1 /* $NetBSD: tvtots.c,v 1.2 2020/05/25 20:47:36 christos Exp $ */
2
3 #include "config.h"
4
5 #include "lfptest.h"
6 #include "timevalops.h"
7
8 #include "unity.h"
9
10 #include <math.h> /* Required on Solaris for ldexp. */
11
12 void test_Seconds(void);
13 void test_MicrosecondsRounded(void);
14 void test_MicrosecondsExact(void);
15
16 void
test_Seconds(void)17 test_Seconds(void)
18 {
19 struct timeval input = {500, 0}; /* 500.0 s */
20 l_fp expected = {{500}, 0};
21 l_fp actual;
22
23 TVTOTS(&input, &actual);
24
25 TEST_ASSERT_TRUE(IsEqual(expected, actual));
26 }
27
28
29 void
test_MicrosecondsRounded(void)30 test_MicrosecondsRounded(void)
31 {
32 /* 0.0005 can not be represented exact in a l_fp structure.
33 * It would equal to 2147483,648. This means that
34 * HALF_PROMILLE_UP (which is 2147484) should be
35 * the correct rounding. */
36
37 struct timeval input = {0, 500}; /* 0.0005 exact */
38 l_fp expected = {{0}, HALF_PROMILLE_UP};
39 l_fp actual;
40
41 TVTOTS(&input, &actual);
42
43 TEST_ASSERT_TRUE(IsEqual(expected, actual));
44 }
45
46
47 void
test_MicrosecondsExact(void)48 test_MicrosecondsExact(void)
49 {
50 /* 0.5 can be represented exact in both l_fp and timeval. */
51 const struct timeval input = {10, 500000}; /* 0.5 exact */
52 const l_fp expected = {{10}, HALF}; /* 0.5 exact */
53 l_fp actual;
54
55 TVTOTS(&input, &actual);
56
57 /* Compare the fractional part with an absolute error given. */
58 TEST_ASSERT_EQUAL_UINT(expected.l_ui, actual.l_ui);
59
60 double expectedDouble, actualDouble;
61 M_LFPTOD(0, expected.l_uf, expectedDouble);
62 M_LFPTOD(0, actual.l_uf, actualDouble);
63
64 /* The error should be less than 0.5 us */
65 TEST_ASSERT_DOUBLE_WITHIN(0.0000005, expectedDouble, actualDouble);
66 }
67