make_fname

Source: io/make_fname.pro

 MAKE_FNAME
       Produce the filename of a LAN archive file given the year and the day.

 Call:
       name = make_fname(trange, arch_spec, spath[, oldname])

 Return Value:
       name    string  The name of the file for the given year and day.

 Arguments:
       trange   double  input  The julian date of the start & end.
       arch_spec struct input   A structure specifying how to generate
                        the filename
       spath    string  input   A string array listing the directories
                        in which to search.
       oldname string  input   Optional filename not to be matched.

 Keywords:
        new_search      If set, then (1) regenerate the files list,
                        and (2) do a backwards scan through dates
                        up to the duration of the file, if necessary.

 History:
       Prototype: 29/1/91; SJT
       Changed to a full LAN archive name: 22/2/91; SJT
       Accept file type, to accomodate split archives: 12/3/91; SJT
       Accept archive type to allow ULA or UAV rates to be handled:
                                                        22/3/91; SJT
       Try both .lan and .rat for file type in ULA case: 19/4/91; SJT
       Unified version: 28/8/91; SJT
       DO directory setting in here: 3/9/91; SJT
       Add optional check that filename is not the same as previous (passed
               to procedure as a 3rd argument) 18/9/91; SJT
       Prepend directory name in UNIX: 8/10/91; SJT
       Add TRK support: 25/11/91; SJT
       Truncate version numbers: 16/1/92; SJT
       Add QULA support: 20/1/92; SJT
       Remove cd (replace with form_fname): 4/2/92; SJT
       Add support of PHA and MFS files from PHAGEN: 23/6/92; SJT
       Add support for compressed 1d & 6h archives: 26/10/92; SJT
       Add forward search if search fails backwards: 28/10/92; SJT
       Change backscan length to 3 for TRK: 1/2/93; SJT
       Add decompression of compressed file in unix: 12/3/93; SJT
       Reduced calls to findfile: 2/7/93; SJT
       Add UAF files: 23/7/93; SJT
       Add backwards keyword: 6/8/93; SJT
        Add support for GNU zipped files: 30/9/93
        Remember filenames from one invokation to the next: 6/10/93;
        SJT
        Add CUA[VF] files: 22/8/94; SJT
        Correct name list when file is decompressed: 4/10/94; SJT
        Spin off some of the messy bits to subprograms also make I and
        Q files automatic: 21/10/94; SJT
        Incorporate CDF: 3/11/94; SJT
        Extend to UDS: 3/11/94; SJT
        Add file_time key (for SWOOPS uds): 8/11/94; SJT
        Extra safety lock on forward search & old name match: 27/6/95;
        SJT
        Fix for dates beyond 2000: 1/12/95; SJT
        Decompression now removed since HSIO now supports dynamic
        decompression: 4/12/97; SJT
        Add 'ala' name for EPAM .pha files: 3/11/98; SJT