From a7f35f0d84ec481748df2de4f7ee0ad71d3a1a3e Mon Sep 17 00:00:00 2001
From: Fabian Greffrath <fabian@greffrath.com>
Date: Thu, 8 Sep 2022 16:36:56 +0200
Subject: [PATCH] ignore empty lumps in W_ReadLump()

Do not even attempt to read empty lumps, because Windows' POSIX read()
implementation fails when passed a `NULL` buffer parameter, even though
the len parameter is also `0`.
---
 src/w_wad.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/w_wad.c b/src/w_wad.c
index 0c38e713..4e7d7232 100644
--- a/src/w_wad.c
+++ b/src/w_wad.c
@@ -436,7 +436,7 @@ void W_ReadLump(int lump, void *dest)
 
   if (l->data)     // killough 1/31/98: predefined lump data
     memcpy(dest, l->data, l->size);
-  else
+  else if (l->size) // [FG] ignore empty lumps
     {
       int c;