[PATCH] Disallow empty tag name as target for rename.

[Florian Bruhin <me _at_ the _minus_ compiler _dot_ org>]

Using  hc rename default ''  or similiar it was possible to create an
empty tag which should be prevented, the attached patch fixes this.

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From f701fe77f486d1e9016d78e48ab21b6f016b1d83 Mon Sep 17 00:00:00 2001
From: Florian Bruhin <git _at_ the _minus_ compiler _dot_ org>
Date: Tue, 20 May 2014 15:14:12 +0200
Subject: [PATCH] Disallow empty tag name as target for rename.

---
 src/tag.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/tag.c b/src/tag.c
index 483495b..e15460e 100644
--- a/src/tag.c
+++ b/src/tag.c
@@ -272,6 +272,11 @@ int tag_rename_command(int argc, char** argv, GString* 
output) {
     if (argc < 3) {
         return HERBST_NEED_MORE_ARGS;
     }
+    if (!strcmp("", argv[2])) {
+        g_string_append_printf(output,
+            "%s: An empty tag name is not permitted\n", argv[0]);
+        return HERBST_INVALID_ARGUMENT;
+    }
     HSTag* tag = find_tag(argv[1]);
     if (!tag) {
         g_string_append_printf(output,
-- 
1.9.2

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