powerpc: Avoid putting floating point values in memory [BZ #22189]
[glibc.git] / time / tst-mktime2.c
blobc41db3e3b72fd23dba0f00582f083224cf4522f8
1 /* Test program from Paul Eggert and Tony Leneis. */
3 #include <limits.h>
4 #include <time.h>
5 #include <stdlib.h>
6 #include <unistd.h>
8 /* True if the arithmetic type T is signed. */
9 #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
11 /* The maximum and minimum values for the integer type T. These
12 macros have undefined behavior if T is signed and has padding bits.
13 If this is a problem for you, please let us know how to fix it for
14 your host. */
15 #define TYPE_MINIMUM(t) \
16 ((t) (! TYPE_SIGNED (t) \
17 ? (t) 0 \
18 : ~ TYPE_MAXIMUM (t)))
19 #define TYPE_MAXIMUM(t) \
20 ((t) (! TYPE_SIGNED (t) \
21 ? (t) -1 \
22 : ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1)))
24 #ifndef TIME_T_MIN
25 # define TIME_T_MIN TYPE_MINIMUM (time_t)
26 #endif
27 #ifndef TIME_T_MAX
28 # define TIME_T_MAX TYPE_MAXIMUM (time_t)
29 #endif
31 /* Values we'll use to set the TZ environment variable. */
32 static const char *tz_strings[] =
34 (const char *) 0, "GMT0", "JST-9",
35 "EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
37 #define N_STRINGS ((int) (sizeof (tz_strings) / sizeof (tz_strings[0])))
39 /* Fail if mktime fails to convert a date in the spring-forward gap.
40 Based on a problem report from Andreas Jaeger. */
41 static void
42 spring_forward_gap (void)
44 /* glibc (up to about 1998-10-07) failed this test. */
45 struct tm tm;
47 /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
48 instead of "TZ=America/Vancouver" in order to detect the bug even
49 on systems that don't support the Olson extension, or don't have the
50 full zoneinfo tables installed. */
51 setenv ("TZ", "PST8PDT,M4.1.0,M10.5.0", 1);
53 tm.tm_year = 98;
54 tm.tm_mon = 3;
55 tm.tm_mday = 5;
56 tm.tm_hour = 2;
57 tm.tm_min = 0;
58 tm.tm_sec = 0;
59 tm.tm_isdst = -1;
60 if (mktime (&tm) == (time_t)-1)
61 exit (1);
64 static void
65 mktime_test1 (time_t now)
67 struct tm *lt = localtime (&now);
68 if (lt && mktime (lt) != now)
69 exit (2);
72 static void
73 mktime_test (time_t now)
75 mktime_test1 (now);
76 mktime_test1 ((time_t) (TIME_T_MAX - now));
77 mktime_test1 ((time_t) (TIME_T_MIN + now));
80 static void
81 irix_6_4_bug (void)
83 /* Based on code from Ariel Faigon. */
84 struct tm tm;
85 tm.tm_year = 96;
86 tm.tm_mon = 3;
87 tm.tm_mday = 0;
88 tm.tm_hour = 0;
89 tm.tm_min = 0;
90 tm.tm_sec = 0;
91 tm.tm_isdst = -1;
92 mktime (&tm);
93 if (tm.tm_mon != 2 || tm.tm_mday != 31)
94 exit (3);
97 static void
98 bigtime_test (int j)
100 struct tm tm;
101 time_t now;
102 tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
103 tm.tm_isdst = -1;
104 now = mktime (&tm);
105 if (now != (time_t) -1)
107 struct tm *lt = localtime (&now);
108 if (! (lt
109 && lt->tm_year == tm.tm_year
110 && lt->tm_mon == tm.tm_mon
111 && lt->tm_mday == tm.tm_mday
112 && lt->tm_hour == tm.tm_hour
113 && lt->tm_min == tm.tm_min
114 && lt->tm_sec == tm.tm_sec
115 && lt->tm_yday == tm.tm_yday
116 && lt->tm_wday == tm.tm_wday
117 && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
118 == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
119 exit (4);
123 static int
124 do_test (void)
126 time_t t, delta;
127 int i;
128 unsigned int j;
130 setenv ("TZ", "America/Sao_Paulo", 1);
131 /* This test makes some buggy mktime implementations loop.
132 Give up after 60 seconds; a mktime slower than that
133 isn't worth using anyway. */
134 alarm (60);
136 delta = TIME_T_MAX / 997; /* a suitable prime number */
137 for (i = 0; i < N_STRINGS; i++)
139 if (tz_strings[i])
140 setenv ("TZ", tz_strings[i], 1);
142 for (t = 0; t <= TIME_T_MAX - delta; t += delta)
143 mktime_test (t);
144 mktime_test ((time_t) 1);
145 mktime_test ((time_t) (60 * 60));
146 mktime_test ((time_t) (60 * 60 * 24));
148 for (j = 1; j <= INT_MAX; j *= 2)
149 bigtime_test (j);
150 bigtime_test (j - 1);
152 irix_6_4_bug ();
153 spring_forward_gap ();
154 return 0;
157 #define TEST_FUNCTION do_test ()
158 #include "../test-skeleton.c"