OLDAR(5)                COMMAND REFERENCE                OLDAR(5)



NAME
     oldar - old archive (library) file format

DESCRIPTION
     The old archive file format is not supported by current
     software. These files may be converted to the new format by
     arcv(1). Programs that work with archives know how to
     distinguish the old and new archive files, and usually print
     a message saying that the file is in the old format.

     Old archive files are those from the 32v and Third Berkeley
     edition archive programs. These files have the magic number
     (unsigned short) 0177545 at the start, followed by the
     constituent files, each preceded by a file header.  The
     header layout is:

          struct oar_hdr {
               char oar_name[14];
               short     oar_sdate[2];
               char oar_uid;
               char oar_gid;
               unsigned short oar_mode;
               short     oar_ssize[2];
          };

     The name is a blank-padded string.  The date is the
     modification date of the file at the time of its insertion
     into the archive.

     The date and size fields should be converted to long values
     for use.  They are arrays of short values in the structure
     in order to make the structure elements contiguous for use
     with read(2).

     There is no provision for empty areas in an archive file.

     Unlike the new archive format, the encoding of the header is
     not portable across machines, and files do not have to begin
     on an even boundary.

CAVEATS
     Old format files must be converted to the new archive format
     before use. This must be done by using arcv(1) and not by
     editing the file, since this may result in unrecoverable
     data.

     The programs more(1) and ex(1) do not allow viewing or
     editing of old format archives.

SEE ALSO
     ar(1), arcv(1), and ar(5).




Printed 5/12/88                                                 1

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