From dcd1a6c3a4b692e0fa905075ef38273f85c138f4 Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Tue, 17 May 2011 22:06:22 +0000
Subject: Detect chex.deh if it is in the same directory as the IWAD file.

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 2340
---
 NEWS         |  2 ++
 src/d_main.c | 30 ++++++++++++++++++++++++++++--
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/NEWS b/NEWS
index 759e6af3..fd727429 100644
--- a/NEWS
+++ b/NEWS
@@ -24,6 +24,8 @@
        the setup tool, which will appear in the main menu on desktop
        environments such as Gnome and KDE (thanks Adrián Chaves
        Fernández).
+     * The Chex Quest dehacked patch (chex.deh) will now be detected
+       if it is in the same directory as the IWAD file.
 
     Compatibility:
      * Added support for the alternate version of the Final Doom
diff --git a/src/d_main.c b/src/d_main.c
index 2cfc6b44..c6979712 100644
--- a/src/d_main.c
+++ b/src/d_main.c
@@ -777,11 +777,37 @@ void PrintGameVersion(void)
 
 static void LoadChexDeh(void)
 {
-    char *chex_deh;
+    char *chex_deh = NULL;
+    char *sep;
 
     if (gameversion == exe_chex)
     {
-        chex_deh = D_FindWADByName("chex.deh");
+        // Look for chex.deh in the same directory as the IWAD file.
+
+        sep = strrchr(iwadfile, DIR_SEPARATOR);
+
+        if (sep != NULL)
+        {
+            chex_deh = malloc(strlen(iwadfile) + 9);
+            strcpy(chex_deh, iwadfile);
+            chex_deh[sep - iwadfile + 1] = '\0';
+            strcat(chex_deh, "chex.deh");
+        }
+        else
+        {
+            chex_deh = strdup("chex.deh");
+        }
+
+        // If the dehacked patch isn't found, try searching the WAD
+        // search path instead.  We might find it...
+
+        if (!M_FileExists(chex_deh))
+        {
+            free(chex_deh);
+            chex_deh = D_FindWADByName("chex.deh");
+        }
+
+        // Still not found?
 
         if (chex_deh == NULL)
         {
-- 
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