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From:	culliton@srg.af.mil (Tom Culliton x2278)
X-Mailer: SCO System V Mail (version 3.2)
To:	rc@hawkwind.utcs.toronto.edu
Subject: A potentially useful patch
Date:	Mon, 20 Sep 1993 20:33:48 -0400
Message-Id: <9309202033.aa10448@ceres.srg.af.mil>

Sigh.... While trying to get Alan's read integrated I rediscovered that
SCO-ODT 1.1 has a broken realloc.  It dumps core when it gets a null
pointer for the old buffer.  Fortunately Byron's code doesn't seem to
rely on this behaviour.  Just in case though, here's a patch for other
folks in the same boat.

Tom

*** config.h.old	Wed Feb  3 15:37:36 1993
--- config.h	Mon Sep 20 20:29:01 1993
***************
*** 108,113 ****
--- 108,122 ----
  #define NOJOB
   */
  
+ /*
+  * SCO-ODT 1.1 has a broken realloc which dumps core when it gets a null
+  * pointer for the old buffer.  Byron's code doesn't seem to rely on this
+  * behaviour, but just in case something in the future does, you can define
+  * this to enable a fanny shield.  Don't do it unless you know that you
+  * have this problem.
+ #define BROKENREALLOC
+ */
+  
  /* Beginning of defaults section: */
  
  #ifndef CUSTOM
*** nalloc.c.old	Thu Feb 27 02:22:10 1992
--- nalloc.c	Mon Sep 20 19:43:52 1993
***************
*** 122,127 ****
--- 122,132 ----
  
  extern void *erealloc(void *p, SIZE_T n) {
  	extern void *realloc(void *, SIZE_T);
+ #ifdef BROKENREALLOC
+ 	if (!p) {
+ 		p = ealloc(n);
+ 	} else
+ #endif
  	if ((p = realloc(p, n)) == NULL) {
  		uerror("realloc");
  		rc_exit(1);