posix_memalign.c

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#include <aligned_malloc.h>
#include <assert.h>
#include <errno.h>
#include <stddef.h>

#define IS_POWER_2(x) (!((x) & ((x)-1)))

int posix_memalign(void** __memptr, size_t __alignment, size_t __size)
{
    int r = ENOMEM;

    assert(__memptr);
    assert(__size > 0);

    // TODO: Do we need to check if __alignment is a multiple of sizeof(void *)?
    if(!IS_POWER_2(__alignment))
    {
        r = EINVAL;
    }
    else
    {
        *__memptr = aligned_malloc(__alignment, __size);

        if(*__memptr != NULL)
        {
            r = 0;
        }
    }

    return r;
}