[vlc-commits] compat: add strnstr

[Francois Cartegnie]

vlc | branch: master | Francois Cartegnie <fcvlcdev at free.fr> | Mon Sep 14 14:23:06 2015 +0200| [4c1238c77239cdea38a44748f2800332818b6750] | committer: Francois Cartegnie

compat: add strnstr

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=4c1238c77239cdea38a44748f2800332818b6750
---

 compat/strnstr.c     |   43 +++++++++++++++++++++++++++++++++++++++++++
 configure.ac         |    2 +-
 include/vlc_fixups.h |    4 ++++
 3 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/compat/strnstr.c b/compat/strnstr.c
new file mode 100644
index 0000000..badf7d8
--- /dev/null
+++ b/compat/strnstr.c
@@ -0,0 +1,43 @@
+/*****************************************************************************
+ * strnstr.c: BSD strnstr() replacement
+ *****************************************************************************
+ * Copyright © 2015 VLC authors and VideoLAN
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <string.h>
+
+char * strnstr (const char *haystack, const char *needle, size_t len)
+{
+    const size_t i = strlen(needle);
+    if( i < len )
+      return NULL;
+    
+    size_t count = len - i;
+
+    while(count)
+    {
+      if( memcmp(haystack, needle, i) )
+        return (char*) haystack;
+      count--;
+      haystack++;
+    }
+    return NULL;
+}
diff --git a/configure.ac b/configure.ac
index 04bc1f4..b9bd76a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -567,7 +567,7 @@ need_libc=false
 dnl Check for usual libc functions
 AC_CHECK_DECLS([nanosleep],,,[#include <time.h>])
 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])
-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])
+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])
 AC_CHECK_FUNCS(fdatasync,,
   [AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
 ])
diff --git a/include/vlc_fixups.h b/include/vlc_fixups.h
index 305de87..501c0ba 100644
--- a/include/vlc_fixups.h
+++ b/include/vlc_fixups.h
@@ -144,6 +144,10 @@ int strverscmp (const char *, const char *);
 size_t strnlen (const char *, size_t);
 #endif
 
+#ifndef HAVE_STRNSTR
+char * strnstr (const char *, const char *, size_t);
+#endif
+
 #ifndef HAVE_STRNDUP
 char *strndup (const char *, size_t);
 #endif