| | 1 | /*- |
| | 2 | * Copyright (c) 1998 Michael Smith |
| | 3 | * All rights reserved. |
| | 4 | * |
| | 5 | * Redistribution and use in source and binary forms, with or without |
| | 6 | * modification, are permitted provided that the following conditions |
| | 7 | * are met: |
| | 8 | * 1. Redistributions of source code must retain the above copyright |
| | 9 | * notice, this list of conditions and the following disclaimer. |
| | 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 11 | * notice, this list of conditions and the following disclaimer in the |
| | 12 | * documentation and/or other materials provided with the distribution. |
| | 13 | * |
| | 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| | 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| | 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 24 | * SUCH DAMAGE. |
| | 25 | * |
| | 26 | * $FreeBSD: src/lib/libstand/sbrk.c,v 1.2.2.1 2000/05/18 08:00:57 ps Exp $ |
| | 27 | * $DragonFly: src/lib/libstand/sbrk.c,v 1.2 2003/06/17 04:26:51 dillon Exp $ |
| | 28 | */ |
| | 29 | |
| | 30 | /* |
| | 31 | * Minimal sbrk() emulation required for malloc support. |
| | 32 | */ |
| | 33 | |
| | 34 | #include <string.h> |
| | 35 | #include "stand.h" |
| | 36 | |
| | 37 | static size_t maxheap, heapsize = 0; |
| | 38 | static void *heapbase; |
| | 39 | |
| | 40 | void |
| | 41 | setheap(void *base, void *top) |
| | 42 | { |
| | 43 | /* Align start address to 16 bytes for the malloc code. Sigh. */ |
| | 44 | heapbase = (void *)(((uintptr_t)base + 15) & ~15); |
| | 45 | maxheap = top - heapbase; |
| | 46 | } |
| | 47 | |
| | 48 | char * |
| | 49 | sbrk(int incr) |
| | 50 | { |
| | 51 | char *ret; |
| | 52 | |
| | 53 | if ((heapsize + incr) <= maxheap) { |
| | 54 | ret = heapbase + heapsize; |
| | 55 | bzero(ret, incr); |
| | 56 | heapsize += incr; |
| | 57 | return(ret); |
| | 58 | } |
| | 59 | errno = ENOMEM; |
| | 60 | return((char *)-1); |
| | 61 | } |
| | 62 | |
projects / dragonfly.git / blame_incremental