File: main_bounded.c

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#include <stdlib.h>

const size_t MAX_SIZE = 5000000;
void foo(char *arr, size_t size)
  // clang-format off
__CPROVER_requires(size < MAX_SIZE)
__CPROVER_requires(__CPROVER_is_fresh(arr, size))
__CPROVER_assigns(__CPROVER_object_from(arr))
// clang-format on
{
  __CPROVER_assert(arr != NULL, "arr is not NULL");
  __CPROVER_assert(size < __CPROVER_max_malloc_size, "size is capped");
  if(size > 0)
  {
    arr[0] = 0;
    arr[size - 1] = 0;
  }
}

int main()
{
  char *arr;
  size_t size;
  foo(arr, size);
}