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https://github.com/cuberite/libdeflate.git
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f2c3a5b4e9
* Bring in common headers and program code from xpack project * Move program code to programs/ * Move library code to lib/ * GNU89 and MSVC2010 compatibility * Other changes
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/*
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* aligned_malloc.c - aligned memory allocation
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*
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* Written in 2014-2015 by Eric Biggers <ebiggers3@gmail.com>
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*
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* To the extent possible under law, the author(s) have dedicated all copyright
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* and related and neighboring rights to this software to the public domain
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* worldwide. This software is distributed without any warranty.
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*
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* You should have received a copy of the CC0 Public Domain Dedication along
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* with this software. If not, see
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* <http://creativecommons.org/publicdomain/zero/1.0/>.
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*/
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/*
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* This file provides portable aligned memory allocation functions that only
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* use malloc() and free(). This avoids portability problems with
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* posix_memalign(), aligned_alloc(), etc.
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*/
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#include <stdlib.h>
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#include "aligned_malloc.h"
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void *
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aligned_malloc(size_t alignment, size_t size)
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{
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const uintptr_t mask = alignment - 1;
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char *ptr = NULL;
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char *raw_ptr;
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raw_ptr = malloc(mask + sizeof(size_t) + size);
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if (raw_ptr) {
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ptr = (char *)raw_ptr + sizeof(size_t);
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ptr = (void *)(((uintptr_t)ptr + mask) & ~mask);
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*((size_t *)ptr - 1) = ptr - raw_ptr;
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}
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return ptr;
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}
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void
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aligned_free(void *ptr)
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{
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if (ptr)
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free((char *)ptr - *((size_t *)ptr - 1));
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}
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