[vlc-devel] commit: Implemented replacement for swab. (Laurent Aimar )

[git version control]

vlc | branch: master | Laurent Aimar <fenrir at videolan.org> | Sun Apr 12 15:24:23 2009 +0200| [e8689aeac08c65fd665c651f03f024e35249ec4b] | committer: Laurent Aimar 

Implemented replacement for swab.

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=e8689aeac08c65fd665c651f03f024e35249ec4b
---

 compat/swab.c        |   43 +++++++++++++++++++++++++++++++++++++++++++
 configure.ac         |    4 ++--
 include/vlc_fixups.h |    4 ++++
 3 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/compat/swab.c b/compat/swab.c
new file mode 100644
index 0000000..f0f3433
--- /dev/null
+++ b/compat/swab.c
@@ -0,0 +1,43 @@
+/*****************************************************************************
+ * swab.c: swab() replacement
+ *****************************************************************************
+ * Copyright © 2009 the VideoLAN project
+ *
+ * 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 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU 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 <stdlib.h>
+#include <stdint.h>
+
+void swab( const void *p_src_, void *p_dst_, ssize_t n )
+{
+    const uint8_t *p_src = p_src_;
+    uint8_t *p_dst = p_dst_;
+
+    if( n < 0 )
+        return;
+
+    for( ssize_t i = 0; i < n-1; i += 2 )
+    {
+        uint8_t i_tmp = p_src[i+0];
+        p_dst[i+0] = p_src[i+1];
+        p_dst[i+1] = i_tmp;
+    }
+}
+
diff --git a/configure.ac b/configure.ac
index 85f314c..a50ea8b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -552,10 +552,10 @@ dnl Check for system libs needed
 need_libc=false
 
 dnl Check for usual libc functions
-AC_CHECK_FUNCS([gettimeofday isatty swab sigrelse getpwuid_r memalign posix_memalign if_nametoindex getenv putenv setenv ctime_r lrintf daemon fork lstat posix_fadvise posix_madvise uselocale])
+AC_CHECK_FUNCS([gettimeofday isatty sigrelse getpwuid_r memalign posix_memalign if_nametoindex getenv putenv setenv ctime_r lrintf daemon fork lstat posix_fadvise posix_madvise uselocale])
 AC_FUNC_ALLOCA
 AC_CHECK_FUNCS(fcntl)
-AC_REPLACE_FUNCS([asprintf atof atoll gmtime_r lldiv localtime_r rewind strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtoll vasprintf])
+AC_REPLACE_FUNCS([asprintf atof atoll gmtime_r lldiv localtime_r rewind strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtoll vasprintf swab])
 AC_CHECK_FUNCS([stricmp strnicmp])
 
 dnl Check for Linux system calls
diff --git a/include/vlc_fixups.h b/include/vlc_fixups.h
index 7c07079..ecc8fec 100644
--- a/include/vlc_fixups.h
+++ b/include/vlc_fixups.h
@@ -184,4 +184,8 @@ typedef void *locale_t;
 #define N_(str) gettext_noop (str)
 #define gettext_noop(str) (str)
 
+#ifndef HAVE_SWAB
+void swab (const void *, void *, ssize_t);
+#endif
+
 #endif /* !LIBVLC_FIXUPS_H */