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