Commit | Line | Data |
233e9d1c |
1 | /* A helper tool for perl's 2038 support. |
2 | * See Porting/README.y2038 for details |
3 | */ |
4 | |
1b289682 |
5 | #include <sys/types.h> |
6 | #include <stdio.h> |
7 | #include <time.h> |
8 | #include <errno.h> |
9 | #include <values.h> |
10 | |
11 | int opt_v = 0; |
12 | int i; |
13 | struct tm *tmp; |
14 | time_t pt, pt_max, pt_min; |
15 | |
16 | static char hexbuf[80]; |
17 | char *hex (time_t t) |
18 | { |
19 | if ((long long)t < 0) |
20 | sprintf (hexbuf, " -0x%016lx", -t); |
21 | else |
22 | sprintf (hexbuf, " 0x%016lx", t); |
23 | return (hexbuf); |
24 | } /* hex */ |
25 | |
26 | void gm_check (time_t t, int min_year, int max_year) |
27 | { |
28 | tmp = gmtime (&t); |
29 | if ( tmp == NULL || |
30 | /* Check tm_year overflow */ |
31 | tmp->tm_year < min_year || tmp->tm_year > max_year) { |
32 | if (opt_v) |
33 | fprintf (stderr, "gmtime (%ld) failed with errno %d\n", t, errno); |
34 | } |
35 | else { |
36 | if (opt_v) |
37 | fprintf (stderr, "%3d:%s: %12ld-%02d-%02d %02d:%02d:%02d\n", |
38 | i, hex (t), |
39 | tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday, |
40 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); |
41 | pt = t; |
42 | } |
43 | } /* gm_check */ |
44 | |
45 | int check_gm_max () |
46 | { |
47 | tmp = NULL; |
48 | pt = 0; |
49 | if (tmp == NULL || tmp->tm_year < 0) { |
50 | for (i = 63; i >= 0; i--) { |
51 | time_t x = pt | ((time_t)1 << i); |
52 | if (x < 0 || x < pt) continue; |
53 | gm_check (x, 69, 0x7fffffff); |
54 | } |
55 | } |
56 | pt_max = pt; |
57 | return (0); |
58 | } /* check_gm_max */ |
59 | |
60 | int check_gm_min () |
61 | { |
62 | tmp = NULL; |
63 | pt = 0; |
64 | if (tmp == NULL) { |
65 | for (i = 36; i >= 0; i--) { |
66 | time_t x = pt - ((time_t)1 << i); |
67 | if (x > 0) continue; |
68 | gm_check (x, -1900, 70); |
69 | } |
70 | } |
71 | pt_min = pt; |
72 | return (0); |
73 | } /* check_gm_min */ |
74 | |
75 | void lt_check (time_t t, int min_year, int max_year) |
76 | { |
77 | if (sizeof (time_t) > 4 && t > 0x7ffffffffffff000LL) |
78 | tmp = NULL; |
79 | else |
80 | tmp = localtime (&t); |
81 | if ( tmp == NULL || |
82 | /* Check tm_year overflow */ |
83 | tmp->tm_year < min_year || tmp->tm_year > max_year) { |
84 | if (opt_v) |
85 | fprintf (stderr, "localtime (%ld) failed with errno %d\n", t, errno); |
86 | } |
87 | else { |
88 | if (opt_v) |
89 | fprintf (stderr, "%3d:%s: %12ld-%02d-%02d %02d:%02d:%02d\n", |
90 | i, hex (t), |
91 | tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday, |
92 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); |
93 | pt = t; |
94 | } |
95 | } /* lt_check */ |
96 | |
97 | int check_lt_max () |
98 | { |
99 | tmp = NULL; |
100 | pt = 0; |
101 | if (tmp == NULL || tmp->tm_year < 0) { |
102 | for (i = 63; i >= 0; i--) { |
103 | time_t x = pt | ((time_t)1 << i); |
104 | if (x < 0 || x < pt) continue; |
105 | lt_check (x, 69, 0x7fffffff); |
106 | } |
107 | } |
108 | pt_max = pt; |
109 | return (0); |
110 | } /* check_lt_max */ |
111 | |
112 | int check_lt_min () |
113 | { |
114 | tmp = NULL; |
115 | pt = 0; |
116 | if (tmp == NULL) { |
117 | for (i = 36; i >= 0; i--) { |
118 | time_t x = pt - ((time_t)1 << i); |
119 | if (x > 0) continue; |
120 | lt_check (x, -1900, 70); |
121 | } |
122 | } |
123 | pt_min = pt; |
124 | return (0); |
125 | } /* check_lt_min */ |
126 | |
127 | int main (int argc, char *argv[]) |
128 | { |
129 | time_t gm_max, gm_min, lt_max, lt_min; |
130 | if (argc > 1 && strcmp (argv[1], "-v") == 0) opt_v++; |
131 | |
132 | check_gm_max (); gm_max = pt_max; |
133 | check_gm_min (); gm_min = pt_min; |
134 | check_lt_max (); lt_max = pt_max; |
135 | check_lt_min (); lt_min = pt_min; |
136 | |
137 | opt_v++; |
138 | printf ("======================\n"); |
139 | printf ("Sizeof time_t = %ld\n", (i = sizeof (time_t))); |
140 | printf ("gmtime () boundaries:\n"); |
141 | gm_check (gm_max, 69, 0x7fffffff); |
142 | gm_check (gm_min, -1900, 70); |
143 | printf ("localtime () boundaries:\n"); |
144 | lt_check (lt_max, 69, 0x7fffffff); |
145 | lt_check (lt_min, -1900, 70); |
146 | printf ("Configure variables:\n"); |
147 | printf ("sGMTIME_max='%ld'\n", gm_max); |
148 | printf ("sGMTIME_min='%ld'\n", gm_min); |
149 | printf ("sLOCALTIME_max='%ld'\n", lt_max); |
150 | printf ("sLOCALTIME_min='%ld'\n", lt_min); |
151 | return (0); |
152 | } /* main */ |