-/*
- dostime.c - routines for converting UNIX time to MS-DOS time.
-
- Borrowed from Info-zip's unzip
+/* dostime.c - convert dos time to/from time_t.
- Copyright (C) 1999 Bryan Burns
+ 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.
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
-/* $Id: dostime.c,v 1.1.1.1 1999/12/06 03:09:12 toast Exp $
-
- $Log: dostime.c,v $
- Revision 1.1.1.1 1999/12/06 03:09:12 toast
- initial checkin..
-
-
-
- Revision 1.6 1999/05/10 08:32:26 burnsbr
- added dos2unixtime
-
- Revision 1.5 1999/04/27 10:03:50 burnsbr
- configure support
-
- Revision 1.4 1999/04/26 21:55:19 burnsbr
- switched from sys/time.h to time.h for better portability
-
- Revision 1.3 1999/04/20 08:54:30 burnsbr
- added GPL comment
-
- Revision 1.2 1999/04/20 05:10:53 burnsbr
- added RCS tags
-
-
-*/
-#include "config.h"
+#include <config.h>
-#ifdef TM_IN_SYS_TIME
-#include <sys/time.h>
-#else
#include <time.h>
-#endif
-#include "dostime.h"
+#include <stddef.h>
-static char rcsid[] = "$Id: dostime.c,v 1.1.1.1 1999/12/06 03:09:12 toast Exp $";
+#include "dostime.h"
/*
-
- Copyright (C) 1990-1997 Mark Adler, Richard B. Wales, Jean-loup Gailly,
- Kai Uwe Rommel, Onno van der Linden and Igor Mandrichenko.
- Permission is granted to any individual or institution to use, copy, or
- redistribute this software so long as all of the original files are included,
- that it is not sold for profit, and that this copyright notice is retained.
-
-*/
-
-
-time_t dos2unixtime(dostime)
- unsigned long dostime; /* DOS time to convert */
- /* Return the Unix time_t value (GMT/UTC time) for the DOS format (local)
- * time dostime, where dostime is a four byte value (date in most
- * significant word, time in least significant word), see dostime()
- * function.
- */
+ * 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 *t; /* argument for mktime() */
- time_t clock = time(NULL);
+ struct tm ltime;
+ time_t now = time (NULL);
- t = localtime(&clock);
- t->tm_isdst = -1; /* let mktime() determine if DST is in effect */
- /* Convert DOS time to UNIX time_t format */
- t->tm_sec = (((int)dostime) << 1) & 0x3e;
- t->tm_min = (((int)dostime) >> 5) & 0x3f;
- t->tm_hour = (((int)dostime) >> 11) & 0x1f;
- t->tm_mday = (int)(dostime >> 16) & 0x1f;
- t->tm_mon = ((int)(dostime >> 21) & 0x0f) - 1;
- t->tm_year = ((int)(dostime >> 25) & 0x7f) + 80;
+ /* Call localtime to initialize timezone in TIME. */
+ ltime = *localtime (&now);
- return mktime(t);
-}
+ 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;
-unsigned long dostime(y, n, d, h, m, s)
-int y; /* year */
-int n; /* month */
-int d; /* day */
-int h; /* hour */
-int m; /* minute */
-int s; /* second */
-/* Convert the date y/n/d and time h:m:s to a four byte DOS date and
- time (date in high two bytes, time in low two bytes allowing magnitude
- comparison). */
-{
- return y < 1980 ? dostime(1980, 1, 1, 0, 0, 0) :
- (((unsigned long)y - 1980) << 25) | ((unsigned long)n << 21) |
- ((unsigned long)d << 16) | ((unsigned long)h << 11) |
- ((unsigned long)m << 5) | ((unsigned long)s >> 1);
-}
+ ltime.tm_wday = -1;
+ ltime.tm_yday = -1;
+ ltime.tm_isdst = -1;
+ return mktime (<ime);
+}
-unsigned long unix2dostime(t)
-time_t *t; /* unix time to convert */
-/* Return the Unix time t in DOS format, rounded up to the next two
- second boundary. */
+unsigned long
+unix2dostime (time_t *time)
{
- time_t t_even;
- struct tm *s; /* result of localtime() */
-
- t_even = (*t + 1) & (~1); /* Round up to even seconds. */
- s = localtime(&t_even); /* Use local time since MSDOS does. */
- return dostime(s->tm_year + 1900, s->tm_mon + 1, s->tm_mday,
- s->tm_hour, s->tm_min, s->tm_sec);
+ 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);
}
-
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