1 /* Copyright (C) 1991-1993,1995-2004,2007,2009,2010 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, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 /* 21 * ISO C99 Standard: 7.21 String handling <string.h> 22 */ 23 24 #ifndef _STRING_H 25 #define _STRING_H 1 26 27 #include <features.h> 28 29 __BEGIN_DECLS 30 31 /* Get size_t and NULL from <stddef.h>. */ 32 #define __need_size_t 33 #define __need_NULL 34 #include <stddef.h> 35 36 /* Tell the caller that we provide correct C++ prototypes. */ 37 #if defined __cplusplus && __GNUC_PREREQ (4, 4) 38 # define __CORRECT_ISO_CPP_STRING_H_PROTO 39 #endif 40 41 42 __BEGIN_NAMESPACE_STD 43 /* Copy N bytes of SRC to DEST. */ 44 extern void *memcpy (void *__restrict __dest, 45 __const void *__restrict __src, size_t __n) 46 __THROW __nonnull ((1, 2)); 47 /* Copy N bytes of SRC to DEST, guaranteeing 48 correct behavior for overlapping strings. */ 49 extern void *memmove (void *__dest, __const void *__src, size_t __n) 50 __THROW __nonnull ((1, 2)); 51 __END_NAMESPACE_STD 52 53 /* Copy no more than N bytes of SRC to DEST, stopping when C is found. 54 Return the position in DEST one byte past where C was copied, 55 or NULL if C was not found in the first N bytes of SRC. */ 56 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN 57 extern void *memccpy (void *__restrict __dest, __const void *__restrict __src, 58 int __c, size_t __n) 59 __THROW __nonnull ((1, 2)); 60 #endif /* SVID. */ 61 62 63 __BEGIN_NAMESPACE_STD 64 /* Set N bytes of S to C. */ 65 extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1)); 66 67 /* Compare N bytes of S1 and S2. */ 68 extern int memcmp (__const void *__s1, __const void *__s2, size_t __n) 69 __THROW __attribute_pure__ __nonnull ((1, 2)); 70 71 /* Search N bytes of S for C. */ 72 #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 73 extern "C++" 74 { 75 extern void *memchr (void *__s, int __c, size_t __n) 76 __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1)); 77 extern __const void *memchr (__const void *__s, int __c, size_t __n) 78 __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1)); 79 80 # ifdef __OPTIMIZE__ 81 __extern_always_inline void * 82 memchr (void *__s, int __c, size_t __n) __THROW 83 { 84 return __builtin_memchr (__s, __c, __n); 85 } 86 87 __extern_always_inline __const void * 88 memchr (__const void *__s, int __c, size_t __n) __THROW 89 { 90 return __builtin_memchr (__s, __c, __n); 91 } 92 # endif 93 } 94 #else 95 extern void *memchr (__const void *__s, int __c, size_t __n) 96 __THROW __attribute_pure__ __nonnull ((1)); 97 #endif 98 __END_NAMESPACE_STD 99 100 #ifdef __USE_GNU 101 /* Search in S for C. This is similar to `memchr' but there is no 102 length limit. */ 103 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 104 extern "C++" void *rawmemchr (void *__s, int __c) 105 __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1)); 106 extern "C++" __const void *rawmemchr (__const void *__s, int __c) 107 __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1)); 108 # else 109 extern void *rawmemchr (__const void *__s, int __c) 110 __THROW __attribute_pure__ __nonnull ((1)); 111 # endif 112 113 /* Search N bytes of S for the final occurrence of C. */ 114 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 115 extern "C++" void *memrchr (void *__s, int __c, size_t __n) 116 __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1)); 117 extern "C++" __const void *memrchr (__const void *__s, int __c, size_t __n) 118 __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1)); 119 # else 120 extern void *memrchr (__const void *__s, int __c, size_t __n) 121 __THROW __attribute_pure__ __nonnull ((1)); 122 # endif 123 #endif 124 125 126 __BEGIN_NAMESPACE_STD 127 /* Copy SRC to DEST. */ 128 extern char *strcpy (char *__restrict __dest, __const char *__restrict __src) 129 __THROW __nonnull ((1, 2)); 130 /* Copy no more than N characters of SRC to DEST. */ 131 extern char *strncpy (char *__restrict __dest, 132 __const char *__restrict __src, size_t __n) 133 __THROW __nonnull ((1, 2)); 134 135 /* Append SRC onto DEST. */ 136 extern char *strcat (char *__restrict __dest, __const char *__restrict __src) 137 __THROW __nonnull ((1, 2)); 138 /* Append no more than N characters from SRC onto DEST. */ 139 extern char *strncat (char *__restrict __dest, __const char *__restrict __src, 140 size_t __n) __THROW __nonnull ((1, 2)); 141 142 /* Compare S1 and S2. */ 143 extern int strcmp (__const char *__s1, __const char *__s2) 144 __THROW __attribute_pure__ __nonnull ((1, 2)); 145 /* Compare N characters of S1 and S2. */ 146 extern int strncmp (__const char *__s1, __const char *__s2, size_t __n) 147 __THROW __attribute_pure__ __nonnull ((1, 2)); 148 149 /* Compare the collated forms of S1 and S2. */ 150 extern int strcoll (__const char *__s1, __const char *__s2) 151 __THROW __attribute_pure__ __nonnull ((1, 2)); 152 /* Put a transformation of SRC into no more than N bytes of DEST. */ 153 extern size_t strxfrm (char *__restrict __dest, 154 __const char *__restrict __src, size_t __n) 155 __THROW __nonnull ((2)); 156 __END_NAMESPACE_STD 157 158 #ifdef __USE_XOPEN2K8 159 /* The following functions are equivalent to the both above but they 160 take the locale they use for the collation as an extra argument. 161 This is not standardsized but something like will come. */ 162 # include <xlocale.h> 163 164 /* Compare the collated forms of S1 and S2 using rules from L. */ 165 extern int strcoll_l (__const char *__s1, __const char *__s2, __locale_t __l) 166 __THROW __attribute_pure__ __nonnull ((1, 2, 3)); 167 /* Put a transformation of SRC into no more than N bytes of DEST. */ 168 extern size_t strxfrm_l (char *__dest, __const char *__src, size_t __n, 169 __locale_t __l) __THROW __nonnull ((2, 4)); 170 #endif 171 172 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED \ 173 || 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, 324 __const char *__needle) 325 __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2)); 326 327 # ifdef __OPTIMIZE__ 328 __extern_always_inline char * 329 strstr (char *__haystack, __const char *__needle) __THROW 330 { 331 return __builtin_strstr (__haystack, __needle); 332 } 333 334 __extern_always_inline __const char * 335 strstr (__const char *__haystack, __const char *__needle) __THROW 336 { 337 return __builtin_strstr (__haystack, __needle); 338 } 339 # endif 340 } 341 #else 342 extern char *strstr (__const char *__haystack, __const char *__needle) 343 __THROW __attribute_pure__ __nonnull ((1, 2)); 344 #endif 345 346 347 /* Divide S into tokens separated by characters in DELIM. */ 348 extern char *strtok (char *__restrict __s, __const char *__restrict __delim) 349 __THROW __nonnull ((2)); 350 __END_NAMESPACE_STD 351 352 /* Divide S into tokens separated by characters in DELIM. Information 353 passed between calls are stored in SAVE_PTR. */ 354 extern char *__strtok_r (char *__restrict __s, 355 __const char *__restrict __delim, 356 char **__restrict __save_ptr) 357 __THROW __nonnull ((2, 3)); 358 #if defined __USE_POSIX || defined __USE_MISC 359 extern char *strtok_r (char *__restrict __s, __const char *__restrict __delim, 360 char **__restrict __save_ptr) 361 __THROW __nonnull ((2, 3)); 362 #endif 363 364 #ifdef __USE_GNU 365 /* Similar to `strstr' but this function ignores the case of both strings. */ 366 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 367 extern "C++" char *strcasestr (char *__haystack, __const char *__needle) 368 __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2)); 369 extern "C++" __const char *strcasestr (__const char *__haystack, 370 __const char *__needle) 371 __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2)); 372 # else 373 extern char *strcasestr (__const char *__haystack, __const char *__needle) 374 __THROW __attribute_pure__ __nonnull ((1, 2)); 375 # endif 376 #endif 377 378 #ifdef __USE_GNU 379 /* Find the first occurrence of NEEDLE in HAYSTACK. 380 NEEDLE is NEEDLELEN bytes long; 381 HAYSTACK is HAYSTACKLEN bytes long. */ 382 extern void *memmem (__const void *__haystack, size_t __haystacklen, 383 __const void *__needle, size_t __needlelen) 384 __THROW __attribute_pure__ __nonnull ((1, 3)); 385 386 /* Copy N bytes of SRC to DEST, return pointer to bytes after the 387 last written byte. */ 388 extern void *__mempcpy (void *__restrict __dest, 389 __const void *__restrict __src, size_t __n) 390 __THROW __nonnull ((1, 2)); 391 extern void *mempcpy (void *__restrict __dest, 392 __const void *__restrict __src, size_t __n) 393 __THROW __nonnull ((1, 2)); 394 #endif 395 396 397 __BEGIN_NAMESPACE_STD 398 /* Return the length of S. */ 399 extern size_t strlen (__const char *__s) 400 __THROW __attribute_pure__ __nonnull ((1)); 401 __END_NAMESPACE_STD 402 403 #ifdef __USE_XOPEN2K8 404 /* Find the length of STRING, but scan at most MAXLEN characters. 405 If no '\0' terminator is found in that many characters, return MAXLEN. */ 406 extern size_t strnlen (__const char *__string, size_t __maxlen) 407 __THROW __attribute_pure__ __nonnull ((1)); 408 #endif 409 410 411 __BEGIN_NAMESPACE_STD 412 /* Return a string describing the meaning of the `errno' code in ERRNUM. */ 413 extern char *strerror (int __errnum) __THROW; 414 __END_NAMESPACE_STD 415 #if defined __USE_XOPEN2K || defined __USE_MISC 416 /* Reentrant version of `strerror'. 417 There are 2 flavors of `strerror_r', GNU which returns the string 418 and may or may not use the supplied temporary buffer and POSIX one 419 which fills the string into the buffer. 420 To use the POSIX version, -D_XOPEN_SOURCE=600 or -D_POSIX_C_SOURCE=200112L 421 without -D_GNU_SOURCE is needed, otherwise the GNU version is 422 preferred. */ 423 # if defined __USE_XOPEN2K && !defined __USE_GNU 424 /* Fill BUF with a string describing the meaning of the `errno' code in 425 ERRNUM. */ 426 # ifdef __REDIRECT_NTH 427 extern int __REDIRECT_NTH (strerror_r, 428 (int __errnum, char *__buf, size_t __buflen), 429 __xpg_strerror_r) __nonnull ((2)); 430 # else 431 extern int __xpg_strerror_r (int __errnum, char *__buf, size_t __buflen) 432 __THROW __nonnull ((2)); 433 # define strerror_r __xpg_strerror_r 434 # endif 435 # else 436 /* If a temporary buffer is required, at most BUFLEN bytes of BUF will be 437 used. */ 438 extern char *strerror_r (int __errnum, char *__buf, size_t __buflen) 439 __THROW __nonnull ((2)); 440 # endif 441 #endif 442 443 #ifdef __USE_XOPEN2K8 444 /* Translate error number to string according to the locale L. */ 445 extern char *strerror_l (int __errnum, __locale_t __l) __THROW; 446 #endif 447 448 449 /* We define this function always since `bzero' is sometimes needed when 450 the namespace rules does not allow this. */ 451 extern void __bzero (void *__s, size_t __n) __THROW __nonnull ((1)); 452 453 #ifdef __USE_BSD 454 /* Copy N bytes of SRC to DEST (like memmove, but args reversed). */ 455 extern void bcopy (__const void *__src, void *__dest, size_t __n) 456 __THROW __nonnull ((1, 2)); 457 458 /* Set N bytes of S to 0. */ 459 extern void bzero (void *__s, size_t __n) __THROW __nonnull ((1)); 460 461 /* Compare N bytes of S1 and S2 (same as memcmp). */ 462 extern int bcmp (__const void *__s1, __const void *__s2, size_t __n) 463 __THROW __attribute_pure__ __nonnull ((1, 2)); 464 465 /* Find the first occurrence of C in S (same as strchr). */ 466 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 467 extern "C++" 468 { 469 extern char *index (char *__s, int __c) 470 __THROW __asm ("index") __attribute_pure__ __nonnull ((1)); 471 extern __const char *index (__const char *__s, int __c) 472 __THROW __asm ("index") __attribute_pure__ __nonnull ((1)); 473 474 # if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO 475 __extern_always_inline char * 476 index (char *__s, int __c) __THROW 477 { 478 return __builtin_index (__s, __c); 479 } 480 481 __extern_always_inline __const char * 482 index (__const char *__s, int __c) __THROW 483 { 484 return __builtin_index (__s, __c); 485 } 486 # endif 487 } 488 # else 489 extern char *index (__const char *__s, int __c) 490 __THROW __attribute_pure__ __nonnull ((1)); 491 # endif 492 493 /* Find the last occurrence of C in S (same as strrchr). */ 494 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 495 extern "C++" 496 { 497 extern char *rindex (char *__s, int __c) 498 __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1)); 499 extern __const char *rindex (__const char *__s, int __c) 500 __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1)); 501 502 # if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRINGS_H_PROTO 503 __extern_always_inline char * 504 rindex (char *__s, int __c) __THROW 505 { 506 return __builtin_rindex (__s, __c); 507 } 508 509 __extern_always_inline __const char * 510 rindex (__const char *__s, int __c) __THROW 511 { 512 return __builtin_rindex (__s, __c); 513 } 514 #endif 515 } 516 # else 517 extern char *rindex (__const char *__s, int __c) 518 __THROW __attribute_pure__ __nonnull ((1)); 519 # endif 520 521 /* Return the position of the first bit set in I, or 0 if none are set. 522 The least-significant bit is position 1, the most-significant 32. */ 523 extern int ffs (int __i) __THROW __attribute__ ((__const__)); 524 525 /* The following two functions are non-standard but necessary for non-32 bit 526 platforms. */ 527 # ifdef __USE_GNU 528 extern int ffsl (long int __l) __THROW __attribute__ ((__const__)); 529 # ifdef __GNUC__ 530 __extension__ extern int ffsll (long long int __ll) 531 __THROW __attribute__ ((__const__)); 532 # endif 533 # endif 534 535 /* Compare S1 and S2, ignoring case. */ 536 extern int strcasecmp (__const char *__s1, __const char *__s2) 537 __THROW __attribute_pure__ __nonnull ((1, 2)); 538 539 /* Compare no more than N chars of S1 and S2, ignoring case. */ 540 extern int strncasecmp (__const char *__s1, __const char *__s2, size_t __n) 541 __THROW __attribute_pure__ __nonnull ((1, 2)); 542 #endif /* Use BSD. */ 543 544 #ifdef __USE_GNU 545 /* Again versions of a few functions which use the given locale instead 546 of the global one. */ 547 extern int strcasecmp_l (__const char *__s1, __const char *__s2, 548 __locale_t __loc) 549 __THROW __attribute_pure__ __nonnull ((1, 2, 3)); 550 551 extern int strncasecmp_l (__const char *__s1, __const char *__s2, 552 size_t __n, __locale_t __loc) 553 __THROW __attribute_pure__ __nonnull ((1, 2, 4)); 554 #endif 555 556 #ifdef __USE_BSD 557 /* Return the next DELIM-delimited token from *STRINGP, 558 terminating it with a '\0', and update *STRINGP to point past it. */ 559 extern char *strsep (char **__restrict __stringp, 560 __const char *__restrict __delim) 561 __THROW __nonnull ((1, 2)); 562 #endif 563 564 #ifdef __USE_XOPEN2K8 565 /* Return a string describing the meaning of the signal number in SIG. */ 566 extern char *strsignal (int __sig) __THROW; 567 568 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST. */ 569 extern char *__stpcpy (char *__restrict __dest, __const char *__restrict __src) 570 __THROW __nonnull ((1, 2)); 571 extern char *stpcpy (char *__restrict __dest, __const char *__restrict __src) 572 __THROW __nonnull ((1, 2)); 573 574 /* Copy no more than N characters of SRC to DEST, returning the address of 575 the last character written into DEST. */ 576 extern char *__stpncpy (char *__restrict __dest, 577 __const char *__restrict __src, size_t __n) 578 __THROW __nonnull ((1, 2)); 579 extern char *stpncpy (char *__restrict __dest, 580 __const char *__restrict __src, size_t __n) 581 __THROW __nonnull ((1, 2)); 582 #endif 583 584 #ifdef __USE_GNU 585 /* Compare S1 and S2 as strings holding name & indices/version numbers. */ 586 extern int strverscmp (__const char *__s1, __const char *__s2) 587 __THROW __attribute_pure__ __nonnull ((1, 2)); 588 589 /* Sautee STRING briskly. */ 590 extern char *strfry (char *__string) __THROW __nonnull ((1)); 591 592 /* Frobnicate N bytes of S. */ 593 extern void *memfrob (void *__s, size_t __n) __THROW __nonnull ((1)); 594 595 # ifndef basename 596 /* Return the file name within directory of FILENAME. We don't 597 declare the function if the `basename' macro is available (defined 598 in <libgen.h>) which makes the XPG version of this function 599 available. */ 600 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO 601 extern "C++" char *basename (char *__filename) 602 __THROW __asm ("basename") __nonnull ((1)); 603 extern "C++" __const char *basename (__const char *__filename) 604 __THROW __asm ("basename") __nonnull ((1)); 605 # else 606 extern char *basename (__const char *__filename) __THROW __nonnull ((1)); 607 # endif 608 # endif 609 #endif 610 611 612 #if defined __GNUC__ && __GNUC__ >= 2 613 # if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ \ 614 && !defined __NO_INLINE__ && !defined __cplusplus 615 /* When using GNU CC we provide some optimized versions of selected 616 functions from this header. There are two kinds of optimizations: 617 618 - machine-dependent optimizations, most probably using inline 619 assembler code; these might be quite expensive since the code 620 size can increase significantly. 621 These optimizations are not used unless the symbol 622 __USE_STRING_INLINES 623 is defined before including this header. 624 625 - machine-independent optimizations which do not increase the 626 code size significantly and which optimize mainly situations 627 where one or more arguments are compile-time constants. 628 These optimizations are used always when the compiler is 629 taught to optimize. 630 631 One can inhibit all optimizations by defining __NO_STRING_INLINES. */ 632 633 /* Get the machine-dependent optimizations (if any). */ 634 # include <bits/string.h> 635 636 /* These are generic optimizations which do not add too much inline code. */ 637 # include <bits/string2.h> 638 # endif 639 640 # if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline 641 /* Functions with security checks. */ 642 # include <bits/string3.h> 643 # endif 644 #endif 645 646 __END_DECLS 647 648 #endif /* string.h */ 649
