File: version-2-8.text

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	AUTOCLASS C VERSION 2.8 NOTES 
====================================================================== 
======================================================================

Documentation:
------------------------------

  1. autoclass-c/doc/search-c.text -
        Add new search parameter "read_compact_p", which directs
        AutoClass to read the "results" and "checkpoint" files in
        either binary format -- ".results-bin"/".chkpt-bin"
        (read_compact_p = true); or ascii format -- ".results"/".chkpt"
        (read_compact_p = false).  The default is read_compact_p = true.



Programming:
------------------------------						

  1. autoclass-c/prog/globals.c -
        Update "G_ac_version" to 2.8.

  2. autoclass-c/prog/io-results.c -
        In "validate_data_pathname", prefer the user supplied file
        extension, and only attempt to open ".db2", and then
        ".db2-bin", if no extension (/name.) or an invalid extension
        is supplied.  Check for presence of '.' in pathname.

        In "validate_results_pathname" prefer the user supplied file
        extension, and only attempt to open ".result-bin", and then
        ".results", if no extension (/name.) or an invalid extension
        is supplied.  Check for presence of '.' in pathname.

        In "make_and_validate_pathname" check for presence of '.' in
        pathname.

        In "get_clsf_seq" simplify the test for "ascii" or "binary"
        results file format -- also more portable.

  3. autoclass-c/prog/search-control.c -
        In "autoclass_search" use make_and_validate_pathname and
        search parameter "save_compact_p" to determine file extension
        of "results" file prior to calling validate_results_pathname.

        Add "read_compact_p" search parameter for use in reading
        "results" and "checkpoint" files.

        Make short search trial printout more portable.

  4. autoclass-c/load-ac; autoclass-c/prog/autoclass.make.*
        Define make files with -I and -L parameters for SunOS 4.1.3 and
        change naming convention: .sun. => .sunos. or .solaris.
        Specifically the files are now --
        autoclass.make.solaris.cc, autoclass.make.solaris.gcc,
        autoclass.make.sunos.acc, and autoclass.make.sunos.gcc

  5. autoclass-c/prog/io-read-data.c, autoclass.h -
        In "translate_discrete", allocate space for translations
        using (strlen( value) + 1), rather than sizeof(shortstr) --
        prevents corruption of discrete data translation tables when
        translations are longer than (SHORT_STRING_LENGTH - 1) = 40
        characters. In "get_line_tokens" and "read_from_string", add
        length checking for "form"; make it and length check for
        "datum_string" explicit.  Increase output string length in
        "output_created_translations".

  6. autoclass-c/prog/io-read-data.c, autoclass.h -
        Increase from 3000 to 20000 the value of VERY_LONG_STRING_LENGTH 
        to handle very large datum lines.

  7. autoclass-c/prog/io-results.c -
        In VALIDATE_RESULTS_PATHNAME and VALIDATE_DATA_PATHNAME,
        use binary_file, rather than file, were it is intended.

  8. autoclass-c/prog/intf-reports.c, io-read-data.c, autoclass.h -
        Increase DATA_ALLOC_INCREMENT from 100 to 1000 for reading very
        large datasets.  Add DATA_ALLOC_INCREMENT logic of READ_DATA
        to XREF_GET_DATA.  This will prevent segmentation faults
        encountered when reading very large .db2 files into the 
        reports processing function of AutoClass.

  9. autoclass-c/prog/autoclass.make.solaris.cc, autoclass.make.solaris.gcc,
      autoclass.make.sunos.acc, and autoclass.make.sunos.gcc -
        Comment out "depend: $(SRCS)", so that all source files are not
        compiled even when only one file changes.

 10. autoclass-c/prog/intf-reports.c -
        In FORMAT_DISCRETE_ATTRIBUTE, do not process attributes with
        warning or error messages -- this prevents segmentation faults.

        In XREF_GET_DATA, free database allocated memory after it is 
        transferred into report data structures.  This reduces the
        amount of memory required when generating reports for very
        large data bases, and prevents running out of memory. 

        In all functions calling malloc/realloc for dynamic memory
        allocation, checks have been added to notify the user if
        memory is exhausted.

 11. autoclass-c/load-ac & autoclass-c/prog/autoclass.make.hp.cc -
        Port the "make" file for HP-UX operating system using the
        bundled "cc" compiler.


======================================================================