125 lines
3.3 KiB
C
Executable File
125 lines
3.3 KiB
C
Executable File
/* Standard debugging hooks for `malloc'.
|
|
Copyright 1990 Free Software Foundation
|
|
Written May 1989 by Mike Haertel.
|
|
|
|
The author may be reached (Email) at the address mike@ai.mit.edu,
|
|
or (US mail) as Mike Haertel c/o Free Software Foundation.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
#include "ansidecl.h"
|
|
#define size_t unsigned int
|
|
#define ptrdiff_t int
|
|
#define NULL 0
|
|
#define __ONEFILE
|
|
#include "gmalloc.h"
|
|
|
|
/* Old hook values. */
|
|
static void EXFUN((*old_free_hook), (PTR ptr));
|
|
static PTR EXFUN((*old_malloc_hook), (size_t size));
|
|
static PTR EXFUN((*old_realloc_hook), (PTR ptr, size_t size));
|
|
|
|
|
|
/* Function to call when something awful happens. */
|
|
extern void abort();
|
|
static void EXFUN((*abortfunc), (void)) = (void (*)()) abort;
|
|
|
|
/* Arbitrary magical numbers. */
|
|
#define MAGICWORD 0xfedabeeb
|
|
#define MAGICBYTE ((char) 0xd7)
|
|
|
|
struct hdr
|
|
{
|
|
size_t size; /* Exact size requested by user. */
|
|
unsigned int magic; /* Magic number to check header integrity. */
|
|
};
|
|
|
|
static void
|
|
DEFUN(checkhdr, (hdr), CONST struct hdr *hdr)
|
|
{
|
|
if (hdr->magic != MAGICWORD || ((char *) &hdr[1])[hdr->size] != MAGICBYTE)
|
|
(*abortfunc)();
|
|
}
|
|
|
|
static void
|
|
DEFUN(freehook, (ptr), PTR ptr)
|
|
{
|
|
struct hdr *hdr = ((struct hdr *) ptr) - 1;
|
|
checkhdr(hdr);
|
|
hdr->magic = 0;
|
|
__free_hook = old_free_hook;
|
|
free(hdr);
|
|
__free_hook = freehook;
|
|
}
|
|
|
|
static PTR
|
|
DEFUN(mallochook, (size), size_t size)
|
|
{
|
|
struct hdr *hdr;
|
|
|
|
__malloc_hook = old_malloc_hook;
|
|
hdr = (struct hdr *) malloc(sizeof(struct hdr) + size + 1);
|
|
__malloc_hook = mallochook;
|
|
if (hdr == NULL)
|
|
return NULL;
|
|
|
|
hdr->size = size;
|
|
hdr->magic = MAGICWORD;
|
|
((char *) &hdr[1])[size] = MAGICBYTE;
|
|
return (PTR) (hdr + 1);
|
|
}
|
|
|
|
static PTR
|
|
DEFUN(reallochook, (ptr, size), PTR ptr AND size_t size)
|
|
{
|
|
struct hdr *hdr = ((struct hdr *) ptr) - 1;
|
|
|
|
checkhdr(hdr);
|
|
__free_hook = old_free_hook;
|
|
__malloc_hook = old_malloc_hook;
|
|
__realloc_hook = old_realloc_hook;
|
|
hdr = (struct hdr *) realloc((PTR) hdr, sizeof(struct hdr) + size + 1);
|
|
__free_hook = freehook;
|
|
__malloc_hook = mallochook;
|
|
__realloc_hook = reallochook;
|
|
if (hdr == NULL)
|
|
return NULL;
|
|
|
|
hdr->size = size;
|
|
((char *) &hdr[1])[size] = MAGICBYTE;
|
|
return (PTR) (hdr + 1);
|
|
}
|
|
|
|
void
|
|
DEFUN(mcheck, (func), void EXFUN((*func), (void)))
|
|
{
|
|
static int mcheck_used = 0;
|
|
|
|
if (func)
|
|
abortfunc = func;
|
|
|
|
/* These hooks may not be safely inserted if malloc is already in use. */
|
|
if (!__malloc_initialized && !mcheck_used)
|
|
{
|
|
old_free_hook = __free_hook;
|
|
__free_hook = freehook;
|
|
old_malloc_hook = __malloc_hook;
|
|
__malloc_hook = mallochook;
|
|
old_realloc_hook = __realloc_hook;
|
|
__realloc_hook = reallochook;
|
|
mcheck_used = 1;
|
|
}
|
|
}
|