The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/udf/udftime.c

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    1 /* Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
    2    This file is part of the GNU C Library.
    3    Contributed by Paul Eggert (eggert@twinsun.com).
    4 
    5    The GNU C Library is free software; you can redistribute it and/or
    6    modify it under the terms of the GNU Library General Public License as
    7    published by the Free Software Foundation; either version 2 of the
    8    License, or (at your option) any later version.
    9 
   10    The GNU C Library 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 GNU
   13    Library General Public License for more details.
   14 
   15    You should have received a copy of the GNU Library General Public
   16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
   17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   18    Boston, MA 02111-1307, USA.  */
   19 
   20 /*
   21  * dgb 10/02/98: ripped this from glibc source to help convert timestamps
   22  *               to unix time
   23  *     10/04/98: added new table-based lookup after seeing how ugly
   24  *               the gnu code is
   25  * blf 09/27/99: ripped out all the old code and inserted new table from
   26  *               John Brockmeyer (without leap second corrections)
   27  *               rewrote udf_stamp_to_time and fixed timezone accounting in
   28  *               udf_time_to_stamp.
   29  */
   30 
   31 /*
   32  * We don't take into account leap seconds. This may be correct or incorrect.
   33  * For more NIST information (especially dealing with leap seconds), see:
   34  * http://www.boulder.nist.gov/timefreq/pubs/bulletin/leapsecond.htm
   35  */
   36 
   37 #include "udfdecl.h"
   38 
   39 #include <linux/types.h>
   40 #include <linux/kernel.h>
   41 
   42 #define EPOCH_YEAR 1970
   43 
   44 #ifndef __isleap
   45 /* Nonzero if YEAR is a leap year (every 4 years,
   46    except every 100th isn't, and every 400th is).  */
   47 #define __isleap(year)  \
   48   ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
   49 #endif
   50 
   51 /* How many days come before each month (0-12).  */
   52 static const unsigned short int __mon_yday[2][13] = {
   53         /* Normal years.  */
   54         {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
   55         /* Leap years.  */
   56         {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
   57 };
   58 
   59 #define MAX_YEAR_SECONDS        69
   60 #define SPD                     0x15180 /*3600*24 */
   61 #define SPY(y, l, s)            (SPD * (365 * y + l) + s)
   62 
   63 static time_t year_seconds[MAX_YEAR_SECONDS] = {
   64 /*1970*/ SPY(0,   0, 0), SPY(1,   0, 0), SPY(2,   0, 0), SPY(3,   1, 0),
   65 /*1974*/ SPY(4,   1, 0), SPY(5,   1, 0), SPY(6,   1, 0), SPY(7,   2, 0),
   66 /*1978*/ SPY(8,   2, 0), SPY(9,   2, 0), SPY(10,  2, 0), SPY(11,  3, 0),
   67 /*1982*/ SPY(12,  3, 0), SPY(13,  3, 0), SPY(14,  3, 0), SPY(15,  4, 0),
   68 /*1986*/ SPY(16,  4, 0), SPY(17,  4, 0), SPY(18,  4, 0), SPY(19,  5, 0),
   69 /*1990*/ SPY(20,  5, 0), SPY(21,  5, 0), SPY(22,  5, 0), SPY(23,  6, 0),
   70 /*1994*/ SPY(24,  6, 0), SPY(25,  6, 0), SPY(26,  6, 0), SPY(27,  7, 0),
   71 /*1998*/ SPY(28,  7, 0), SPY(29,  7, 0), SPY(30,  7, 0), SPY(31,  8, 0),
   72 /*2002*/ SPY(32,  8, 0), SPY(33,  8, 0), SPY(34,  8, 0), SPY(35,  9, 0),
   73 /*2006*/ SPY(36,  9, 0), SPY(37,  9, 0), SPY(38,  9, 0), SPY(39, 10, 0),
   74 /*2010*/ SPY(40, 10, 0), SPY(41, 10, 0), SPY(42, 10, 0), SPY(43, 11, 0),
   75 /*2014*/ SPY(44, 11, 0), SPY(45, 11, 0), SPY(46, 11, 0), SPY(47, 12, 0),
   76 /*2018*/ SPY(48, 12, 0), SPY(49, 12, 0), SPY(50, 12, 0), SPY(51, 13, 0),
   77 /*2022*/ SPY(52, 13, 0), SPY(53, 13, 0), SPY(54, 13, 0), SPY(55, 14, 0),
   78 /*2026*/ SPY(56, 14, 0), SPY(57, 14, 0), SPY(58, 14, 0), SPY(59, 15, 0),
   79 /*2030*/ SPY(60, 15, 0), SPY(61, 15, 0), SPY(62, 15, 0), SPY(63, 16, 0),
   80 /*2034*/ SPY(64, 16, 0), SPY(65, 16, 0), SPY(66, 16, 0), SPY(67, 17, 0),
   81 /*2038*/ SPY(68, 17, 0)
   82 };
   83 
   84 extern struct timezone sys_tz;
   85 
   86 #define SECS_PER_HOUR   (60 * 60)
   87 #define SECS_PER_DAY    (SECS_PER_HOUR * 24)
   88 
   89 struct timespec *
   90 udf_disk_stamp_to_time(struct timespec *dest, struct timestamp src)
   91 {
   92         int yday;
   93         u16 typeAndTimezone = le16_to_cpu(src.typeAndTimezone);
   94         u16 year = le16_to_cpu(src.year);
   95         uint8_t type = typeAndTimezone >> 12;
   96         int16_t offset;
   97 
   98         if (type == 1) {
   99                 offset = typeAndTimezone << 4;
  100                 /* sign extent offset */
  101                 offset = (offset >> 4);
  102                 if (offset == -2047) /* unspecified offset */
  103                         offset = 0;
  104         } else
  105                 offset = 0;
  106 
  107         if ((year < EPOCH_YEAR) ||
  108             (year >= EPOCH_YEAR + MAX_YEAR_SECONDS)) {
  109                 return NULL;
  110         }
  111         dest->tv_sec = year_seconds[year - EPOCH_YEAR];
  112         dest->tv_sec -= offset * 60;
  113 
  114         yday = ((__mon_yday[__isleap(year)][src.month - 1]) + src.day - 1);
  115         dest->tv_sec += (((yday * 24) + src.hour) * 60 + src.minute) * 60 + src.second;
  116         dest->tv_nsec = 1000 * (src.centiseconds * 10000 +
  117                         src.hundredsOfMicroseconds * 100 + src.microseconds);
  118         return dest;
  119 }
  120 
  121 struct timestamp *
  122 udf_time_to_disk_stamp(struct timestamp *dest, struct timespec ts)
  123 {
  124         long int days, rem, y;
  125         const unsigned short int *ip;
  126         int16_t offset;
  127 
  128         offset = -sys_tz.tz_minuteswest;
  129 
  130         if (!dest)
  131                 return NULL;
  132 
  133         dest->typeAndTimezone = cpu_to_le16(0x1000 | (offset & 0x0FFF));
  134 
  135         ts.tv_sec += offset * 60;
  136         days = ts.tv_sec / SECS_PER_DAY;
  137         rem = ts.tv_sec % SECS_PER_DAY;
  138         dest->hour = rem / SECS_PER_HOUR;
  139         rem %= SECS_PER_HOUR;
  140         dest->minute = rem / 60;
  141         dest->second = rem % 60;
  142         y = 1970;
  143 
  144 #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
  145 #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
  146 
  147         while (days < 0 || days >= (__isleap(y) ? 366 : 365)) {
  148                 long int yg = y + days / 365 - (days % 365 < 0);
  149 
  150                 /* Adjust DAYS and Y to match the guessed year.  */
  151                 days -= ((yg - y) * 365
  152                          + LEAPS_THRU_END_OF(yg - 1)
  153                          - LEAPS_THRU_END_OF(y - 1));
  154                 y = yg;
  155         }
  156         dest->year = cpu_to_le16(y);
  157         ip = __mon_yday[__isleap(y)];
  158         for (y = 11; days < (long int)ip[y]; --y)
  159                 continue;
  160         days -= ip[y];
  161         dest->month = y + 1;
  162         dest->day = days + 1;
  163 
  164         dest->centiseconds = ts.tv_nsec / 10000000;
  165         dest->hundredsOfMicroseconds = (ts.tv_nsec / 1000 -
  166                                         dest->centiseconds * 10000) / 100;
  167         dest->microseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000 -
  168                               dest->hundredsOfMicroseconds * 100);
  169         return dest;
  170 }
  171 
  172 /* EOF */

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