avstring: Add locale independent implementations of toupper/tolower

Signed-off-by: Martin Storsjö <martin@martin.st>

doc/APIchanges

@@ -13,6 +13,9 @@ libavutil:   2011-04-18
 
 API changes, most recent first:
 
+2011-11-xx - xxxxxxx - lavu 51.13.0
+  Add av_toupper()/av_tolower()
+
 2011-11-xx - xxxxxxx - lavf 53.13.0
   Add avformat_network_init()/avformat_network_uninit()
 

libavutil/avstring.h

@@ -131,4 +131,24 @@ char *av_d2str(double d);
  */
 char *av_get_token(const char **buf, const char *term);
 
+/**
+ * Locale independent conversion of ASCII characters to upper case.
+ */
+static inline int av_toupper(int c)
+{
+    if (c >= 'a' && c <= 'z')
+        c ^= 0x20;
+    return c;
+}
+
+/**
+ * Locale independent conversion of ASCII characters to lower case.
+ */
+static inline int av_tolower(int c)
+{
+    if (c >= 'A' && c <= 'Z')
+        c ^= 0x20;
+    return c;
+}
+
 #endif /* AVUTIL_AVSTRING_H */

libavutil/avutil.h

@@ -40,7 +40,7 @@
 #define AV_VERSION(a, b, c) AV_VERSION_DOT(a, b, c)
 
 #define LIBAVUTIL_VERSION_MAJOR 51
-#define LIBAVUTIL_VERSION_MINOR 12
+#define LIBAVUTIL_VERSION_MINOR 13
 #define LIBAVUTIL_VERSION_MICRO  0
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \