From 1d7857bc635c0bfe7c5b1f325d31feb7660e9a5a Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Wed, 30 Jul 1997 15:29:08 -0300
Subject: [PATCH] free(b) is equivalent to realloc(b, 0)

---
 luamem.c | 8 ++++++--
 luamem.h | 4 ++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/luamem.c b/luamem.c
index 9c0799b3..812da490 100644
--- a/luamem.c
+++ b/luamem.c
@@ -3,7 +3,7 @@
 ** TecCGraf - PUC-Rio
 */
 
-char *rcs_luamem = "$Id: luamem.c,v 1.15 1997/03/31 14:17:09 roberto Exp roberto $";
+char *rcs_luamem = "$Id: luamem.c,v 1.16 1997/04/01 21:23:20 roberto Exp $";
 
 #include <stdlib.h>
 
@@ -15,7 +15,7 @@ char *rcs_luamem = "$Id: luamem.c,v 1.15 1997/03/31 14:17:09 roberto Exp roberto
 
 #if !DEBUG
 
-void luaI_free (void *block)
+static void lfree (void *block)
 {
   if (block)
   {
@@ -31,6 +31,10 @@ void *luaI_realloc (void *oldblock, unsigned long size)
   size_t s = (size_t)size;
   if (s != size)
     lua_error("Allocation Error: Block too big");
+  if (size == 0) {  /* ANSI doen't need this, but some machines... */
+    lfree(oldblock);
+    return NULL;
+  }
   block = oldblock ? realloc(oldblock, s) : malloc(s);
   if (block == NULL)
     lua_error(memEM);
diff --git a/luamem.h b/luamem.h
index 8b88ee9b..f9c573d7 100644
--- a/luamem.h
+++ b/luamem.h
@@ -1,7 +1,7 @@
 /*
 ** mem.c
 ** memory manager for lua
-** $Id: luamem.h,v 1.9 1997/03/31 14:10:11 roberto Exp roberto $
+** $Id: luamem.h,v 1.10 1997/07/29 20:38:45 roberto Exp roberto $
 */
  
 #ifndef luamem_h
@@ -23,12 +23,12 @@
 #define memEM "not enough memory"
 
 
-void luaI_free (void *block);
 void *luaI_realloc (void *oldblock, unsigned long size);
 void *luaI_buffer (unsigned long size);
 int luaI_growvector (void **block, unsigned long nelems, int size,
                        char *errormsg, unsigned long limit);
 
+#define luaI_free(b)	luaI_realloc((b), 0)
 #define luaI_malloc(s)	luaI_realloc(NULL, (s))
 #define new(s)          ((s *)luaI_malloc(sizeof(s)))
 #define newvector(n,s)  ((s *)luaI_malloc((n)*sizeof(s)))