE_STD
 266
 267 #ifdef __USE_GNU
 268 /* This function is similar to `strchr'.  But it returns a pointer to
 269    the closing NUL byte in case C is not found in S.  */
 270 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 271 extern "C++" char *strchrnul (char *__s, int __c)
 272      __THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1));
 273 extern "C++" const char *strchrnul (const char *__s, int __c)
 274      __THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1));
 275 # else
 276 extern char *strchrnul (const char *__s, int __c)
 277      __THROW __attribute_pure__ __nonnull ((1));
 278 # endif
 279 #endif
 280
 281 __BEGIN_NAMESPACE_STD
 282 /* Return the length of the initial segment of S which
 283    consists entirely of characters not in REJECT.  */
 284 extern size_t strcspn (const char *__s, const char *__reject)
 285      __THROW __attribute_pure__ __nonnull ((1, 2));
 286 /* Return the length of the initial segment of S which
 287    consists entirely of characters in ACCEPT.  */
 288 extern size_t strspn (const char *__s, const char *__accept)
 289      __THROW __attribute_pure__ __nonnull ((1, 2));
 290 /* Find the first occurrence in S of any character in ACCEPT.  */
 291 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 292 extern "C++"
 293 {
 294 extern char *strpbrk (char *__s, const char *__accept)
 295      __THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
 296 extern const char *strpbrk (const char *__s, const char *__accept)
 297      __THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
 298
 299 # ifdef __OPTIMIZE__
 300 __extern_always_inline char *
 301 strpbrk (char *__s, const char *__accept) __THROW
 302 {
 303   return __builtin_strpbrk (__s, __accept);
 304 }
 305
 306 __extern_always_inline const char *
 307 strpbrk (const char *__s, const char *__accept) __THROW
 308 {
 309   return __builtin_strpbrk (__s, __accept);
 310 }
 311 # endif
 312 }
 313 #else
 314 extern char *strpbrk (const char *__s, const char *__accept)
 315      __THROW __attribute_pure__ __nonnull ((1, 2));
 316 #endif
 317 /* Find the first occurrence of NEEDLE in HAYSTACK.  */
 318 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 319 extern "C++"
 320 {
 321 extern char *strstr (char *__haystack, const char *__needle)
 322      __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
 323 extern const char *strstr (const char *__haystack, const char *__needle)
 324      __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
 325
 326 # ifdef __OPTIMIZE__
 327 __extern_always_inline char *
 328 strstr (char *__haystack, const char *__needle) __THROW
 329 {
 330   return __builtin_strstr (__haystack, __needle);
 331 }
 332
 333 __extern_always_inline const char *
 334 strstr (const char *__haystack, const char *__needle) __THROW
 335 {
 336   return __builtin_strstr (__haystack, __needle);
 337 }
 338 # endif
 339 }
 340 #else
 341 extern char *strstr (const char *__haystack, const char *__needle)
 342      __THROW __attribute_pure__ __nonnull ((1, 2));
 343 #endif
 344
 345
 346 /* Divide S into tokens separated by characters in DELIM.  */
 347 extern char *strtok (char *__restrict __s, const char *__restrict __delim)
 348      __THROW __nonnull ((2));
 349 __END_NAMESPACE_STD
 350
 351 /* Divide S into tokens separated by characters in DELIM.  Information
 352    passed between calls are stored in SAVE_PTR.  */
 353 extern char *__strtok_r (char *__restrict __s,
 354                          const char *__restrict __delim,
 355                          char **__restrict __save_ptr)
 356      __THROW __nonnull ((2, 3));
 357 #ifdef __USE_POSIX
 358 extern char *strtok_r (char *__restrict __s, const char *__restrict __delim,
 359                        char **__restrict __save_ptr)
 360      __THROW __nonnull ((2, 3));
 361 #endif
 362
 363 #ifdef __USE_GNU
 364 /* Similar to `strstr' but this function ignores the case of both strings.  */
 365 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 366 extern "C++" char *strcasestr (char *__haystack, const char *__needle)
 367      __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
 368 extern "C++" const char *strcasestr (const char *__haystack,
 369                                      const char *__needle)
 370      __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
 371 # else
 372 extern char *strcasestr (const char *__haystack, const char *__needle)
 373      __THROW __attribute_pure__ __nonnull ((1, 2));
 374 # endif
 375 #endif
 376
 377 #ifdef __USE_GNU
 378 /* Find the first occurrence of NEEDLE in HAYSTACK.
 379    NEEDLE is NEEDLELEN bytes long;
 380    HAYSTACK is HAYSTACKLEN bytes long.  */
 381 extern void *memmem (const void *__haystack, size_t __haystacklen,
 382                      const void *__needle, size_t __needlelen)
 383      __THROW __attribute_pure__ __nonnull ((1, 3));
 384
 385 /* Copy N bytes of SRC to DEST, return pointer to bytes after the
 386    last written byte.  */
 387 extern void *__mempcpy (void *__restrict __dest,
 388                         const void *__restrict __src, size_t __n)
 389      __THROW __nonnull ((1, 2));
 390 extern void *mempcpy (void *__restrict __dest,
 391                       const void *__restrict __src, size_t __n)
 392      __THROW __nonnull ((1, 2));
 393 #endif
 394
 395
 396 __BEGIN_NAMESPACE_STD
 397 /* Return the length of S.  */
 398 extern size_t strlen (const char *__s)
 399      __THROW __attribute_pure__ __nonnull ((1));
 400 __END_NAMESPACE_STD
 401
 402 #ifdef  __USE_XOPEN2K8
 403 /* Find the length of STRING, but scan at most MAXLEN characters.
 404    If no '\0' terminator is found in that many characters, return MAXLEN.  */
 405 extern size_t strnlen (const char *__string, size_t __maxlen)
 406      __THROW __attribute_pure__ __nonnull ((1));
 407 #endif
 408
 409
 410 __BEGIN_NAMESPACE_STD
 411 /* Return a string describing the meaning of the `errno' code in ERRNUM.  */
 412 extern char *strerror (int __errnum) __THROW;
 413 __END_NAMESPACE_STD
 414 #ifdef __USE_XOPEN2K
 415 /* Reentrant version of `strerror'.
 416    There are 2 flavors of `strerror_r', GNU which returns the string
 417    and may or may not use the supplied temporary buffer and POSIX one
 418    which fills the string into the buffer.
 419    To use the POSIX version, -D_XOPEN_SOURCE=600 or -D_POSIX_C_SOURCE=200112L
 420    without -D_GNU_SOURCE is needed, otherwise the GNU version is
 421    preferred.  */
 422 # if defined __USE_XOPEN2K && !defined __USE_GNU
 423 /* Fill BUF with a string describing the meaning of the `errno' code in
 424    ERRNUM.  */
 425 #  ifdef __REDIRECT_NTH
 426 extern int __REDIRECT_NTH (strerror_r,
 427                            (int __errnum, char *__buf, size_t __buflen),
 428                            __xpg_strerror_r) __nonnull ((2));
 429 #  else
 430 extern int __xpg_strerror_r (int __errnum, char *__buf, size_t __buflen)
 431      __THROW __nonnull ((2));
 432 #   define strerror_r __xpg_strerror_r
 433 #  endif
 434 # else
 435 /* If a temporary buffer is required, at most BUFLEN bytes of BUF will be
 436    used.  */
 437 extern char *strerror_r (int __errnum, char *__buf, size_t __buflen)
 438      __THROW __nonnull ((2)) __wur;
 439 # endif
 440 #endif
 441
 442 #ifdef __USE_XOPEN2K8
 443 /* Translate error number to string according to the locale L.  */
 444 extern char *strerror_l (int __errnum, __locale_t __l) __THROW;
 445 #endif
 446
 447
 448 /* We define this function always since `bzero' is sometimes needed when
 449    the namespace rules does not allow this.  */
 450 extern void __bzero (void *__s, size_t __n) __THROW __nonnull ((1));
 451
 452 #ifdef __USE_MISC
 453 /* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
 454 extern void bcopy (const void *__src, void *__dest, size_t __n)
 455      __THROW __nonnull ((1, 2));
 456
 457 /* Set N bytes of S to 0.  */
 458 extern void 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 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 __fortify_function
 638 /* Functions with security checks.  */
 639 #  include <bits/string3.h>
 640 # endif
 641 #endif
 642
 643 __END_DECLS
 644
 645 #endif /* string.h  */