Stricter checks for mg_url_*()

src/url.c

@@ -16,19 +16,19 @@ static struct url urlparse(const char *url) {
   struct url u;
   memset(&u, 0, sizeof(u));
   for (i = 0; url[i] != '\0'; i++) {
-    if (i > 0 && url[i - 1] == '/' && url[i] == '/') {
+    if (i > 0 && u.host == 0 && url[i - 1] == '/' && url[i] == '/') {
       u.host = i + 1;
       u.port = 0;
     } else if (url[i] == ']') {
       u.port = 0;  // IPv6 URLs, like http://[::1]/bar
-    } else if (url[i] == ':') {
+    } else if (url[i] == ':' && u.port == 0) {
       u.port = i + 1;
-    } else if (url[i] == '@') {
+    } else if (url[i] == '@' && u.user == 0 && u.pass == 0) {
       u.user = u.host;
       u.pass = u.port;
       u.host = i + 1;
       u.port = 0;
-    } else if (u.host && !u.uri && url[i] == '/') {
+    } else if (u.host && u.uri == 0 && url[i] == '/') {
       u.uri = i;
     }
   }