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#include <assert.h>
#include <stdlib.h>
// type of functions that manipulate arrays
typedef void (*arr_fun_t)(char *arr, size_t size);
// A contract for the arr_fun_t type
void arr_fun_contract(char *arr, size_t size)
// clang-format off
__CPROVER_requires(size > 0 && __CPROVER_is_fresh(arr, size))
__CPROVER_assigns(arr[0])
__CPROVER_ensures(arr[0] == 0)
// clang-format on
;
arr_fun_t get_arr_fun()
// clang-format off
__CPROVER_ensures(
__CPROVER_obeys_contract(__CPROVER_return_value, arr_fun_contract))
// clang-format on
;
void foo(char *arr, size_t size)
// clang-format off
__CPROVER_requires(size > 0 && __CPROVER_is_fresh(arr, size))
__CPROVER_assigns(arr[0])
__CPROVER_ensures(arr[0] == 0)
// clang-format on
{
// obtain function pointer from provider
arr_fun_t arr_fun = get_arr_fun();
// use it
CALL:
arr_fun(arr, size);
}
void main()
{
char *arr;
size_t size;
foo(arr, size);
}
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