119 lines
2.1 KiB
C
119 lines
2.1 KiB
C
#ident "$Revision: 1.4 $"
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/*
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* Copyright (c) 1980 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*
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* static char sccsid[] = "@(#)unctime.c 5.1 (Berkeley) 6/5/85";
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static int dcmp(struct tm *, struct tm *);
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static time_t emitl(struct tm *);
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static int lookup(char *);
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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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time_t
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unctime(char *str)
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{
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struct tm then;
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char dbuf[30];
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if (strlen(str) != 25)
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str[25] = 0;
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strcpy(dbuf, str);
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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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}
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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(char *str)
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{
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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(struct tm *dp)
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{
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time_t conv;
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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(struct tm *dp, struct tm *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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