1*4a5d661aSToomas Soome /*- 2*4a5d661aSToomas Soome * Copyright (c) 1998 Michael Smith 3*4a5d661aSToomas Soome * All rights reserved. 4*4a5d661aSToomas Soome * 5*4a5d661aSToomas Soome * Redistribution and use in source and binary forms, with or without 6*4a5d661aSToomas Soome * modification, are permitted provided that the following conditions 7*4a5d661aSToomas Soome * are met: 8*4a5d661aSToomas Soome * 1. Redistributions of source code must retain the above copyright 9*4a5d661aSToomas Soome * notice, this list of conditions and the following disclaimer. 10*4a5d661aSToomas Soome * 2. Redistributions in binary form must reproduce the above copyright 11*4a5d661aSToomas Soome * notice, this list of conditions and the following disclaimer in the 12*4a5d661aSToomas Soome * documentation and/or other materials provided with the distribution. 13*4a5d661aSToomas Soome * 14*4a5d661aSToomas Soome * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15*4a5d661aSToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16*4a5d661aSToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17*4a5d661aSToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18*4a5d661aSToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19*4a5d661aSToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20*4a5d661aSToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21*4a5d661aSToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22*4a5d661aSToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23*4a5d661aSToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24*4a5d661aSToomas Soome * SUCH DAMAGE. 25*4a5d661aSToomas Soome */ 26*4a5d661aSToomas Soome 27*4a5d661aSToomas Soome #include <sys/cdefs.h> 28*4a5d661aSToomas Soome __FBSDID("$FreeBSD$"); 29*4a5d661aSToomas Soome 30*4a5d661aSToomas Soome /* 31*4a5d661aSToomas Soome * Minimal sbrk() emulation required for malloc support. 32*4a5d661aSToomas Soome */ 33*4a5d661aSToomas Soome 34*4a5d661aSToomas Soome #include <string.h> 35*4a5d661aSToomas Soome #include "stand.h" 36*4a5d661aSToomas Soome #include "zalloc_defs.h" 37*4a5d661aSToomas Soome 38*4a5d661aSToomas Soome static size_t maxheap, heapsize = 0; 39*4a5d661aSToomas Soome static void *heapbase; 40*4a5d661aSToomas Soome 41*4a5d661aSToomas Soome void 42*4a5d661aSToomas Soome setheap(void *base, void *top) 43*4a5d661aSToomas Soome { 44*4a5d661aSToomas Soome /* Align start address for the malloc code. Sigh. */ 45*4a5d661aSToomas Soome heapbase = (void *)(((uintptr_t)base + MALLOCALIGN_MASK) & 46*4a5d661aSToomas Soome ~MALLOCALIGN_MASK); 47*4a5d661aSToomas Soome maxheap = (char *)top - (char *)heapbase; 48*4a5d661aSToomas Soome } 49*4a5d661aSToomas Soome 50*4a5d661aSToomas Soome char * 51*4a5d661aSToomas Soome sbrk(int incr) 52*4a5d661aSToomas Soome { 53*4a5d661aSToomas Soome char *ret; 54*4a5d661aSToomas Soome 55*4a5d661aSToomas Soome if ((heapsize + incr) <= maxheap) { 56*4a5d661aSToomas Soome ret = (char *)heapbase + heapsize; 57*4a5d661aSToomas Soome bzero(ret, incr); 58*4a5d661aSToomas Soome heapsize += incr; 59*4a5d661aSToomas Soome return(ret); 60*4a5d661aSToomas Soome } 61*4a5d661aSToomas Soome errno = ENOMEM; 62*4a5d661aSToomas Soome return((char *)-1); 63*4a5d661aSToomas Soome } 64*4a5d661aSToomas Soome 65