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new ANSI C does not assure that realloc(p,0) == free(p)

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This commit is contained in:
Roberto Ierusalimschy 2002-10-08 15:45:07 -03:00
parent fa2f1ec7ba
commit 02afc892d5
2 changed files with 15 additions and 7 deletions
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19
lmem.c
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@ -1,5 +1,5 @@
/*
** $Id: lmem.c,v 1.56 2002/06/11 16:23:47 roberto Exp roberto $
** $Id: lmem.c,v 1.57 2002/06/18 15:19:27 roberto Exp roberto $
** Interface to Memory Manager
** See Copyright Notice in lua.h
*/
@ -18,15 +18,22 @@
/*
** 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.)
** definition for realloc function. It must assure that 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)
#endif
/*
** definition for free function. (`os' is the old block size; some
** allocators may use that.)
*/
#ifndef l_free
#define l_free(b,os) free(b)
#endif
#define MINSIZEARRAY 4
@ -56,7 +63,7 @@ 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) {
if (block != NULL) {
l_realloc(block, oldsize, size);
l_free(block, oldsize);
block = NULL;
}
}

3
ltests.h
View File

@ -1,5 +1,5 @@
/*
** $Id: ltests.h,v 1.14 2002/06/13 13:45:31 roberto Exp roberto $
** $Id: ltests.h,v 1.15 2002/07/17 16:25:13 roberto Exp roberto $
** Internal Header for Debugging of the Lua Implementation
** See Copyright Notice in lua.h
*/
@ -34,6 +34,7 @@ extern unsigned long memdebug_memlimit;
#define l_realloc(b, os, s) debug_realloc(b, os, s)
#define l_free(b, os) debug_realloc(b, os, 0)
void *debug_realloc (void *block, size_t oldsize, size_t size);