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/* 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <layout.h>
#include <string.h>
#include "quik.h"
static char *malloc_ptr = (char *) MALLOC_BASE;
static char *last_alloc = 0;
void *malloc (unsigned int size)
{
char *caddr;
*(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 (oaddr == last_alloc) {
*(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 (m == last_alloc)
malloc_ptr = (char *) last_alloc - sizeof(int);
}
void mark (void **ptr)
{
*ptr = (void *) malloc_ptr;
}
void release (void *ptr)
{
malloc_ptr = (char *) ptr;
}
char *strdup(const char *str)
{
char *p = malloc(qstrlen(str) + 1);
strcpy(p, str);
return p;
}
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