avstring: Add locale independent implementations of strcasecmp/strncasecmp

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 51.14.0
+  Add av_strcasecmp() and av_strncasecmp() to avstring.h.
+
 2011-11-xx - xxxxxxx - lavu 51.13.0
   Add av_toupper()/av_tolower()
 

libavutil/avstring.c

@@ -134,6 +134,27 @@ char *av_get_token(const char **buf, const char *term)
     return ret;
 }
 
+int av_strcasecmp(const char *a, const char *b)
+{
+    uint8_t c1, c2;
+    do {
+        c1 = av_tolower(*a++);
+        c2 = av_tolower(*b++);
+    } while (c1 && c1 == c2);
+    return c1 - c2;
+}
+
+int av_strncasecmp(const char *a, const char *b, size_t n)
+{
+    const char *end = a + n;
+    uint8_t c1, c2;
+    do {
+        c1 = av_tolower(*a++);
+        c2 = av_tolower(*b++);
+    } while (a < end && c1 && c1 == c2);
+    return c1 - c2;
+}
+
 #ifdef TEST
 
 #undef printf

libavutil/avstring.h

@@ -151,4 +151,16 @@ static inline int av_tolower(int c)
     return c;
 }
 
+/*
+ * Locale independent case-insensitive compare.
+ * Note: This means only ASCII-range characters are case-insensitive
+ */
+int av_strcasecmp(const char *a, const char *b);
+
+/**
+ * Locale independent case-insensitive compare.
+ * Note: This means only ASCII-range characters are case-insensitive
+ */
+int av_strncasecmp(const char *a, const char *b, size_t n);
+
 #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 13
+#define LIBAVUTIL_VERSION_MINOR 14
 #define LIBAVUTIL_VERSION_MICRO  0
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \