unctime.c revision 1.6 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 /* from: static char sccsid[] = "@(#)unctime.c 5.5 (Berkeley) 6/18/92"; */
36 static char *rcsid = "$Id: unctime.c,v 1.6 1993/12/24 01:16:59 jtc Exp $";
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
74 if (strlen(str) != 25)
75 str[25] = 0;
76 (void) strcpy(dbuf, str);
77 dbuf[E_MONTH+3] = 0;
78 if ((then.tm_mon = lookup(&dbuf[E_MONTH])) < 0)
79 return (-1);
80 then.tm_mday = atoi(&dbuf[E_DAY]);
81 then.tm_hour = atoi(&dbuf[E_HOUR]);
82 then.tm_min = atoi(&dbuf[E_MINUTE]);
83 then.tm_sec = atoi(&dbuf[E_SECOND]);
84 then.tm_year = atoi(&dbuf[E_YEAR]) - 1900;
85 then.tm_isdst = -1;
86 return(mktime(&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