Commit | Line | Data |
---|---|---|
76797561 DF |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
bbbe213d | 7 | #ifndef lint |
76797561 DF |
8 | static char sccsid[] = "@(#)unctime.c 5.1 (Berkeley) %G%"; |
9 | #endif not lint | |
bbbe213d | 10 | |
6e1fe29b | 11 | #include <sys/types.h> |
56140c8b | 12 | #include <sys/time.h> |
50953c5b | 13 | #include <stdio.h> |
6e1fe29b BJ |
14 | /* |
15 | * Convert a ctime(3) format string into a system format date. | |
16 | * Return the date thus calculated. | |
17 | * | |
18 | * Return -1 if the string is not in ctime format. | |
19 | */ | |
20 | ||
21 | /* | |
22 | * Offsets into the ctime string to various parts. | |
23 | */ | |
24 | ||
25 | #define E_MONTH 4 | |
26 | #define E_DAY 8 | |
27 | #define E_HOUR 11 | |
28 | #define E_MINUTE 14 | |
29 | #define E_SECOND 17 | |
30 | #define E_YEAR 20 | |
31 | ||
32 | time_t unctime(str) | |
33 | char *str; | |
34 | { | |
35 | struct tm then; | |
36 | char dbuf[30]; | |
37 | time_t emitl(); | |
38 | ||
39 | if (strlen(str) != 25) | |
40 | str[25] = 0; | |
41 | strcpy(dbuf, str); | |
42 | dbuf[E_MONTH+3] = 0; | |
50953c5b | 43 | if ( (then.tm_mon = lookup(&dbuf[E_MONTH])) < 0) { |
6e1fe29b | 44 | return(-1);; |
50953c5b | 45 | } |
6e1fe29b BJ |
46 | then.tm_mday = atoi(&dbuf[E_DAY]); |
47 | then.tm_hour = atoi(&dbuf[E_HOUR]); | |
48 | then.tm_min = atoi(&dbuf[E_MINUTE]); | |
49 | then.tm_sec = atoi(&dbuf[E_SECOND]); | |
50 | then.tm_year = atoi(&dbuf[E_YEAR]) - 1900; | |
51 | return(emitl(&then)); | |
52 | } | |
53 | ||
54 | static char months[] = | |
55 | "JanFebMarAprMayJunJulAugSepOctNovDec"; | |
56 | ||
57 | static | |
58 | lookup(str) | |
59 | char *str; | |
60 | { | |
61 | register char *cp, *cp2; | |
62 | ||
63 | for (cp = months, cp2 = str; *cp != 0; cp += 3) | |
64 | if (strncmp(cp, cp2, 3) == 0) | |
65 | return((cp-months) / 3); | |
66 | return(-1); | |
67 | } | |
68 | /* | |
69 | * Routine to convert a localtime(3) format date back into | |
70 | * a system format date. | |
71 | * | |
72 | * Use a binary search. | |
73 | */ | |
74 | ||
75 | struct tm *localtime(); | |
76 | ||
77 | time_t emitl(dp) | |
78 | struct tm *dp; | |
79 | { | |
80 | time_t conv; | |
81 | register int i, bit; | |
82 | struct tm dcopy; | |
83 | ||
84 | dcopy = *dp; | |
85 | dp = &dcopy; | |
86 | conv = 0; | |
50953c5b | 87 | for (i = 30; i >= 0; i--) { |
6e1fe29b BJ |
88 | bit = 1 << i; |
89 | conv |= bit; | |
90 | if (dcmp(localtime(&conv), dp) > 0) | |
91 | conv &= ~bit; | |
92 | } | |
93 | return(conv); | |
94 | } | |
95 | ||
96 | /* | |
97 | * Compare two localtime dates, return result. | |
98 | */ | |
99 | ||
100 | #define DECIDE(a) \ | |
101 | if (dp->a > dp2->a) \ | |
102 | return(1); \ | |
103 | if (dp->a < dp2->a) \ | |
104 | return(-1) | |
105 | ||
106 | static | |
107 | dcmp(dp, dp2) | |
108 | register struct tm *dp, *dp2; | |
109 | { | |
110 | ||
111 | DECIDE(tm_year); | |
112 | DECIDE(tm_mon); | |
113 | DECIDE(tm_mday); | |
114 | DECIDE(tm_hour); | |
115 | DECIDE(tm_min); | |
116 | DECIDE(tm_sec); | |
117 | return(0); | |
118 | } |