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784761be JM |
1 | /* Test for correct rounding of printf floating-point output. |
2 | Copyright (C) 2012 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <fenv.h> | |
20 | #include <stdio.h> | |
21 | #include <string.h> | |
22 | ||
23 | struct dec_test { | |
24 | double d; | |
25 | const char *fmt; | |
26 | const char *rd, *rn, *rz, *ru; | |
27 | }; | |
28 | ||
29 | static const struct dec_test dec_tests[] = { | |
30 | { 1.5, "%.0f", "1", "2", "1", "2" }, | |
31 | { -1.5, "%.0f", "-2", "-2", "-1", "-1" }, | |
32 | { 2.5, "%.0f", "2", "2", "2", "3" }, | |
33 | { -2.5, "%.0f", "-3", "-2", "-2", "-2" }, | |
34 | { 1.4999, "%.0f", "1", "1", "1", "2" }, | |
35 | { -1.4999, "%.0f", "-2", "-1", "-1", "-1" }, | |
36 | { 1.5001, "%.0f", "1", "2", "1", "2" }, | |
37 | { -1.5001, "%.0f", "-2", "-2", "-1", "-1" }, | |
38 | { 2.4999, "%.0f", "2", "2", "2", "3" }, | |
39 | { -2.4999, "%.0f", "-3", "-2", "-2", "-2" }, | |
40 | { 2.5001, "%.0f", "2", "3", "2", "3" }, | |
41 | { -2.5001, "%.0f", "-3", "-3", "-2", "-2" }, | |
42 | { 1.0 / 3.0, "%f", "0.333333", "0.333333", "0.333333", "0.333334" }, | |
43 | { -1.0 / 3.0, "%f", "-0.333334", "-0.333333", "-0.333333", "-0.333333" }, | |
44 | { 0.2500001, "%.2e", "2.50e-01", "2.50e-01", "2.50e-01", "2.51e-01" }, | |
45 | { -0.2500001, "%.2e", "-2.51e-01", "-2.50e-01", "-2.50e-01", "-2.50e-01" }, | |
46 | { 1000001.0, "%.1e", "1.0e+06", "1.0e+06", "1.0e+06", "1.1e+06" }, | |
47 | { -1000001.0, "%.1e", "-1.1e+06", "-1.0e+06", "-1.0e+06", "-1.0e+06" }, | |
48 | }; | |
49 | ||
50 | static int | |
51 | test_dec_in_one_mode (double d, const char *fmt, const char *expected, | |
52 | const char *mode_name) | |
53 | { | |
54 | char buf[100]; | |
55 | int ret = snprintf (buf, sizeof buf, fmt, d); | |
56 | if (ret <= 0 || ret >= (int) sizeof buf) | |
57 | { | |
58 | printf ("snprintf for %a returned %d\n", d, ret); | |
59 | return 1; | |
60 | } | |
61 | if (strcmp (buf, expected) == 0) | |
62 | return 0; | |
63 | else | |
64 | { | |
65 | printf ("snprintf (\"%s\", %a) returned \"%s\" not \"%s\" (%s)\n", | |
66 | fmt, d, buf, expected, mode_name); | |
67 | return 1; | |
68 | } | |
69 | } | |
70 | ||
71 | static int | |
72 | do_test (void) | |
73 | { | |
74 | int save_round_mode = fegetround (); | |
75 | int result = 0; | |
76 | ||
77 | for (size_t i = 0; i < sizeof (dec_tests) / sizeof (dec_tests[0]); i++) | |
78 | { | |
79 | result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt, | |
80 | dec_tests[i].rn, "default rounding mode"); | |
81 | #ifdef FE_DOWNWARD | |
82 | if (!fesetround (FE_DOWNWARD)) | |
83 | { | |
84 | result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt, | |
85 | dec_tests[i].rd, "FE_DOWNWARD"); | |
86 | fesetround (save_round_mode); | |
87 | } | |
88 | #endif | |
89 | #ifdef FE_TOWARDZERO | |
90 | if (!fesetround (FE_TOWARDZERO)) | |
91 | { | |
92 | result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt, | |
93 | dec_tests[i].rz, "FE_TOWARDZERO"); | |
94 | fesetround (save_round_mode); | |
95 | } | |
96 | #endif | |
97 | #ifdef FE_UPWARD | |
98 | if (!fesetround (FE_UPWARD)) | |
99 | { | |
100 | result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt, | |
101 | dec_tests[i].ru, "FE_UPWARD"); | |
102 | fesetround (save_round_mode); | |
103 | } | |
104 | #endif | |
105 | } | |
106 | return result; | |
107 | } | |
108 | ||
109 | #define TEST_FUNCTION do_test () | |
110 | #include "../test-skeleton.c" |