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/// @file
/// @brief unit test for overflow.h
#include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
// were we asked to test the fallback C code?
#ifdef SUPPRESS_BUILTINS
#ifdef __GNUC__
#undef __GNUC__
#endif
#ifdef __clang__
#undef __clang__
#endif
#endif
#include <util/overflow.h>
/// a test case
typedef struct {
int operand1; ///< left-hand side
int operand2; ///< right-hand side
bool should_overflow; ///< should addition be expected to overflow?
} testcase_t;
/// cases to run
static const testcase_t TESTS[] = {
{.operand1 = 0, .operand2 = 0},
{.operand1 = 0, .operand2 = 1},
{.operand1 = 0, .operand2 = -1},
{.operand1 = 0, .operand2 = 2},
{.operand1 = 0, .operand2 = -2},
{.operand1 = 0, .operand2 = INT_MAX},
{.operand1 = 0, .operand2 = INT_MIN},
{.operand1 = 0, .operand2 = INT_MAX - 1},
{.operand1 = 0, .operand2 = INT_MIN + 1},
{.operand1 = 1, .operand2 = 0},
{.operand1 = 1, .operand2 = 1},
{.operand1 = 1, .operand2 = -1},
{.operand1 = 1, .operand2 = 2},
{.operand1 = 1, .operand2 = -2},
{.operand1 = 1, .operand2 = INT_MAX, .should_overflow = true},
{.operand1 = 1, .operand2 = INT_MIN},
{.operand1 = 1, .operand2 = INT_MAX - 1},
{.operand1 = 1, .operand2 = INT_MIN + 1},
{.operand1 = -1, .operand2 = 0},
{.operand1 = -1, .operand2 = 1},
{.operand1 = -1, .operand2 = -1},
{.operand1 = -1, .operand2 = 2},
{.operand1 = -1, .operand2 = -2},
{.operand1 = -1, .operand2 = INT_MAX},
{.operand1 = -1, .operand2 = INT_MIN, .should_overflow = true},
{.operand1 = -1, .operand2 = INT_MAX - 1},
{.operand1 = -1, .operand2 = INT_MIN + 1},
{.operand1 = 2, .operand2 = 0},
{.operand1 = 2, .operand2 = 1},
{.operand1 = 2, .operand2 = -1},
{.operand1 = 2, .operand2 = 2},
{.operand1 = 2, .operand2 = -2},
{.operand1 = 2, .operand2 = INT_MAX, .should_overflow = true},
{.operand1 = 2, .operand2 = INT_MIN},
{.operand1 = 2, .operand2 = INT_MAX - 1, .should_overflow = true},
{.operand1 = 2, .operand2 = INT_MIN + 1},
{.operand1 = -2, .operand2 = 0},
{.operand1 = -2, .operand2 = 1},
{.operand1 = -2, .operand2 = -1},
{.operand1 = -2, .operand2 = 2},
{.operand1 = -2, .operand2 = -2},
{.operand1 = -2, .operand2 = INT_MAX},
{.operand1 = -2, .operand2 = INT_MIN, .should_overflow = true},
{.operand1 = -2, .operand2 = INT_MAX - 1},
{.operand1 = -2, .operand2 = INT_MIN + 1, .should_overflow = true},
{.operand1 = INT_MAX, .operand2 = 0},
{.operand1 = INT_MAX, .operand2 = 1, .should_overflow = true},
{.operand1 = INT_MAX, .operand2 = -1},
{.operand1 = INT_MAX, .operand2 = 2, .should_overflow = true},
{.operand1 = INT_MAX, .operand2 = -2},
{.operand1 = INT_MAX, .operand2 = INT_MAX, .should_overflow = true},
{.operand1 = INT_MAX, .operand2 = INT_MIN},
{.operand1 = INT_MAX, .operand2 = INT_MAX - 1, .should_overflow = true},
{.operand1 = INT_MAX, .operand2 = INT_MIN + 1},
{.operand1 = INT_MIN, .operand2 = 0},
{.operand1 = INT_MIN, .operand2 = 1},
{.operand1 = INT_MIN, .operand2 = -1, .should_overflow = true},
{.operand1 = INT_MIN, .operand2 = 2},
{.operand1 = INT_MIN, .operand2 = -2, .should_overflow = true},
{.operand1 = INT_MIN, .operand2 = INT_MAX},
{.operand1 = INT_MIN, .operand2 = INT_MIN, .should_overflow = true},
{.operand1 = INT_MIN, .operand2 = INT_MAX - 1},
{.operand1 = INT_MIN, .operand2 = INT_MIN + 1, .should_overflow = true},
{.operand1 = INT_MAX - 1, .operand2 = 0},
{.operand1 = INT_MAX - 1, .operand2 = 1},
{.operand1 = INT_MAX - 1, .operand2 = -1},
{.operand1 = INT_MAX - 1, .operand2 = 2, .should_overflow = true},
{.operand1 = INT_MAX - 1, .operand2 = -2},
{.operand1 = INT_MAX - 1, .operand2 = INT_MAX, .should_overflow = true},
{.operand1 = INT_MAX - 1, .operand2 = INT_MIN},
{.operand1 = INT_MAX - 1, .operand2 = INT_MAX - 1, .should_overflow = true},
{.operand1 = INT_MAX - 1, .operand2 = INT_MIN + 1},
{.operand1 = INT_MIN + 1, .operand2 = 0},
{.operand1 = INT_MIN + 1, .operand2 = 1},
{.operand1 = INT_MIN + 1, .operand2 = -1},
{.operand1 = INT_MIN + 1, .operand2 = 2},
{.operand1 = INT_MIN + 1, .operand2 = -2, .should_overflow = true},
{.operand1 = INT_MIN + 1, .operand2 = INT_MAX},
{.operand1 = INT_MIN + 1, .operand2 = INT_MIN, .should_overflow = true},
{.operand1 = INT_MIN + 1, .operand2 = INT_MAX - 1},
{.operand1 = INT_MIN + 1, .operand2 = INT_MIN + 1, .should_overflow = true},
};
int main(void) {
for (size_t i = 0; i < sizeof(TESTS) / sizeof(TESTS[0]); ++i) {
const int op1 = TESTS[i].operand1;
const int op2 = TESTS[i].operand2;
int answer;
const bool did_overflow = sadd_overflow(op1, op2, &answer);
const bool should_overflow = TESTS[i].should_overflow;
if (did_overflow != should_overflow) {
fprintf(stderr, "%d + %d should%s have overflowed and it did%s\n", op1,
op2, should_overflow ? "" : " not", did_overflow ? "" : " not");
return EXIT_FAILURE;
}
if (!did_overflow && op1 + op2 != answer) {
fprintf(stderr, "%d + %d is %d but result was %d\n", op1, op2, op1 + op2,
answer);
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}
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