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