lfptostr.c revision 290001 
1/*
2 * This file contains test for both mfptoa and mfptoms (which uses dolfptoa),
3 * since all these functions are very similar. It also tests ulfptoa, which is
4 * a macro.
5 */
6
7#include "config.h"
8#include "ntp_stdlib.h"
9#include "ntp_fp.h"
10
11#include "unity.h"
12
13static const int LFP_MAX_PRECISION = 10;
14static const int LFP_MAX_PRECISION_MS = 7;
15
16static const int ONE_FOURTH = 1073741824; /* (1 << 30) */
17static const int HALF = (1 << 31);
18static const int THREE_FOURTH = -1073741824;
19static const int HALF_PROMILLE_UP = 2147484; /* slightly more than 0.0005 */
20static const int HALF_PROMILLE_DOWN = 2147483; /* slightly less than 0.0005 */
21
22
23void test_PositiveInteger(void);
24void test_NegativeInteger(void);
25void test_PositiveIntegerWithFraction(void);
26void test_NegativeIntegerWithFraction(void);
27void test_RoundingDownToInteger(void);
28void test_RoundingMiddleToInteger(void);
29void test_RoundingUpToInteger(void);
30void test_SingleDecimal(void);
31void test_MillisecondsRoundingUp(void);
32void test_MillisecondsRoundingDown(void);
33void test_UnsignedInteger(void);
34
35
36
37void
38test_PositiveInteger(void) {
39	l_fp test = {{200}, 0}; /* exact 200.0000000000 */
40
41	TEST_ASSERT_EQUAL_STRING("200.0000000000", mfptoa(test.l_ui, test.l_uf, LFP_MAX_PRECISION));
42	TEST_ASSERT_EQUAL_STRING("200000.0000000", mfptoms(test.l_ui, test.l_uf, LFP_MAX_PRECISION_MS));
43}
44
45void
46test_NegativeInteger(void) {
47	l_fp test = {{-100}, 0}; /* -100 */
48
49	TEST_ASSERT_EQUAL_STRING("-100.0000000000", lfptoa(&test, LFP_MAX_PRECISION));
50	TEST_ASSERT_EQUAL_STRING("-100000.0000000", lfptoms(&test, LFP_MAX_PRECISION_MS));
51}
52
53void
54test_PositiveIntegerWithFraction(void) {
55	l_fp test = {{200}, ONE_FOURTH}; /* 200.25 */
56
57	TEST_ASSERT_EQUAL_STRING("200.2500000000", lfptoa(&test, LFP_MAX_PRECISION));
58	TEST_ASSERT_EQUAL_STRING("200250.0000000", lfptoms(&test, LFP_MAX_PRECISION_MS));
59}
60
61void
62test_NegativeIntegerWithFraction(void) {
63	l_fp test = {{-100}, ONE_FOURTH}; /* -99.75 */
64
65	TEST_ASSERT_EQUAL_STRING("-99.7500000000", lfptoa(&test, LFP_MAX_PRECISION));
66	TEST_ASSERT_EQUAL_STRING("-99750.0000000", lfptoms(&test, LFP_MAX_PRECISION_MS));
67}
68
69void
70test_RoundingDownToInteger(void) {
71	l_fp test = {{10}, ONE_FOURTH}; /* 10.25 */
72
73	TEST_ASSERT_EQUAL_STRING("10", lfptoa(&test, 0));
74	TEST_ASSERT_EQUAL_STRING("10250", lfptoms(&test, 0));
75}
76
77void
78test_RoundingMiddleToInteger(void) {
79	l_fp test = {{10}, HALF}; /* 10.5 */
80
81	TEST_ASSERT_EQUAL_STRING("11", lfptoa(&test, 0));
82	TEST_ASSERT_EQUAL_STRING("10500", lfptoms(&test, 0));
83}
84
85void
86test_RoundingUpToInteger(void) {
87	l_fp test = {{5}, THREE_FOURTH}; /* 5.75 */
88
89	TEST_ASSERT_EQUAL_STRING("6", lfptoa(&test, 0));
90	TEST_ASSERT_EQUAL_STRING("5750", lfptoms(&test, 0));
91}
92
93void
94test_SingleDecimal(void) {
95	l_fp test = {{8}, ONE_FOURTH}; /* 8.25 */
96
97	TEST_ASSERT_EQUAL_STRING("8.3", lfptoa(&test, 1));
98	TEST_ASSERT_EQUAL_STRING("8250.0", lfptoms(&test, 1));
99}
100
101void
102test_MillisecondsRoundingUp(void) {
103	l_fp test = {{1}, HALF_PROMILLE_UP}; /* slightly more than 1.0005 */
104
105	TEST_ASSERT_EQUAL_STRING("1.0", lfptoa(&test, 1));
106
107	TEST_ASSERT_EQUAL_STRING("1000.5", lfptoms(&test, 1));
108	TEST_ASSERT_EQUAL_STRING("1001", lfptoms(&test, 0));
109}
110
111void
112test_MillisecondsRoundingDown(void) {
113	l_fp test = {{1}, HALF_PROMILLE_DOWN}; /* slightly less than 1.0005 */
114
115	TEST_ASSERT_EQUAL_STRING("1.0", lfptoa(&test, 1));
116
117	TEST_ASSERT_EQUAL_STRING("1000.5", lfptoms(&test, 1));
118	TEST_ASSERT_EQUAL_STRING("1000", lfptoms(&test, 0));
119}
120
121void test_UnsignedInteger(void) {
122	l_fp test = {{3000000000UL}, 0};
123
124	TEST_ASSERT_EQUAL_STRING("3000000000.0", ulfptoa(&test, 1));
125}
126