Lua now uses only `realloc' for all its memory management

lmem.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lmem.c,v 1.54 2002/05/01 20:40:42 roberto Exp roberto $
+** $Id: lmem.c,v 1.55 2002/05/15 18:57:44 roberto Exp roberto $
 ** Interface to Memory Manager
 ** See Copyright Notice in lua.h
 */
@@ -17,9 +17,14 @@
 
 
 
+/*
+** definition for realloc function. It must assure that
+** l_realloc(block, x, 0) frees the block, and l_realloc(NULL, 0, x)
+** allocates a new block (ANSI C assures that).
+** (`os' is the old block size; some allocators may use that.)
+*/
 #ifndef l_realloc
 #define l_realloc(b,os,s)	realloc(b,s)
-#define l_free(b,s)		free(b)
 #endif
 
 
@@ -50,8 +55,10 @@ void *luaM_growaux (lua_State *L, void *block, int *size, int size_elems,
 */
 void *luaM_realloc (lua_State *L, void *block, lu_mem oldsize, lu_mem size) {
   if (size == 0) {
-    l_free(block, oldsize);  /* block may be NULL; that is OK for free */
-    block = NULL;
+    if (block != NULL) {
+      l_realloc(block, oldsize, size);
+      block = NULL;
+    }
   }
   else if (size >= MAX_SIZET)
     luaG_runerror(L, "memory allocation error: block too big");