/* A GNU-like <string.h>.

   Copyright (C) 1995-1996, 2001-2018 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, see <https://www.gnu.org/licenses/>.  */

#if __GNUC__ >= 3

@PRAGMA_SYSTEM_HEADER@

#endif

@PRAGMA_COLUMNS@

#if defined _GL_ALREADY_INCLUDING_STRING_H

/* Special invocation convention:

   - On OS X/NetBSD we have a sequence of nested includes

       <string.h> -> <strings.h> -> "string.h"

     In this situation system _chk variants due to -D_FORTIFY_SOURCE

     might be used after any replacements defined here.  */

#@INCLUDE_NEXT@ @NEXT_STRING_H@

#else

/* Normal invocation convention.  */

#ifndef _@GUARD_PREFIX@_STRING_H

#define _GL_ALREADY_INCLUDING_STRING_H

/* The include_next requires a split double-inclusion guard.  */

#@INCLUDE_NEXT@ @NEXT_STRING_H@

#undef _GL_ALREADY_INCLUDING_STRING_H

#ifndef _@GUARD_PREFIX@_STRING_H

#define _@GUARD_PREFIX@_STRING_H

/* NetBSD 5.0 mis-defines NULL.  */

#include <stddef.h>

/* MirBSD defines mbslen as a macro.  */

#if @GNULIB_MBSLEN@ && defined __MirBSD__

# include <wchar.h>

#endif

/* The __attribute__ feature is available in gcc versions 2.5 and later.

   The attribute __pure__ was added in gcc 2.96.  */

#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)

# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))

#else

# define _GL_ATTRIBUTE_PURE /* empty */

#endif

/* NetBSD 5.0 declares strsignal in <unistd.h>, not in <string.h>.  */

/* But in any case avoid namespace pollution on glibc systems.  */

#if (@GNULIB_STRSIGNAL@ || defined GNULIB_POSIXCHECK) && defined __NetBSD__ \

    && ! defined __GLIBC__

# include <unistd.h>

#endif

/* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */

/* The definition of _GL_ARG_NONNULL is copied here.  */

/* The definition of _GL_WARN_ON_USE is copied here.  */

/* Clear a block of memory.  The compiler will not delete a call to

   this function, even if the block is dead after the call.  */

#if @GNULIB_EXPLICIT_BZERO@

# if ! @HAVE_EXPLICIT_BZERO@

_GL_FUNCDECL_SYS (explicit_bzero, void,

                  (void *__dest, size_t __n) _GL_ARG_NONNULL ((1)));

# endif

_GL_CXXALIAS_SYS (explicit_bzero, void, (void *__dest, size_t __n));

_GL_CXXALIASWARN (explicit_bzero);

#elif defined GNULIB_POSIXCHECK

# undef explicit_bzero

# if HAVE_RAW_DECL_EXPLICIT_BZERO

_GL_WARN_ON_USE (explicit_bzero, "explicit_bzero is unportable - "

                 "use gnulib module explicit_bzero for portability");

# endif

#endif

/* Find the index of the least-significant set bit.  */

#if @GNULIB_FFSL@

# if !@HAVE_FFSL@

_GL_FUNCDECL_SYS (ffsl, int, (long int i));

# endif

_GL_CXXALIAS_SYS (ffsl, int, (long int i));

_GL_CXXALIASWARN (ffsl);

#elif defined GNULIB_POSIXCHECK

# undef ffsl

# if HAVE_RAW_DECL_FFSL

_GL_WARN_ON_USE (ffsl, "ffsl is not portable - use the ffsl module");

# endif

#endif

/* Find the index of the least-significant set bit.  */

#if @GNULIB_FFSLL@

# if !@HAVE_FFSLL@

_GL_FUNCDECL_SYS (ffsll, int, (long long int i));

# endif

_GL_CXXALIAS_SYS (ffsll, int, (long long int i));

_GL_CXXALIASWARN (ffsll);

#elif defined GNULIB_POSIXCHECK

# undef ffsll

# if HAVE_RAW_DECL_FFSLL

_GL_WARN_ON_USE (ffsll, "ffsll is not portable - use the ffsll module");

# endif

#endif

/* Return the first instance of C within N bytes of S, or NULL.  */

#if @GNULIB_MEMCHR@

# if @REPLACE_MEMCHR@

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   define memchr rpl_memchr

#  endif

_GL_FUNCDECL_RPL (memchr, void *, (void const *__s, int __c, size_t __n)

                                  _GL_ATTRIBUTE_PURE

                                  _GL_ARG_NONNULL ((1)));

_GL_CXXALIAS_RPL (memchr, void *, (void const *__s, int __c, size_t __n));

# else

#  if ! @HAVE_MEMCHR@

_GL_FUNCDECL_SYS (memchr, void *, (void const *__s, int __c, size_t __n)

                                  _GL_ATTRIBUTE_PURE

                                  _GL_ARG_NONNULL ((1)));

#  endif

  /* On some systems, this function is defined as an overloaded function:

       extern "C" { const void * std::memchr (const void *, int, size_t); }

       extern "C++" { void * std::memchr (void *, int, size_t); }  */

_GL_CXXALIAS_SYS_CAST2 (memchr,

                        void *, (void const *__s, int __c, size_t __n),

                        void const *, (void const *__s, int __c, size_t __n));

# endif

# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \

     && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))

_GL_CXXALIASWARN1 (memchr, void *, (void *__s, int __c, size_t __n));

_GL_CXXALIASWARN1 (memchr, void const *,

                   (void const *__s, int __c, size_t __n));

# else

_GL_CXXALIASWARN (memchr);

# endif

#elif defined GNULIB_POSIXCHECK

# undef memchr

/* Assume memchr is always declared.  */

_GL_WARN_ON_USE (memchr, "memchr has platform-specific bugs - "

                 "use gnulib module memchr for portability" );

#endif

/* Return the first occurrence of NEEDLE in HAYSTACK.  */

#if @GNULIB_MEMMEM@

# if @REPLACE_MEMMEM@

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   define memmem rpl_memmem

#  endif

_GL_FUNCDECL_RPL (memmem, void *,

                  (void const *__haystack, size_t __haystack_len,

                   void const *__needle, size_t __needle_len)

                  _GL_ATTRIBUTE_PURE

                  _GL_ARG_NONNULL ((1, 3)));

_GL_CXXALIAS_RPL (memmem, void *,

                  (void const *__haystack, size_t __haystack_len,

                   void const *__needle, size_t __needle_len));

# else

#  if ! @HAVE_DECL_MEMMEM@

_GL_FUNCDECL_SYS (memmem, void *,

                  (void const *__haystack, size_t __haystack_len,

                   void const *__needle, size_t __needle_len)

                  _GL_ATTRIBUTE_PURE

                  _GL_ARG_NONNULL ((1, 3)));

#  endif

_GL_CXXALIAS_SYS (memmem, void *,

                  (void const *__haystack, size_t __haystack_len,

                   void const *__needle, size_t __needle_len));

# endif

_GL_CXXALIASWARN (memmem);

#elif defined GNULIB_POSIXCHECK

# undef memmem

# if HAVE_RAW_DECL_MEMMEM

_GL_WARN_ON_USE (memmem, "memmem is unportable and often quadratic - "

                 "use gnulib module memmem-simple for portability, "

                 "and module memmem for speed" );

# endif

#endif

/* Copy N bytes of SRC to DEST, return pointer to bytes after the

   last written byte.  */

#if @GNULIB_MEMPCPY@

# if ! @HAVE_MEMPCPY@

_GL_FUNCDECL_SYS (mempcpy, void *,

                  (void *restrict __dest, void const *restrict __src,

                   size_t __n)

                  _GL_ARG_NONNULL ((1, 2)));

# endif

_GL_CXXALIAS_SYS (mempcpy, void *,

                  (void *restrict __dest, void const *restrict __src,

                   size_t __n));

_GL_CXXALIASWARN (mempcpy);

#elif defined GNULIB_POSIXCHECK

# undef mempcpy

# if HAVE_RAW_DECL_MEMPCPY

_GL_WARN_ON_USE (mempcpy, "mempcpy is unportable - "

                 "use gnulib module mempcpy for portability");

# endif

#endif

/* Search backwards through a block for a byte (specified as an int).  */

#if @GNULIB_MEMRCHR@

# if ! @HAVE_DECL_MEMRCHR@

_GL_FUNCDECL_SYS (memrchr, void *, (void const *, int, size_t)

                                   _GL_ATTRIBUTE_PURE

                                   _GL_ARG_NONNULL ((1)));

# endif

  /* On some systems, this function is defined as an overloaded function:

       extern "C++" { const void * std::memrchr (const void *, int, size_t); }

       extern "C++" { void * std::memrchr (void *, int, size_t); }  */

_GL_CXXALIAS_SYS_CAST2 (memrchr,

                        void *, (void const *, int, size_t),

                        void const *, (void const *, int, size_t));

# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \

     && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))

_GL_CXXALIASWARN1 (memrchr, void *, (void *, int, size_t));

_GL_CXXALIASWARN1 (memrchr, void const *, (void const *, int, size_t));

# else

_GL_CXXALIASWARN (memrchr);

# endif

#elif defined GNULIB_POSIXCHECK

# undef memrchr

# if HAVE_RAW_DECL_MEMRCHR

_GL_WARN_ON_USE (memrchr, "memrchr is unportable - "

                 "use gnulib module memrchr for portability");

# endif

#endif

/* Find the first occurrence of C in S.  More efficient than

   memchr(S,C,N), at the expense of undefined behavior if C does not

   occur within N bytes.  */

#if @GNULIB_RAWMEMCHR@

# if ! @HAVE_RAWMEMCHR@

_GL_FUNCDECL_SYS (rawmemchr, void *, (void const *__s, int __c_in)

                                     _GL_ATTRIBUTE_PURE

                                     _GL_ARG_NONNULL ((1)));

# endif

  /* On some systems, this function is defined as an overloaded function:

       extern "C++" { const void * std::rawmemchr (const void *, int); }

       extern "C++" { void * std::rawmemchr (void *, int); }  */

_GL_CXXALIAS_SYS_CAST2 (rawmemchr,

                        void *, (void const *__s, int __c_in),

                        void const *, (void const *__s, int __c_in));

# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \

     && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))

_GL_CXXALIASWARN1 (rawmemchr, void *, (void *__s, int __c_in));

_GL_CXXALIASWARN1 (rawmemchr, void const *, (void const *__s, int __c_in));

# else

_GL_CXXALIASWARN (rawmemchr);

# endif

#elif defined GNULIB_POSIXCHECK

# undef rawmemchr

# if HAVE_RAW_DECL_RAWMEMCHR

_GL_WARN_ON_USE (rawmemchr, "rawmemchr is unportable - "

                 "use gnulib module rawmemchr for portability");

# endif

#endif

/* Copy SRC to DST, returning the address of the terminating '\0' in DST.  */

#if @GNULIB_STPCPY@

# if ! @HAVE_STPCPY@

_GL_FUNCDECL_SYS (stpcpy, char *,

                  (char *restrict __dst, char const *restrict __src)

                  _GL_ARG_NONNULL ((1, 2)));

# endif

_GL_CXXALIAS_SYS (stpcpy, char *,

                  (char *restrict __dst, char const *restrict __src));

_GL_CXXALIASWARN (stpcpy);

#elif defined GNULIB_POSIXCHECK

# undef stpcpy

# if HAVE_RAW_DECL_STPCPY

_GL_WARN_ON_USE (stpcpy, "stpcpy is unportable - "

                 "use gnulib module stpcpy for portability");

# endif

#endif

/* Copy no more than N bytes of SRC to DST, returning a pointer past the

   last non-NUL byte written into DST.  */

#if @GNULIB_STPNCPY@

# if @REPLACE_STPNCPY@

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   undef stpncpy

#   define stpncpy rpl_stpncpy

#  endif

_GL_FUNCDECL_RPL (stpncpy, char *,

                  (char *restrict __dst, char const *restrict __src,

                   size_t __n)

                  _GL_ARG_NONNULL ((1, 2)));

_GL_CXXALIAS_RPL (stpncpy, char *,

                  (char *restrict __dst, char const *restrict __src,

                   size_t __n));

# else

#  if ! @HAVE_STPNCPY@

_GL_FUNCDECL_SYS (stpncpy, char *,

                  (char *restrict __dst, char const *restrict __src,

                   size_t __n)

                  _GL_ARG_NONNULL ((1, 2)));

#  endif

_GL_CXXALIAS_SYS (stpncpy, char *,

                  (char *restrict __dst, char const *restrict __src,

                   size_t __n));

# endif

_GL_CXXALIASWARN (stpncpy);

#elif defined GNULIB_POSIXCHECK

# undef stpncpy

# if HAVE_RAW_DECL_STPNCPY

_GL_WARN_ON_USE (stpncpy, "stpncpy is unportable - "

                 "use gnulib module stpncpy for portability");

# endif

#endif

#if defined GNULIB_POSIXCHECK

/* strchr() does not work with multibyte strings if the locale encoding is

   GB18030 and the character to be searched is a digit.  */

# undef strchr

/* Assume strchr is always declared.  */

_GL_WARN_ON_USE (strchr, "strchr cannot work correctly on character strings "

                 "in some multibyte locales - "

                 "use mbschr if you care about internationalization");

#endif

/* Find the first occurrence of C in S or the final NUL byte.  */

#if @GNULIB_STRCHRNUL@

# if @REPLACE_STRCHRNUL@

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   define strchrnul rpl_strchrnul

#  endif

_GL_FUNCDECL_RPL (strchrnul, char *, (const char *__s, int __c_in)

                                     _GL_ATTRIBUTE_PURE

                                     _GL_ARG_NONNULL ((1)));

_GL_CXXALIAS_RPL (strchrnul, char *,

                  (const char *str, int ch));

# else

#  if ! @HAVE_STRCHRNUL@

_GL_FUNCDECL_SYS (strchrnul, char *, (char const *__s, int __c_in)

                                     _GL_ATTRIBUTE_PURE

                                     _GL_ARG_NONNULL ((1)));

#  endif

  /* On some systems, this function is defined as an overloaded function:

       extern "C++" { const char * std::strchrnul (const char *, int); }

       extern "C++" { char * std::strchrnul (char *, int); }  */

_GL_CXXALIAS_SYS_CAST2 (strchrnul,

                        char *, (char const *__s, int __c_in),

                        char const *, (char const *__s, int __c_in));

# endif

# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \

     && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))

_GL_CXXALIASWARN1 (strchrnul, char *, (char *__s, int __c_in));

_GL_CXXALIASWARN1 (strchrnul, char const *, (char const *__s, int __c_in));

# else

_GL_CXXALIASWARN (strchrnul);

# endif

#elif defined GNULIB_POSIXCHECK

# undef strchrnul

# if HAVE_RAW_DECL_STRCHRNUL

_GL_WARN_ON_USE (strchrnul, "strchrnul is unportable - "

                 "use gnulib module strchrnul for portability");

# endif

#endif

/* Duplicate S, returning an identical malloc'd string.  */

#if @GNULIB_STRDUP@

# if @REPLACE_STRDUP@

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   undef strdup

#   define strdup rpl_strdup

#  endif

_GL_FUNCDECL_RPL (strdup, char *, (char const *__s) _GL_ARG_NONNULL ((1)));

_GL_CXXALIAS_RPL (strdup, char *, (char const *__s));

# else

#  if defined __cplusplus && defined GNULIB_NAMESPACE && defined strdup

    /* strdup exists as a function and as a macro.  Get rid of the macro.  */

#   undef strdup

#  endif

#  if !(@HAVE_DECL_STRDUP@ || defined strdup)

_GL_FUNCDECL_SYS (strdup, char *, (char const *__s) _GL_ARG_NONNULL ((1)));

#  endif

_GL_CXXALIAS_SYS (strdup, char *, (char const *__s));

# endif

_GL_CXXALIASWARN (strdup);

#elif defined GNULIB_POSIXCHECK

# undef strdup

# if HAVE_RAW_DECL_STRDUP

_GL_WARN_ON_USE (strdup, "strdup is unportable - "

                 "use gnulib module strdup for portability");

# endif

#endif

/* Append no more than N characters from SRC onto DEST.  */

#if @GNULIB_STRNCAT@

# if @REPLACE_STRNCAT@

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   undef strncat

#   define strncat rpl_strncat

#  endif

_GL_FUNCDECL_RPL (strncat, char *, (char *dest, const char *src, size_t n)

                                   _GL_ARG_NONNULL ((1, 2)));

_GL_CXXALIAS_RPL (strncat, char *, (char *dest, const char *src, size_t n));

# else

_GL_CXXALIAS_SYS (strncat, char *, (char *dest, const char *src, size_t n));

# endif

_GL_CXXALIASWARN (strncat);

#elif defined GNULIB_POSIXCHECK

# undef strncat

# if HAVE_RAW_DECL_STRNCAT

_GL_WARN_ON_USE (strncat, "strncat is unportable - "

                 "use gnulib module strncat for portability");

# endif

#endif

/* Return a newly allocated copy of at most N bytes of STRING.  */

#if @GNULIB_STRNDUP@

# if @REPLACE_STRNDUP@

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   undef strndup

#   define strndup rpl_strndup

#  endif

_GL_FUNCDECL_RPL (strndup, char *, (char const *__s, size_t __n)

                                   _GL_ARG_NONNULL ((1)));

_GL_CXXALIAS_RPL (strndup, char *, (char const *__s, size_t __n));

# else

#  if ! @HAVE_DECL_STRNDUP@

_GL_FUNCDECL_SYS (strndup, char *, (char const *__s, size_t __n)

                                   _GL_ARG_NONNULL ((1)));

#  endif

_GL_CXXALIAS_SYS (strndup, char *, (char const *__s, size_t __n));

# endif

_GL_CXXALIASWARN (strndup);

#elif defined GNULIB_POSIXCHECK

# undef strndup

# if HAVE_RAW_DECL_STRNDUP

_GL_WARN_ON_USE (strndup, "strndup is unportable - "

                 "use gnulib module strndup for portability");

# endif

#endif

/* Find the length (number of bytes) of STRING, but scan at most

   MAXLEN bytes.  If no '\0' terminator is found in that many bytes,

   return MAXLEN.  */

#if @GNULIB_STRNLEN@

# if @REPLACE_STRNLEN@

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   undef strnlen

#   define strnlen rpl_strnlen

#  endif

_GL_FUNCDECL_RPL (strnlen, size_t, (char const *__s, size_t __maxlen)

                                   _GL_ATTRIBUTE_PURE

                                   _GL_ARG_NONNULL ((1)));

_GL_CXXALIAS_RPL (strnlen, size_t, (char const *__s, size_t __maxlen));

# else

#  if ! @HAVE_DECL_STRNLEN@

_GL_FUNCDECL_SYS (strnlen, size_t, (char const *__s, size_t __maxlen)

                                   _GL_ATTRIBUTE_PURE

                                   _GL_ARG_NONNULL ((1)));

#  endif

_GL_CXXALIAS_SYS (strnlen, size_t, (char const *__s, size_t __maxlen));

# endif

_GL_CXXALIASWARN (strnlen);

#elif defined GNULIB_POSIXCHECK

# undef strnlen

# if HAVE_RAW_DECL_STRNLEN

_GL_WARN_ON_USE (strnlen, "strnlen is unportable - "

                 "use gnulib module strnlen for portability");

# endif

#endif

#if defined GNULIB_POSIXCHECK

/* strcspn() assumes the second argument is a list of single-byte characters.

   Even in this simple case, it does not work with multibyte strings if the

   locale encoding is GB18030 and one of the characters to be searched is a

   digit.  */

# undef strcspn

/* Assume strcspn is always declared.  */

_GL_WARN_ON_USE (strcspn, "strcspn cannot work correctly on character strings "

                 "in multibyte locales - "

                 "use mbscspn if you care about internationalization");

#endif

/* Find the first occurrence in S of any character in ACCEPT.  */

#if @GNULIB_STRPBRK@

# if ! @HAVE_STRPBRK@

_GL_FUNCDECL_SYS (strpbrk, char *, (char const *__s, char const *__accept)

                                   _GL_ATTRIBUTE_PURE

                                   _GL_ARG_NONNULL ((1, 2)));

# endif

  /* On some systems, this function is defined as an overloaded function:

       extern "C" { const char * strpbrk (const char *, const char *); }

       extern "C++" { char * strpbrk (char *, const char *); }  */

_GL_CXXALIAS_SYS_CAST2 (strpbrk,

                        char *, (char const *__s, char const *__accept),

                        const char *, (char const *__s, char const *__accept));

# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \

     && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))

_GL_CXXALIASWARN1 (strpbrk, char *, (char *__s, char const *__accept));

_GL_CXXALIASWARN1 (strpbrk, char const *,

                   (char const *__s, char const *__accept));

# else

_GL_CXXALIASWARN (strpbrk);

# endif

# if defined GNULIB_POSIXCHECK

/* strpbrk() assumes the second argument is a list of single-byte characters.

   Even in this simple case, it does not work with multibyte strings if the

   locale encoding is GB18030 and one of the characters to be searched is a

   digit.  */

#  undef strpbrk

_GL_WARN_ON_USE (strpbrk, "strpbrk cannot work correctly on character strings "

                 "in multibyte locales - "

                 "use mbspbrk if you care about internationalization");

# endif

#elif defined GNULIB_POSIXCHECK

# undef strpbrk

# if HAVE_RAW_DECL_STRPBRK

_GL_WARN_ON_USE (strpbrk, "strpbrk is unportable - "

                 "use gnulib module strpbrk for portability");

# endif

#endif

#if defined GNULIB_POSIXCHECK

/* strspn() assumes the second argument is a list of single-byte characters.

   Even in this simple case, it cannot work with multibyte strings.  */

# undef strspn

/* Assume strspn is always declared.  */

_GL_WARN_ON_USE (strspn, "strspn cannot work correctly on character strings "

                 "in multibyte locales - "

                 "use mbsspn if you care about internationalization");

#endif

#if defined GNULIB_POSIXCHECK

/* strrchr() does not work with multibyte strings if the locale encoding is

   GB18030 and the character to be searched is a digit.  */

# undef strrchr

/* Assume strrchr is always declared.  */

_GL_WARN_ON_USE (strrchr, "strrchr cannot work correctly on character strings "

                 "in some multibyte locales - "

                 "use mbsrchr if you care about internationalization");

#endif

/* Search the next delimiter (char listed in DELIM) starting at *STRINGP.

   If one is found, overwrite it with a NUL, and advance *STRINGP

   to point to the next char after it.  Otherwise, set *STRINGP to NULL.

   If *STRINGP was already NULL, nothing happens.

   Return the old value of *STRINGP.

   This is a variant of strtok() that is multithread-safe and supports

   empty fields.

   Caveat: It modifies the original string.

   Caveat: These functions cannot be used on constant strings.

   Caveat: The identity of the delimiting character is lost.

   Caveat: It doesn't work with multibyte strings unless all of the delimiter

           characters are ASCII characters < 0x30.

   See also strtok_r().  */

#if @GNULIB_STRSEP@

# if ! @HAVE_STRSEP@

_GL_FUNCDECL_SYS (strsep, char *,

                  (char **restrict __stringp, char const *restrict __delim)

                  _GL_ARG_NONNULL ((1, 2)));

# endif

_GL_CXXALIAS_SYS (strsep, char *,

                  (char **restrict __stringp, char const *restrict __delim));

_GL_CXXALIASWARN (strsep);

# if defined GNULIB_POSIXCHECK

#  undef strsep

_GL_WARN_ON_USE (strsep, "strsep cannot work correctly on character strings "

                 "in multibyte locales - "

                 "use mbssep if you care about internationalization");

# endif

#elif defined GNULIB_POSIXCHECK

# undef strsep

# if HAVE_RAW_DECL_STRSEP

_GL_WARN_ON_USE (strsep, "strsep is unportable - "

                 "use gnulib module strsep for portability");

# endif

#endif

#if @GNULIB_STRSTR@

# if @REPLACE_STRSTR@

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   define strstr rpl_strstr

#  endif

_GL_FUNCDECL_RPL (strstr, char *, (const char *haystack, const char *needle)

                                  _GL_ATTRIBUTE_PURE

                                  _GL_ARG_NONNULL ((1, 2)));

_GL_CXXALIAS_RPL (strstr, char *, (const char *haystack, const char *needle));

# else

  /* On some systems, this function is defined as an overloaded function:

       extern "C++" { const char * strstr (const char *, const char *); }

       extern "C++" { char * strstr (char *, const char *); }  */

_GL_CXXALIAS_SYS_CAST2 (strstr,

                        char *, (const char *haystack, const char *needle),

                        const char *, (const char *haystack, const char *needle));

# endif

# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \

     && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))

_GL_CXXALIASWARN1 (strstr, char *, (char *haystack, const char *needle));

_GL_CXXALIASWARN1 (strstr, const char *,

                   (const char *haystack, const char *needle));

# else

_GL_CXXALIASWARN (strstr);

# endif

#elif defined GNULIB_POSIXCHECK

/* strstr() does not work with multibyte strings if the locale encoding is

   different from UTF-8:

   POSIX says that it operates on "strings", and "string" in POSIX is defined

   as a sequence of bytes, not of characters.  */

# undef strstr

/* Assume strstr is always declared.  */

_GL_WARN_ON_USE (strstr, "strstr is quadratic on many systems, and cannot "

                 "work correctly on character strings in most "

                 "multibyte locales - "

                 "use mbsstr if you care about internationalization, "

                 "or use strstr if you care about speed");

#endif

/* Find the first occurrence of NEEDLE in HAYSTACK, using case-insensitive

   comparison.  */

#if @GNULIB_STRCASESTR@

# if @REPLACE_STRCASESTR@

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   define strcasestr rpl_strcasestr

#  endif

_GL_FUNCDECL_RPL (strcasestr, char *,

                  (const char *haystack, const char *needle)

                  _GL_ATTRIBUTE_PURE

                  _GL_ARG_NONNULL ((1, 2)));

_GL_CXXALIAS_RPL (strcasestr, char *,

                  (const char *haystack, const char *needle));

# else

#  if ! @HAVE_STRCASESTR@

_GL_FUNCDECL_SYS (strcasestr, char *,

                  (const char *haystack, const char *needle)

                  _GL_ATTRIBUTE_PURE

                  _GL_ARG_NONNULL ((1, 2)));

#  endif

  /* On some systems, this function is defined as an overloaded function:

       extern "C++" { const char * strcasestr (const char *, const char *); }

       extern "C++" { char * strcasestr (char *, const char *); }  */

_GL_CXXALIAS_SYS_CAST2 (strcasestr,

                        char *, (const char *haystack, const char *needle),

                        const char *, (const char *haystack, const char *needle));

# endif

# if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 10) && !defined __UCLIBC__) \

     && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))

_GL_CXXALIASWARN1 (strcasestr, char *, (char *haystack, const char *needle));

_GL_CXXALIASWARN1 (strcasestr, const char *,

                   (const char *haystack, const char *needle));

# else

_GL_CXXALIASWARN (strcasestr);

# endif

#elif defined GNULIB_POSIXCHECK

/* strcasestr() does not work with multibyte strings:

   It is a glibc extension, and glibc implements it only for unibyte

   locales.  */

# undef strcasestr

# if HAVE_RAW_DECL_STRCASESTR

_GL_WARN_ON_USE (strcasestr, "strcasestr does work correctly on character "

                 "strings in multibyte locales - "

                 "use mbscasestr if you care about "

                 "internationalization, or use c-strcasestr if you want "

                 "a locale independent function");

# endif

#endif

/* Parse S into tokens separated by characters in DELIM.

   If S is NULL, the saved pointer in SAVE_PTR is used as

   the next starting point.  For example:

        char s[] = "-abc-=-def";

        char *sp;

        x = strtok_r(s, "-", &sp);      // x = "abc", sp = "=-def"

        x = strtok_r(NULL, "-=", &sp);  // x = "def", sp = NULL

        x = strtok_r(NULL, "=", &sp);   // x = NULL

                // s = "abc\0-def\0"

   This is a variant of strtok() that is multithread-safe.

   For the POSIX documentation for this function, see:

   http://www.opengroup.org/susv3xsh/strtok.html

   Caveat: It modifies the original string.

   Caveat: These functions cannot be used on constant strings.

   Caveat: The identity of the delimiting character is lost.

   Caveat: It doesn't work with multibyte strings unless all of the delimiter

           characters are ASCII characters < 0x30.

   See also strsep().  */

#if @GNULIB_STRTOK_R@

# if @REPLACE_STRTOK_R@

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   undef strtok_r

#   define strtok_r rpl_strtok_r

#  endif

_GL_FUNCDECL_RPL (strtok_r, char *,

                  (char *restrict s, char const *restrict delim,

                   char **restrict save_ptr)

                  _GL_ARG_NONNULL ((2, 3)));

_GL_CXXALIAS_RPL (strtok_r, char *,

                  (char *restrict s, char const *restrict delim,

                   char **restrict save_ptr));

# else

#  if @UNDEFINE_STRTOK_R@ || defined GNULIB_POSIXCHECK

#   undef strtok_r

#  endif

#  if ! @HAVE_DECL_STRTOK_R@

_GL_FUNCDECL_SYS (strtok_r, char *,

                  (char *restrict s, char const *restrict delim,

                   char **restrict save_ptr)

                  _GL_ARG_NONNULL ((2, 3)));

#  endif

_GL_CXXALIAS_SYS (strtok_r, char *,

                  (char *restrict s, char const *restrict delim,

                   char **restrict save_ptr));

# endif

_GL_CXXALIASWARN (strtok_r);

# if defined GNULIB_POSIXCHECK

_GL_WARN_ON_USE (strtok_r, "strtok_r cannot work correctly on character "

                 "strings in multibyte locales - "

                 "use mbstok_r if you care about internationalization");

# endif

#elif defined GNULIB_POSIXCHECK

# undef strtok_r

# if HAVE_RAW_DECL_STRTOK_R

_GL_WARN_ON_USE (strtok_r, "strtok_r is unportable - "

                 "use gnulib module strtok_r for portability");

# endif

#endif

/* The following functions are not specified by POSIX.  They are gnulib

   extensions.  */

#if @GNULIB_MBSLEN@

/* Return the number of multibyte characters in the character string STRING.

   This considers multibyte characters, unlike strlen, which counts bytes.  */

# ifdef __MirBSD__  /* MirBSD defines mbslen as a macro.  Override it.  */

#  undef mbslen

# endif

# if @HAVE_MBSLEN@  /* AIX, OSF/1, MirBSD define mbslen already in libc.  */

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   define mbslen rpl_mbslen

#  endif

_GL_FUNCDECL_RPL (mbslen, size_t, (const char *string)

                                  _GL_ATTRIBUTE_PURE

                                  _GL_ARG_NONNULL ((1)));

_GL_CXXALIAS_RPL (mbslen, size_t, (const char *string));

# else

_GL_FUNCDECL_SYS (mbslen, size_t, (const char *string)

                                  _GL_ATTRIBUTE_PURE

                                  _GL_ARG_NONNULL ((1)));

_GL_CXXALIAS_SYS (mbslen, size_t, (const char *string));

# endif

_GL_CXXALIASWARN (mbslen);

#endif

#if @GNULIB_MBSNLEN@

/* Return the number of multibyte characters in the character string starting

   at STRING and ending at STRING + LEN.  */

_GL_EXTERN_C size_t mbsnlen (const char *string, size_t len)

     _GL_ATTRIBUTE_PURE

     _GL_ARG_NONNULL ((1));

#endif

#if @GNULIB_MBSCHR@

/* Locate the first single-byte character C in the character string STRING,

   and return a pointer to it.  Return NULL if C is not found in STRING.

   Unlike strchr(), this function works correctly in multibyte locales with

   encodings such as GB18030.  */

# if defined __hpux

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   define mbschr rpl_mbschr /* avoid collision with HP-UX function */

#  endif

_GL_FUNCDECL_RPL (mbschr, char *, (const char *string, int c)

                                  _GL_ATTRIBUTE_PURE

                                  _GL_ARG_NONNULL ((1)));

_GL_CXXALIAS_RPL (mbschr, char *, (const char *string, int c));

# else

_GL_FUNCDECL_SYS (mbschr, char *, (const char *string, int c)

                                  _GL_ATTRIBUTE_PURE

                                  _GL_ARG_NONNULL ((1)));

_GL_CXXALIAS_SYS (mbschr, char *, (const char *string, int c));

# endif

_GL_CXXALIASWARN (mbschr);

#endif

#if @GNULIB_MBSRCHR@

/* Locate the last single-byte character C in the character string STRING,

   and return a pointer to it.  Return NULL if C is not found in STRING.

   Unlike strrchr(), this function works correctly in multibyte locales with

   encodings such as GB18030.  */

# if defined __hpux || defined __INTERIX

#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)

#   define mbsrchr rpl_mbsrchr /* avoid collision with system function */

#  endif

_GL_FUNCDECL_RPL (mbsrchr, char *, (const char *string, int c)

                                   _GL_ATTRIBUTE_PURE

                                   _GL_ARG_NONNULL ((1)));

_GL_CXXALIAS_RPL (mbsrchr, char *, (const char *string, int c));

# else

_GL_FUNCDECL_SYS (mbsrchr, char *, (const char *string, int c)

                                   _GL_ATTRIBUTE_PURE

                                   _GL_ARG_NONNULL ((1)));

_GL_CXXALIAS_SYS (mbsrchr, char *, (const char *string, int c));

# endif

_GL_CXXALIASWARN (mbsrchr);

#endif

#if @GNULIB_MBSSTR@

/* Find the first occurrence of the character string NEEDLE in the character

   string HAYSTACK.  Return NULL if NEEDLE is not found in HAYSTACK.

   Unlike strstr(), this function works correctly in multibyte locales with

   encodings different from UTF-8.  */

_GL_EXTERN_C char * mbsstr (const char *haystack, const char *needle)

     _GL_ATTRIBUTE_PURE

     _GL_ARG_NONNULL ((1, 2));

#endif

#if @GNULIB_MBSCASECMP@

/* Compare the character strings S1 and S2, ignoring case, returning less than,

   equal to or greater than zero if S1 is lexicographically less than, equal to

   or greater than S2.

   Note: This function may, in multibyte locales, return 0 for strings of

   different lengths!

   Unlike strcasecmp(), this function works correctly in multibyte locales.  */

_GL_EXTERN_C int mbscasecmp (const char *s1, const char *s2)

     _GL_ATTRIBUTE_PURE

     _GL_ARG_NONNULL ((1, 2));

#endif

#if @GNULIB_MBSNCASECMP@

/* Compare the initial segment of the character string S1 consisting of at most

   N characters with the initial segment of the character string S2 consisting

   of at most N characters, ignoring case, returning less than, equal to or

   greater than zero if the initial segment of S1 is lexicographically less

   than, equal to or greater than the initial segment of S2.

   Note: This function may, in multibyte locales, return 0 for initial segments

   of different lengths!

   Unlike strncasecmp(), this function works correctly in multibyte locales.

   But beware that N is not a byte count but a character count!  */

_GL_EXTERN_C int mbsncasecmp (const char *s1, const char *s2, size_t n)

     _GL_ATTRIBUTE_PURE

     _GL_ARG_NONNULL ((1, 2));

#endif

#if @GNULIB_MBSPCASECMP@

/* Compare the initial segment of the character string STRING consisting of

   at most mbslen (PREFIX) characters with the character string PREFIX,

   ignoring case.  If the two match, return a pointer to the first byte

   after this prefix in STRING.  Otherwise, return NULL.

   Note: This function may, in multibyte locales, return non-NULL if STRING

   is of smaller length than PREFIX!

   Unlike strncasecmp(), this function works correctly in multibyte

   locales.  */

_GL_EXTERN_C char * mbspcasecmp (const char *string, const char *prefix)

     _GL_ATTRIBUTE_PURE

     _GL_ARG_NONNULL ((1, 2));

#endif

#if @GNULIB_MBSCASESTR@

/* Find the first occurrence of the character string NEEDLE in the character

   string HAYSTACK, using case-insensitive comparison.

   Note: This function may, in multibyte locales, return success even if

   strlen (haystack) < strlen (needle) !