80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/* dostime.c - convert dos time to/from time_t.
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Copyright (C) 2002 Free Software Foundation
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <config.h>
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#include <time.h>
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#include "dostime.h"
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/*
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* The specification to which this was written. From Joe Buck.
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* The DOS format appears to have only 2 second resolution. It is an
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* unsigned long, and ORs together
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*
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* (year-1980)<<25
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* month<<21 (month is tm_mon + 1, 1=Jan through 12=Dec)
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* day<<16 (day is tm_mday, 1-31)
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* hour<<11 (hour is tm_hour, 0-23)
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* min<<5 (min is tm_min, 0-59)
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* sec>>1 (sec is tm_sec, 0-59, that's right, we throw away the LSB)
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*
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* DOS uses local time, so the localtime() call is used to turn the time_t
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* into a struct tm.
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*/
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time_t
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dos2unixtime (unsigned long dostime)
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{
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struct tm ltime;
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time_t now = time (NULL);
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/* Call localtime to initialize timezone in TIME. */
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ltime = *localtime (&now);
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ltime.tm_year = (dostime >> 25) + 80;
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ltime.tm_mon = ((dostime >> 21) & 0x0f) - 1;
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ltime.tm_mday = (dostime >> 16) & 0x1f;
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ltime.tm_hour = (dostime >> 11) & 0x0f;
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ltime.tm_min = (dostime >> 5) & 0x3f;
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ltime.tm_sec = (dostime & 0x1f) << 1;
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ltime.tm_wday = -1;
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ltime.tm_yday = -1;
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ltime.tm_isdst = -1;
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return mktime (<ime);
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}
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unsigned long
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unix2dostime (time_t *time)
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{
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struct tm *ltime = localtime (time);
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int year = ltime->tm_year - 80;
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if (year < 0)
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year = 0;
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return (year << 25
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| (ltime->tm_mon + 1) << 21
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| ltime->tm_mday << 16
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| ltime->tm_hour << 11
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| ltime->tm_min << 5
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| ltime->tm_sec >> 1);
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}
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