From: Gerd Moellmann <gerd@gnu.org>
Date: Thu, 18 Nov 1999 13:31:04 +0000 (+0000)
Subject: (struct buffer_text): Add comment about moving
X-Git-Tag: emacs-pretest-21.0.90~6064
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=0afdfe3895469bcc7f47d5af46633e7c24c08e3c;p=emacs.git

(struct buffer_text): Add comment about moving
buffer text if REL_ALLOC is defined.
---

diff --git a/src/buffer.h b/src/buffer.h
index a3e87c8f205..e37cd91c87e 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -388,7 +388,12 @@ extern int _fetch_multibyte_char_len;
 
 struct buffer_text
   {
-    unsigned char *beg;		/* Actual address of buffer contents.  */
+    /* Actual address of buffer contents.  If REL_ALLOC is defined,
+       this address might change when blocks are relocated which can
+       e.g. happen when malloc is called.  So, don't pass a pointer
+       into a buffer's text to functions that malloc.  */
+    unsigned char *beg;
+    
     int gpt;			/* Char pos of gap in buffer.  */
     int z;			/* Char pos of end of buffer.  */
     int gpt_byte;		/* Byte pos of gap in buffer.  */