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Diffstat (limited to 'lib/libstand/zalloc_malloc.c')
| -rw-r--r-- | lib/libstand/zalloc_malloc.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/lib/libstand/zalloc_malloc.c b/lib/libstand/zalloc_malloc.c new file mode 100644 index 0000000..83e5290 --- /dev/null +++ b/lib/libstand/zalloc_malloc.c @@ -0,0 +1,197 @@ +/* + * This module derived from code donated to the FreeBSD Project by + * Matthew Dillon <dillon@backplane.com> + * + * Copyright (c) 1998 The FreeBSD Project + * 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. + * + * $FreeBSD$ + */ + +/* + * MALLOC.C - malloc equivalent, runs on top of zalloc and uses sbrk + */ + +#include "zalloc_defs.h" + +static MemPool MallocPool; + +#ifdef DMALLOCDEBUG +static int MallocMax; +static int MallocCount; + +void mallocstats(void); +#endif + +#ifdef malloc +#undef malloc +#undef free +#endif + +#ifdef __alpha__ +void +free_region(void *start, void *end) +{ + zextendPool(&MallocPool, start, (caddr_t)end - (caddr_t)start); + zfree(&MallocPool, start, (caddr_t)end - (caddr_t)start); +} +#endif + +void * +malloc(size_t bytes) +{ + Guard *res; + +#ifdef USEENDGUARD + bytes += MALLOCALIGN + 1; +#else + bytes += MALLOCALIGN; +#endif + + while ((res = znalloc(&MallocPool, bytes)) == NULL) { + int incr = (bytes + BLKEXTENDMASK) & ~BLKEXTENDMASK; + char *base; + + if ((base = sbrk(incr)) == (char *)-1) + return(NULL); + zextendPool(&MallocPool, base, incr); + zfree(&MallocPool, base, incr); + } +#ifdef DMALLOCDEBUG + if (++MallocCount > MallocMax) + MallocMax = MallocCount; +#endif +#ifdef USEGUARD + res->ga_Magic = GAMAGIC; +#endif + res->ga_Bytes = bytes; +#ifdef USEENDGUARD + *((char *)res + bytes - 1) = -2; +#endif + return((char *)res + MALLOCALIGN); +} + +void +free(void *ptr) +{ + size_t bytes; + + if (ptr != NULL) { + Guard *res = (void *)((char *)ptr - MALLOCALIGN); + +#ifdef USEGUARD + if (res->ga_Magic != GAMAGIC) + panic("free: guard1 fail @ %p", ptr); + res->ga_Magic = -1; +#endif +#ifdef USEENDGUARD + if (*((char *)res + res->ga_Bytes - 1) != -2) + panic("free: guard2 fail @ %p + %d", ptr, res->ga_Bytes - MALLOCALIGN); + *((char *)res + res->ga_Bytes - 1) = -1; +#endif + + bytes = res->ga_Bytes; + zfree(&MallocPool, res, bytes); +#ifdef DMALLOCDEBUG + --MallocCount; +#endif + } +} + + +void * +calloc(size_t n1, size_t n2) +{ + iaddr_t bytes = (iaddr_t)n1 * (iaddr_t)n2; + void *res; + + if ((res = malloc(bytes)) != NULL) { + bzero(res, bytes); +#ifdef DMALLOCDEBUG + if (++MallocCount > MallocMax) + MallocMax = MallocCount; +#endif + } + return(res); +} + +/* + * realloc() - I could be fancier here and free the old buffer before + * allocating the new one (saving potential fragmentation + * and potential buffer copies). But I don't bother. + */ + +void * +realloc(void *ptr, size_t size) +{ + void *res; + size_t old; + + if ((res = malloc(size)) != NULL) { + if (ptr) { + old = *(size_t *)((char *)ptr - MALLOCALIGN) - MALLOCALIGN; + if (old < size) + bcopy(ptr, res, old); + else + bcopy(ptr, res, size); + free(ptr); + } else { +#ifdef DMALLOCDEBUG + if (++MallocCount > MallocMax) + MallocMax = MallocCount; +#ifdef EXITSTATS + if (DidAtExit == 0) { + DidAtExit = 1; + atexit(mallocstats); + } +#endif +#endif + } + } + return(res); +} + +void * +reallocf(void *ptr, size_t size) +{ + void *res; + + if ((res = realloc(ptr, size)) == NULL) + free(ptr); + return(res); +} + +#ifdef DMALLOCDEBUG + +void +mallocstats(void) +{ + printf("Active Allocations: %d/%d\n", MallocCount, MallocMax); +#ifdef ZALLOCDEBUG + zallocstats(&MallocPool); +#endif +} + +#endif + |
