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15637ed4 RG |
1 | /*- |
2 | * Copyright (c) 1980 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | static char sccsid[] = "@(#)unctime.c 5.4 (Berkeley) 3/7/91"; | |
b16a1b0e | 36 | static char rcsid[] = "$Header: /b/source/CVS/src/sbin/dump/unctime.c,v 1.3 1993/03/23 00:27:23 cgd Exp $"; |
15637ed4 RG |
37 | #endif /* not lint */ |
38 | ||
39 | #include <sys/types.h> | |
40 | #include <time.h> | |
41 | #include <stdio.h> | |
42 | #ifdef __STDC__ | |
43 | #include <stdlib.h> | |
44 | #include <string.h> | |
45 | #endif | |
46 | ||
47 | /* | |
48 | * Convert a ctime(3) format string into a system format date. | |
49 | * Return the date thus calculated. | |
50 | * | |
51 | * Return -1 if the string is not in ctime format. | |
52 | */ | |
53 | ||
54 | /* | |
55 | * Offsets into the ctime string to various parts. | |
56 | */ | |
57 | ||
58 | #define E_MONTH 4 | |
59 | #define E_DAY 8 | |
60 | #define E_HOUR 11 | |
61 | #define E_MINUTE 14 | |
62 | #define E_SECOND 17 | |
63 | #define E_YEAR 20 | |
64 | ||
65 | static int lookup(); | |
66 | ||
67 | time_t | |
68 | unctime(str) | |
69 | char *str; | |
70 | { | |
71 | struct tm then; | |
72 | char dbuf[30]; | |
73 | time_t emitl(); | |
74 | ||
75 | if (strlen(str) != 25) | |
76 | str[25] = 0; | |
77 | strcpy(dbuf, str); | |
78 | dbuf[E_MONTH+3] = 0; | |
79 | if ((then.tm_mon = lookup(&dbuf[E_MONTH])) < 0) | |
80 | return (-1); | |
81 | then.tm_mday = atoi(&dbuf[E_DAY]); | |
82 | then.tm_hour = atoi(&dbuf[E_HOUR]); | |
83 | then.tm_min = atoi(&dbuf[E_MINUTE]); | |
84 | then.tm_sec = atoi(&dbuf[E_SECOND]); | |
85 | then.tm_year = atoi(&dbuf[E_YEAR]) - 1900; | |
86 | return(emitl(&then)); | |
87 | } | |
88 | ||
89 | static char months[] = | |
90 | "JanFebMarAprMayJunJulAugSepOctNovDec"; | |
91 | ||
92 | static int | |
93 | lookup(str) | |
94 | char *str; | |
95 | { | |
96 | register char *cp, *cp2; | |
97 | ||
98 | for (cp = months, cp2 = str; *cp != 0; cp += 3) | |
99 | if (strncmp(cp, cp2, 3) == 0) | |
100 | return((cp-months) / 3); | |
101 | return(-1); | |
102 | } | |
103 | /* | |
104 | * Routine to convert a localtime(3) format date back into | |
105 | * a system format date. | |
106 | * | |
107 | * Use a binary search. | |
108 | */ | |
109 | ||
110 | struct tm *localtime(); | |
111 | static int dcmp(); | |
112 | ||
113 | time_t | |
114 | emitl(dp) | |
115 | struct tm *dp; | |
116 | { | |
117 | time_t conv; | |
118 | register int i, bit; | |
119 | struct tm dcopy; | |
120 | ||
121 | dcopy = *dp; | |
122 | dp = &dcopy; | |
123 | conv = 0; | |
124 | for (i = 30; i >= 0; i--) { | |
125 | bit = 1 << i; | |
126 | conv |= bit; | |
127 | if (dcmp(localtime(&conv), dp) > 0) | |
128 | conv &= ~bit; | |
129 | } | |
130 | return(conv); | |
131 | } | |
132 | ||
133 | /* | |
134 | * Compare two localtime dates, return result. | |
135 | */ | |
136 | ||
137 | #define DECIDE(a) \ | |
138 | if (dp->a > dp2->a) \ | |
139 | return(1); \ | |
140 | if (dp->a < dp2->a) \ | |
141 | return(-1) | |
142 | ||
143 | static int | |
144 | dcmp(dp, dp2) | |
145 | register struct tm *dp, *dp2; | |
146 | { | |
147 | ||
148 | DECIDE(tm_year); | |
149 | DECIDE(tm_mon); | |
150 | DECIDE(tm_mday); | |
151 | DECIDE(tm_hour); | |
152 | DECIDE(tm_min); | |
153 | DECIDE(tm_sec); | |
154 | return(0); | |
155 | } |