mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/*-
|
|
* Copyright (c) 1998 Michael Smith
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Minimal sbrk() emulation required for malloc support.
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include "stand.h"
|
|
|
|
static size_t maxheap, heapsize = 0;
|
|
static void *heapbase;
|
|
|
|
void
|
|
setheap(void *base, void *top)
|
|
{
|
|
heapbase = base;
|
|
maxheap = top - base;
|
|
}
|
|
|
|
char *
|
|
sbrk(int incr)
|
|
{
|
|
char *ret;
|
|
|
|
if ((heapsize + incr) <= maxheap) {
|
|
ret = heapbase + heapsize;
|
|
bzero(ret, incr);
|
|
heapsize += incr;
|
|
return(ret);
|
|
}
|
|
errno = ENOMEM;
|
|
return((char *)-1);
|
|
}
|
|
|