avstring: Add locale independent implementations of strcasecmp/strncasecmp

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

1 files changed, 21 insertions, 0 deletions

diff --git a/libavutil/avstring.c b/libavutil/avstring.c
index 2b8c2d4a1d..11f3a7c321 100644
--- a/libavutil/avstring.c
+++ b/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