From 37a37c191defeba5506e87c64e9a31fb54442b96 Mon Sep 17 00:00:00 2001
From: yexo <yexo@openttd.org>
Date: Wed, 24 Mar 2010 11:20:30 +0000
Subject: [PATCH] (svn r19512) -Fix (r19511): using the 'alias' console command
 it's possible to create a duplicate alias name

---
 src/console.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/console.cpp b/src/console.cpp
index 222bed0245..e5d5ae9621 100644
--- a/src/console.cpp
+++ b/src/console.cpp
@@ -261,6 +261,11 @@ IConsoleCmd *IConsoleCmdGet(const char *name)
  */
 void IConsoleAliasRegister(const char *name, const char *cmd)
 {
+	if (IConsoleAliasGet(name) != NULL) {
+		IConsoleError("an alias with this name already exists; insertion aborted");
+		return;
+	}
+
 	char *new_alias = strdup(name);
 	char *cmd_aliased = strdup(cmd);
 	IConsoleAlias *item_new = MallocT<IConsoleAlias>(1);