1 /* Copyright (C) 1998-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <time.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <stdint.h>
23 #include <unistd.h>
24
25 int failed = 0;
26
27 struct test_times
28 {
29 const char *name;
30 int daylight;
31 int timezone;
32 const char *tzname[2];
33 };
34
35 static const struct test_times tests[] =
36 {
37 { "Europe/Amsterdam", 1, -3600, { "CET", "CEST" }},
38 { "Europe/Berlin", 1, -3600, { "CET", "CEST" }},
39 { "Europe/London", 1, 0, { "GMT", "BST" }},
40 { "Universal", 0, 0, {"UTC", "UTC" }},
41 { "Australia/Melbourne", 1, -36000, { "EST", "EST" }},
42 { "America/Sao_Paulo", 1, 10800, {"BRT", "BRST" }},
43 { "America/Chicago", 1, 21600, {"CST", "CDT" }},
44 { "America/Indiana/Indianapolis", 1, 18000, {"EST", "EDT" }},
45 { "America/Los_Angeles", 1, 28800, {"PST", "PDT" }},
46 { "Pacific/Auckland", 1, -43200, { "NZST", "NZDT" }},
47 { NULL, 0, 0 }
48 };
49
50 /* This string will be used for `putenv' calls. */
51 char envstring[100];
52
53 static void
54 print_tzvars (void)
55 {
56 printf ("tzname[0]: %s\n", tzname[0]);
57 printf ("tzname[1]: %s\n", tzname[1]);
58 printf ("daylight: %d\n", daylight);
59 printf ("timezone: %ld\n", timezone);
60 }
61
62
63 static void
64 check_tzvars (const char *name, int dayl, int timez, const char *const tznam[])
65 {
66 int i;
67
68 if (daylight != dayl)
69 {
70 printf ("*** Timezone: %s, daylight is: %d but should be: %d\n",
71 name, daylight, dayl);
72 ++failed;
73 }
74 if (timezone != timez)
75 {
76 printf ("*** Timezone: %s, timezone is: %ld but should be: %d\n",
77 name, timezone, timez);
78 ++failed;
79 }
80 for (i = 0; i <= 1; ++i)
81 if (strcmp (tzname[i], tznam[i]) != 0)
82 {
83 printf ("*** Timezone: %s, tzname[%d] is: %s but should be: %s\n",
84 name, i, tzname[i], tznam[i]);
85 ++failed;
86 }
87 }
88
89
90 static int
91 do_test (void)
92 {
93 time_t t;
94 const struct test_times *pt;
95 char buf[BUFSIZ];
96
97 /* This should be: Fri May 15 01:02:16 1998 (UTC). */
98 t = 895194136;
99 printf ("We use this date: %s\n", asctime (gmtime (&t)));
100
101 for (pt = tests; pt->name != NULL; ++pt)
102 {
103 /* Start with a known state */
104 printf ("Checking timezone %s\n", pt->name);
105 sprintf (buf, "TZ=%s", pt->name);
106 if (putenv (buf))
107 {
108 puts ("putenv failed.");
109 failed = 1;
110 }
111 tzset ();
112 print_tzvars ();
113 check_tzvars (pt->name, pt->daylight, pt->timezone, pt->tzname);
114
115 /* calling localtime shouldn't make a difference */
116 localtime (&t);
117 print_tzvars ();
118 check_tzvars (pt->name, pt->daylight, pt->timezone, pt->tzname);
119 }
120
121 /* From a post of Scott Harrington <seh4@ix.netcom.com> to the timezone
122 mailing list. */
123 {
124 struct tm tmBuf = {0, 0, 0, 10, 3, 98, 0, 0, -1};
125 char buf[200];
126 strcpy (envstring, "TZ=Europe/London");
127 putenv (envstring);
128 t = mktime (&tmBuf);
129 snprintf (buf, sizeof (buf), "TZ=%s %jd %d %d %d %d %d %d %d %d %d",
130 getenv ("TZ"), (intmax_t) t,
131 tmBuf.tm_sec, tmBuf.tm_min, tmBuf.tm_hour,
132 tmBuf.tm_mday, tmBuf.tm_mon, tmBuf.tm_year,
133 tmBuf.tm_wday, tmBuf.tm_yday, tmBuf.tm_isdst);
134 fputs (buf, stdout);
135 puts (" should be");
136 puts ("TZ=Europe/London 892162800 0 0 0 10 3 98 5 99 1");
137 if (strcmp (buf, "TZ=Europe/London 892162800 0 0 0 10 3 98 5 99 1") != 0)
138 {
139 failed = 1;
140 fputs (" FAILED ***", stdout);
141 }
142 }
143
144 printf("\n");
145
146 {
147 struct tm tmBuf = {0, 0, 0, 10, 3, 98, 0, 0, -1};
148 char buf[200];
149 strcpy (envstring, "TZ=GMT");
150 /* No putenv call needed! */
151 t = mktime (&tmBuf);
152 snprintf (buf, sizeof (buf), "TZ=%s %jd %d %d %d %d %d %d %d %d %d",
153 getenv ("TZ"), (intmax_t) t,
154 tmBuf.tm_sec, tmBuf.tm_min, tmBuf.tm_hour,
155 tmBuf.tm_mday, tmBuf.tm_mon, tmBuf.tm_year,
156 tmBuf.tm_wday, tmBuf.tm_yday, tmBuf.tm_isdst);
157 fputs (buf, stdout);
158 puts (" should be");
159 puts ("TZ=GMT 892166400 0 0 0 10 3 98 5 99 0");
160 if (strcmp (buf, "TZ=GMT 892166400 0 0 0 10 3 98 5 99 0") != 0)
161 {
162 failed = 1;
163 fputs (" FAILED ***", stdout);
164 }
165 }
166
167 return failed ? EXIT_FAILURE : EXIT_SUCCESS;
168 }
169
170 #define TEST_FUNCTION do_test ()
171 #include "../test-skeleton.c"