lib/string.in.h

   1 /* A GNU-like <string.h>.
   2
   3    Copyright (C) 1995-1996, 2001-2020 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 2, 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, see <https://www.gnu.org/licenses/>.  */
  17
  18 #if __GNUC__ >= 3
  19 @PRAGMA_SYSTEM_HEADER@
  20 #endif
  21 @PRAGMA_COLUMNS@
  22
  23 #if defined _GL_ALREADY_INCLUDING_STRING_H
  24 /* Special invocation convention:
  25    - On OS X/NetBSD we have a sequence of nested includes
  26        <string.h> -> <strings.h> -> "string.h"
  27      In this situation system _chk variants due to -D_FORTIFY_SOURCE
  28      might be used after any replacements defined here.  */
  29
  30 #@INCLUDE_NEXT@ @NEXT_STRING_H@
  31
  32 #else
  33 /* Normal invocation convention.  */
  34
  35 #ifndef _@GUARD_PREFIX@_STRING_H
  36
  37 #define _GL_ALREADY_INCLUDING_STRING_H
  38
  39 /* The include_next requires a split double-inclusion guard.  */
  40 #@INCLUDE_NEXT@ @NEXT_STRING_H@
  41
  42 #undef _GL_ALREADY_INCLUDING_STRING_H
  43
  44 #ifndef _@GUARD_PREFIX@_STRING_H
  45 #define _@GUARD_PREFIX@_STRING_H
  46
  47 /* NetBSD 5.0 mis-defines NULL.  */
  48 #include <stddef.h>
  49
  50 /* MirBSD defines mbslen as a macro.  */
  51 #if @GNULIB_MBSLEN@ && defined __MirBSD__
  52 # include <wchar.h>
  53 #endif
  54
  55 /* The __attribute__ feature is available in gcc versions 2.5 and later.
  56    The attribute __pure__ was added in gcc 2.96.  */
  57 #ifndef _GL_ATTRIBUTE_PURE
  58 # if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96) || defined __clang__
  59 #  define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
  60 # else
  61 #  define _GL_ATTRIBUTE_PURE /* empty */
  62 # endif
  63 #endif
  64
  65 /* NetBSD 5.0 declares strsignal in <unistd.h>, not in <string.h>.  */
  66 /* But in any case avoid namespace pollution on glibc systems.  */
  67 #if (@GNULIB_STRSIGNAL@ || defined GNULIB_POSIXCHECK) && defined __NetBSD__ \
  68     && ! defined __GLIBC__
  69 # include <unistd.h>
  70 #endif
  71
  72 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
  73
  74 /* The definition of _GL_ARG_NONNULL is copied here.  */
  75
  76 /* The definition of _GL_WARN_ON_USE is copied here.  */
  77
  78
  79 /* Clear a block of memory.  The compiler will not delete a call to
  80    this function, even if the block is dead after the call.  */
  81 #if @GNULIB_EXPLICIT_BZERO@
  82 # if ! @HAVE_EXPLICIT_BZERO@
  83 _GL_FUNCDECL_SYS (explicit_bzero, void,
  84                   (void *__dest, size_t __n) _GL_ARG_NONNULL ((1)));
  85 # endif
  86 _GL_CXXALIAS_SYS (explicit_bzero, void, (void *__dest, size_t __n));
  87 _GL_CXXALIASWARN (explicit_bzero);
  88 #elif defined GNULIB_POSIXCHECK
  89 # undef explicit_bzero
  90 # if HAVE_RAW_DECL_EXPLICIT_BZERO
  91 _GL_WARN_ON_USE (explicit_bzero, "explicit_bzero is unportable - "
  92                  "use gnulib module explicit_bzero for portability");
  93 # endif
  94 #endif
  95
  96 /* Find the index of the least-significant set bit.  */
  97 #if @GNULIB_FFSL@
  98 # if !@HAVE_FFSL@
  99 _GL_FUNCDECL_SYS (ffsl, int, (long int i));
 100 # endif
 101 _GL_CXXALIAS_SYS (ffsl, int, (long int i));
 102 _GL_CXXALIASWARN (ffsl);
 103 #elif defined GNULIB_POSIXCHECK
 104 # undef ffsl
 105 # if HAVE_RAW_DECL_FFSL
 106 _GL_WARN_ON_USE (ffsl, "ffsl is not portable - use the ffsl module");
 107 # endif
 108 #endif
 109
 110
 111 /* Find the index of the least-significant set bit.  */
 112 #if @GNULIB_FFSLL@
 113 # if !@HAVE_FFSLL@
 114 _GL_FUNCDECL_SYS (ffsll, int, (long long int i));
 115 # endif
 116 _GL_CXXALIAS_SYS (ffsll, int, (long long int i));
 117 _GL_CXXALIASWARN (ffsll);
 118 #elif defined GNULIB_POSIXCHECK
 119 # undef ffsll
 120 # if HAVE_RAW_DECL_FFSLL
 121 _GL_WARN_ON_USE (ffsll, "ffsll is not portable - use the ffsll module");
 122 # endif
 123 #endif
 124
 125
 126 #if defined _WIN32 && !defined __CYGWIN__
 127 # undef memccpy
 128 # define memccpy _memccpy
 129 #endif
 130
 131
 132 /* Return the first instance of C within N bytes of S, or NULL.  */
 133 #if @GNULIB_MEMCHR@
 134 # if @REPLACE_MEMCHR@
 135 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 136 #   define memchr rpl_memchr
 137 #  endif
 138 _GL_FUNCDECL_RPL (memchr, void *, (void const *__s, int __c, size_t __n)
 139                                   _GL_ATTRIBUTE_PURE
 140                                   _GL_ARG_NONNULL ((1)));
 141 _GL_CXXALIAS_RPL (memchr, void *, (void const *__s, int __c, size_t __n));
 142 # else
 143   /* On some systems, this function is defined as an overloaded function:
 144        extern "C" { const void * std::memchr (const void *, int, size_t); }
 145        extern "C++" { void * std::memchr (void *, int, size_t); }  */
 146 _GL_CXXALIAS_SYS_CAST2 (memchr,
 147                         void *, (void const *__s, int __c, size_t __n),
 148                         void const *, (void const *__s, int __c, size_t __n));
 149 # endif
 150 # if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
 151      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 152 _GL_CXXALIASWARN1 (memchr, void *, (void *__s, int __c, size_t __n));
 153 _GL_CXXALIASWARN1 (memchr, void const *,
 154                    (void const *__s, int __c, size_t __n));
 155 # elif __GLIBC__ >= 2
 156 _GL_CXXALIASWARN (memchr);
 157 # endif
 158 #elif defined GNULIB_POSIXCHECK
 159 # undef memchr
 160 /* Assume memchr is always declared.  */
 161 _GL_WARN_ON_USE (memchr, "memchr has platform-specific bugs - "
 162                  "use gnulib module memchr for portability" );
 163 #endif
 164
 165 /* Return the first occurrence of NEEDLE in HAYSTACK.  */
 166 #if @GNULIB_MEMMEM@
 167 # if @REPLACE_MEMMEM@
 168 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 169 #   define memmem rpl_memmem
 170 #  endif
 171 _GL_FUNCDECL_RPL (memmem, void *,
 172                   (void const *__haystack, size_t __haystack_len,
 173                    void const *__needle, size_t __needle_len)
 174                   _GL_ATTRIBUTE_PURE
 175                   _GL_ARG_NONNULL ((1, 3)));
 176 _GL_CXXALIAS_RPL (memmem, void *,
 177                   (void const *__haystack, size_t __haystack_len,
 178                    void const *__needle, size_t __needle_len));
 179 # else
 180 #  if ! @HAVE_DECL_MEMMEM@
 181 _GL_FUNCDECL_SYS (memmem, void *,
 182                   (void const *__haystack, size_t __haystack_len,
 183                    void const *__needle, size_t __needle_len)
 184                   _GL_ATTRIBUTE_PURE
 185                   _GL_ARG_NONNULL ((1, 3)));
 186 #  endif
 187 _GL_CXXALIAS_SYS (memmem, void *,
 188                   (void const *__haystack, size_t __haystack_len,
 189                    void const *__needle, size_t __needle_len));
 190 # endif
 191 _GL_CXXALIASWARN (memmem);
 192 #elif defined GNULIB_POSIXCHECK
 193 # undef memmem
 194 # if HAVE_RAW_DECL_MEMMEM
 195 _GL_WARN_ON_USE (memmem, "memmem is unportable and often quadratic - "
 196                  "use gnulib module memmem-simple for portability, "
 197                  "and module memmem for speed" );
 198 # endif
 199 #endif
 200
 201 /* Copy N bytes of SRC to DEST, return pointer to bytes after the
 202    last written byte.  */
 203 #if @GNULIB_MEMPCPY@
 204 # if ! @HAVE_MEMPCPY@
 205 _GL_FUNCDECL_SYS (mempcpy, void *,
 206                   (void *restrict __dest, void const *restrict __src,
 207                    size_t __n)
 208                   _GL_ARG_NONNULL ((1, 2)));
 209 # endif
 210 _GL_CXXALIAS_SYS (mempcpy, void *,
 211                   (void *restrict __dest, void const *restrict __src,
 212                    size_t __n));
 213 _GL_CXXALIASWARN (mempcpy);
 214 #elif defined GNULIB_POSIXCHECK
 215 # undef mempcpy
 216 # if HAVE_RAW_DECL_MEMPCPY
 217 _GL_WARN_ON_USE (mempcpy, "mempcpy is unportable - "
 218                  "use gnulib module mempcpy for portability");
 219 # endif
 220 #endif
 221
 222 /* Search backwards through a block for a byte (specified as an int).  */
 223 #if @GNULIB_MEMRCHR@
 224 # if ! @HAVE_DECL_MEMRCHR@
 225 _GL_FUNCDECL_SYS (memrchr, void *, (void const *, int, size_t)
 226                                    _GL_ATTRIBUTE_PURE
 227                                    _GL_ARG_NONNULL ((1)));
 228 # endif
 229   /* On some systems, this function is defined as an overloaded function:
 230        extern "C++" { const void * std::memrchr (const void *, int, size_t); }
 231        extern "C++" { void * std::memrchr (void *, int, size_t); }  */
 232 _GL_CXXALIAS_SYS_CAST2 (memrchr,
 233                         void *, (void const *, int, size_t),
 234                         void const *, (void const *, int, size_t));
 235 # if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
 236      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 237 _GL_CXXALIASWARN1 (memrchr, void *, (void *, int, size_t));
 238 _GL_CXXALIASWARN1 (memrchr, void const *, (void const *, int, size_t));
 239 # else
 240 _GL_CXXALIASWARN (memrchr);
 241 # endif
 242 #elif defined GNULIB_POSIXCHECK
 243 # undef memrchr
 244 # if HAVE_RAW_DECL_MEMRCHR
 245 _GL_WARN_ON_USE (memrchr, "memrchr is unportable - "
 246                  "use gnulib module memrchr for portability");
 247 # endif
 248 #endif
 249
 250 /* Find the first occurrence of C in S.  More efficient than
 251    memchr(S,C,N), at the expense of undefined behavior if C does not
 252    occur within N bytes.  */
 253 #if @GNULIB_RAWMEMCHR@
 254 # if ! @HAVE_RAWMEMCHR@
 255 _GL_FUNCDECL_SYS (rawmemchr, void *, (void const *__s, int __c_in)
 256                                      _GL_ATTRIBUTE_PURE
 257                                      _GL_ARG_NONNULL ((1)));
 258 # endif
 259   /* On some systems, this function is defined as an overloaded function:
 260        extern "C++" { const void * std::rawmemchr (const void *, int); }
 261        extern "C++" { void * std::rawmemchr (void *, int); }  */
 262 _GL_CXXALIAS_SYS_CAST2 (rawmemchr,
 263                         void *, (void const *__s, int __c_in),
 264                         void const *, (void const *__s, int __c_in));
 265 # if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
 266      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 267 _GL_CXXALIASWARN1 (rawmemchr, void *, (void *__s, int __c_in));
 268 _GL_CXXALIASWARN1 (rawmemchr, void const *, (void const *__s, int __c_in));
 269 # else
 270 _GL_CXXALIASWARN (rawmemchr);
 271 # endif
 272 #elif defined GNULIB_POSIXCHECK
 273 # undef rawmemchr
 274 # if HAVE_RAW_DECL_RAWMEMCHR
 275 _GL_WARN_ON_USE (rawmemchr, "rawmemchr is unportable - "
 276                  "use gnulib module rawmemchr for portability");
 277 # endif
 278 #endif
 279
 280 /* Copy SRC to DST, returning the address of the terminating '\0' in DST.  */
 281 #if @GNULIB_STPCPY@
 282 # if ! @HAVE_STPCPY@
 283 _GL_FUNCDECL_SYS (stpcpy, char *,
 284                   (char *restrict __dst, char const *restrict __src)
 285                   _GL_ARG_NONNULL ((1, 2)));
 286 # endif
 287 _GL_CXXALIAS_SYS (stpcpy, char *,
 288                   (char *restrict __dst, char const *restrict __src));
 289 _GL_CXXALIASWARN (stpcpy);
 290 #elif defined GNULIB_POSIXCHECK
 291 # undef stpcpy
 292 # if HAVE_RAW_DECL_STPCPY
 293 _GL_WARN_ON_USE (stpcpy, "stpcpy is unportable - "
 294                  "use gnulib module stpcpy for portability");
 295 # endif
 296 #endif
 297
 298 /* Copy no more than N bytes of SRC to DST, returning a pointer past the
 299    last non-NUL byte written into DST.  */
 300 #if @GNULIB_STPNCPY@
 301 # if @REPLACE_STPNCPY@
 302 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 303 #   undef stpncpy
 304 #   define stpncpy rpl_stpncpy
 305 #  endif
 306 _GL_FUNCDECL_RPL (stpncpy, char *,
 307                   (char *restrict __dst, char const *restrict __src,
 308                    size_t __n)
 309                   _GL_ARG_NONNULL ((1, 2)));
 310 _GL_CXXALIAS_RPL (stpncpy, char *,
 311                   (char *restrict __dst, char const *restrict __src,
 312                    size_t __n));
 313 # else
 314 #  if ! @HAVE_STPNCPY@
 315 _GL_FUNCDECL_SYS (stpncpy, char *,
 316                   (char *restrict __dst, char const *restrict __src,
 317                    size_t __n)
 318                   _GL_ARG_NONNULL ((1, 2)));
 319 #  endif
 320 _GL_CXXALIAS_SYS (stpncpy, char *,
 321                   (char *restrict __dst, char const *restrict __src,
 322                    size_t __n));
 323 # endif
 324 _GL_CXXALIASWARN (stpncpy);
 325 #elif defined GNULIB_POSIXCHECK
 326 # undef stpncpy
 327 # if HAVE_RAW_DECL_STPNCPY
 328 _GL_WARN_ON_USE (stpncpy, "stpncpy is unportable - "
 329                  "use gnulib module stpncpy for portability");
 330 # endif
 331 #endif
 332
 333 #if defined GNULIB_POSIXCHECK
 334 /* strchr() does not work with multibyte strings if the locale encoding is
 335    GB18030 and the character to be searched is a digit.  */
 336 # undef strchr
 337 /* Assume strchr is always declared.  */
 338 _GL_WARN_ON_USE_CXX (strchr,
 339                      const char *, char *, (const char *, int),
 340                      "strchr cannot work correctly on character strings "
 341                      "in some multibyte locales - "
 342                      "use mbschr if you care about internationalization");
 343 #endif
 344
 345 /* Find the first occurrence of C in S or the final NUL byte.  */
 346 #if @GNULIB_STRCHRNUL@
 347 # if @REPLACE_STRCHRNUL@
 348 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 349 #   define strchrnul rpl_strchrnul
 350 #  endif
 351 _GL_FUNCDECL_RPL (strchrnul, char *, (const char *__s, int __c_in)
 352                                      _GL_ATTRIBUTE_PURE
 353                                      _GL_ARG_NONNULL ((1)));
 354 _GL_CXXALIAS_RPL (strchrnul, char *,
 355                   (const char *str, int ch));
 356 # else
 357 #  if ! @HAVE_STRCHRNUL@
 358 _GL_FUNCDECL_SYS (strchrnul, char *, (char const *__s, int __c_in)
 359                                      _GL_ATTRIBUTE_PURE
 360                                      _GL_ARG_NONNULL ((1)));
 361 #  endif
 362   /* On some systems, this function is defined as an overloaded function:
 363        extern "C++" { const char * std::strchrnul (const char *, int); }
 364        extern "C++" { char * std::strchrnul (char *, int); }  */
 365 _GL_CXXALIAS_SYS_CAST2 (strchrnul,
 366                         char *, (char const *__s, int __c_in),
 367                         char const *, (char const *__s, int __c_in));
 368 # endif
 369 # if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
 370      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 371 _GL_CXXALIASWARN1 (strchrnul, char *, (char *__s, int __c_in));
 372 _GL_CXXALIASWARN1 (strchrnul, char const *, (char const *__s, int __c_in));
 373 # else
 374 _GL_CXXALIASWARN (strchrnul);
 375 # endif
 376 #elif defined GNULIB_POSIXCHECK
 377 # undef strchrnul
 378 # if HAVE_RAW_DECL_STRCHRNUL
 379 _GL_WARN_ON_USE (strchrnul, "strchrnul is unportable - "
 380                  "use gnulib module strchrnul for portability");
 381 # endif
 382 #endif
 383
 384 /* Duplicate S, returning an identical malloc'd string.  */
 385 #if @GNULIB_STRDUP@
 386 # if @REPLACE_STRDUP@
 387 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 388 #   undef strdup
 389 #   define strdup rpl_strdup
 390 #  endif
 391 _GL_FUNCDECL_RPL (strdup, char *, (char const *__s) _GL_ARG_NONNULL ((1)));
 392 _GL_CXXALIAS_RPL (strdup, char *, (char const *__s));
 393 # elif defined _WIN32 && !defined __CYGWIN__
 394 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 395 #   undef strdup
 396 #   define strdup _strdup
 397 #  endif
 398 _GL_CXXALIAS_MDA (strdup, char *, (char const *__s));
 399 # else
 400 #  if defined __cplusplus && defined GNULIB_NAMESPACE && defined strdup
 401     /* strdup exists as a function and as a macro.  Get rid of the macro.  */
 402 #   undef strdup
 403 #  endif
 404 #  if !(@HAVE_DECL_STRDUP@ || defined strdup)
 405 _GL_FUNCDECL_SYS (strdup, char *, (char const *__s) _GL_ARG_NONNULL ((1)));
 406 #  endif
 407 _GL_CXXALIAS_SYS (strdup, char *, (char const *__s));
 408 # endif
 409 _GL_CXXALIASWARN (strdup);
 410 #elif defined GNULIB_POSIXCHECK
 411 # undef strdup
 412 # if HAVE_RAW_DECL_STRDUP
 413 _GL_WARN_ON_USE (strdup, "strdup is unportable - "
 414                  "use gnulib module strdup for portability");
 415 # endif
 416 #elif defined _WIN32 && !defined __CYGWIN__
 417 # undef strdup
 418 # define strdup _strdup
 419 #endif
 420
 421 /* Append no more than N characters from SRC onto DEST.  */
 422 #if @GNULIB_STRNCAT@
 423 # if @REPLACE_STRNCAT@
 424 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 425 #   undef strncat
 426 #   define strncat rpl_strncat
 427 #  endif
 428 _GL_FUNCDECL_RPL (strncat, char *,
 429                   (char *restrict dest, const char *restrict src, size_t n)
 430                   _GL_ARG_NONNULL ((1, 2)));
 431 _GL_CXXALIAS_RPL (strncat, char *,
 432                   (char *restrict dest, const char *restrict src, size_t n));
 433 # else
 434 _GL_CXXALIAS_SYS (strncat, char *,
 435                   (char *restrict dest, const char *restrict src, size_t n));
 436 # endif
 437 # if __GLIBC__ >= 2
 438 _GL_CXXALIASWARN (strncat);
 439 # endif
 440 #elif defined GNULIB_POSIXCHECK
 441 # undef strncat
 442 # if HAVE_RAW_DECL_STRNCAT
 443 _GL_WARN_ON_USE (strncat, "strncat is unportable - "
 444                  "use gnulib module strncat for portability");
 445 # endif
 446 #endif
 447
 448 /* Return a newly allocated copy of at most N bytes of STRING.  */
 449 #if @GNULIB_STRNDUP@
 450 # if @REPLACE_STRNDUP@
 451 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 452 #   undef strndup
 453 #   define strndup rpl_strndup
 454 #  endif
 455 _GL_FUNCDECL_RPL (strndup, char *, (char const *__s, size_t __n)
 456                                    _GL_ARG_NONNULL ((1)));
 457 _GL_CXXALIAS_RPL (strndup, char *, (char const *__s, size_t __n));
 458 # else
 459 #  if ! @HAVE_DECL_STRNDUP@
 460 _GL_FUNCDECL_SYS (strndup, char *, (char const *__s, size_t __n)
 461                                    _GL_ARG_NONNULL ((1)));
 462 #  endif
 463 _GL_CXXALIAS_SYS (strndup, char *, (char const *__s, size_t __n));
 464 # endif
 465 _GL_CXXALIASWARN (strndup);
 466 #elif defined GNULIB_POSIXCHECK
 467 # undef strndup
 468 # if HAVE_RAW_DECL_STRNDUP
 469 _GL_WARN_ON_USE (strndup, "strndup is unportable - "
 470                  "use gnulib module strndup for portability");
 471 # endif
 472 #endif
 473
 474 /* Find the length (number of bytes) of STRING, but scan at most
 475    MAXLEN bytes.  If no '\0' terminator is found in that many bytes,
 476    return MAXLEN.  */
 477 #if @GNULIB_STRNLEN@
 478 # if @REPLACE_STRNLEN@
 479 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 480 #   undef strnlen
 481 #   define strnlen rpl_strnlen
 482 #  endif
 483 _GL_FUNCDECL_RPL (strnlen, size_t, (char const *__s, size_t __maxlen)
 484                                    _GL_ATTRIBUTE_PURE
 485                                    _GL_ARG_NONNULL ((1)));
 486 _GL_CXXALIAS_RPL (strnlen, size_t, (char const *__s, size_t __maxlen));
 487 # else
 488 #  if ! @HAVE_DECL_STRNLEN@
 489 _GL_FUNCDECL_SYS (strnlen, size_t, (char const *__s, size_t __maxlen)
 490                                    _GL_ATTRIBUTE_PURE
 491                                    _GL_ARG_NONNULL ((1)));
 492 #  endif
 493 _GL_CXXALIAS_SYS (strnlen, size_t, (char const *__s, size_t __maxlen));
 494 # endif
 495 _GL_CXXALIASWARN (strnlen);
 496 #elif defined GNULIB_POSIXCHECK
 497 # undef strnlen
 498 # if HAVE_RAW_DECL_STRNLEN
 499 _GL_WARN_ON_USE (strnlen, "strnlen is unportable - "
 500                  "use gnulib module strnlen for portability");
 501 # endif
 502 #endif
 503
 504 #if defined GNULIB_POSIXCHECK
 505 /* strcspn() assumes the second argument is a list of single-byte characters.
 506    Even in this simple case, it does not work with multibyte strings if the
 507    locale encoding is GB18030 and one of the characters to be searched is a
 508    digit.  */
 509 # undef strcspn
 510 /* Assume strcspn is always declared.  */
 511 _GL_WARN_ON_USE (strcspn, "strcspn cannot work correctly on character strings "
 512                  "in multibyte locales - "
 513                  "use mbscspn if you care about internationalization");
 514 #endif
 515
 516 /* Find the first occurrence in S of any character in ACCEPT.  */
 517 #if @GNULIB_STRPBRK@
 518 # if ! @HAVE_STRPBRK@
 519 _GL_FUNCDECL_SYS (strpbrk, char *, (char const *__s, char const *__accept)
 520                                    _GL_ATTRIBUTE_PURE
 521                                    _GL_ARG_NONNULL ((1, 2)));
 522 # endif
 523   /* On some systems, this function is defined as an overloaded function:
 524        extern "C" { const char * strpbrk (const char *, const char *); }
 525        extern "C++" { char * strpbrk (char *, const char *); }  */
 526 _GL_CXXALIAS_SYS_CAST2 (strpbrk,
 527                         char *, (char const *__s, char const *__accept),
 528                         const char *, (char const *__s, char const *__accept));
 529 # if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
 530      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 531 _GL_CXXALIASWARN1 (strpbrk, char *, (char *__s, char const *__accept));
 532 _GL_CXXALIASWARN1 (strpbrk, char const *,
 533                    (char const *__s, char const *__accept));
 534 # elif __GLIBC__ >= 2
 535 _GL_CXXALIASWARN (strpbrk);
 536 # endif
 537 # if defined GNULIB_POSIXCHECK
 538 /* strpbrk() assumes the second argument is a list of single-byte characters.
 539    Even in this simple case, it does not work with multibyte strings if the
 540    locale encoding is GB18030 and one of the characters to be searched is a
 541    digit.  */
 542 #  undef strpbrk
 543 _GL_WARN_ON_USE_CXX (strpbrk,
 544                      const char *, char *, (const char *, const char *),
 545                      "strpbrk cannot work correctly on character strings "
 546                      "in multibyte locales - "
 547                      "use mbspbrk if you care about internationalization");
 548 # endif
 549 #elif defined GNULIB_POSIXCHECK
 550 # undef strpbrk
 551 # if HAVE_RAW_DECL_STRPBRK
 552 _GL_WARN_ON_USE_CXX (strpbrk,
 553                      const char *, char *, (const char *, const char *),
 554                      "strpbrk is unportable - "
 555                      "use gnulib module strpbrk for portability");
 556 # endif
 557 #endif
 558
 559 #if defined GNULIB_POSIXCHECK
 560 /* strspn() assumes the second argument is a list of single-byte characters.
 561    Even in this simple case, it cannot work with multibyte strings.  */
 562 # undef strspn
 563 /* Assume strspn is always declared.  */
 564 _GL_WARN_ON_USE (strspn, "strspn cannot work correctly on character strings "
 565                  "in multibyte locales - "
 566                  "use mbsspn if you care about internationalization");
 567 #endif
 568
 569 #if defined GNULIB_POSIXCHECK
 570 /* strrchr() does not work with multibyte strings if the locale encoding is
 571    GB18030 and the character to be searched is a digit.  */
 572 # undef strrchr
 573 /* Assume strrchr is always declared.  */
 574 _GL_WARN_ON_USE_CXX (strrchr,
 575                      const char *, char *, (const char *, int),
 576                      "strrchr cannot work correctly on character strings "
 577                      "in some multibyte locales - "
 578                      "use mbsrchr if you care about internationalization");
 579 #endif
 580
 581 /* Search the next delimiter (char listed in DELIM) starting at *STRINGP.
 582    If one is found, overwrite it with a NUL, and advance *STRINGP
 583    to point to the next char after it.  Otherwise, set *STRINGP to NULL.
 584    If *STRINGP was already NULL, nothing happens.
 585    Return the old value of *STRINGP.
 586
 587    This is a variant of strtok() that is multithread-safe and supports
 588    empty fields.
 589
 590    Caveat: It modifies the original string.
 591    Caveat: These functions cannot be used on constant strings.
 592    Caveat: The identity of the delimiting character is lost.
 593    Caveat: It doesn't work with multibyte strings unless all of the delimiter
 594            characters are ASCII characters < 0x30.
 595
 596    See also strtok_r().  */
 597 #if @GNULIB_STRSEP@
 598 # if ! @HAVE_STRSEP@
 599 _GL_FUNCDECL_SYS (strsep, char *,
 600                   (char **restrict __stringp, char const *restrict __delim)
 601                   _GL_ARG_NONNULL ((1, 2)));
 602 # endif
 603 _GL_CXXALIAS_SYS (strsep, char *,
 604                   (char **restrict __stringp, char const *restrict __delim));
 605 _GL_CXXALIASWARN (strsep);
 606 # if defined GNULIB_POSIXCHECK
 607 #  undef strsep
 608 _GL_WARN_ON_USE (strsep, "strsep cannot work correctly on character strings "
 609                  "in multibyte locales - "
 610                  "use mbssep if you care about internationalization");
 611 # endif
 612 #elif defined GNULIB_POSIXCHECK
 613 # undef strsep
 614 # if HAVE_RAW_DECL_STRSEP
 615 _GL_WARN_ON_USE (strsep, "strsep is unportable - "
 616                  "use gnulib module strsep for portability");
 617 # endif
 618 #endif
 619
 620 #if @GNULIB_STRSTR@
 621 # if @REPLACE_STRSTR@
 622 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 623 #   define strstr rpl_strstr
 624 #  endif
 625 _GL_FUNCDECL_RPL (strstr, char *, (const char *haystack, const char *needle)
 626                                   _GL_ATTRIBUTE_PURE
 627                                   _GL_ARG_NONNULL ((1, 2)));
 628 _GL_CXXALIAS_RPL (strstr, char *, (const char *haystack, const char *needle));
 629 # else
 630   /* On some systems, this function is defined as an overloaded function:
 631        extern "C++" { const char * strstr (const char *, const char *); }
 632        extern "C++" { char * strstr (char *, const char *); }  */
 633 _GL_CXXALIAS_SYS_CAST2 (strstr,
 634                         char *, (const char *haystack, const char *needle),
 635                         const char *, (const char *haystack, const char *needle));
 636 # endif
 637 # if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
 638      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 639 _GL_CXXALIASWARN1 (strstr, char *, (char *haystack, const char *needle));
 640 _GL_CXXALIASWARN1 (strstr, const char *,
 641                    (const char *haystack, const char *needle));
 642 # elif __GLIBC__ >= 2
 643 _GL_CXXALIASWARN (strstr);
 644 # endif
 645 #elif defined GNULIB_POSIXCHECK
 646 /* strstr() does not work with multibyte strings if the locale encoding is
 647    different from UTF-8:
 648    POSIX says that it operates on "strings", and "string" in POSIX is defined
 649    as a sequence of bytes, not of characters.  */
 650 # undef strstr
 651 /* Assume strstr is always declared.  */
 652 _GL_WARN_ON_USE (strstr, "strstr is quadratic on many systems, and cannot "
 653                  "work correctly on character strings in most "
 654                  "multibyte locales - "
 655                  "use mbsstr if you care about internationalization, "
 656                  "or use strstr if you care about speed");
 657 #endif
 658
 659 /* Find the first occurrence of NEEDLE in HAYSTACK, using case-insensitive
 660    comparison.  */
 661 #if @GNULIB_STRCASESTR@
 662 # if @REPLACE_STRCASESTR@
 663 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 664 #   define strcasestr rpl_strcasestr
 665 #  endif
 666 _GL_FUNCDECL_RPL (strcasestr, char *,
 667                   (const char *haystack, const char *needle)
 668                   _GL_ATTRIBUTE_PURE
 669                   _GL_ARG_NONNULL ((1, 2)));
 670 _GL_CXXALIAS_RPL (strcasestr, char *,
 671                   (const char *haystack, const char *needle));
 672 # else
 673 #  if ! @HAVE_STRCASESTR@
 674 _GL_FUNCDECL_SYS (strcasestr, char *,
 675                   (const char *haystack, const char *needle)
 676                   _GL_ATTRIBUTE_PURE
 677                   _GL_ARG_NONNULL ((1, 2)));
 678 #  endif
 679   /* On some systems, this function is defined as an overloaded function:
 680        extern "C++" { const char * strcasestr (const char *, const char *); }
 681        extern "C++" { char * strcasestr (char *, const char *); }  */
 682 _GL_CXXALIAS_SYS_CAST2 (strcasestr,
 683                         char *, (const char *haystack, const char *needle),
 684                         const char *, (const char *haystack, const char *needle));
 685 # endif
 686 # if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \
 687      && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
 688 _GL_CXXALIASWARN1 (strcasestr, char *, (char *haystack, const char *needle));
 689 _GL_CXXALIASWARN1 (strcasestr, const char *,
 690                    (const char *haystack, const char *needle));
 691 # else
 692 _GL_CXXALIASWARN (strcasestr);
 693 # endif
 694 #elif defined GNULIB_POSIXCHECK
 695 /* strcasestr() does not work with multibyte strings:
 696    It is a glibc extension, and glibc implements it only for unibyte
 697    locales.  */
 698 # undef strcasestr
 699 # if HAVE_RAW_DECL_STRCASESTR
 700 _GL_WARN_ON_USE (strcasestr, "strcasestr does work correctly on character "
 701                  "strings in multibyte locales - "
 702                  "use mbscasestr if you care about "
 703                  "internationalization, or use c-strcasestr if you want "
 704                  "a locale independent function");
 705 # endif
 706 #endif
 707
 708 /* Parse S into tokens separated by characters in DELIM.
 709    If S is NULL, the saved pointer in SAVE_PTR is used as
 710    the next starting point.  For example:
 711         char s[] = "-abc-=-def";
 712         char *sp;
 713         x = strtok_r(s, "-", &sp);      // x = "abc", sp = "=-def"
 714         x = strtok_r(NULL, "-=", &sp);  // x = "def", sp = NULL
 715         x = strtok_r(NULL, "=", &sp);   // x = NULL
 716                 // s = "abc\0-def\0"
 717
 718    This is a variant of strtok() that is multithread-safe.
 719
 720    For the POSIX documentation for this function, see:
 721    https://pubs.opengroup.org/onlinepubs/9699919799/functions/strtok.html
 722
 723    Caveat: It modifies the original string.
 724    Caveat: These functions cannot be used on constant strings.
 725    Caveat: The identity of the delimiting character is lost.
 726    Caveat: It doesn't work with multibyte strings unless all of the delimiter
 727            characters are ASCII characters < 0x30.
 728
 729    See also strsep().  */
 730 #if @GNULIB_STRTOK_R@
 731 # if @REPLACE_STRTOK_R@
 732 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 733 #   undef strtok_r
 734 #   define strtok_r rpl_strtok_r
 735 #  endif
 736 _GL_FUNCDECL_RPL (strtok_r, char *,
 737                   (char *restrict s, char const *restrict delim,
 738                    char **restrict save_ptr)
 739                   _GL_ARG_NONNULL ((2, 3)));
 740 _GL_CXXALIAS_RPL (strtok_r, char *,
 741                   (char *restrict s, char const *restrict delim,
 742                    char **restrict save_ptr));
 743 # else
 744 #  if @UNDEFINE_STRTOK_R@ || defined GNULIB_POSIXCHECK
 745 #   undef strtok_r
 746 #  endif
 747 #  if ! @HAVE_DECL_STRTOK_R@
 748 _GL_FUNCDECL_SYS (strtok_r, char *,
 749                   (char *restrict s, char const *restrict delim,
 750                    char **restrict save_ptr)
 751                   _GL_ARG_NONNULL ((2, 3)));
 752 #  endif
 753 _GL_CXXALIAS_SYS (strtok_r, char *,
 754                   (char *restrict s, char const *restrict delim,
 755                    char **restrict save_ptr));
 756 # endif
 757 _GL_CXXALIASWARN (strtok_r);
 758 # if defined GNULIB_POSIXCHECK
 759 _GL_WARN_ON_USE (strtok_r, "strtok_r cannot work correctly on character "
 760                  "strings in multibyte locales - "
 761                  "use mbstok_r if you care about internationalization");
 762 # endif
 763 #elif defined GNULIB_POSIXCHECK
 764 # undef strtok_r
 765 # if HAVE_RAW_DECL_STRTOK_R
 766 _GL_WARN_ON_USE (strtok_r, "strtok_r is unportable - "
 767                  "use gnulib module strtok_r for portability");
 768 # endif
 769 #endif
 770
 771
 772 /* The following functions are not specified by POSIX.  They are gnulib
 773    extensions.  */
 774
 775 #if @GNULIB_MBSLEN@
 776 /* Return the number of multibyte characters in the character string STRING.
 777    This considers multibyte characters, unlike strlen, which counts bytes.  */
 778 # ifdef __MirBSD__  /* MirBSD defines mbslen as a macro.  Override it.  */
 779 #  undef mbslen
 780 # endif
 781 # if @HAVE_MBSLEN@  /* AIX, OSF/1, MirBSD define mbslen already in libc.  */
 782 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 783 #   define mbslen rpl_mbslen
 784 #  endif
 785 _GL_FUNCDECL_RPL (mbslen, size_t, (const char *string)
 786                                   _GL_ATTRIBUTE_PURE
 787                                   _GL_ARG_NONNULL ((1)));
 788 _GL_CXXALIAS_RPL (mbslen, size_t, (const char *string));
 789 # else
 790 _GL_FUNCDECL_SYS (mbslen, size_t, (const char *string)
 791                                   _GL_ATTRIBUTE_PURE
 792                                   _GL_ARG_NONNULL ((1)));
 793 _GL_CXXALIAS_SYS (mbslen, size_t, (const char *string));
 794 # endif
 795 _GL_CXXALIASWARN (mbslen);
 796 #endif
 797
 798 #if @GNULIB_MBSNLEN@
 799 /* Return the number of multibyte characters in the character string starting
 800    at STRING and ending at STRING + LEN.  */
 801 _GL_EXTERN_C size_t mbsnlen (const char *string, size_t len)
 802      _GL_ATTRIBUTE_PURE
 803      _GL_ARG_NONNULL ((1));
 804 #endif
 805
 806 #if @GNULIB_MBSCHR@
 807 /* Locate the first single-byte character C in the character string STRING,
 808    and return a pointer to it.  Return NULL if C is not found in STRING.
 809    Unlike strchr(), this function works correctly in multibyte locales with
 810    encodings such as GB18030.  */
 811 # if defined __hpux
 812 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 813 #   define mbschr rpl_mbschr /* avoid collision with HP-UX function */
 814 #  endif
 815 _GL_FUNCDECL_RPL (mbschr, char *, (const char *string, int c)
 816                                   _GL_ATTRIBUTE_PURE
 817                                   _GL_ARG_NONNULL ((1)));
 818 _GL_CXXALIAS_RPL (mbschr, char *, (const char *string, int c));
 819 # else
 820 _GL_FUNCDECL_SYS (mbschr, char *, (const char *string, int c)
 821                                   _GL_ATTRIBUTE_PURE
 822                                   _GL_ARG_NONNULL ((1)));
 823 _GL_CXXALIAS_SYS (mbschr, char *, (const char *string, int c));
 824 # endif
 825 _GL_CXXALIASWARN (mbschr);
 826 #endif
 827
 828 #if @GNULIB_MBSRCHR@
 829 /* Locate the last single-byte character C in the character string STRING,
 830    and return a pointer to it.  Return NULL if C is not found in STRING.
 831    Unlike strrchr(), this function works correctly in multibyte locales with
 832    encodings such as GB18030.  */
 833 # if defined __hpux || defined __INTERIX
 834 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 835 #   define mbsrchr rpl_mbsrchr /* avoid collision with system function */
 836 #  endif
 837 _GL_FUNCDECL_RPL (mbsrchr, char *, (const char *string, int c)
 838                                    _GL_ATTRIBUTE_PURE
 839                                    _GL_ARG_NONNULL ((1)));
 840 _GL_CXXALIAS_RPL (mbsrchr, char *, (const char *string, int c));
 841 # else
 842 _GL_FUNCDECL_SYS (mbsrchr, char *, (const char *string, int c)
 843                                    _GL_ATTRIBUTE_PURE
 844                                    _GL_ARG_NONNULL ((1)));
 845 _GL_CXXALIAS_SYS (mbsrchr, char *, (const char *string, int c));
 846 # endif
 847 _GL_CXXALIASWARN (mbsrchr);
 848 #endif
 849
 850 #if @GNULIB_MBSSTR@
 851 /* Find the first occurrence of the character string NEEDLE in the character
 852    string HAYSTACK.  Return NULL if NEEDLE is not found in HAYSTACK.
 853    Unlike strstr(), this function works correctly in multibyte locales with
 854    encodings different from UTF-8.  */
 855 _GL_EXTERN_C char * mbsstr (const char *haystack, const char *needle)
 856      _GL_ATTRIBUTE_PURE
 857      _GL_ARG_NONNULL ((1, 2));
 858 #endif
 859
 860 #if @GNULIB_MBSCASECMP@
 861 /* Compare the character strings S1 and S2, ignoring case, returning less than,
 862    equal to or greater than zero if S1 is lexicographically less than, equal to
 863    or greater than S2.
 864    Note: This function may, in multibyte locales, return 0 for strings of
 865    different lengths!
 866    Unlike strcasecmp(), this function works correctly in multibyte locales.  */
 867 _GL_EXTERN_C int mbscasecmp (const char *s1, const char *s2)
 868      _GL_ATTRIBUTE_PURE
 869      _GL_ARG_NONNULL ((1, 2));
 870 #endif
 871
 872 #if @GNULIB_MBSNCASECMP@
 873 /* Compare the initial segment of the character string S1 consisting of at most
 874    N characters with the initial segment of the character string S2 consisting
 875    of at most N characters, ignoring case, returning less than, equal to or
 876    greater than zero if the initial segment of S1 is lexicographically less
 877    than, equal to or greater than the initial segment of S2.
 878    Note: This function may, in multibyte locales, return 0 for initial segments
 879    of different lengths!
 880    Unlike strncasecmp(), this function works correctly in multibyte locales.
 881    But beware that N is not a byte count but a character count!  */
 882 _GL_EXTERN_C int mbsncasecmp (const char *s1, const char *s2, size_t n)
 883      _GL_ATTRIBUTE_PURE
 884      _GL_ARG_NONNULL ((1, 2));
 885 #endif
 886
 887 #if @GNULIB_MBSPCASECMP@
 888 /* Compare the initial segment of the character string STRING consisting of
 889    at most mbslen (PREFIX) characters with the character string PREFIX,
 890    ignoring case.  If the two match, return a pointer to the first byte
 891    after this prefix in STRING.  Otherwise, return NULL.
 892    Note: This function may, in multibyte locales, return non-NULL if STRING
 893    is of smaller length than PREFIX!
 894    Unlike strncasecmp(), this function works correctly in multibyte
 895    locales.  */
 896 _GL_EXTERN_C char * mbspcasecmp (const char *string, const char *prefix)
 897      _GL_ATTRIBUTE_PURE
 898      _GL_ARG_NONNULL ((1, 2));
 899 #endif
 900
 901 #if @GNULIB_MBSCASESTR@
 902 /* Find the first occurrence of the character string NEEDLE in the character
 903    string HAYSTACK, using case-insensitive comparison.
 904    Note: This function may, in multibyte locales, return success even if
 905    strlen (haystack) < strlen (needle) !
 906    Unlike strcasestr(), this function works correctly in multibyte locales.  */
 907 _GL_EXTERN_C char * mbscasestr (const char *haystack, const char *needle)
 908      _GL_ATTRIBUTE_PURE
 909      _GL_ARG_NONNULL ((1, 2));
 910 #endif
 911
 912 #if @GNULIB_MBSCSPN@
 913 /* Find the first occurrence in the character string STRING of any character
 914    in the character string ACCEPT.  Return the number of bytes from the
 915    beginning of the string to this occurrence, or to the end of the string
 916    if none exists.
 917    Unlike strcspn(), this function works correctly in multibyte locales.  */
 918 _GL_EXTERN_C size_t mbscspn (const char *string, const char *accept)
 919      _GL_ATTRIBUTE_PURE
 920      _GL_ARG_NONNULL ((1, 2));
 921 #endif
 922
 923 #if @GNULIB_MBSPBRK@
 924 /* Find the first occurrence in the character string STRING of any character
 925    in the character string ACCEPT.  Return the pointer to it, or NULL if none
 926    exists.
 927    Unlike strpbrk(), this function works correctly in multibyte locales.  */
 928 # if defined __hpux
 929 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 930 #   define mbspbrk rpl_mbspbrk /* avoid collision with HP-UX function */
 931 #  endif
 932 _GL_FUNCDECL_RPL (mbspbrk, char *, (const char *string, const char *accept)
 933                                    _GL_ATTRIBUTE_PURE
 934                                    _GL_ARG_NONNULL ((1, 2)));
 935 _GL_CXXALIAS_RPL (mbspbrk, char *, (const char *string, const char *accept));
 936 # else
 937 _GL_FUNCDECL_SYS (mbspbrk, char *, (const char *string, const char *accept)
 938                                    _GL_ATTRIBUTE_PURE
 939                                    _GL_ARG_NONNULL ((1, 2)));
 940 _GL_CXXALIAS_SYS (mbspbrk, char *, (const char *string, const char *accept));
 941 # endif
 942 _GL_CXXALIASWARN (mbspbrk);
 943 #endif
 944
 945 #if @GNULIB_MBSSPN@
 946 /* Find the first occurrence in the character string STRING of any character
 947    not in the character string REJECT.  Return the number of bytes from the
 948    beginning of the string to this occurrence, or to the end of the string
 949    if none exists.
 950    Unlike strspn(), this function works correctly in multibyte locales.  */
 951 _GL_EXTERN_C size_t mbsspn (const char *string, const char *reject)
 952      _GL_ATTRIBUTE_PURE
 953      _GL_ARG_NONNULL ((1, 2));
 954 #endif
 955
 956 #if @GNULIB_MBSSEP@
 957 /* Search the next delimiter (multibyte character listed in the character
 958    string DELIM) starting at the character string *STRINGP.
 959    If one is found, overwrite it with a NUL, and advance *STRINGP to point
 960    to the next multibyte character after it.  Otherwise, set *STRINGP to NULL.
 961    If *STRINGP was already NULL, nothing happens.
 962    Return the old value of *STRINGP.
 963
 964    This is a variant of mbstok_r() that supports empty fields.
 965
 966    Caveat: It modifies the original string.
 967    Caveat: These functions cannot be used on constant strings.
 968    Caveat: The identity of the delimiting character is lost.
 969
 970    See also mbstok_r().  */
 971 _GL_EXTERN_C char * mbssep (char **stringp, const char *delim)
 972      _GL_ARG_NONNULL ((1, 2));
 973 #endif
 974
 975 #if @GNULIB_MBSTOK_R@
 976 /* Parse the character string STRING into tokens separated by characters in
 977    the character string DELIM.
 978    If STRING is NULL, the saved pointer in SAVE_PTR is used as
 979    the next starting point.  For example:
 980         char s[] = "-abc-=-def";
 981         char *sp;
 982         x = mbstok_r(s, "-", &sp);      // x = "abc", sp = "=-def"
 983         x = mbstok_r(NULL, "-=", &sp);  // x = "def", sp = NULL
 984         x = mbstok_r(NULL, "=", &sp);   // x = NULL
 985                 // s = "abc\0-def\0"
 986
 987    Caveat: It modifies the original string.
 988    Caveat: These functions cannot be used on constant strings.
 989    Caveat: The identity of the delimiting character is lost.
 990
 991    See also mbssep().  */
 992 _GL_EXTERN_C char * mbstok_r (char *restrict string, const char *delim,
 993                               char **save_ptr)
 994      _GL_ARG_NONNULL ((2, 3));
 995 #endif
 996
 997 /* Map any int, typically from errno, into an error message.  */
 998 #if @GNULIB_STRERROR@
 999 # if @REPLACE_STRERROR@
1000 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1001 #   undef strerror
1002 #   define strerror rpl_strerror
1003 #  endif
1004 _GL_FUNCDECL_RPL (strerror, char *, (int));
1005 _GL_CXXALIAS_RPL (strerror, char *, (int));
1006 # else
1007 _GL_CXXALIAS_SYS (strerror, char *, (int));
1008 # endif
1009 # if __GLIBC__ >= 2
1010 _GL_CXXALIASWARN (strerror);
1011 # endif
1012 #elif defined GNULIB_POSIXCHECK
1013 # undef strerror
1014 /* Assume strerror is always declared.  */
1015 _GL_WARN_ON_USE (strerror, "strerror is unportable - "
1016                  "use gnulib module strerror to guarantee non-NULL result");
1017 #endif
1018
1019 /* Map any int, typically from errno, into an error message.  Multithread-safe.
1020    Uses the POSIX declaration, not the glibc declaration.  */
1021 #if @GNULIB_STRERROR_R@
1022 # if @REPLACE_STRERROR_R@
1023 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1024 #   undef strerror_r
1025 #   define strerror_r rpl_strerror_r
1026 #  endif
1027 _GL_FUNCDECL_RPL (strerror_r, int, (int errnum, char *buf, size_t buflen)
1028                                    _GL_ARG_NONNULL ((2)));
1029 _GL_CXXALIAS_RPL (strerror_r, int, (int errnum, char *buf, size_t buflen));
1030 # else
1031 #  if !@HAVE_DECL_STRERROR_R@
1032 _GL_FUNCDECL_SYS (strerror_r, int, (int errnum, char *buf, size_t buflen)
1033                                    _GL_ARG_NONNULL ((2)));
1034 #  endif
1035 _GL_CXXALIAS_SYS (strerror_r, int, (int errnum, char *buf, size_t buflen));
1036 # endif
1037 # if @HAVE_DECL_STRERROR_R@
1038 _GL_CXXALIASWARN (strerror_r);
1039 # endif
1040 #elif defined GNULIB_POSIXCHECK
1041 # undef strerror_r
1042 # if HAVE_RAW_DECL_STRERROR_R
1043 _GL_WARN_ON_USE (strerror_r, "strerror_r is unportable - "
1044                  "use gnulib module strerror_r-posix for portability");
1045 # endif
1046 #endif
1047
1048 /* Return the name of the system error code ERRNUM.  */
1049 #if @GNULIB_STRERRORNAME_NP@
1050 # if @REPLACE_STRERRORNAME_NP@
1051 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1052 #   undef strerrorname_np
1053 #   define strerrorname_np rpl_strerrorname_np
1054 #  endif
1055 _GL_FUNCDECL_RPL (strerrorname_np, const char *, (int errnum));
1056 _GL_CXXALIAS_RPL (strerrorname_np, const char *, (int errnum));
1057 # else
1058 #  if !@HAVE_STRERRORNAME_NP@
1059 _GL_FUNCDECL_SYS (strerrorname_np, const char *, (int errnum));
1060 #  endif
1061 _GL_CXXALIAS_SYS (strerrorname_np, const char *, (int errnum));
1062 # endif
1063 _GL_CXXALIASWARN (strerrorname_np);
1064 #elif defined GNULIB_POSIXCHECK
1065 # undef strerrorname_np
1066 # if HAVE_RAW_DECL_STRERRORNAME_NP
1067 _GL_WARN_ON_USE (strerrorname_np, "strerrorname_np is unportable - "
1068                  "use gnulib module strerrorname_np for portability");
1069 # endif
1070 #endif
1071
1072 /* Return an abbreviation string for the signal number SIG.  */
1073 #if @GNULIB_SIGABBREV_NP@
1074 # if ! @HAVE_SIGABBREV_NP@
1075 _GL_FUNCDECL_SYS (sigabbrev_np, const char *, (int sig));
1076 # endif
1077 _GL_CXXALIAS_SYS (sigabbrev_np, const char *, (int sig));
1078 _GL_CXXALIASWARN (sigabbrev_np);
1079 #elif defined GNULIB_POSIXCHECK
1080 # undef sigabbrev_np
1081 # if HAVE_RAW_DECL_SIGABBREV_NP
1082 _GL_WARN_ON_USE (sigabbrev_np, "sigabbrev_np is unportable - "
1083                  "use gnulib module sigabbrev_np for portability");
1084 # endif
1085 #endif
1086
1087 /* Return an English description string for the signal number SIG.  */
1088 #if @GNULIB_SIGDESCR_NP@
1089 # if ! @HAVE_SIGDESCR_NP@
1090 _GL_FUNCDECL_SYS (sigdescr_np, const char *, (int sig));
1091 # endif
1092 _GL_CXXALIAS_SYS (sigdescr_np, const char *, (int sig));
1093 _GL_CXXALIASWARN (sigdescr_np);
1094 #elif defined GNULIB_POSIXCHECK
1095 # undef sigdescr_np
1096 # if HAVE_RAW_DECL_SIGDESCR_NP
1097 _GL_WARN_ON_USE (sigdescr_np, "sigdescr_np is unportable - "
1098                  "use gnulib module sigdescr_np for portability");
1099 # endif
1100 #endif
1101
1102 #if @GNULIB_STRSIGNAL@
1103 # if @REPLACE_STRSIGNAL@
1104 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1105 #   define strsignal rpl_strsignal
1106 #  endif
1107 _GL_FUNCDECL_RPL (strsignal, char *, (int __sig));
1108 _GL_CXXALIAS_RPL (strsignal, char *, (int __sig));
1109 # else
1110 #  if ! @HAVE_DECL_STRSIGNAL@
1111 _GL_FUNCDECL_SYS (strsignal, char *, (int __sig));
1112 #  endif
1113 /* Need to cast, because on Cygwin 1.5.x systems, the return type is
1114    'const char *'.  */
1115 _GL_CXXALIAS_SYS_CAST (strsignal, char *, (int __sig));
1116 # endif
1117 _GL_CXXALIASWARN (strsignal);
1118 #elif defined GNULIB_POSIXCHECK
1119 # undef strsignal
1120 # if HAVE_RAW_DECL_STRSIGNAL
1121 _GL_WARN_ON_USE (strsignal, "strsignal is unportable - "
1122                  "use gnulib module strsignal for portability");
1123 # endif
1124 #endif
1125
1126 #if @GNULIB_STRVERSCMP@
1127 # if !@HAVE_STRVERSCMP@
1128 _GL_FUNCDECL_SYS (strverscmp, int, (const char *, const char *)
1129                                    _GL_ATTRIBUTE_PURE
1130                                    _GL_ARG_NONNULL ((1, 2)));
1131 # endif
1132 _GL_CXXALIAS_SYS (strverscmp, int, (const char *, const char *));
1133 _GL_CXXALIASWARN (strverscmp);
1134 #elif defined GNULIB_POSIXCHECK
1135 # undef strverscmp
1136 # if HAVE_RAW_DECL_STRVERSCMP
1137 _GL_WARN_ON_USE (strverscmp, "strverscmp is unportable - "
1138                  "use gnulib module strverscmp for portability");
1139 # endif
1140 #endif
1141
1142
1143 #endif /* _@GUARD_PREFIX@_STRING_H */
1144 #endif /* _@GUARD_PREFIX@_STRING_H */
1145 #endif