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/* malloc.c - Dumb memory allocation routines
*
* Copyright (C) 1997 Paul Mackerras
* 1996 Maurizio Plaza
* 1996 Jakub Jelinek
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "types.h"
#include "stddef.h"
/* Imported functions */
extern void prom_printf (char *fmt, ...);
static char *malloc_ptr = 0;
static char *malloc_top = 0;
static char *last_alloc = 0;
void malloc_init(void *bottom, unsigned long size)
{
malloc_ptr = bottom;
malloc_top = bottom + size;
}
void malloc_dispose(void)
{
malloc_ptr = 0;
last_alloc = 0;
}
void *malloc (unsigned int size)
{
char *caddr;
if (!malloc_ptr)
return NULL;
if ((malloc_ptr + size + sizeof(int)) > malloc_top) {
prom_printf("malloc failed\n");
return NULL;
}
*(int *)malloc_ptr = size;
caddr = malloc_ptr + sizeof(int);
malloc_ptr += size + sizeof(int);
last_alloc = caddr;
malloc_ptr = (char *) ((((unsigned int) malloc_ptr) + 3) & (~3));
return caddr;
}
void *realloc(void *ptr, unsigned int size)
{
char *caddr, *oaddr = ptr;
if (!malloc_ptr)
return NULL;
if (oaddr == last_alloc) {
if (oaddr + size > malloc_top) {
prom_printf("realloc failed\n");
return NULL;
}
*(int *)(oaddr - sizeof(int)) = size;
malloc_ptr = oaddr + size;
return oaddr;
}
caddr = malloc(size);
if (caddr != 0 && oaddr != 0)
memcpy(caddr, oaddr, *(int *)(oaddr - sizeof(int)));
return caddr;
}
void free (void *m)
{
if (!malloc_ptr)
return;
if (m == last_alloc)
malloc_ptr = (char *) last_alloc - sizeof(int);
}
void mark (void **ptr)
{
if (!malloc_ptr)
return;
*ptr = (void *) malloc_ptr;
}
void release (void *ptr)
{
if (!malloc_ptr)
return;
malloc_ptr = (char *) ptr;
}
char *strdup(char const *str)
{
char *p = malloc(strlen(str) + 1);
if (p)
strcpy(p, str);
return p;
}
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