From 684b01ee39da9caf6b70afd28f461dfcd0b3adca Mon Sep 17 00:00:00 2001
From: Gerd Moellmann <gerd@gnu.org>
Date: Wed, 6 Sep 2000 21:42:14 +0000
Subject: [PATCH] (set_buffer_internal_1) [REL_ALLOC_MMAP]: If buffer's text
 buffer is null, map new memory.

---
 src/buffer.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/buffer.c b/src/buffer.c
index 5c5c2e05b25..a839b1e97a9 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1548,6 +1548,17 @@ set_buffer_internal_1 (b)
   register Lisp_Object tail, valcontents;
   Lisp_Object tem;
 
+#ifdef REL_ALLOC_MMAP
+  if (b->text->beg == NULL)
+    {
+      BLOCK_INPUT;
+      BUFFER_REALLOC (BUF_BEG_ADDR (b),
+		      (BUF_Z_BYTE (b) - BUF_BEG_BYTE (b)
+		       + BUF_GAP_SIZE (b) + 1));
+      UNBLOCK_INPUT;
+    }
+#endif /* REL_ALLOC_MMAP */
+  
   if (current_buffer == b)
     return;
 
-- 
2.39.2