85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
// SPDX-License-Identifier: LGPL-2.0+
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/* Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Paul Eggert (eggert@twinsun.com). */
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/*
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* dgb 10/02/98: ripped this from glibc source to help convert timestamps
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* to unix time
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* 10/04/98: added new table-based lookup after seeing how ugly
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* the gnu code is
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* blf 09/27/99: ripped out all the old code and inserted new table from
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* John Brockmeyer (without leap second corrections)
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* rewrote udf_stamp_to_time and fixed timezone accounting in
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* udf_time_to_stamp.
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*/
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/*
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* We don't take into account leap seconds. This may be correct or incorrect.
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* For more NIST information (especially dealing with leap seconds), see:
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* http://www.boulder.nist.gov/timefreq/pubs/bulletin/leapsecond.htm
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*/
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#include "udfdecl.h"
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/time.h>
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void
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udf_disk_stamp_to_time(struct timespec64 *dest, struct timestamp src)
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{
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u16 typeAndTimezone = le16_to_cpu(src.typeAndTimezone);
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u16 year = le16_to_cpu(src.year);
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uint8_t type = typeAndTimezone >> 12;
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int16_t offset;
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if (type == 1) {
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offset = typeAndTimezone << 4;
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/* sign extent offset */
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offset = (offset >> 4);
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if (offset == -2047) /* unspecified offset */
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offset = 0;
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} else
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offset = 0;
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dest->tv_sec = mktime64(year, src.month, src.day, src.hour, src.minute,
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src.second);
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dest->tv_sec -= offset * 60;
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dest->tv_nsec = 1000 * (src.centiseconds * 10000 +
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src.hundredsOfMicroseconds * 100 + src.microseconds);
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/*
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* Sanitize nanosecond field since reportedly some filesystems are
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* recorded with bogus sub-second values.
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*/
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dest->tv_nsec %= NSEC_PER_SEC;
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}
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void
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udf_time_to_disk_stamp(struct timestamp *dest, struct timespec64 ts)
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{
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time64_t seconds;
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int16_t offset;
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struct tm tm;
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offset = -sys_tz.tz_minuteswest;
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dest->typeAndTimezone = cpu_to_le16(0x1000 | (offset & 0x0FFF));
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seconds = ts.tv_sec + offset * 60;
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time64_to_tm(seconds, 0, &tm);
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dest->year = cpu_to_le16(tm.tm_year + 1900);
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dest->month = tm.tm_mon + 1;
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dest->day = tm.tm_mday;
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dest->hour = tm.tm_hour;
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dest->minute = tm.tm_min;
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dest->second = tm.tm_sec;
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dest->centiseconds = ts.tv_nsec / 10000000;
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dest->hundredsOfMicroseconds = (ts.tv_nsec / 1000 -
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dest->centiseconds * 10000) / 100;
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dest->microseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000 -
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dest->hundredsOfMicroseconds * 100);
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}
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/* EOF */
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