%% /u/sy/beebe/src/ndiff/ndiff-2.00/ChangeLog, Sun Dec 10 09:21:44 2000
%% Edit by Nelson H. F. Beebe <beebe@math.utah.edu>

2000-12-10  Nelson H. F. Beebe  <beebe@math.utah.edu>

	* Release 2.00: Final version.
	  The major new feature in this version is support for NaN and
	  optionally-signed Infinity.  This should eliminate bogus
	  differences reported by version 1.00 from differing
	  vendor-dependent representations of these values.

	  The only bug fix is addition of code to handle "-" as stdin.
	  This was documented in the manual pages for version 1.00, but I
	  forgot to implement it: mea maxima culpa!

	* awklib.c:
		* Update email address list in file header.

		* Add private file global variable _awk_lib_initialized,
		  and insert calls to ENSURE_INITIALIZATION() in all
		  global functions.  This guarantees proper initialization
		  at the cost of a single if-test; though not required for
		  ndiff, this code might be used elsewhere, so this
		  addition is an inexpensive safety feature.

		* Add private file globals _awk_NaN_regexp,
		  _awk_positive_infinity_regexp, and
		  _awk_negative_infinity_regexp.

		* Add private function _awk_regmatch().

		* Add code in _awk_open_infile() to handle special cases
		  of "-", "/dev/stdin", and "/dev/fd/0" [bug fix].

		* Add global function awk_terminate(), for symmetry with
		  awk_initialize(), and possible future use.

		  I had planned to add an interface to regcomp() to cache
		  compiled regular expressions in a hash table.  However,
		  profiling on large data files requiring ndiff run times
		  of several minutes showed that regcomp() takes only
		  about 0.5% of the total time, whereas regmatch()
		  accounts for about 43% of the total time, and is called
		  about 16 times more frequently than regcomp().  Caching
		  of compiled regular expressions is therefore not
		  worthwhile.

		* Add global functions awk_is_NaN(),
		  awk_is_positive_infinity(), and
		  awk_is_negative_infinity().

	* awklib.h:
	  Add declarations of awk_is_NaN(), awk_is_positive_infinity(),
	  and awk_is_negative_infinity().

	* configure.in:
	  Update DATE, VERSION, and VERSIONREGEXP, and correct tiny error
	  in a comment.  Also, remove AC_PROG_CXX, since that prevents
	  builds on systems that lack a C++ compiler.
	
	* INSTALL:
		* Update email address list.
		* Add pointers to IEEE and NIST Web sites for further
		  POSIX information, and lists of compliant systems.

	* Makefile.in: Update for version 2.00:
		* Add more check files (check023 -- check026).

		* Use $(PROGNAME) instead of ndiff in several places.

		* Add "make check" output line to tell what precision is
		  used.

		* Change order of link command arguments to make c89 on
		  FreeBSD 4.1.1 happy, sigh...
	
	* ndiff.c:
		* Update version number in file header.

		* Update email address list in file comment header and
		  opt_author().

		* Add support for new -www option (another table entry in
		  do_one_arg(), plus new function opt_www()).

		* Update comments about C standards, since the 1999
		  Standard is now available.

		* Call awk_terminate() in cleanup().

		* Add three more else-if branches in diff_field() to test
		  for NaN, +Infinity, and -Infinity.

		* Remove bogus trailing space in some option names in the
		  option table in do_one_arg().

		* Recognize "-" as a filename in do_one_arg() [bug fix].

		* Add usage() function, and in main(), check for omitted
		  filename arguments.
	
	* ndiff.man:
		* Update version number in file header.

		* Update email address list in file comment header and
		  AUTHOR section.

		* Add another line break in the floating-point number
		  regular expression.

		* Document patterns for NaN, +Infinity, and -Infinity.

		* Document new -www option.

	* README:  Update email address list.


2000-01-28  Nelson H. F. Beebe  <beebe@math.utah.edu>

	* Release 1.00: First released version of ndiff