1 /* Copyright (C) 1991-1993,1995-2004,2007,2009 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, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 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, 44 __const void *__restrict __src, size_t __n) 45 __THROW __nonnull ((1, 2)); 46 /* Copy N bytes of SRC to DEST, guaranteeing 47 correct behavior for overlapping strings. */ 48 extern void *memmove (void *__dest, __const void *__src, size_t __n) 49 __THROW __nonnull ((1, 2)); 50 __END_NAMESPACE_STD 51 52 /* Copy no more than N bytes of SRC to DEST, stopping when C is found. 53 Return the position in DEST one byte past where C was copied, 54 or NULL if C was not found in the first N bytes of SRC. */ 55 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN 56 extern void *memccpy (void *__restrict __dest, __const void *__restrict __src, 57 int __c, size_t __n) 58 __THROW __nonnull ((1, 2)); 59 #endif /* SVID. */ 60 61 62 __BEGIN_NAMESPACE_STD 63 /* Set N bytes of S to C. */ 64 extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1)); 65 66 /* Compare N bytes of S1 and S2. */ 67 extern int memcmp (__const void *__s1, __const void *__s2, size_t __n) 68 __THROW __attribute_pure__ __nonnull ((1, 2)); 69 70 /* Search N bytes of S for C. */ 71 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 72 extern "C++" 73 { 74 extern void *memchr (void *__s, int __c, size_t __n) 75 __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1)); 76 extern __const void *memchr (__const void *__s, int __c, size_t __n) 77 __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1)); 78 79 # ifdef __OPTIMIZE__ 80 __extern_always_inline void * 81 memchr (void *__s, int __c, size_t __n) __THROW 82 { 83 return __builtin_memchr (__s, __c, __n); 84 } 85 86 __extern_always_inline __const void * 87 memchr (__const void *__s, int __c, size_t __n) __THROW 88 { 89 return __builtin_memchr (__s, __c, __n); 90 } 91 # endif 92 } 93 #else 94 extern void *memchr (__const void *__s, int __c, size_t __n) 95 __THROW __attribute_pure__ __nonnull ((1)); 96 #endif 97 __END_NAMESPACE_STD 98 99 #ifdef __USE_GNU 100 /* Search in S for C. This is similar to `memchr' but there is no 101 length limit. */ 102 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 103 extern "C++" void *rawmemchr (void *__s, int __c) 104 __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1)); 105 extern "C++" __const void *rawmemchr (__const void *__s, int __c) 106 __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1)); 107 # else 108 extern void *rawmemchr (__const void *__s, int __c) 109 __THROW __attribute_pure__ __nonnull ((1)); 110 # endif 111 112 /* Search N bytes of S for the final occurrence of C. */ 113 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 114 extern "C++" void *memrchr (void *__s, int __c, size_t __n) 115 __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1)); 116 extern "C++" __const void *memrchr (__const void *__s, int __c, size_t __n) 117 __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1)); 118 # else 119 extern void *memrchr (__const void *__s, int __c, size_t __n) 120 __THROW __attribute_pure__ __nonnull ((1)); 121 # endif 122 #endif 123 124 125 __BEGIN_NAMESPACE_STD 126 /* Copy SRC to DEST. */ 127 extern char *strcpy (char *__restrict __dest, __const char *__restrict __src) 128 __THROW __nonnull ((1, 2)); 129 /* Copy no more than N characters of SRC to DEST. */ 130 extern char *strncpy (char *__restrict __dest, 131 __const char *__restrict __src, size_t __n) 132 __THROW __nonnull ((1, 2)); 133 134 /* Append SRC onto DEST. */ 135 extern char *strcat (char *__restrict __dest, __const char *__restrict __src) 136 __THROW __nonnull ((1, 2)); 137 /* Append no more than N characters from SRC onto DEST. */ 138 extern char *strncat (char *__restrict __dest, __const char *__restrict __src, 139 size_t __n) __THROW __nonnull ((1, 2)); 140 141 /* Compare S1 and S2. */ 142 extern int strcmp (__const char *__s1, __const char *__s2) 143 __THROW __attribute_pure__ __nonnull ((1, 2)); 144 /* Compare N characters of S1 and S2. */ 145 extern int strncmp (__const char *__s1, __const char *__s2, size_t __n) 146 __THROW __attribute_pure__ __nonnull ((1, 2)); 147 148 /* Compare the collated forms of S1 and S2. */ 149 extern int strcoll (__const char *__s1, __const char *__s2) 150 __THROW __attribute_pure__ __nonnull ((1, 2)); 151 /* Put a transformation of SRC into no more than N bytes of DEST. */ 152 extern size_t strxfrm (char *__restrict __dest, 153 __const char *__restrict __src, size_t __n) 154 __THROW __nonnull ((2)); 155 __END_NAMESPACE_STD 156 157 #ifdef __USE_XOPEN2K8 158 /* The following functions are equivalent to the both above but they 159 take the locale they use for the collation as an extra argument. 160 This is not standardsized but something like will come. */ 161 # include <xlocale.h> 162 163 /* Compare the collated forms of S1 and S2 using rules from L. */ 164 extern int strcoll_l (__const char *__s1, __const char *__s2, __locale_t __l) 165 __THROW __attribute_pure__ __nonnull ((1, 2, 3)); 166 /* Put a transformation of SRC into no more than N bytes of DEST. */ 167 extern size_t strxfrm_l (char *__dest, __const char *__src, size_t __n, 168 __locale_t __l) __THROW __nonnull ((2, 4)); 169 #endif 170 171 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED 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, 322 __const char *__needle) 323 __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2)); 324 325 # ifdef __OPTIMIZE__ 326 __extern_always_inline char * 327 strstr (char *__haystack, __const char *__needle) __THROW 328 { 329 return __builtin_strstr (__haystack, __needle); 330 } 331 332 __extern_always_inline __const char * 333 strstr (__const char *__haystack, __const char *__needle) __THROW 334 { 335 return __builtin_strstr (__haystack, __needle); 336 } 337 # endif 338 } 339 #else 340 extern char *strstr (__const char *__haystack, __const char *__needle) 341 __THROW __attribute_pure__ __nonnull ((1, 2)); 342 #endif 343 344 345 /* Divide S into tokens separated by characters in DELIM. */ 346 extern char *strtok (char *__restrict __s, __const char *__restrict __delim) 347 __THROW __nonnull ((2)); 348 __END_NAMESPACE_STD 349 350 /* Divide S into tokens separated by characters in DELIM. Information 351 passed between calls are stored in SAVE_PTR. */ 352 extern char *__strtok_r (char *__restrict __s, 353 __const char *__restrict __delim, 354 char **__restrict __save_ptr) 355 __THROW __nonnull ((2, 3)); 356 #if defined __USE_POSIX || defined __USE_MISC 357 extern char *strtok_r (char *__restrict __s, __const char *__restrict __delim, 358 char **__restrict __save_ptr) 359 __THROW __nonnull ((2, 3)); 360 #endif 361 362 #ifdef __USE_GNU 363 /* Similar to `strstr' but this function ignores the case of both strings. */ 364 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 365 extern "C++" char *strcasestr (char *__haystack, __const char *__needle) 366 __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2)); 367 extern "C++" __const char *strcasestr (__const char *__haystack, 368 __const char *__needle) 369 __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2)); 370 # else 371 extern char *strcasestr (__const char *__haystack, __const char *__needle) 372 __THROW __attribute_pure__ __nonnull ((1, 2)); 373 # endif 374 #endif 375 376 #ifdef __USE_GNU 377 /* Find the first occurrence of NEEDLE in HAYSTACK. 378 NEEDLE is NEEDLELEN bytes long; 379 HAYSTACK is HAYSTACKLEN bytes long. */ 380 extern void *memmem (__const void *__haystack, size_t __haystacklen, 381 __const void *__needle, size_t __needlelen) 382 __THROW __attribute_pure__ __nonnull ((1, 3)); 383 384 /* Copy N bytes of SRC to DEST, return pointer to bytes after the 385 last written byte. */ 386 extern void *__mempcpy (void *__restrict __dest, 387 __const void *__restrict __src, size_t __n) 388 __THROW __nonnull ((1, 2)); 389 extern void *mempcpy (void *__restrict __dest, 390 __const void *__restrict __src, size_t __n) 391 __THROW __nonnull ((1, 2)); 392 #endif 393 394 395 __BEGIN_NAMESPACE_STD 396 /* Return the length of S. */ 397 extern size_t strlen (__const char *__s) 398 __THROW __attribute_pure__ __nonnull ((1)); 399 __END_NAMESPACE_STD 400 401 #ifdef __USE_XOPEN2K8 402 /* Find the length of STRING, but scan at most MAXLEN characters. 403 If no '\0' terminator is found in that many characters, return MAXLEN. */ 404 extern size_t strnlen (__const char *__string, size_t __maxlen) 405 __THROW __attribute_pure__ __nonnull ((1)); 406 #endif 407 408 409 __BEGIN_NAMESPACE_STD 410 /* Return a string describing the meaning of the `errno' code in ERRNUM. */ 411 extern char *strerror (int __errnum) __THROW; 412 __END_NAMESPACE_STD 413 #if defined __USE_XOPEN2K || defined __USE_MISC 414 /* Reentrant version of `strerror'. 415 There are 2 flavors of `strerror_r', GNU which returns the string 416 and may or may not use the supplied temporary buffer and POSIX one 417 which fills the string into the buffer. 418 To use the POSIX version, -D_XOPEN_SOURCE=600 or -D_POSIX_C_SOURCE=200112L 419 without -D_GNU_SOURCE is needed, otherwise the GNU version is 420 preferred. */ 421 # if defined __USE_XOPEN2K && !defined __USE_GNU 422 /* Fill BUF with a string describing the meaning of the `errno' code in 423 ERRNUM. */ 424 # ifdef __REDIRECT_NTH 425 extern int __REDIRECT_NTH (strerror_r, 426 (int __errnum, char *__buf, size_t __buflen), 427 __xpg_strerror_r) __nonnull ((2)); 428 # else 429 extern int __xpg_strerror_r (int __errnum, char *__buf, size_t __buflen) 430 __THROW __nonnull ((2)); 431 # define strerror_r __xpg_strerror_r 432 # endif 433 # else 434 /* If a temporary buffer is required, at most BUFLEN bytes of BUF will be 435 used. */ 436 extern char *strerror_r (int __errnum, char *__buf, size_t __buflen) 437 __THROW __nonnull ((2)); 438 # endif 439 #endif 440 441 #ifdef __USE_XOPEN2K8 442 /* Translate error number to string according to the locale L. */ 443 extern char *strerror_l (int __errnum, __locale_t __l) __THROW; 444 #endif 445 446 447 /* We define this function always since `bzero' is sometimes needed when 448 the namespace rules does not allow this. */ 449 extern void __bzero (void *__s, size_t __n) __THROW __nonnull ((1)); 450 451 #ifdef __USE_BSD 452 /* Copy N bytes of SRC to DEST (like memmove, but args reversed). */ 453 extern void bcopy (__const void *__src, void *__dest, size_t __n) 454 __THROW __nonnull ((1, 2)); 455 456 /* Set N bytes of S to 0. */ 457 extern void bzero (void *__s, size_t __n) __THROW __nonnull ((1)); 458 459 /* Compare N bytes of S1 and S2 (same as memcmp). */ 460 extern int bcmp (__const void *__s1, __const void *__s2, size_t __n) 461 __THROW __attribute_pure__ __nonnull ((1, 2)); 462 463 /* Find the first occurrence of C in S (same as strchr). */ 464 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 465 extern "C++" 466 { 467 extern char *index (char *__s, int __c) 468 __THROW __asm ("index") __attribute_pure__ __nonnull ((1)); 469 extern __const char *index (__const char *__s, int __c) 470 __THROW __asm ("index") __attribute_pure__ __nonnull ((1)); 471 472 # if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO 473 __extern_always_inline char * 474 index (char *__s, int __c) __THROW 475 { 476 return __builtin_index (__s, __c); 477 } 478 479 __extern_always_inline __const char * 480 index (__const char *__s, int __c) __THROW 481 { 482 return __builtin_index (__s, __c); 483 } 484 # endif 485 } 486 # else 487 extern char *index (__const char *__s, int __c) 488 __THROW __attribute_pure__ __nonnull ((1)); 489 # endif 490 491 /* Find the last occurrence of C in S (same as strrchr). */ 492 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 493 extern "C++" 494 { 495 extern char *rindex (char *__s, int __c) 496 __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1)); 497 extern __const char *rindex (__const char *__s, int __c) 498 __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1)); 499 500 # if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO 501 __extern_always_inline char * 502 rindex (char *__s, int __c) __THROW 503 { 504 return __builtin_rindex (__s, __c); 505 } 506 507 __extern_always_inline __const char * 508 rindex (__const char *__s, int __c) __THROW 509 { 510 return __builtin_rindex (__s, __c); 511 } 512 #endif 513 } 514 # else 515 extern char *rindex (__const char *__s, int __c) 516 __THROW __attribute_pure__ __nonnull ((1)); 517 # endif 518 519 /* Return the position of the first bit set in I, or 0 if none are set. 520 The least-significant bit is position 1, the most-significant 32. */ 521 extern int ffs (int __i) __THROW __attribute__ ((__const__)); 522 523 /* The following two functions are non-standard but necessary for non-32 bit 524 platforms. */ 525 # ifdef __USE_GNU 526 extern int ffsl (long int __l) __THROW __attribute__ ((__const__)); 527 # ifdef __GNUC__ 528 __extension__ extern int ffsll (long long int __ll) 529 __THROW __attribute__ ((__const__)); 530 # endif 531 # endif 532 533 /* Compare S1 and S2, ignoring case. */ 534 extern int strcasecmp (__const char *__s1, __const char *__s2) 535 __THROW __attribute_pure__ __nonnull ((1, 2)); 536 537 /* Compare no more than N chars of S1 and S2, ignoring case. */ 538 extern int strncasecmp (__const char *__s1, __const char *__s2, size_t __n) 539 __THROW __attribute_pure__ __nonnull ((1, 2)); 540 #endif /* Use BSD. */ 541 542 #ifdef __USE_GNU 543 /* Again versions of a few functions which use the given locale instead 544 of the global one. */ 545 extern int strcasecmp_l (__const char *__s1, __const char *__s2, 546 __locale_t __loc) 547 __THROW __attribute_pure__ __nonnull ((1, 2, 3)); 548 549 extern int strncasecmp_l (__const char *__s1, __const char *__s2, 550 size_t __n, __locale_t __loc) 551 __THROW __attribute_pure__ __nonnull ((1, 2, 4)); 552 #endif 553 554 #ifdef __USE_BSD 555 /* Return the next DELIM-delimited token from *STRINGP, 556 terminating it with a '\0', and update *STRINGP to point past it. */ 557 extern char *strsep (char **__restrict __stringp, 558 __const char *__restrict __delim) 559 __THROW __nonnull ((1, 2)); 560 #endif 561 562 #ifdef __USE_XOPEN2K8 563 /* Return a string describing the meaning of the signal number in SIG. */ 564 extern char *strsignal (int __sig) __THROW; 565 566 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST. */ 567 extern char *__stpcpy (char *__restrict __dest, __const char *__restrict __src) 568 __THROW __nonnull ((1, 2)); 569 extern char *stpcpy (char *__restrict __dest, __const char *__restrict __src) 570 __THROW __nonnull ((1, 2)); 571 572 /* Copy no more than N characters of SRC to DEST, returning the address of 573 the last character written into DEST. */ 574 extern char *__stpncpy (char *__restrict __dest, 575 __const char *__restrict __src, size_t __n) 576 __THROW __nonnull ((1, 2)); 577 extern char *stpncpy (char *__restrict __dest, 578 __const char *__restrict __src, size_t __n) 579 __THROW __nonnull ((1, 2)); 580 #endif 581 582 #ifdef __USE_GNU 583 /* Compare S1 and S2 as strings holding name & indices/version numbers. */ 584 extern int strverscmp (__const char *__s1, __const char *__s2) 585 __THROW __attribute_pure__ __nonnull ((1, 2)); 586 587 /* Sautee STRING briskly. */ 588 extern char *strfry (char *__string) __THROW __nonnull ((1)); 589 590 /* Frobnicate N bytes of S. */ 591 extern void *memfrob (void *__s, size_t __n) __THROW __nonnull ((1)); 592 593 # ifndef basename 594 /* Return the file name within directory of FILENAME. We don't 595 declare the function if the `basename' macro is available (defined 596 in <libgen.h>) which makes the XPG version of this function 597 available. */ 598 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 599 extern "C++" char *basename (char *__filename) 600 __THROW __asm ("basename") __nonnull ((1)); 601 extern "C++" __const char *basename (__const char *__filename) 602 __THROW __asm ("basename") __nonnull ((1)); 603 # else 604 extern char *basename (__const char *__filename) __THROW __nonnull ((1)); 605 # endif 606 # endif 607 #endif 608 609 610 #if defined __GNUC__ && __GNUC__ >= 2 611 # if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ \ 612 && !defined __NO_INLINE__ && !defined __cplusplus 613 /* When using GNU CC we provide some optimized versions of selected 614 functions from this header. There are two kinds of optimizations: 615 616 - machine-dependent optimizations, most probably using inline 617 assembler code; these might be quite expensive since the code 618 size can increase significantly. 619 These optimizations are not used unless the symbol 620 __USE_STRING_INLINES 621 is defined before including this header. 622 623 - machine-independent optimizations which do not increase the 624 code size significantly and which optimize mainly situations 625 where one or more arguments are compile-time constants. 626 These optimizations are used always when the compiler is 627 taught to optimize. 628 629 One can inhibit all optimizations by defining __NO_STRING_INLINES. */ 630 631 /* Get the machine-dependent optimizations (if any). */ 632 # include <bits/string.h> 633 634 /* These are generic optimizations which do not add too much inline code. */ 635 # include <bits/string2.h> 636 # endif 637 638 # if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline 639 /* Functions with security checks. */ 640 # include <bits/string3.h> 641 # endif 642 #endif 643 644 __END_DECLS 645 646 #endif /* string.h */ 647
