* gcc.dg/vect/pr24225.c: Add cleanup-coverage-files.
[official-gcc.git] / fastjar / dostime.c
blob10c0bf32a9a70cdb189fdcca83bea2da63aff1ee
1 /* dostime.c - convert dos time to/from time_t.
3 Copyright (C) 2002 Free Software Foundation
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License
7 as published by the Free Software Foundation; either version 2
8 of the License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 #include <config.h>
22 #include <time.h>
24 #include <stddef.h>
26 #include "dostime.h"
29 * The specification to which this was written. From Joe Buck.
30 * The DOS format appears to have only 2 second resolution. It is an
31 * unsigned long, and ORs together
33 * (year-1980)<<25
34 * month<<21 (month is tm_mon + 1, 1=Jan through 12=Dec)
35 * day<<16 (day is tm_mday, 1-31)
36 * hour<<11 (hour is tm_hour, 0-23)
37 * min<<5 (min is tm_min, 0-59)
38 * sec>>1 (sec is tm_sec, 0-59, that's right, we throw away the LSB)
40 * DOS uses local time, so the localtime() call is used to turn the time_t
41 * into a struct tm.
44 time_t
45 dos2unixtime (unsigned long dostime)
47 struct tm ltime;
48 time_t now = time (NULL);
50 /* Call localtime to initialize timezone in TIME. */
51 ltime = *localtime (&now);
53 ltime.tm_year = (dostime >> 25) + 80;
54 ltime.tm_mon = ((dostime >> 21) & 0x0f) - 1;
55 ltime.tm_mday = (dostime >> 16) & 0x1f;
56 ltime.tm_hour = (dostime >> 11) & 0x0f;
57 ltime.tm_min = (dostime >> 5) & 0x3f;
58 ltime.tm_sec = (dostime & 0x1f) << 1;
60 ltime.tm_wday = -1;
61 ltime.tm_yday = -1;
62 ltime.tm_isdst = -1;
64 return mktime (&ltime);
67 unsigned long
68 unix2dostime (time_t *time)
70 struct tm *ltime = localtime (time);
71 int year = ltime->tm_year - 80;
72 if (year < 0)
73 year = 0;
75 return (year << 25
76 | (ltime->tm_mon + 1) << 21
77 | ltime->tm_mday << 16
78 | ltime->tm_hour << 11
79 | ltime->tm_min << 5
80 | ltime->tm_sec >> 1);