158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
/*-
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)unctime.c 8.1 (Berkeley) 6/5/93";
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#endif /* not lint */
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#include <sys/types.h>
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#include <stdio.h>
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#include <time.h>
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#ifdef __STDC__
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#include <stdlib.h>
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#include <string.h>
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#endif
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#ifndef __P
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#include <sys/cdefs.h>
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#endif
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/*
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* Convert a ctime(3) format string into a system format date.
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* Return the date thus calculated.
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*
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* Return -1 if the string is not in ctime format.
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*/
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/*
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* Offsets into the ctime string to various parts.
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*/
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#define E_MONTH 4
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#define E_DAY 8
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#define E_HOUR 11
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#define E_MINUTE 14
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#define E_SECOND 17
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#define E_YEAR 20
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static int dcmp __P((struct tm *, struct tm *));
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static time_t emitl __P((struct tm *));
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static int lookup __P((char *));
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time_t
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unctime(str)
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char *str;
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{
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struct tm then;
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char dbuf[26];
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(void) strncpy(dbuf, str, sizeof(dbuf) - 1);
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dbuf[sizeof(dbuf) - 1] = '\0';
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dbuf[E_MONTH+3] = '\0';
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if ((then.tm_mon = lookup(&dbuf[E_MONTH])) < 0)
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return (-1);
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then.tm_mday = atoi(&dbuf[E_DAY]);
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then.tm_hour = atoi(&dbuf[E_HOUR]);
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then.tm_min = atoi(&dbuf[E_MINUTE]);
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then.tm_sec = atoi(&dbuf[E_SECOND]);
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then.tm_year = atoi(&dbuf[E_YEAR]) - 1900;
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return(emitl(&then));
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}
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static char months[] =
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"JanFebMarAprMayJunJulAugSepOctNovDec";
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static int
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lookup(str)
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char *str;
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{
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register char *cp, *cp2;
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for (cp = months, cp2 = str; *cp != '\0'; cp += 3)
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if (strncmp(cp, cp2, 3) == 0)
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return((cp-months) / 3);
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return(-1);
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}
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/*
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* Routine to convert a localtime(3) format date back into
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* a system format date.
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*
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* Use a binary search.
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*/
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static time_t
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emitl(dp)
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struct tm *dp;
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{
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time_t conv;
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register int i, bit;
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struct tm dcopy;
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dcopy = *dp;
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dp = &dcopy;
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conv = 0;
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for (i = 30; i >= 0; i--) {
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bit = 1 << i;
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conv |= bit;
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if (dcmp(localtime(&conv), dp) > 0)
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conv &= ~bit;
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}
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return(conv);
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}
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/*
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* Compare two localtime dates, return result.
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*/
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#define DECIDE(a) \
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if (dp->a > dp2->a) \
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return(1); \
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if (dp->a < dp2->a) \
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return(-1)
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static int
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dcmp(dp, dp2)
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register struct tm *dp, *dp2;
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{
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DECIDE(tm_year);
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DECIDE(tm_mon);
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DECIDE(tm_mday);
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DECIDE(tm_hour);
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DECIDE(tm_min);
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DECIDE(tm_sec);
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return(0);
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}
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