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46 lines
2.6 KiB
C
46 lines
2.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/mem/hook.internal.h"
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#include "libc/mem/mem.h"
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#include "third_party/dlmalloc/dlmalloc.h"
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size_t (*hook_malloc_usable_size)(void *) = dlmalloc_usable_size;
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/**
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* Returns the number of bytes you can actually use in
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* an allocated chunk, which may be more than you requested
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* (although often not) due to alignment and minimum size
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* constraints.
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*
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* You can use this many bytes without worrying about overwriting
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* other allocated objects. This is not a particularly great
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* programming practice. malloc_usable_size can be more useful in
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* debugging and assertions, for example:
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*
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* p = malloc(n)
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* assert(malloc_usable_size(p) >= 256)
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*
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* @param p is address of allocation
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* @return total number of bytes
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* @see dlmalloc_usable_size()
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* @threadsafe
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*/
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size_t malloc_usable_size(void *p) {
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return hook_malloc_usable_size(p);
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}
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