LCOV - code coverage report
Current view: top level - lkbce/fs/isofs - util.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 28 28 100.0 %
Date: 2017-01-25 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  *  linux/fs/isofs/util.c
       3             :  */
       4             : 
       5             : #include "isofs.h"
       6             : 
       7             : /* 
       8             :  * We have to convert from a MM/DD/YY format to the Unix ctime format.
       9             :  * We have to take into account leap years and all of that good stuff.
      10             :  * Unfortunately, the kernel does not have the information on hand to
      11             :  * take into account daylight savings time, but it shouldn't matter.
      12             :  * The time stored should be localtime (with or without DST in effect),
      13             :  * and the timezone offset should hold the offset required to get back
      14             :  * to GMT.  Thus  we should always be correct.
      15             :  */
      16             : 
      17             : int iso_date(char * p, int flag)
      18             : {
      19         176 :         int year, month, day, hour, minute, second, tz;
      20         176 :         int crtime, days, i;
      21         176 : 
      22         352 :         year = p[0] - 70;
      23         352 :         month = p[1];
      24         352 :         day = p[2];
      25         352 :         hour = p[3];
      26         352 :         minute = p[4];
      27         352 :         second = p[5];
      28         704 :         if (flag == 0) tz = p[6]; /* High sierra has no time zone */
      29         352 :         else tz = 0;
      30             :         
      31         352 :         if (year < 0) {
      32         176 :                 crtime = 0;
      33             :         } else {
      34        2112 :                 int monlen[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
      35             : 
      36         176 :                 days = year * 365;
      37         352 :                 if (year > 2)
      38         176 :                         days += (year+1) / 4;
      39         880 :                 for (i = 1; i < month; i++)
      40         528 :                         days += monlen[i-1];
      41         880 :                 if (((year+2) % 4) == 0 && month > 2)
      42         176 :                         days++;
      43         176 :                 days += day - 1;
      44         176 :                 crtime = ((((days * 24) + hour) * 60 + minute) * 60)
      45             :                         + second;
      46             : 
      47             :                 /* sign extend */
      48         352 :                 if (tz & 0x80)
      49         176 :                         tz |= (-1 << 8);
      50             :                 
      51             :                 /* 
      52             :                  * The timezone offset is unreliable on some disks,
      53             :                  * so we make a sanity check.  In no case is it ever
      54             :                  * more than 13 hours from GMT, which is 52*15min.
      55             :                  * The time is always stored in localtime with the
      56             :                  * timezone offset being what get added to GMT to
      57             :                  * get to localtime.  Thus we need to subtract the offset
      58             :                  * to get to true GMT, which is what we store the time
      59             :                  * as internally.  On the local system, the user may set
      60             :                  * their timezone any way they wish, of course, so GMT
      61             :                  * gets converted back to localtime on the receiving
      62             :                  * system.
      63             :                  *
      64             :                  * NOTE: mkisofs in versions prior to mkisofs-1.10 had
      65             :                  * the sign wrong on the timezone offset.  This has now
      66             :                  * been corrected there too, but if you are getting screwy
      67             :                  * results this may be the explanation.  If enough people
      68             :                  * complain, a user configuration option could be added
      69             :                  * to add the timezone offset in with the wrong sign
      70             :                  * for 'compatibility' with older discs, but I cannot see how
      71             :                  * it will matter that much.
      72             :                  *
      73             :                  * Thanks to kuhlmav@elec.canterbury.ac.nz (Volker Kuhlmann)
      74             :                  * for pointing out the sign error.
      75             :                  */
      76         352 :                 if (-52 <= tz && tz <= 52)
      77         176 :                         crtime -= tz * 15 * 60;
      78             :         }
      79         352 :         return crtime;
      80             : }               

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