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sbrk.c (256281) sbrk.c (269101)
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

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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
27#include <sys/cdefs.h>
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

--- 11 unchanged lines hidden (view full) ---

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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/10/lib/libstand/sbrk.c 136093 2004-10-03 15:58:20Z stefanf $");
28__FBSDID("$FreeBSD: stable/10/lib/libstand/sbrk.c 269101 2014-07-25 23:12:22Z ian $");
29
30/*
31 * Minimal sbrk() emulation required for malloc support.
32 */
33
34#include <string.h>
35#include "stand.h"
29
30/*
31 * Minimal sbrk() emulation required for malloc support.
32 */
33
34#include <string.h>
35#include "stand.h"
36#include "zalloc_defs.h"
36
37static size_t maxheap, heapsize = 0;
38static void *heapbase;
39
40void
41setheap(void *base, void *top)
42{
37
38static size_t maxheap, heapsize = 0;
39static void *heapbase;
40
41void
42setheap(void *base, void *top)
43{
43 /* Align start address to 16 bytes for the malloc code. Sigh. */
44 heapbase = (void *)(((uintptr_t)base + 15) & ~15);
44 /* Align start address for the malloc code. Sigh. */
45 heapbase = (void *)(((uintptr_t)base + MALLOCALIGN_MASK) &
46 ~MALLOCALIGN_MASK);
45 maxheap = (char *)top - (char *)heapbase;
46}
47
48char *
49sbrk(int incr)
50{
51 char *ret;
52
53 if ((heapsize + incr) <= maxheap) {
54 ret = (char *)heapbase + heapsize;
55 bzero(ret, incr);
56 heapsize += incr;
57 return(ret);
58 }
59 errno = ENOMEM;
60 return((char *)-1);
61}
62
47 maxheap = (char *)top - (char *)heapbase;
48}
49
50char *
51sbrk(int incr)
52{
53 char *ret;
54
55 if ((heapsize + incr) <= maxheap) {
56 ret = (char *)heapbase + heapsize;
57 bzero(ret, incr);
58 heapsize += incr;
59 return(ret);
60 }
61 errno = ENOMEM;
62 return((char *)-1);
63}
64