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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"). You may not use
* this file except in compliance with the License. A copy of the License is
* located at
*
* http://aws.amazon.com/apache2.0/
*
* or in the "license" file accompanying this file. This file is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing permissions and
* limitations under the License.
*/
#undef posix_memalign
#include <cbmc_proof/nondet.h>
#include <errno.h>
#include <stdlib.h>
/**
* Overrides the version of posix_memalign used by CBMC.
* The current CBMC model doesn't consider malloc may fail.
*/
int posix_memalign(void **ptr, __CPROVER_size_t alignment, __CPROVER_size_t size)
{
__CPROVER_HIDE:;
__CPROVER_size_t multiplier = alignment / sizeof(void *);
/* Modeling the posix_memalign checks on alignment. */
if (alignment % sizeof(void *) != 0 ||
((multiplier) & (multiplier - 1)) != 0 || alignment == 0) {
return EINVAL;
}
void *tmp = malloc(size);
if(tmp != NULL) {
*ptr = tmp;
return 0;
}
return ENOMEM;
}
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