y2038-tests/test_difftime.c at master · lmajewski/y2038-tests · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
#include <time.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

#include "tests.h"

static void test_difftime_call(
  time_t time1,
  time_t time0,
  double expected_result)
{
  double result = difftime(time1, time0);
  if (result != expected_result)
    test_failure(0, "difftime(%lld,%lld) returned %g instead of %g", (long long) time1, (long long) time0, result, expected_result);
  else
    test_success();
}

void test_difftime(void)
{
  time_t time1, time0;

  test_begin("Check that difftime(+1800, -1800) == 3600");
  time1 = +1800; time0 = -1800; test_difftime_call(time1, time0, +3600.0);

  test_begin("Check that difftime(-1800, +1800) == -3600");
  time1 = -1800; time0 = +1800; test_difftime_call(time1, time0, -3600.0);

  test_begin("Check that difftime(Y2038+1799, Y2038-1801) == 3600");
  time1 = time0 = 0x7FFFFFFF; time1 += 1800; time0 -= 1800; test_difftime_call(time1, time0, +3600.0);

  test_begin("Check that difftime(Y2038+1800, Y2038-1800) == 3600");
  time1 = time0 = 0x80000000; time1 += 1800; time0 -= 1800; test_difftime_call(time1, time0, +3600.0);

  test_begin("Check that difftime(Y2038-1800, Y2038+1800) == -3600");
  time1 = time0 = 0x80000000; time1 -= 1800; time0 += 1800; test_difftime_call(time1, time0, -3600.0);

  test_begin("Check that difftime(Y2038-1801, Y2038-1799) == -3600");
  time1 = time0 = 0x7FFFFFFF; time1 -= 1800; time0 += 1800; test_difftime_call(time1, time0, -3600.0);
}