* sysdeps/unix/sysv/linux/configure.in: Bump minimal kernel
[glibc.git] / time / tst-mktime2.c
blob0e4fd1e786392aa9b94458020a0fa94468cd31f3
1 /* Test program from Paul Eggert and Tony Leneis. */
2 #include <time.h>
3 #include <stdlib.h>
4 #include <unistd.h>
6 static time_t time_t_max;
7 static time_t time_t_min;
9 /* Values we'll use to set the TZ environment variable. */
10 static const char *tz_strings[] =
12 (const char *) 0, "GMT0", "JST-9",
13 "EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
15 #define N_STRINGS ((int) (sizeof (tz_strings) / sizeof (tz_strings[0])))
17 /* Fail if mktime fails to convert a date in the spring-forward gap.
18 Based on a problem report from Andreas Jaeger. */
19 static void
20 spring_forward_gap (void)
22 /* glibc (up to about 1998-10-07) failed this test. */
23 struct tm tm;
25 /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
26 instead of "TZ=America/Vancouver" in order to detect the bug even
27 on systems that don't support the Olson extension, or don't have the
28 full zoneinfo tables installed. */
29 setenv ("TZ", "PST8PDT,M4.1.0,M10.5.0", 1);
31 tm.tm_year = 98;
32 tm.tm_mon = 3;
33 tm.tm_mday = 5;
34 tm.tm_hour = 2;
35 tm.tm_min = 0;
36 tm.tm_sec = 0;
37 tm.tm_isdst = -1;
38 if (mktime (&tm) == (time_t)-1)
39 exit (1);
42 static void
43 mktime_test1 (time_t now)
45 struct tm *lt = localtime (&now);
46 if (lt && mktime (lt) != now)
47 exit (2);
50 static void
51 mktime_test (time_t now)
53 mktime_test1 (now);
54 mktime_test1 ((time_t) (time_t_max - now));
55 mktime_test1 ((time_t) (time_t_min + now));
58 static void
59 irix_6_4_bug (void)
61 /* Based on code from Ariel Faigon. */
62 struct tm tm;
63 tm.tm_year = 96;
64 tm.tm_mon = 3;
65 tm.tm_mday = 0;
66 tm.tm_hour = 0;
67 tm.tm_min = 0;
68 tm.tm_sec = 0;
69 tm.tm_isdst = -1;
70 mktime (&tm);
71 if (tm.tm_mon != 2 || tm.tm_mday != 31)
72 exit (3);
75 static void
76 bigtime_test (int j)
78 struct tm tm;
79 time_t now;
80 tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
81 tm.tm_isdst = -1;
82 now = mktime (&tm);
83 if (now != (time_t) -1)
85 struct tm *lt = localtime (&now);
86 if (! (lt
87 && lt->tm_year == tm.tm_year
88 && lt->tm_mon == tm.tm_mon
89 && lt->tm_mday == tm.tm_mday
90 && lt->tm_hour == tm.tm_hour
91 && lt->tm_min == tm.tm_min
92 && lt->tm_sec == tm.tm_sec
93 && lt->tm_yday == tm.tm_yday
94 && lt->tm_wday == tm.tm_wday
95 && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
96 == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
97 exit (4);
101 static int
102 do_test (void)
104 time_t t, delta;
105 int i;
106 unsigned int j;
108 setenv ("TZ", "America/Sao_Paulo", 1);
109 /* This test makes some buggy mktime implementations loop.
110 Give up after 60 seconds; a mktime slower than that
111 isn't worth using anyway. */
112 alarm (60);
114 for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
115 continue;
116 time_t_max--;
117 if ((time_t) -1 < 0)
118 for (time_t_min = -1; (time_t) (time_t_min * 2) < 0; time_t_min *= 2)
119 continue;
120 delta = time_t_max / 997; /* a suitable prime number */
121 for (i = 0; i < N_STRINGS; i++)
123 if (tz_strings[i])
124 setenv ("TZ", tz_strings[i], 1);
126 for (t = 0; t <= time_t_max - delta; t += delta)
127 mktime_test (t);
128 mktime_test ((time_t) 1);
129 mktime_test ((time_t) (60 * 60));
130 mktime_test ((time_t) (60 * 60 * 24));
132 for (j = 1; j <= INT_MAX; j *= 2)
133 bigtime_test (j);
134 bigtime_test (j - 1);
136 irix_6_4_bug ();
137 spring_forward_gap ();
138 return 0;
141 #define TEST_FUNCTION do_test ()
142 #include "../test-skeleton.c"