Add command line option to disable mmapped WAD I/O.

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 1139

1 files changed, 11 insertions, 0 deletions

diff --git a/src/w_file.c b/src/w_file.c
index 75c2eae4..bd1a99bd 100644
--- a/src/w_file.c
+++ b/src/w_file.c
@@ -28,6 +28,7 @@
 
 #include "doomdef.h"
 #include "doomtype.h"
+#include "m_argv.h"
 
 #include "w_file.h"
 
@@ -57,6 +58,16 @@ wad_file_t *W_OpenFile(char *path)
     wad_file_t *result;
     int i;
 
+    //!
+    // Do not use the OS's virtual memory subsystem to map WAD files 
+    // directly into memory.
+    //
+
+    if (M_CheckParm("-nommap") > 0) 
+    {
+        return stdc_wad_file.OpenFile(path);
+    }
+
     // Try all classes in order until we find one that works
 
     result = NULL;