Linkify file URL

sundown/autolink.c

@@ -47,7 +47,7 @@ sd_autolink_issafe(const uint8_t *link, size_t link_len)
 		"@", "&", "%", "#",
 		"gemini://", "gopher://", "finger://",
 		"ytdl://",
-		"/", "http://", "https://", "ftp://", "mailto:"
+		"/", "http://", "https://", "ftp://", "mailto:", "file:///",
 	};
 	static const size_t valid_uris_count = sizeof(valid_uris)/sizeof(valid_uris[0]);
 
@@ -298,7 +298,8 @@ sd_autolink__url(
 		size - link_end,
 		flags & SD_AUTOLINK_SHORT_DOMAINS);
 
-	if (domain_len == 0)
+	if (domain_len == 0 &&
+			!(size >= 5 && strncmp((const char *)data, "file:", 5)))
 		return 0;
 
 	link_end += domain_len;