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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
/**
* FUNCTION: memcpy
*
* This function overrides the original implementation of the memcpy function
* from string.h. It copies the values of n bytes from the *src to the *dst.
* It also checks if the size of the arrays pointed to by both the *dst and
* *src parameters are at least n bytes and if they overlap.
*/
#undef memcpy
#include <proof_helpers/nondet.h>
#include <stdint.h>
/**
* Override the version of memcpy used by CBMC.
*/
void *memcpy_impl(void *dst, const void *src, size_t n) {
__CPROVER_precondition(
__CPROVER_POINTER_OBJECT(dst) != __CPROVER_POINTER_OBJECT(src) ||
((const char *)src >= (const char *)dst + n) || ((const char *)dst >= (const char *)src + n),
"memcpy src/dst overlap");
__CPROVER_precondition(__CPROVER_r_ok(src, n), "memcpy source region readable");
__CPROVER_precondition(__CPROVER_w_ok(dst, n), "memcpy destination region writeable");
for (__CPROVER_size_t i = 0; i < n; ++i)
((char *)dst)[i] = ((const char *)src)[i];
return dst;
}
void *memcpy(void *dst, const void *src, size_t n) {
return memcpy_impl(dst, src, n);
}
void *__builtin___memcpy_chk(void *dst, const void *src, __CPROVER_size_t n, __CPROVER_size_t size) {
(void)size;
return memcpy_impl(dst, src, n);
}
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