Re: Instant Track

From: Rob Janssen (lzamywe@imcinternet.net)
Date: Sat Jan 01 2000 - 15:30:56 EET

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    Hamish Moffatt <pvfuhqky.hvjoour@memphis.edu> wrote:
    >Carl R. Stevenson <ndrw@roskapostia.tunk.net> wrote:
    >> If anyone has experience-based recomendations on either Win32
    >> or Linux sat trcking programs, I'd appreciate a comment and a URL
    >> to the download site.

    >There's a few on linux. SatTrack is reasonable; the newer versions
    >are commercial but the 3.x version is free for amateur use. Unfortunately
    >it appears to be non-Y2K compliant, having tried to use it this morning.
    >The source is available so I might try to fix it later.

    Here is the only bug I found sofar. It seems to try hard at Y2K
    compatability (essentially using the range 1950-2049) but there is
    a routine that calcs the daynumber and starts from a vaguely-defined
    year number (sometimes a 4-digit, sometimes a 2-digit value).

    This patch makes it run again today. I hope (and believe) it also
    works when year-00 keps are loaded.

    Rob

    diff -cr SatTrack-orig/src/sattrack/sattime.c SatTrack/src/sattrack/sattime.c
    *** SatTrack-pe1chl/src/sattrack/sattime.c Sat Jan 4 22:19:08 1997
    --- SatTrack/src/sattrack/sattime.c Sat Jan 1 14:19:51 2000
    ***************
    *** 269,275 ****
          if (gdnY < 50) /* allow 4 or 2 digit year specifications */
              gdnY += 2000;
          else
    ! if (gdnY < 100)
                  gdnY += 1900;
      
          result = (long) ((((gdnY-1901)*1461) >> 2) + monthDays[gdnM-1] + gdnD+365);
    --- 269,275 ----
          if (gdnY < 50) /* allow 4 or 2 digit year specifications */
              gdnY += 2000;
          else
    ! if (gdnY < 200)
                  gdnY += 1900;
      
          result = (long) ((((gdnY-1901)*1461) >> 2) + monthDays[gdnM-1] + gdnD+365); 

    -- 
+----------------------------------+--------------------------------------+
| Rob Janssen     uqbqn.stohnw@ibex.es | WWW: http://www.knoware.nl/users/rob |
| AMPRnet:     ceo.hgrhpo@cm110-106.liwest.at | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+----------------------------------+--------------------------------------+

    -- 
Hamish Moffatt       Mobile: +61 412 011 176     terhi.victor@logonet.com
Rising Software Australia Pty. Ltd.    http://www.risingsoftware.com/
Phone: +61 3 9894 4788    Fax: +61 3 9894 3362    USA: 1 888 667 7839

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