X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=libbb%2Fsafe_strncpy.c;h=5eb0db0bd4c5732e47e94eadd94d0fa403525b33;hb=b05bcaf29c9008799aedb535cb42d2e60cc4cbb9;hp=8eb6a014fa2ee14d1fe89f458ac6ab215f6c7b6f;hpb=0ef64bdb40c54681e8dd5ab8df42ac88e4ab1d4a;p=oweals%2Fbusybox.git

diff --git a/libbb/safe_strncpy.c b/libbb/safe_strncpy.c
index 8eb6a014f..5eb0db0bd 100644
--- a/libbb/safe_strncpy.c
+++ b/libbb/safe_strncpy.c
@@ -20,8 +20,13 @@ char* FAST_FUNC safe_strncpy(char *dst, const char *src, size_t size)
 /* Like strcpy but can copy overlapping strings. */
 void FAST_FUNC overlapping_strcpy(char *dst, const char *src)
 {
-	while ((*dst = *src) != '\0') {
-		dst++;
-		src++;
+	/* Cheap optimization for dst == src case -
+	 * better to have it here than in many callers.
+	 */
+	if (dst != src) {
+		while ((*dst = *src) != '\0') {
+			dst++;
+			src++;
+		}
 	}
 }