cgit

diff --git a/ui-snapshot.c b/ui-snapshot.c
index f25613e9d6c98530e48c1814305000d22ebbb44f..5372f5d3d8b42a474713fe0867f4b50d96f5acf1 100644
--- a/ui-snapshot.c
+++ b/ui-snapshot.c
@@ -156,20 +156,31 @@
 	return NULL;
 }
 
+void show_error(char *msg)
+{
+	ctx.page.mimetype = "text/html";
+	cgit_print_http_headers(&ctx);
+	cgit_print_docstart(&ctx);
+	cgit_print_pageheader(&ctx);
+	cgit_print_error(msg);
+	cgit_print_docend();
+}
+
 void cgit_print_snapshot(const char *head, const char *hex,
 			 const char *filename, int snapshots, int dwim)
 {
 	const struct cgit_snapshot_format* f;
 	char *prefix = NULL;
 
+	if (!filename) {
+		show_error("No snapshot name specified");
+		return;
+	}
+
 	f = get_format(filename);
 	if (!f) {
-		ctx.page.mimetype = "text/html";
-		cgit_print_http_headers(&ctx);
-		cgit_print_docstart(&ctx);
-		cgit_print_pageheader(&ctx);
-		cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
-		cgit_print_docend();
+		show_error(xstrdup(fmt("Unsupported snapshot format: %s",
+				       filename)));
 		return;
 	}
 




diff --git a/ui-tree.c b/ui-tree.c
index c6159ec3df97e059e1cd894202b4173172e9c9c1..553dbaa5a27e60ebad594d23cc842895bdf4beed 100644
--- a/ui-tree.c
+++ b/ui-tree.c
@@ -25,11 +25,14 @@ 	html("\n");
 	html("<tr><td class='linenumbers'><pre>"); 	idx = 0; 	lineno = 0;-	htmlf(numberfmt, ++lineno);-	while(idx < size - 1) { // skip absolute last newline-		if (buf[idx] == '\n')-			htmlf(numberfmt, ++lineno);-		idx++;++	if (size) {+		htmlf(numberfmt, ++lineno);+		while(idx < size - 1) { // skip absolute last newline+			if (buf[idx] == '\n')+				htmlf(numberfmt, ++lineno);+			idx++;+		} 	} 	html("</pre></td>\n"); 	html("<td class='lines'><pre><code>");