Commit | Line | Data |
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233e9d1c JV |
1 | /* A helper tool for perl's 2038 support. |
2 | * See Porting/README.y2038 for details | |
3 | */ | |
4 | ||
1b289682 MB |
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 */ |