gl/string.in.h

   1 /* A GNU-like <string.h>.
   2
   3    Copyright (C) 1995-1996, 2001-2008 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3, or (at your option)
   8    any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #ifndef _GL_STRING_H
  20
  21 #if __GNUC__ >= 3
  22 @PRAGMA_SYSTEM_HEADER@
  23 #endif
  24
  25 /* The include_next requires a split double-inclusion guard.  */
  26 #@INCLUDE_NEXT@ @NEXT_STRING_H@
  27
  28 #ifndef _GL_STRING_H
  29 #define _GL_STRING_H
  30
  31
  32 #ifndef __attribute__
  33 /* This feature is available in gcc versions 2.5 and later.  */
  34 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5)
  35 #  define __attribute__(Spec) /* empty */
  36 # endif
  37 /* The attribute __pure__ was added in gcc 2.96.  */
  38 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
  39 #  define __pure__ /* empty */
  40 # endif
  41 #endif
  42
  43
  44 /* The definition of GL_LINK_WARNING is copied here.  */
  45
  46
  47 #ifdef __cplusplus
  48 extern "C" {
  49 #endif
  50
  51
  52 /* Return the first occurrence of NEEDLE in HAYSTACK.  */
  53 #if @GNULIB_MEMMEM@
  54 # if @REPLACE_MEMMEM@
  55 #  define memmem rpl_memmem
  56 # endif
  57 # if ! @HAVE_DECL_MEMMEM@ || @REPLACE_MEMMEM@
  58 extern void *memmem (void const *__haystack, size_t __haystack_len,
  59                      void const *__needle, size_t __needle_len)
  60   __attribute__ ((__pure__));
  61 # endif
  62 #elif defined GNULIB_POSIXCHECK
  63 # undef memmem
  64 # define memmem(a,al,b,bl) \
  65     (GL_LINK_WARNING ("memmem is unportable and often quadratic - " \
  66                       "use gnulib module memmem-simple for portability, " \
  67                       "and module memmem for speed" ), \
  68      memmem (a, al, b, bl))
  69 #endif
  70
  71 /* Copy N bytes of SRC to DEST, return pointer to bytes after the
  72    last written byte.  */
  73 #if @GNULIB_MEMPCPY@
  74 # if ! @HAVE_MEMPCPY@
  75 extern void *mempcpy (void *restrict __dest, void const *restrict __src,
  76                       size_t __n);
  77 # endif
  78 #elif defined GNULIB_POSIXCHECK
  79 # undef mempcpy
  80 # define mempcpy(a,b,n) \
  81     (GL_LINK_WARNING ("mempcpy is unportable - " \
  82                       "use gnulib module mempcpy for portability"), \
  83      mempcpy (a, b, n))
  84 #endif
  85
  86 /* Search backwards through a block for a byte (specified as an int).  */
  87 #if @GNULIB_MEMRCHR@
  88 # if ! @HAVE_DECL_MEMRCHR@
  89 extern void *memrchr (void const *, int, size_t)
  90   __attribute__ ((__pure__));
  91 # endif
  92 #elif defined GNULIB_POSIXCHECK
  93 # undef memrchr
  94 # define memrchr(a,b,c) \
  95     (GL_LINK_WARNING ("memrchr is unportable - " \
  96                       "use gnulib module memrchr for portability"), \
  97      memrchr (a, b, c))
  98 #endif
  99
 100 /* Find the first occurrence of C in S.  More efficient than
 101    memchr(S,C,N), at the expense of undefined behavior if C does not
 102    occur within N bytes.  */
 103 #if @GNULIB_RAWMEMCHR@
 104 # if ! @HAVE_RAWMEMCHR@
 105 extern void *rawmemchr (void const *__s, int __c_in)
 106   __attribute__ ((__pure__));
 107 # endif
 108 #elif defined GNULIB_POSIXCHECK
 109 # undef rawmemchr
 110 # define rawmemchr(a,b) \
 111     (GL_LINK_WARNING ("rawmemchr is unportable - " \
 112                       "use gnulib module rawmemchr for portability"), \
 113      rawmemchr (a, b))
 114 #endif
 115
 116 /* Copy SRC to DST, returning the address of the terminating '\0' in DST.  */
 117 #if @GNULIB_STPCPY@
 118 # if ! @HAVE_STPCPY@
 119 extern char *stpcpy (char *restrict __dst, char const *restrict __src);
 120 # endif
 121 #elif defined GNULIB_POSIXCHECK
 122 # undef stpcpy
 123 # define stpcpy(a,b) \
 124     (GL_LINK_WARNING ("stpcpy is unportable - " \
 125                       "use gnulib module stpcpy for portability"), \
 126      stpcpy (a, b))
 127 #endif
 128
 129 /* Copy no more than N bytes of SRC to DST, returning a pointer past the
 130    last non-NUL byte written into DST.  */
 131 #if @GNULIB_STPNCPY@
 132 # if ! @HAVE_STPNCPY@
 133 #  define stpncpy gnu_stpncpy
 134 extern char *stpncpy (char *restrict __dst, char const *restrict __src,
 135                       size_t __n);
 136 # endif
 137 #elif defined GNULIB_POSIXCHECK
 138 # undef stpncpy
 139 # define stpncpy(a,b,n) \
 140     (GL_LINK_WARNING ("stpncpy is unportable - " \
 141                       "use gnulib module stpncpy for portability"), \
 142      stpncpy (a, b, n))
 143 #endif
 144
 145 #if defined GNULIB_POSIXCHECK
 146 /* strchr() does not work with multibyte strings if the locale encoding is
 147    GB18030 and the character to be searched is a digit.  */
 148 # undef strchr
 149 # define strchr(s,c) \
 150     (GL_LINK_WARNING ("strchr cannot work correctly on character strings " \
 151                       "in some multibyte locales - " \
 152                       "use mbschr if you care about internationalization"), \
 153      strchr (s, c))
 154 #endif
 155
 156 /* Find the first occurrence of C in S or the final NUL byte.  */
 157 #if @GNULIB_STRCHRNUL@
 158 # if ! @HAVE_STRCHRNUL@
 159 extern char *strchrnul (char const *__s, int __c_in)
 160   __attribute__ ((__pure__));
 161 # endif
 162 #elif defined GNULIB_POSIXCHECK
 163 # undef strchrnul
 164 # define strchrnul(a,b) \
 165     (GL_LINK_WARNING ("strchrnul is unportable - " \
 166                       "use gnulib module strchrnul for portability"), \
 167      strchrnul (a, b))
 168 #endif
 169
 170 /* Duplicate S, returning an identical malloc'd string.  */
 171 #if @GNULIB_STRDUP@
 172 # if @REPLACE_STRDUP@
 173 #  undef strdup
 174 #  define strdup rpl_strdup
 175 # endif
 176 # if !(@HAVE_DECL_STRDUP@ || defined strdup) || @REPLACE_STRDUP@
 177 extern char *strdup (char const *__s);
 178 # endif
 179 #elif defined GNULIB_POSIXCHECK
 180 # undef strdup
 181 # define strdup(a) \
 182     (GL_LINK_WARNING ("strdup is unportable - " \
 183                       "use gnulib module strdup for portability"), \
 184      strdup (a))
 185 #endif
 186
 187 /* Return a newly allocated copy of at most N bytes of STRING.  */
 188 #if @GNULIB_STRNDUP@
 189 # if ! @HAVE_STRNDUP@
 190 #  undef strndup
 191 #  define strndup rpl_strndup
 192 # endif
 193 # if ! @HAVE_STRNDUP@ || ! @HAVE_DECL_STRNDUP@
 194 extern char *strndup (char const *__string, size_t __n);
 195 # endif
 196 #elif defined GNULIB_POSIXCHECK
 197 # undef strndup
 198 # define strndup(a,n) \
 199     (GL_LINK_WARNING ("strndup is unportable - " \
 200                       "use gnulib module strndup for portability"), \
 201      strndup (a, n))
 202 #endif
 203
 204 /* Find the length (number of bytes) of STRING, but scan at most
 205    MAXLEN bytes.  If no '\0' terminator is found in that many bytes,
 206    return MAXLEN.  */
 207 #if @GNULIB_STRNLEN@
 208 # if ! @HAVE_DECL_STRNLEN@
 209 extern size_t strnlen (char const *__string, size_t __maxlen)
 210   __attribute__ ((__pure__));
 211 # endif
 212 #elif defined GNULIB_POSIXCHECK
 213 # undef strnlen
 214 # define strnlen(a,n) \
 215     (GL_LINK_WARNING ("strnlen is unportable - " \
 216                       "use gnulib module strnlen for portability"), \
 217      strnlen (a, n))
 218 #endif
 219
 220 #if defined GNULIB_POSIXCHECK
 221 /* strcspn() assumes the second argument is a list of single-byte characters.
 222    Even in this simple case, it does not work with multibyte strings if the
 223    locale encoding is GB18030 and one of the characters to be searched is a
 224    digit.  */
 225 # undef strcspn
 226 # define strcspn(s,a) \
 227     (GL_LINK_WARNING ("strcspn cannot work correctly on character strings " \
 228                       "in multibyte locales - " \
 229                       "use mbscspn if you care about internationalization"), \
 230      strcspn (s, a))
 231 #endif
 232
 233 /* Find the first occurrence in S of any character in ACCEPT.  */
 234 #if @GNULIB_STRPBRK@
 235 # if ! @HAVE_STRPBRK@
 236 extern char *strpbrk (char const *__s, char const *__accept)
 237   __attribute__ ((__pure__));
 238 # endif
 239 # if defined GNULIB_POSIXCHECK
 240 /* strpbrk() assumes the second argument is a list of single-byte characters.
 241    Even in this simple case, it does not work with multibyte strings if the
 242    locale encoding is GB18030 and one of the characters to be searched is a
 243    digit.  */
 244 #  undef strpbrk
 245 #  define strpbrk(s,a) \
 246      (GL_LINK_WARNING ("strpbrk cannot work correctly on character strings " \
 247                        "in multibyte locales - " \
 248                        "use mbspbrk if you care about internationalization"), \
 249       strpbrk (s, a))
 250 # endif
 251 #elif defined GNULIB_POSIXCHECK
 252 # undef strpbrk
 253 # define strpbrk(s,a) \
 254     (GL_LINK_WARNING ("strpbrk is unportable - " \
 255                       "use gnulib module strpbrk for portability"), \
 256      strpbrk (s, a))
 257 #endif
 258
 259 #if defined GNULIB_POSIXCHECK
 260 /* strspn() assumes the second argument is a list of single-byte characters.
 261    Even in this simple case, it cannot work with multibyte strings.  */
 262 # undef strspn
 263 # define strspn(s,a) \
 264     (GL_LINK_WARNING ("strspn cannot work correctly on character strings " \
 265                       "in multibyte locales - " \
 266                       "use mbsspn if you care about internationalization"), \
 267      strspn (s, a))
 268 #endif
 269
 270 #if defined GNULIB_POSIXCHECK
 271 /* strrchr() does not work with multibyte strings if the locale encoding is
 272    GB18030 and the character to be searched is a digit.  */
 273 # undef strrchr
 274 # define strrchr(s,c) \
 275     (GL_LINK_WARNING ("strrchr cannot work correctly on character strings " \
 276                       "in some multibyte locales - " \
 277                       "use mbsrchr if you care about internationalization"), \
 278      strrchr (s, c))
 279 #endif
 280
 281 /* Search the next delimiter (char listed in DELIM) starting at *STRINGP.
 282    If one is found, overwrite it with a NUL, and advance *STRINGP
 283    to point to the next char after it.  Otherwise, set *STRINGP to NULL.
 284    If *STRINGP was already NULL, nothing happens.
 285    Return the old value of *STRINGP.
 286
 287    This is a variant of strtok() that is multithread-safe and supports
 288    empty fields.
 289
 290    Caveat: It modifies the original string.
 291    Caveat: These functions cannot be used on constant strings.
 292    Caveat: The identity of the delimiting character is lost.
 293    Caveat: It doesn't work with multibyte strings unless all of the delimiter
 294            characters are ASCII characters < 0x30.
 295
 296    See also strtok_r().  */
 297 #if @GNULIB_STRSEP@
 298 # if ! @HAVE_STRSEP@
 299 extern char *strsep (char **restrict __stringp, char const *restrict __delim);
 300 # endif
 301 # if defined GNULIB_POSIXCHECK
 302 #  undef strsep
 303 #  define strsep(s,d) \
 304      (GL_LINK_WARNING ("strsep cannot work correctly on character strings " \
 305                        "in multibyte locales - " \
 306                        "use mbssep if you care about internationalization"), \
 307       strsep (s, d))
 308 # endif
 309 #elif defined GNULIB_POSIXCHECK
 310 # undef strsep
 311 # define strsep(s,d) \
 312     (GL_LINK_WARNING ("strsep is unportable - " \
 313                       "use gnulib module strsep for portability"), \
 314      strsep (s, d))
 315 #endif
 316
 317 #if @GNULIB_STRSTR@
 318 # if @REPLACE_STRSTR@
 319 #  define strstr rpl_strstr
 320 char *strstr (const char *haystack, const char *needle)
 321   __attribute__ ((__pure__));
 322 # endif
 323 #elif defined GNULIB_POSIXCHECK
 324 /* strstr() does not work with multibyte strings if the locale encoding is
 325    different from UTF-8:
 326    POSIX says that it operates on "strings", and "string" in POSIX is defined
 327    as a sequence of bytes, not of characters.  */
 328 # undef strstr
 329 # define strstr(a,b) \
 330     (GL_LINK_WARNING ("strstr is quadratic on many systems, and cannot " \
 331                       "work correctly on character strings in most "    \
 332                       "multibyte locales - " \
 333                       "use mbsstr if you care about internationalization, " \
 334                       "or use strstr if you care about speed"), \
 335      strstr (a, b))
 336 #endif
 337
 338 /* Find the first occurrence of NEEDLE in HAYSTACK, using case-insensitive
 339    comparison.  */
 340 #if @GNULIB_STRCASESTR@
 341 # if @REPLACE_STRCASESTR@
 342 #  define strcasestr rpl_strcasestr
 343 # endif
 344 # if ! @HAVE_STRCASESTR@ || @REPLACE_STRCASESTR@
 345 extern char *strcasestr (const char *haystack, const char *needle)
 346   __attribute__ ((__pure__));
 347 # endif
 348 #elif defined GNULIB_POSIXCHECK
 349 /* strcasestr() does not work with multibyte strings:
 350    It is a glibc extension, and glibc implements it only for unibyte
 351    locales.  */
 352 # undef strcasestr
 353 # define strcasestr(a,b) \
 354     (GL_LINK_WARNING ("strcasestr does work correctly on character strings " \
 355                       "in multibyte locales - " \
 356                       "use mbscasestr if you care about " \
 357                       "internationalization, or use c-strcasestr if you want " \
 358                       "a locale independent function"), \
 359      strcasestr (a, b))
 360 #endif
 361
 362 /* Parse S into tokens separated by characters in DELIM.
 363    If S is NULL, the saved pointer in SAVE_PTR is used as
 364    the next starting point.  For example:
 365         char s[] = "-abc-=-def";
 366         char *sp;
 367         x = strtok_r(s, "-", &sp);      // x = "abc", sp = "=-def"
 368         x = strtok_r(NULL, "-=", &sp);  // x = "def", sp = NULL
 369         x = strtok_r(NULL, "=", &sp);   // x = NULL
 370                 // s = "abc\0-def\0"
 371
 372    This is a variant of strtok() that is multithread-safe.
 373
 374    For the POSIX documentation for this function, see:
 375    http://www.opengroup.org/susv3xsh/strtok.html
 376
 377    Caveat: It modifies the original string.
 378    Caveat: These functions cannot be used on constant strings.
 379    Caveat: The identity of the delimiting character is lost.
 380    Caveat: It doesn't work with multibyte strings unless all of the delimiter
 381            characters are ASCII characters < 0x30.
 382
 383    See also strsep().  */
 384 #if @GNULIB_STRTOK_R@
 385 # if ! @HAVE_DECL_STRTOK_R@
 386 extern char *strtok_r (char *restrict s, char const *restrict delim,
 387                        char **restrict save_ptr);
 388 # endif
 389 # if defined GNULIB_POSIXCHECK
 390 #  undef strtok_r
 391 #  define strtok_r(s,d,p) \
 392      (GL_LINK_WARNING ("strtok_r cannot work correctly on character strings " \
 393                        "in multibyte locales - " \
 394                        "use mbstok_r if you care about internationalization"), \
 395       strtok_r (s, d, p))
 396 # endif
 397 #elif defined GNULIB_POSIXCHECK
 398 # undef strtok_r
 399 # define strtok_r(s,d,p) \
 400     (GL_LINK_WARNING ("strtok_r is unportable - " \
 401                       "use gnulib module strtok_r for portability"), \
 402      strtok_r (s, d, p))
 403 #endif
 404
 405
 406 /* The following functions are not specified by POSIX.  They are gnulib
 407    extensions.  */
 408
 409 #if @GNULIB_MBSLEN@
 410 /* Return the number of multibyte characters in the character string STRING.
 411    This considers multibyte characters, unlike strlen, which counts bytes.  */
 412 extern size_t mbslen (const char *string);
 413 #endif
 414
 415 #if @GNULIB_MBSNLEN@
 416 /* Return the number of multibyte characters in the character string starting
 417    at STRING and ending at STRING + LEN.  */
 418 extern size_t mbsnlen (const char *string, size_t len);
 419 #endif
 420
 421 #if @GNULIB_MBSCHR@
 422 /* Locate the first single-byte character C in the character string STRING,
 423    and return a pointer to it.  Return NULL if C is not found in STRING.
 424    Unlike strchr(), this function works correctly in multibyte locales with
 425    encodings such as GB18030.  */
 426 # define mbschr rpl_mbschr /* avoid collision with HP-UX function */
 427 extern char * mbschr (const char *string, int c);
 428 #endif
 429
 430 #if @GNULIB_MBSRCHR@
 431 /* Locate the last single-byte character C in the character string STRING,
 432    and return a pointer to it.  Return NULL if C is not found in STRING.
 433    Unlike strrchr(), this function works correctly in multibyte locales with
 434    encodings such as GB18030.  */
 435 # define mbsrchr rpl_mbsrchr /* avoid collision with HP-UX function */
 436 extern char * mbsrchr (const char *string, int c);
 437 #endif
 438
 439 #if @GNULIB_MBSSTR@
 440 /* Find the first occurrence of the character string NEEDLE in the character
 441    string HAYSTACK.  Return NULL if NEEDLE is not found in HAYSTACK.
 442    Unlike strstr(), this function works correctly in multibyte locales with
 443    encodings different from UTF-8.  */
 444 extern char * mbsstr (const char *haystack, const char *needle);
 445 #endif
 446
 447 #if @GNULIB_MBSCASECMP@
 448 /* Compare the character strings S1 and S2, ignoring case, returning less than,
 449    equal to or greater than zero if S1 is lexicographically less than, equal to
 450    or greater than S2.
 451    Note: This function may, in multibyte locales, return 0 for strings of
 452    different lengths!
 453    Unlike strcasecmp(), this function works correctly in multibyte locales.  */
 454 extern int mbscasecmp (const char *s1, const char *s2);
 455 #endif
 456
 457 #if @GNULIB_MBSNCASECMP@
 458 /* Compare the initial segment of the character string S1 consisting of at most
 459    N characters with the initial segment of the character string S2 consisting
 460    of at most N characters, ignoring case, returning less than, equal to or
 461    greater than zero if the initial segment of S1 is lexicographically less
 462    than, equal to or greater than the initial segment of S2.
 463    Note: This function may, in multibyte locales, return 0 for initial segments
 464    of different lengths!
 465    Unlike strncasecmp(), this function works correctly in multibyte locales.
 466    But beware that N is not a byte count but a character count!  */
 467 extern int mbsncasecmp (const char *s1, const char *s2, size_t n);
 468 #endif
 469
 470 #if @GNULIB_MBSPCASECMP@
 471 /* Compare the initial segment of the character string STRING consisting of
 472    at most mbslen (PREFIX) characters with the character string PREFIX,
 473    ignoring case, returning less than, equal to or greater than zero if this
 474    initial segment is lexicographically less than, equal to or greater than
 475    PREFIX.
 476    Note: This function may, in multibyte locales, return 0 if STRING is of
 477    smaller length than PREFIX!
 478    Unlike strncasecmp(), this function works correctly in multibyte
 479    locales.  */
 480 extern char * mbspcasecmp (const char *string, const char *prefix);
 481 #endif
 482
 483 #if @GNULIB_MBSCASESTR@
 484 /* Find the first occurrence of the character string NEEDLE in the character
 485    string HAYSTACK, using case-insensitive comparison.
 486    Note: This function may, in multibyte locales, return success even if
 487    strlen (haystack) < strlen (needle) !
 488    Unlike strcasestr(), this function works correctly in multibyte locales.  */
 489 extern char * mbscasestr (const char *haystack, const char *needle);
 490 #endif
 491
 492 #if @GNULIB_MBSCSPN@
 493 /* Find the first occurrence in the character string STRING of any character
 494    in the character string ACCEPT.  Return the number of bytes from the
 495    beginning of the string to this occurrence, or to the end of the string
 496    if none exists.
 497    Unlike strcspn(), this function works correctly in multibyte locales.  */
 498 extern size_t mbscspn (const char *string, const char *accept);
 499 #endif
 500
 501 #if @GNULIB_MBSPBRK@
 502 /* Find the first occurrence in the character string STRING of any character
 503    in the character string ACCEPT.  Return the pointer to it, or NULL if none
 504    exists.
 505    Unlike strpbrk(), this function works correctly in multibyte locales.  */
 506 # define mbspbrk rpl_mbspbrk /* avoid collision with HP-UX function */
 507 extern char * mbspbrk (const char *string, const char *accept);
 508 #endif
 509
 510 #if @GNULIB_MBSSPN@
 511 /* Find the first occurrence in the character string STRING of any character
 512    not in the character string REJECT.  Return the number of bytes from the
 513    beginning of the string to this occurrence, or to the end of the string
 514    if none exists.
 515    Unlike strspn(), this function works correctly in multibyte locales.  */
 516 extern size_t mbsspn (const char *string, const char *reject);
 517 #endif
 518
 519 #if @GNULIB_MBSSEP@
 520 /* Search the next delimiter (multibyte character listed in the character
 521    string DELIM) starting at the character string *STRINGP.
 522    If one is found, overwrite it with a NUL, and advance *STRINGP to point
 523    to the next multibyte character after it.  Otherwise, set *STRINGP to NULL.
 524    If *STRINGP was already NULL, nothing happens.
 525    Return the old value of *STRINGP.
 526
 527    This is a variant of mbstok_r() that supports empty fields.
 528
 529    Caveat: It modifies the original string.
 530    Caveat: These functions cannot be used on constant strings.
 531    Caveat: The identity of the delimiting character is lost.
 532
 533    See also mbstok_r().  */
 534 extern char * mbssep (char **stringp, const char *delim);
 535 #endif
 536
 537 #if @GNULIB_MBSTOK_R@
 538 /* Parse the character string STRING into tokens separated by characters in
 539    the character string DELIM.
 540    If STRING is NULL, the saved pointer in SAVE_PTR is used as
 541    the next starting point.  For example:
 542         char s[] = "-abc-=-def";
 543         char *sp;
 544         x = mbstok_r(s, "-", &sp);      // x = "abc", sp = "=-def"
 545         x = mbstok_r(NULL, "-=", &sp);  // x = "def", sp = NULL
 546         x = mbstok_r(NULL, "=", &sp);   // x = NULL
 547                 // s = "abc\0-def\0"
 548
 549    Caveat: It modifies the original string.
 550    Caveat: These functions cannot be used on constant strings.
 551    Caveat: The identity of the delimiting character is lost.
 552
 553    See also mbssep().  */
 554 extern char * mbstok_r (char *string, const char *delim, char **save_ptr);
 555 #endif
 556
 557 /* Map any int, typically from errno, into an error message.  */
 558 #if @GNULIB_STRERROR@
 559 # if @REPLACE_STRERROR@
 560 #  undef strerror
 561 #  define strerror rpl_strerror
 562 extern char *strerror (int);
 563 # endif
 564 #elif defined GNULIB_POSIXCHECK
 565 # undef strerror
 566 # define strerror(e) \
 567     (GL_LINK_WARNING ("strerror is unportable - " \
 568                       "use gnulib module strerror to guarantee non-NULL result"), \
 569      strerror (e))
 570 #endif
 571
 572 #if @GNULIB_STRSIGNAL@
 573 # if @REPLACE_STRSIGNAL@
 574 #  define strsignal rpl_strsignal
 575 # endif
 576 # if ! @HAVE_DECL_STRSIGNAL@ || @REPLACE_STRSIGNAL@
 577 extern char *strsignal (int __sig);
 578 # endif
 579 #elif defined GNULIB_POSIXCHECK
 580 # undef strsignal
 581 # define strsignal(a) \
 582     (GL_LINK_WARNING ("strsignal is unportable - " \
 583                       "use gnulib module strsignal for portability"), \
 584      strsignal (a))
 585 #endif
 586
 587 #if @GNULIB_STRVERSCMP@
 588 # if !@HAVE_STRVERSCMP@
 589 extern int strverscmp (const char *, const char *);
 590 # endif
 591 #elif defined GNULIB_POSIXCHECK
 592 # undef strverscmp
 593 # define strverscmp(a, b) \
 594     (GL_LINK_WARNING ("strverscmp is unportable - " \
 595                       "use gnulib module strverscmp for portability"), \
 596      strverscmp (a, b))
 597 #endif
 598
 599
 600 #ifdef __cplusplus
 601 }
 602 #endif
 603
 604 #endif /* _GL_STRING_H */
 605 #endif /* _GL_STRING_H */