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compat: add strnstr
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43
compat/strnstr.c
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43
compat/strnstr.c
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@ -0,0 +1,43 @@
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/*****************************************************************************
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* strnstr.c: BSD strnstr() replacement
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*****************************************************************************
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* Copyright © 2015 VLC authors and VideoLAN
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <string.h>
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char * strnstr (const char *haystack, const char *needle, size_t len)
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{
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const size_t i = strlen(needle);
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if( i < len )
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return NULL;
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size_t count = len - i;
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while(count)
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{
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if( memcmp(haystack, needle, i) )
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return (char*) haystack;
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count--;
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haystack++;
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}
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return NULL;
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}
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@ -567,7 +567,7 @@ need_libc=false
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dnl Check for usual libc functions
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AC_CHECK_DECLS([nanosleep],,,[#include <time.h>])
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AC_CHECK_FUNCS([daemon fcntl fstatvfs fork getenv getpwuid_r isatty lstat memalign mkostemp mmap open_memstream openat pread posix_fadvise posix_madvise setlocale stricmp strnicmp strptime uselocale pthread_cond_timedwait_monotonic_np pthread_condattr_setclock])
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AC_REPLACE_FUNCS([atof atoll dirfd fdopendir ffsll flockfile fsync getdelim getpid lldiv nrand48 poll posix_memalign rewind setenv strcasecmp strcasestr strdup strlcpy strndup strnlen strsep strtof strtok_r strtoll swab tdestroy strverscmp])
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AC_REPLACE_FUNCS([atof atoll dirfd fdopendir ffsll flockfile fsync getdelim getpid lldiv nrand48 poll posix_memalign rewind setenv strcasecmp strcasestr strdup strlcpy strndup strnlen strnstr strsep strtof strtok_r strtoll swab tdestroy strverscmp])
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AC_CHECK_FUNCS(fdatasync,,
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[AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
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])
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@ -144,6 +144,10 @@ int strverscmp (const char *, const char *);
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size_t strnlen (const char *, size_t);
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#endif
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#ifndef HAVE_STRNSTR
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char * strnstr (const char *, const char *, size_t);
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#endif
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#ifndef HAVE_STRNDUP
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char *strndup (const char *, size_t);
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#endif
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