/* objalloc.c -- routines to allocate memory for objects
- Copyright 1997 Free Software Foundation, Inc.
+ Copyright (C) 1997-2018 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Cygnus Solutions.
This program is free software; you can redistribute it and/or modify it
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
-Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, 51 Franklin Street - Fifth Floor,
+Boston, MA 02110-1301, USA. */
+#include "config.h"
#include "ansidecl.h"
+
#include "objalloc.h"
/* Get a definition for NULL. */
#include <unixlib.h>
#else
-#ifdef ANSI_PROTOTYPES
/* Get a definition for size_t. */
#include <stddef.h>
-#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#else
/* For systems with larger pointers than ints, this must be declared. */
-extern PTR malloc PARAMS ((size_t));
+extern PTR malloc (size_t);
+extern void free (PTR);
+#endif
+
#endif
/* These routines allocate space for an object. Freeing allocated
/* Create an objalloc structure. */
struct objalloc *
-objalloc_create ()
+objalloc_create (void)
{
struct objalloc *ret;
struct objalloc_chunk *chunk;
/* Allocate space from an objalloc structure. */
PTR
-_objalloc_alloc (o, len)
- struct objalloc *o;
- unsigned long len;
+_objalloc_alloc (struct objalloc *o, unsigned long original_len)
{
+ unsigned long len = original_len;
+
/* We avoid confusion from zero sized objects by always allocating
at least 1 byte. */
if (len == 0)
len = (len + OBJALLOC_ALIGN - 1) &~ (OBJALLOC_ALIGN - 1);
+ /* Check for overflow in the alignment operation above and the
+ malloc argument below. */
+ if (len + CHUNK_HEADER_SIZE < original_len)
+ return NULL;
+
if (len <= o->current_space)
{
o->current_ptr += len;
/* Free an entire objalloc structure. */
void
-objalloc_free (o)
- struct objalloc *o;
+objalloc_free (struct objalloc *o)
{
struct objalloc_chunk *l;
recently allocated blocks. */
void
-objalloc_free_block (o, block)
- struct objalloc *o;
- PTR block;
+objalloc_free_block (struct objalloc *o, PTR block)
{
struct objalloc_chunk *p, *small;
char *b = (char *) block;