1 /* $NetBSD: lfptostr.c,v 1.2 2020/05/25 20:47:36 christos Exp $ */
2
3 /*
4 * This file contains test for both mfptoa and mfptoms (which uses dolfptoa),
5 * since all these functions are very similar. It also tests ulfptoa, which is
6 * a macro.
7 */
8
9 #include "config.h"
10 #include "ntp_stdlib.h"
11 #include "ntp_fp.h"
12
13 #include "unity.h"
14
15 static const int LFP_MAX_PRECISION = 10;
16 static const int LFP_MAX_PRECISION_MS = 7;
17
18 static const int ONE_FOURTH = 1073741824; /* (1 << 30) */
19 static const int HALF = (1 << 31);
20 static const int THREE_FOURTH = -1073741824;
21 static const int HALF_PROMILLE_UP = 2147484; /* slightly more than 0.0005 */
22 static const int HALF_PROMILLE_DOWN = 2147483; /* slightly less than 0.0005 */
23
24
25 void setUp(void);
26 void test_PositiveInteger(void);
27 void test_NegativeInteger(void);
28 void test_PositiveIntegerWithFraction(void);
29 void test_NegativeIntegerWithFraction(void);
30 void test_RoundingDownToInteger(void);
31 void test_RoundingMiddleToInteger(void);
32 void test_RoundingUpToInteger(void);
33 void test_SingleDecimal(void);
34 void test_MillisecondsRoundingUp(void);
35 void test_MillisecondsRoundingDown(void);
36 void test_UnsignedInteger(void);
37
38
39 void
setUp(void)40 setUp(void)
41 {
42 init_lib();
43
44 return;
45 }
46
47
48 void
test_PositiveInteger(void)49 test_PositiveInteger(void) {
50 l_fp test = {{200}, 0}; /* exact 200.0000000000 */
51
52 TEST_ASSERT_EQUAL_STRING("+200.0000000000", mfptoa(test.l_ui, test.l_uf, LFP_MAX_PRECISION));
53 TEST_ASSERT_EQUAL_STRING("+200000.0000000", mfptoms(test.l_ui, test.l_uf, LFP_MAX_PRECISION_MS));
54 }
55
56 void
test_NegativeInteger(void)57 test_NegativeInteger(void) {
58 l_fp test = {{-100}, 0}; /* -100 */
59
60 TEST_ASSERT_EQUAL_STRING("-100.0000000000", lfptoa(&test, LFP_MAX_PRECISION));
61 TEST_ASSERT_EQUAL_STRING("-100000.0000000", lfptoms(&test, LFP_MAX_PRECISION_MS));
62 }
63
64 void
test_PositiveIntegerWithFraction(void)65 test_PositiveIntegerWithFraction(void) {
66 l_fp test = {{200}, ONE_FOURTH}; /* 200.25 */
67
68 TEST_ASSERT_EQUAL_STRING("+200.2500000000", lfptoa(&test, LFP_MAX_PRECISION));
69 TEST_ASSERT_EQUAL_STRING("+200250.0000000", lfptoms(&test, LFP_MAX_PRECISION_MS));
70 }
71
72 void
test_NegativeIntegerWithFraction(void)73 test_NegativeIntegerWithFraction(void) {
74 l_fp test = {{-100}, ONE_FOURTH}; /* -99.75 */
75
76 TEST_ASSERT_EQUAL_STRING("-99.7500000000", lfptoa(&test, LFP_MAX_PRECISION));
77 TEST_ASSERT_EQUAL_STRING("-99750.0000000", lfptoms(&test, LFP_MAX_PRECISION_MS));
78 }
79
80 void
test_RoundingDownToInteger(void)81 test_RoundingDownToInteger(void) {
82 l_fp test = {{10}, ONE_FOURTH}; /* 10.25 */
83
84 TEST_ASSERT_EQUAL_STRING("+10", lfptoa(&test, 0));
85 TEST_ASSERT_EQUAL_STRING("+10250", lfptoms(&test, 0));
86 }
87
88 void
test_RoundingMiddleToInteger(void)89 test_RoundingMiddleToInteger(void) {
90 l_fp test = {{10}, HALF}; /* 10.5 */
91
92 TEST_ASSERT_EQUAL_STRING("+11", lfptoa(&test, 0));
93 TEST_ASSERT_EQUAL_STRING("+10500", lfptoms(&test, 0));
94 }
95
96 void
test_RoundingUpToInteger(void)97 test_RoundingUpToInteger(void) {
98 l_fp test = {{5}, THREE_FOURTH}; /* 5.75 */
99
100 TEST_ASSERT_EQUAL_STRING("+6", lfptoa(&test, 0));
101 TEST_ASSERT_EQUAL_STRING("+5750", lfptoms(&test, 0));
102 }
103
104 void
test_SingleDecimal(void)105 test_SingleDecimal(void) {
106 l_fp test = {{8}, ONE_FOURTH}; /* 8.25 */
107
108 TEST_ASSERT_EQUAL_STRING("+8.3", lfptoa(&test, 1));
109 TEST_ASSERT_EQUAL_STRING("+8250.0", lfptoms(&test, 1));
110 }
111
112 void
test_MillisecondsRoundingUp(void)113 test_MillisecondsRoundingUp(void) {
114 l_fp test = {{1}, HALF_PROMILLE_UP}; /* slightly more than 1.0005 */
115
116 TEST_ASSERT_EQUAL_STRING("+1.0", lfptoa(&test, 1));
117
118 TEST_ASSERT_EQUAL_STRING("+1000.5", lfptoms(&test, 1));
119 TEST_ASSERT_EQUAL_STRING("+1001", lfptoms(&test, 0));
120 }
121
122 void
test_MillisecondsRoundingDown(void)123 test_MillisecondsRoundingDown(void) {
124 l_fp test = {{1}, HALF_PROMILLE_DOWN}; /* slightly less than 1.0005 */
125
126 TEST_ASSERT_EQUAL_STRING("+1.0", lfptoa(&test, 1));
127
128 TEST_ASSERT_EQUAL_STRING("+1000.5", lfptoms(&test, 1));
129 TEST_ASSERT_EQUAL_STRING("+1000", lfptoms(&test, 0));
130 }
131
test_UnsignedInteger(void)132 void test_UnsignedInteger(void) {
133 l_fp test = {{3000000000UL}, 0};
134
135 TEST_ASSERT_EQUAL_STRING("3000000000.0", ulfptoa(&test, 1));
136 }
137