util.c

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/*
 *  linux/fs/isofs/util.c
 */

#include <linux/time.h>
#include <linux/iso_fs.h>

/* 
 * We have to convert from a MM/DD/YY format to the Unix ctime format.
 * We have to take into account leap years and all of that good stuff.
 * Unfortunately, the kernel does not have the information on hand to
 * take into account daylight savings time, but it shouldn't matter.
 * The time stored should be localtime (with or without DST in effect),
 * and the timezone offset should hold the offset required to get back
 * to GMT.  Thus  we should always be correct.
 */

int iso_date(char * p, int flag)
{
	int year, month, day, hour, minute, second, tz;
	int crtime, days, i;

	year = p[0] - 70;
	month = p[1];
	day = p[2];
	hour = p[3];
	minute = p[4];
	second = p[5];
	if (flag == 0) tz = p[6]; /* High sierra has no time zone */
	else tz = 0;
	
	if (year < 0) {
		crtime = 0;
	} else {
		int monlen[12] = {31,28,31,30,31,30,31,31,30,31,30,31};

		days = year * 365;
		if (year > 2)
			days += (year+1) / 4;
		for (i = 1; i < month; i++)
			days += monlen[i-1];
		if (((year+2) % 4) == 0 && month > 2)
			days++;
		days += day - 1;
		crtime = ((((days * 24) + hour) * 60 + minute) * 60)
			+ second;

		/* sign extend */
		if (tz & 0x80)
			tz |= (-1 << 8);
		
		/* 
		 * The timezone offset is unreliable on some disks,
		 * so we make a sanity check.  In no case is it ever
		 * more than 13 hours from GMT, which is 52*15min.
		 * The time is always stored in localtime with the
		 * timezone offset being what get added to GMT to
		 * get to localtime.  Thus we need to subtract the offset
		 * to get to true GMT, which is what we store the time
		 * as internally.  On the local system, the user may set
		 * their timezone any way they wish, of course, so GMT
		 * gets converted back to localtime on the receiving
		 * system.
		 *
		 * NOTE: mkisofs in versions prior to mkisofs-1.10 had
		 * the sign wrong on the timezone offset.  This has now
		 * been corrected there too, but if you are getting screwy
		 * results this may be the explanation.  If enough people
		 * complain, a user configuration option could be added
		 * to add the timezone offset in with the wrong sign
		 * for 'compatibility' with older discs, but I cannot see how
		 * it will matter that much.
		 *
		 * Thanks to [e-mail] (Volker Kuhlmann)
		 * for pointing out the sign error.
		 */
		if (-52 <= tz && tz <= 52)
			crtime -= tz * 15 * 60;
	}
	return crtime;
}