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unctime.c revision 1.10 
      1 /*	$NetBSD: unctime.c,v 1.10 1997/04/15 01:09:55 lukem Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1980, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)unctime.c	8.2 (Berkeley) 6/14/94";
     39 #else
     40 static char rcsid[] = "$NetBSD: unctime.c,v 1.10 1997/04/15 01:09:55 lukem Exp $";
     41 #endif
     42 #endif /* not lint */
     43 
     44 #include <sys/types.h>
     45 
     46 #include <stdio.h>
     47 #include <time.h>
     48 #ifdef __STDC__
     49 #include <stdlib.h>
     50 #include <string.h>
     51 #endif
     52 
     53 #ifndef __P
     54 #include <sys/cdefs.h>
     55 #endif
     56 
     57 /*
     58  * Convert a ctime(3) format string into a system format date.
     59  * Return the date thus calculated.
     60  *
     61  * Return -1 if the string is not in ctime format.
     62  */
     63 
     64 /*
     65  * Offsets into the ctime string to various parts.
     66  */
     67 
     68 #define	E_MONTH		4
     69 #define	E_DAY		8
     70 #define	E_HOUR		11
     71 #define	E_MINUTE	14
     72 #define	E_SECOND	17
     73 #define	E_YEAR		20
     74 
     75 static	int lookup __P((char *));
     76 
     77 
     78 time_t
     79 unctime(str)
     80 	char *str;
     81 {
     82 	struct tm then;
     83 	char dbuf[26];
     84 
     85 	(void) strncpy(dbuf, str, sizeof(dbuf) - 1);
     86 	dbuf[sizeof(dbuf) - 1] = '\0';
     87 	dbuf[E_MONTH+3] = '\0';
     88 	if ((then.tm_mon = lookup(&dbuf[E_MONTH])) < 0)
     89 		return (-1);
     90 	then.tm_mday = atoi(&dbuf[E_DAY]);
     91 	then.tm_hour = atoi(&dbuf[E_HOUR]);
     92 	then.tm_min = atoi(&dbuf[E_MINUTE]);
     93 	then.tm_sec = atoi(&dbuf[E_SECOND]);
     94 	then.tm_year = atoi(&dbuf[E_YEAR]) - 1900;
     95 	then.tm_isdst = -1;
     96 	return(mktime(&then));
     97 }
     98 
     99 static char months[] =
    100 	"JanFebMarAprMayJunJulAugSepOctNovDec";
    101 
    102 static int
    103 lookup(str)
    104 	char *str;
    105 {
    106 	char *cp, *cp2;
    107 
    108 	for (cp = months, cp2 = str; *cp != '\0'; cp += 3)
    109 		if (strncmp(cp, cp2, 3) == 0)
    110 			return((cp-months) / 3);
    111 	return(-1);
    112 }
    113