Merge pull request #148 from visitorckw/fix-strncmp

Fix potential out-of-bounds access in strncmp()

Author: jserv

lib/c.c

@@ -71,6 +71,8 @@ int strncmp(char *s1, char *s2, int len)
             return -1;
         if (s1[i] > s2[i])
             return 1;
+        if (!s1[i])
+            return 0;
         i++;
     }
     return 0;