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unctime.c revision 1.7 
      1 /*-
      2  * Copyright (c) 1980, 1993
      3  *	The Regents of the University of California.  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[] = "from: @(#)unctime.c	8.1 (Berkeley) 6/5/93";*/
     36 static char *rcsid = "$Id: unctime.c,v 1.7 1994/06/08 18:57:43 mycroft Exp $";
     37 #endif /* not lint */
     38 
     39 #include <sys/types.h>
     40 
     41 #include <stdio.h>
     42 #include <time.h>
     43 #ifdef __STDC__
     44 #include <stdlib.h>
     45 #include <string.h>
     46 #endif
     47 
     48 #ifndef __P
     49 #include <sys/cdefs.h>
     50 #endif
     51 
     52 /*
     53  * Convert a ctime(3) format string into a system format date.
     54  * Return the date thus calculated.
     55  *
     56  * Return -1 if the string is not in ctime format.
     57  */
     58 
     59 /*
     60  * Offsets into the ctime string to various parts.
     61  */
     62 
     63 #define	E_MONTH		4
     64 #define	E_DAY		8
     65 #define	E_HOUR		11
     66 #define	E_MINUTE	14
     67 #define	E_SECOND	17
     68 #define	E_YEAR		20
     69 
     70 static	int lookup __P((char *));
     71 
     72 
     73 time_t
     74 unctime(str)
     75 	char *str;
     76 {
     77 	struct tm then;
     78 	char dbuf[26];
     79 
     80 	(void) strncpy(dbuf, str, sizeof(dbuf) - 1);
     81 	dbuf[sizeof(dbuf) - 1] = '\0';
     82 	dbuf[E_MONTH+3] = '\0';
     83 	if ((then.tm_mon = lookup(&dbuf[E_MONTH])) < 0)
     84 		return (-1);
     85 	then.tm_mday = atoi(&dbuf[E_DAY]);
     86 	then.tm_hour = atoi(&dbuf[E_HOUR]);
     87 	then.tm_min = atoi(&dbuf[E_MINUTE]);
     88 	then.tm_sec = atoi(&dbuf[E_SECOND]);
     89 	then.tm_year = atoi(&dbuf[E_YEAR]) - 1900;
     90 	then.tm_isdst = -1;
     91 	return(mktime(&then));
     92 }
     93 
     94 static char months[] =
     95 	"JanFebMarAprMayJunJulAugSepOctNovDec";
     96 
     97 static int
     98 lookup(str)
     99 	char *str;
    100 {
    101 	register char *cp, *cp2;
    102 
    103 	for (cp = months, cp2 = str; *cp != '\0'; cp += 3)
    104 		if (strncmp(cp, cp2, 3) == 0)
    105 			return((cp-months) / 3);
    106 	return(-1);
    107 }
    108