1 /*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12 /*
13 * Copyright 2026 Oxide Computer Company
14 */
15
16 /*
17 * Regression test for illumos#18091 where the current time has different time
18 * zone names than a past or future time. Prior to this test strftime would
19 * report time zone names based on the current time.
20 */
21
22 #include <err.h>
23 #include <stdlib.h>
24 #include <time.h>
25 #include <stdbool.h>
26 #include <string.h>
27 #include <sys/sysmacros.h>
28
29 typedef struct st_test {
30 const char *st_tz;
31 long st_time;
32 const char *st_exp;
33 } st_test_t;
34
35 const st_test_t st_tests[] = { {
36 /*
37 * America/Vancouver moved to MST in tzdata2026b. However, at the time,
38 * the current information would have had it in PST/PDT.
39 */
40 .st_tz = "America/Vancouver",
41 .st_time = 1798790400,
42 .st_exp = "MST"
43 }, {
44 .st_tz = "America/Vancouver",
45 .st_time = 1777569072,
46 .st_exp = "PDT"
47 }, {
48 /*
49 * The other way this was originally reported.
50 */
51 .st_tz = "Europe/Kyiv",
52 .st_time = 500000000,
53 .st_exp = "MSK"
54 }, {
55 .st_tz = "Europe/Kyiv",
56 .st_time = 700000000,
57 .st_exp = "EET"
58 } };
59
60 static bool
st_test_one(const st_test_t * test)61 st_test_one(const st_test_t *test)
62 {
63 struct tm *tm;
64 char buf[32];
65
66 (void) setenv("TZ", test->st_tz, 1);
67 tm = localtime(&test->st_time);
68 if (tm == NULL) {
69 warn("TEST FAILED: %s (%ld): failed to convert to struct tm",
70 test->st_tz, test->st_time);
71 return (false);
72 }
73
74 if (strftime(buf, sizeof (buf), "%Z", tm) == 0) {
75 warnx("TEST FAILED: %s (%ld): strftime wrote no data",
76 test->st_tz, test->st_time);
77 return (false);
78 }
79
80 if (strcmp(buf, test->st_exp) != 0) {
81 warnx("TEST FAILED: %s (%ld): tz mismatch: found %s, expected "
82 "%s", test->st_tz, test->st_time, buf, test->st_exp);
83 return (false);
84 }
85
86 return (true);
87 }
88
89 int
main(void)90 main(void)
91 {
92 int ret = EXIT_SUCCESS;
93
94 for (size_t i = 0; i < ARRAY_SIZE(st_tests); i++) {
95 if (!st_test_one(&st_tests[i]))
96 ret = EXIT_FAILURE;
97 }
98
99 if (ret == EXIT_SUCCESS) {
100 (void) printf("All tests passed successfully!\n");
101 }
102 return (ret);
103 }
104