Concurrent I/O without threads
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/* threadless.io
* Copyright (c) 2016 Justin R. Cutler
* Licensed under the MIT License. See LICENSE file in the project root for
* full license information.
*/
/** @file
* allocation interface implementation
* @author Justin R. Cutler <justin.r.cutler@gmail.com>
*/
/* errno, ENOMEM */
#include <errno.h>
/* size_t, NULL */
#include <stddef.h>
/* ... */
#include <threadless/allocation.h>
#ifndef SIZE_MAX
# define SIZE_MAX ((size_t)-1)
#endif
#define SQRT_SIZE_MAX_PLUS_1 ((size_t)1 << (sizeof(size_t) * 4))
int allocation_realloc_array(allocation_t *allocation, size_t nmemb,
size_t size)
{
/* test for multiplication overflow */
if (((nmemb >= SQRT_SIZE_MAX_PLUS_1) || (size >= SQRT_SIZE_MAX_PLUS_1)) &&
(nmemb != 0) && ((SIZE_MAX / nmemb) < size)) {
/* overflow detected */
errno = ENOMEM;
return -1;
}
size_t alloc_size = nmemb * size;
/* perform allocator action */
return allocation->allocator->allocate(allocation, alloc_size);
}