___________________________________
|      |  |  |     |  _  |     |  |
|  |___|  |  |  |  |    _|  |  |  |    GNU GLOBAL source code tagging system
|  |   |  |  |  |  |     |     |  |
|  ~~  |   ~~|     |  ~  |  |  |   ~~|          for all hackers.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Copyright (c) 2000-2021
	Tama Communications Corporation

 This file is free software; as a special exception the author gives
 unlimited permission to copy and/or distribute it, with or without
 modifications, as long as this notice is preserved.

 This program is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

		----------------------------------

ChangeLog about GNU GLOBAL

June 6 2024, Shigio YAMAGUCHI

	[plugin-factory/pygments_parser.py.in]
	All regular expressions using '\' were made literal with 'r' flag.
		'\s' -> r'\s'

	Python 3.6 and later considers \s an invalid escape sequence
	(DeprecationWarnings). But DeprecationWarnings are silenced by default.
	Python 3.12 and later displays it as a SyntaxWarning by default.

	[test.py]
	+-------------
	|print('\s')
	+-------------

	$ python3.11 test.py
	\s
	$ python3.12 test.py
	/***/***/test.py:1: SyntaxWarning: invalid escape sequence '\s'
	  print('\s') 
	\s

April 23 2024, Shigio YAMAGUCHI

	[plugin-factory/Makefile.am]
	Added '-shared' option to XXXX_la_LDFLAGS not to install static library.

March 4 2024, Shigio YAMAGUCHI

	Changed the limit values in libutil/xargs.c.

	UNIX: Changed the limit value as follows:
		if (limit > 20 * 1024)
			limit = 20 * 1024;
		|
		v
		if (limit > 128 * 1024)
			limit = 128 * 1024;
		This value is due to xargs in GNU findutils-4.9.0.

	WIN32: Changed the limit value from 2047 to 8191.

December 14 2023, Shigo YAMAGUCHI

	Now Pygments plug-in parser uses Universal Ctags instead of Exuberant Ctags.
	Please note the following descriptions:

	[gtags.conf.in]
		pygments-parser|Pygments plug-in parser:\
			...
			:ctagscom=@UNIVERSAL_CTAGS@:\	<===
	[plugin-factory/pygments_parser.py.in]
		UNIVERSAL_CTAGS = "@UNIVERSAL_CTAGS@"	<===

	This means you have to do the following configuration to use Pygments.
		$ ./configure --with-universal-ctags=...

November 19 2023, Shigo YAMAGUCHI

	[plugin-factory/PLUGIN_HOWTO.pygments]
	I changed the last sentence as follows:

	Though it is considered a separate package, not part of GLOBAL proper,
	we included it for user's convenience.
	|
	v
	Now it is maintained as a part of GNU Global.

April 6 2023, Shigo YAMAGUCHI

	The --with-pread-pwrite option of configure script was removed.
	Now configure script automatically probes for pread()/pwrite().

	However, it is not enabled on Cygwin environment, because it did not
	work properly on Cygwin in the past.  If requested by Cygwin users,
	I will change it.

December 13 2021, Shigio YAMAGUHI

	[plugin-factory/PLUGIN_HOWTO.universal-ctags]
	[plugin-factory/uctags-scheme.c-diff]
	I wrote a document titled 'How to get Universal Ctags to handle references.'

July 19 2021, Shigio YAMAGUHI

	Now you can build Global with external SQLite3 library.
	--with-sqlite3[=dir]	By default, the embedded version is used.

	$ ./configure --with-sqlite3=/opt/local
	...
	$ global --version
	...
	Powered by Berkeley DB 1.85 and SQLite3 3.35.5.
						======= (depends on your system)

June 30 2021, Shigio YAMAGUHI

	Shebang rules:
	Shell	use #!/bin/sh
		It works 100% in POSIX.
	Perl	should be called as a command argument like follows:
                $ perl ./xxxx.pl
		#!@PERL@ should not be used, because perl scripts are used
		before the config phase in Global,
	Python	use #!@PYTHON@
		Don't use fixed names, because at least two incompatible versions
		of python are distributed. The command name may be python2 or python3.

June 7 2019, Shigio YAMAGUCHI

	Removed the -T option of perl from the CGI scripts in htags/,
	because env(1) cannot treat it correctly without -S option on FreeBSD.

	$ cat test.sh
	#!/usr/bin/env perl -T
	print "Hello!\n";
	$ ./test.sh
	env: perl -T: No such file or directory

March 21 2019, Shigio YAMAGUCHI

	Moved convert.c, convert.h, output.c, output.h from 'global/' to 'libutil/'.

July 15 2018, Shigio YAMAGUCHI

	[icons, jquery]
	Moved 'icons/' and 'jquery/' from the root directory of the project to 'htags/'.
	It seems to be a more suitable place.

June 11 2018, Shigio YAMAGUCHI

	[gtags-cscope/find.c]
	Replaced the system(3) function with the secure_popen utilities (libutil/secure_popen.c)
	for security and readability.

March 15 2018, Shigio YAMAGUCHI

	Moved sqlite3.c and sqlite3.h from 'libglibc/' to 'libdb/'.
	It seems to be a more suitable place.

December 12 2017, Shigio YAMAGUCHI

	[plugin-factory/maps2conf.pl]
	Added new script 'maps2conf.pl', which converts from the output of 
        'ctags --list-maps' into a gtags.conf record. It supports Exuberant Ctags
	and Universal Ctags.

	[usage]
	perl maps2conf.pl <ctags-path> <plugin-path> [<label>]

	The default of <label> is 'default'. You can use this script to make
	'gtags.conf' file for ctags plug-in parser. Please try this:

	$ perl maps2conf.pl /usr/local/bin/ctags '$libdir/gtags/universal-ctags.la' >gtags.conf
	$ gtags         # use Universal Ctags as a parser

	It assumed that '/usr/local/bin/ctags' above is Universal Ctags.

August 30 2017, Shigio YAMAGUCHI

	[libutil/find.c]
	In addition to the skip by regular expression, the following
	files are skipped in ignore() function previously now.
	o Files which start with '.'
	o Tag files (GPATH, GTAGS, GRTAGS)

	The regular expression is left, because xxx_filelist() functions
	require it.

December 30 2016, Shigio YAMAGUCHI

	Added taint mode to the following CGI scripts:
	global.cgi.in
	completion.cgi.in

December 21 2016, Shigio YAMAGUCHI

	Rewrote the following functions without popen(3) in order not to cause
	unnecessary security anxiety.
	completion_idutils()
	idutils()

	These functions are called from CGI scripts of htags(1).

December 16 2016, Shigio YAMAGUCHI

	Rewrote the following CGI scripts using perl5 syntax:
	global.cgi.in
	completion.cgi.in

	There were many perl5.* incompatible with each other in the past.
	Even then perl4 syntax always worked correctly. But this problem
	was a thing of the past. Perl4 syntax is now meaningless.

October 22 2016, Shigio YAMAGUCHI

	Removed the following files:
	BOKIN_MODEL
	BOKIN_MODEL_FAQ

	BOKIN model was finished. Now GLOBAL is not a BOKINware.

October 8 2016, Shigio YAMAGUCHI

	Added the following library source code. Though it's a GNU version,
	I derived them from the latest Universal Ctags archive not to make
	differences.

        libglibc/fnmatch.c
        libglibc/fnmatch.h

March 9 2016, Shigio YAMAGUCHI

	Now, the following files in datadir are static.
	- completion.cgi
	- global.cgi
	- jscode_suggest
	- jscode_treeview
	- style.css

February 3 2016, Shigio YAMAGUCHI

	[Plug-in parser]
	Added new plug-in parser 'universal-ctags.la'.
	It is made using exuberant-ctags.c and -DUSE_EXTRA_FIELDS compile option.

	[gtags.conf]
	Added new entry 'universal-ctags'.
	Added new variables 'ctagscom'.

	[Plug-in interface]
	Added new plug-in interface function getconf().
	You can access config variables of gtags(1) from plug-in parsers.

Nov 30 2015, Shigio YAMAGUCHI

	Replaced @libdir_QUOTED@ with configuration variable in gtags.conf.in.

Nov 21 2015, Shigio YAMAGUCHI

	Removed ctags-5.8.patch, because Universal Ctags supports reference tags
	by itself now.
	Added new test for Universal Ctags.

Oct 14 2015, Shigio YAMAGUCHI

	[configure.ac]
	Replaced @prefix_QUOTED@ with @libdir_QUOTED@ in gtags.conf.in.
	From now on, you can use the --prefix, --exec-prefix and --libdir
	options to set a value of @libdir_QUOTED@. This was done by Kevin Farshaw.

	[libparser/parser.c]
	Changed dynamic loading code using ld_dlopenext().
	(Fedora packaging guidelines prohibit .la files)

	if (ld_dlopen('foo.la') == FAILED)
		error_and_exit();
	|
	v
	if (ld_dlopen('foo.la') == FAILED)
		if (ld_dlopenext('foo') == FAILED)
			error_and_exit();

	From now on, extension of DLL is needless.

June 22 2015, Shigio YAMAGUCHI

	To recover easiness of reading source code, removed Doxygen tags
	in the source code except for the followings:
	('description' should be plain text)

	/**< description */

	/**
	 *	description
	 *      @param[in]      var     description
	 *      @param[out]     var     description
	 *      @param[in,out]  var     description
	 *      @return                 description
	 */

November 10 2014, Shigio YAMAGUCHI

	Included SQLite3 version 3.8.7.1 into 'libglibc'.

November 7 2014, Shigio YAMAGUCHI

	Added support of Sqlite3 API for tag files (alpha quality).
	If you will test the code then please do as follows:

        [building phase]
        $ ./configure --with-sqlite3

        [executing phase]
        $ gtags --sqlite3

June 28 2014, Shigio YAMAGUCHI

	New environment variable GTAGSLOGICALPATH was added.
	If it is set then GLOBAL use logical path (PWD), else
	physical path. This variable is now undocumented.

March 17 2014, Shigio YAMAGUCHI

	libutil/pathconvert.c module was divided into the following two modules:
	o libutil/encodepath.c
	o global/convert.c
	According to the change, the function of the --path command of gtags(1)
	(undocumented) was moved to global(1)'s --path-convert command.

December 18 2013, Shigio YAMAGUCHI

	The following paths were removed from the candidate list of configuration file.

	/etc/global.conf (OLD_GTAGSCONF)
	/etc/gtags/global.conf (OLD_DEBIANCONF)

	These paths were not documented once.

November 17 2013, Shigio YAMAGUCHI

	Added two functions: copyfile(), copydirectory(). They remove the necessity
	of external command 'cp'.

June 17 2013, Shigio YAMAGUCHI

	Dependence to dbop.c module was eliminated from assoc.c module.

June 12 2013, Shigio YAMAGUCHI

	File 'HTML/sitekey' (--system-cgi option) was removed since it is unnecessary.

December 11 2012, Shigio YAMAGUCHI

	Some Automake macros were changed as follows to avoid warning messages.
	o INCLUDES was changed to AM_CPPFLAGS
	o AC_PROG_RANLIB was removed.

December 3 2012, Shigio YAMAGUCHI

	[global/literal.c]
	Included fgrep's code of 4.3BSD.

October 20 2012, Shigio YAMAGUCHI

	Added support for type string of ctags.
	Configure script detects whether ctags has --gtags option or not.
	However, I don't know whether the ctags which has this option will be released.

	Exuberant Ctags with --gtags option:
	$ ctags --gtags -x ...
	D main              320 global/global.c  main(int argc, char **argv)
	R NULL              325 global/global.c  const char *av = NULL;
	=
	^-- Type string (D: definition, R: other than definition)

October 13 2012, Shigio YAMAGUCHI

	Comments were rewritten in the Doxygen style. Submitted by Simon Dommett.
	To generate a document, please invoke make command in the root directory
	of the project like follows:

	$ make doxygen

	doxygen 1.8.2 is required.

June 9 2012, Shigio YAMAGUCHI

	Added BUILD_TOOLS file, which includes the list of version numbers
	of the building tools used for building GLOBAL. It is automatically
	generated by reconf.sh.

March 15 2011, Shigio YAMAGUCHI

	Included cscope's source code.

	[Added source files]		[cscope-15.7]
	m4/check_curses.m4		configure.in
	gtags-cscope/manual.in		doc/cscope.1
	gtags-cscope/alloc.c		src/alloc.c
	gtags-cscope/alloc.h		src/alloc.h
	gtags-cscope/basename.c		src/basename.c
	gtags-cscope/build.c		src/build.c
	gtags-cscope/build.h		src/build.h
	gtags-cscope/command.c		src/command.c
	gtags-cscope/constants.h	src/constants.h
	gtags-cscope/display.c		src/display.c
	gtags-cscope/edit.c		src/edit.c
	gtags-cscope/exec.c		src/exec.c
	gtags-cscope/global-cscope.h	src/global.h
	gtags-cscope/gtags-cscope.c	src/main.c
	gtags-cscope/help.c		src/help.c
	gtags-cscope/history.c		src/history.c
	gtags-cscope/input.c		src/input.c
	gtags-cscope/library.h		src/library.h
	gtags-cscope/logdir.c		src/logdir.c
	gtags-cscope/mouse.c		src/mouse.c
	gtags-cscope/mygetenv.c		src/mygetenv.c
	gtags-cscope/mypopen.c		src/mypopen.c
	gtags-cscope/version-cscope.h	src/version.h

February 4 2011, Shigio YAMAGUCHI

	Configure.ac was modified to detect POSIX sort program automatically.

August 30 2010, Shigio YAMAGUCHI

	Renamed the style sheet file in the source package from style.css to
	style.css.tmpl, because to follow the custom of naming of other templates.

August 12 2010, Shigio YAMAGUCHI

	Modification of the -S option.

	o Renamed from '-S(--secure-cgi)' to '--system-cgi' because the
	  parameter is changed.
	o Changed the site key directory from 'datadir' to 'localstatedir'
	  because 'datadir' is for read-only data.
	o Changed the permission of the site key directory from 773 to 775.

	These most was suggested by Ron Lee.

June 27 2010, Shigo YAMAGUCHI

	Modification of the -S option.

	1. New htags requires a unique key as the parameter of the -S option.
	   (It is a incompatible change.)
	2. Htags makes a file whose name is the key in shared area, and
	   put the path of the HTML directory in it.
	3. To make the file name unique, a key that already exists
	   is not allowed without --over-write option.

	[in /var/src]
	$ htags ... -S key1
		       ====
			 |
			 +----------------+-----+
					  v     |               
	[/usr/local/share/gtags/sitekeys/key1]  |
	+--------------------------------       |
	|/var/src/HTML                          |     ... (2)
						|
	[/var/src/HTML/index.html]              |
	+--------------------------------       |
	|...                                    v
	|<input type='hidden' name='id' value='key1'> ... (1)
					       ====

	The center CGI script can know the path of the HTML directory by the following
	method.

	(1) get a unique key from the variable 'id'
		=> 'key1'
	(2) read directory name from '/usr/local/share/gtags/sitekeys/' + 'key1'
		=> '/var/src/HTML'

	This mechanism conceals the real path name of the HTML directory.

May 21 2010, Shigo YAMAGUCHI

	* Removed support for command layer plug-in parser(gtags-parser/).

May 20 2010, Shigo YAMAGUCHI

	* Changed the architecture of gtags(1) from 2 pass to 1 pass.

	[Old]

        Pass 1:                      +-------+ 
          source files =============>| gtags |============> GTAGS
                                     |       |============> GPATH
                                     |       |============> temporary file
                                     +-------+
        Pass 2:                      +-------+
         temporary file ============>| gtags |============> GRTAGS
                  GTAGS ============>|       |============> GSYMS
                                     +-------+
	[New]

        Pass 1:                      +-------+
          source files =============>| gtags |============> GPATH
                                     |       |==>[sort]===> GTAGS
                                     |       |==>[sort]===> GRTAGS
                                     +-------+
	(1) 1 pass architecture
		GLOBAL doesn't use GSYMS any longer. Symbols stored there before are
		put into GRTAGS instead. The divergence to GRTAGS and GSYMS is done
		in referring stage (gtags_first() and gtags_next()) not in generating
		stage. This change removes complexity from the program very much.
	 
	(2) Sorted writing
		The (1) brings a big GRTAGS and decrease at the writing speed.
		To avoid it, the records written to tag files are sorted beforehand.
		This function becomes effective if DBOP_SORTED_WRITE flag is specified
		for function dbop_open(). It uses an external POSIX sort program.

	Note: In the new method, temporary file doesn't become unnecessary.
	Because the external sort program also uses temporary files for its job.

	This small work greatly depends on the big work by Hideki IWAMOTO on February 1 2010.

April 27 2010, Shigo YAMAGUCHI

	* Changed the cache format (htags/cache.c) like follows:

	(1) Duplicate tag file
	     +--------------------+           +---------------------+
	     | <fid> <frequency>\0|        -> | <fid>\0<frequency>\0|
	     +--------------------+           +---------------------+
						'D/<fid>.html'
	(2) Tag definition
	     +---------------------------+    +----------------------+
	     |<line number> <file name>\0| -> |<line number>\0<fid>\0|
	     +---------------------------+    +----------------------+
						'S/<fid>.html#<line number>'

March 8 2010, Shigio YAMAGUCHI

	* Changed the default parser of gtags(1) from gtags-parser(1) to libgloparser.a.
	  Config parameter 'use_builtin_parser' is not used any longer. If the config
	  variable GTAGS is defined then gtags(1) use the command layer parser specified
	  by the variable as well as before. But it is obsolete.

February 27 2010, Hideki IWAMOTO

	* Added support of function layer plugin parser.
	  Libtool 2.2.6b or later is required to build CVS version.

February 3 2010, Shigio YAMAGUCHI

	* Use invisible temporary files instead of visible files (htags/assoc.c).

February 1 2010, Hideki IWAMOTO

	* Added built-in parser to improve the performance of making tag files.

	  When the built-in parser is used, the source files are parsed only once. 
	  The candidate of reference and other symbols are written to the temporary
	  file in Pass1, and read in Pass2.

	Pass 1:
	                             +-------+ 
	  source files =============>| gtags |============> GTAGS
	                             |       |============> GPATH
	                             |       | tag record
	                             |       |============> temporary file
	                             +-------+
	Pass 2:
	                 tag record  +-------+
	 temporary file ============>| gtags |============> GRTAGS
	                             |       |
	          GTAGS ============>|       |============> GSYMS
	                             +-------+

February 18 2009, Shigio YAMAGUCHI

	* Rewrote the stack in libutil/find.c using the varray (libutil/varray.c)
	  instead of static array.
	* Changed gtags(1) not to do useless inspection for the files in the
	  directories which are listed in the skip list.

September 27 2008, by Shigio YAMAGUCHI

	* Changed the default cache size of DB library from 5M to 50M bytes.
	* Recovered the code in which pread/pwrite is used in BSD db library.
	  However, this code is not automatically used. To include the code,
	  please invoke configure script with the --with-pread-pwrite option.
	  The original code was written by Hideki IWAMOTO.

July 14 2008, by Shigio YAMAGUCHI

	* Changed gtags(1) to skip all files whoes first character of name is '.'.

	The following path was deleted from the DEFAULTSKIP in configure.ac, since new
	rule covers them.

	.notfunction
	.gdbinit
	.cvsrc
	.cvsignore
	.gitignore
	.cvspass
	.cvswrappers
	.deps/
	.snprj/
	.svn/
	.git/

April 21 2008, by Shigio YAMAGUCHI

	* gtags.vim: Stopped use of temporary file.

March 25 2008, by Shigio YAMAGUCHI

	* gtags.vim, gtags.pl: rewritten using new '--from-here' option of global(1).
	* Added htags/ghtml.cgi.tmpl.
	* Described the method of apache setting as a comment in htags/global.cgi.tmpl.in.
	* Modifications to allow symbolic link.
	  To realize it, normalize_path() and abs2rel() in libutil/abs2rel.c module is used
	  instead of realpath(3) library function.
	* gtags.el and gtags.vim are rewritten using new '--from-here' option of global(1).

October 26 2007, by Shigio YAMAGUCHI

	* Added file 'DONORS' which includes the list of donations to GNU GLOBAL.
	* Idset module: Performance improvement of idset module by using "unsigned long"
	  instead of "unsigned int" for bitmask. This is necessary to use 64 bit processor
	  effectively.

July 6 2007, by Shigio YAMAGUCHI

	* Migrated to GPLv3 and LGPLv3.
	* gtags.conf.in: Migrated to simple all-permissive license.

May 5 2007, by Shigio YAMAGUCHI

	* New files: BOKIN_MODEL, BOKIN_MODEL_FAQ, DONORS

March 10 2007, Shigio YAMAGUCHI

	* gtags.el: Added (provide 'gtags).
	* libutil/env.c: Use putenv(3) if it is available else use setenv(3).
	  Some systems don't have setenv(3).

January 29 2007, Shigio YAMAGUCHI

	* Further compression of tag file (format version 5).
	  - Tag name is compressed.
	  - Each line number might be expressed as difference from the previous
	    line number except for the head.
	  	ex: 11,3,2 means '11 14 16'.
	  - In addition, successive line numbers are expressed as range (n1-n2).
	  	ex: 11-3 means '11 12 13 14'.

	* global(1): Sort filter was moved from the output filter to the input filter.

	   ( input )     |    ( m a i n )      |      ( o u t p u t )
	   gtagsop       |      global         |  tagsort   |  pathconvert
	  ---------------+---------------------+------------+--------------
	   expand tag +------------+             sort tag     convert path
				   |                 |
	       +-------------------------------------+
	       v                   v
	   sort tag        expand tag                         convert path

	  Instead, the processing of expanding tag was moved to the main module.
	  This improves the performance when compact format is used, since
	  sorting is done before expanding.

	  Recent architecture (GLOBAL-5.0 - 5.3)

	  +===========================================+
	  |global(write)->[sort filter]->[path filter]|->[stdout]
	  +===========================================+
	 
	  New architecture (GLOBAL-5.4 -)
	  
	  +===========================================+
	  |[sort filter]->global(write)->[path filter]|->[stdout]
	  +===========================================+

	* Removed some code which call the following method:
	  putenv utimes
		They are not natural method today.
	  pread pwrite
		They are risky since they are not used so much and are not
		often so tested.  It was found that the pread and pwrite in cygwin
		are buggy. Though it is not our business, user is not guilty too.
	  strdup
		It is not needed since we use check_strdup() instead.
	* Added some new modules.
	  pool - allocate and free memory for temporary use.
	  fileop - operation for opening and closing file.
	* Added some new methods.
	  strmake module - strcmp_withterm()
	* Removed some modules.
	  global/filter, libutil/tagsort
	* idset module:
	  - Added new functions idset_first(), idset_next() and idset_empty().
	  - Changed bitmask from char(8 bits) to integer (maybe 32 or 64 bits)
	    to improve performance.

November 20 2006, Shigio YAMAGUCHI

	* gtags.el:
	  - gtags-make-complete-list is deprecated.
	    Added gtags-completing-gtags, gtags-completing-gsyms and gtags-completing.
	  - Throw away the output of gozilla in 'gtags-display-browser'.

August 8 2006, Shigio YAMAGUCHI

	* htags/fileindex.c: Rewritten using recursive call instead of stack structures.
	* gozilla.c: Fixed getURL() according to new GPATH.
	* Replaced malloc(), realloc() and stdup() with check_xxxx() functions.
	* Added icon files (icons/*png).

June 10 2006, Shigio YAMAGUCHI

	* Recovered original texinfo file names (.txi -> .texi).

April 21 2006, Shigio YAMAGUCHI

	Change in tag format:
	* Moved to new tag format. New tag format is as follows.
	  GTAGS (with compress option)
		<file id> <tag name> <line number> <compressed line image>
	  GRTAGS, GSYMS (with compact option)
		<file id> <tag name> <line number>[,...]
	* Now, GPATH has path names of not only source files but
	  also other text files. The following commands no longer
	  traverse file system. They read GPATH instead.
		global(1) with the --other option.
		htags(1) with the --other option.

	Change in architecture:
	* Changed the filtering architecture of global(1).
	
	  Old architecture (- GLOBAL-4.7.8)

	  process1          process2       process3
	  +=============+  +===========+  +===========+
	  |global(write)|->|sort filter|->|path filter|->[stdout]
	  +=============+  +===========+  +===========+
	
	  New architecture (GLOBAL-5.0 -)

	  1 process
	  +============================================+
	  |global(write) ->[sort filter]->[path filter]|->[stdout]
	  +============================================+
	
	  For the convenience of debugging, the old architecture is
	  also available. If macro EXTERNAL_FILTER is defined in filter.c
	  old architecture is selected.

	  The following options are also offered. (These options will be
	  deleted perhaps sooner or later.)

	    gtags --path={absolute|relative} --format={path|ctags|ctags-x|grep}
	    gtags --sort --format={path|ctags|ctags-x|grep} [--unique]
	    global --nofilter=[{path|sort}]
	    global --filter=[{path|sort}]
	    global --nosource
	
	  Moved the processing by which various formats are generated from
	  the main body of global(1) to the path filter. The main body
	  generates only two formats: path and ctags-x.
	  Path filter generates various formats which are given by the
	  --result=<format> option.

	Change in CGI mechanism:
	* The 'cgi-bin/' directory which generated by htags(1) doesn't
	  have any tag files. CGI script uses the tag files in the root
	  directory of a source project instead.

	New modules:
	* Added strhash module (strhash.c and strhash.h) to libutil.
	  Replaced the hash mechanism for compact format with this module.
	* Added xargs module (xargs.c and xargs.h) to libutil.
	  Replaced the xargs(1) like mechanism with this module.
	* Added pathconvert module (pathconvert.c and pathconvert.h) to libutil.
	  This module composes a part of an internal pipeline.
	* Added tagsort module (tagsort.c and tagsort.h) to libutil.
	  Replaced external sort filter (gnusort) with internal one
	  (tagsort module). Gnusort was removed. As a result, GLOBAL
	  became free from dependence on external commands.
	* Included GLIBC files obstack.c, obstack.h, hash-string.c and
	  hash-string.h.

	Internal options:
	* Removed two hidden options, --find and --other from gtags(1),
	  since they are no longer used.
	* Added new internal format 'ctags-xid' of global(1).
	  The anchor generation method of the global.cgi was changed.
	  Global.cgi script was modified to use the --result=ctags-xid
	  option of global(1)
	* Removed the -cc, -ccc, -cccc option of gtags(1).
	  These options were undocumented and only for testing.
	* Removed two hidden options, --find and --other from gtags(1),
	  since they are no longer used.

	Coding style:
	* End of support of K&R.
	* Changed function declarations to ANSI C style.

September 30 2005, Shigio YAMAGUCHI

        * Updated GNU Free Documentation License.(1.1->1.2)
        * Updated doc/texinfo.tex using texinfo-4.8.
        * BSD advertising clause was deleted, according to the declaration
          by UCB.
        * Added new module idset.
        * Added new function exec_line_limit() in env.c.
        * Added new function find_open_filelist() for the --file=xxx option.
          Find_read() and find_close() is shared by both find_open_filelist()
          and find_open().
        * Added new config option --with-db185-compat[=DIR].
          This is not for normal use, but for debugging.
        * Decreased use of popen() by moving the conversion from tabs to
          spaces into htags.
        * Reimplemented 'gtags --sort' without gnusort.
        * The default cache size was changed from 500000 to 5000000.
          Though I was assuming the machine equipped with 32-64MB,
          in a recent machine, even small one has 256-512MB memory.

May 12 2005, Shigio YAMAGUCHI

        * htags: New macro TOPDIR and SUBDIR added for readability.
        * htags: Quoted the "&" in attribute value.
        * Changed the address of FSF for each file.

April 19 2005, Shigio YAMAGUCHI

	* htags: Added new functions to generate anchor tag.
	  For <a href=*** ...>
	  - gen_href_begin_with_title_target()
	  - gen_href_begin_simple()
	  - gen_href_begin()
	  - gen_href_begin_with_title()
	  - gen_href_end()
	  For <a name=***>
	  - gen_name_number()
	  - gen_name_string()
	* htags, gtags-parser: Defined lex name generation rule.
	  - Change prefix * to *_.
	  - New lex name generation rule.
	  - New macro definition (LEXTEXT, LEXLENG, ...))
	* Added new macro STATIC_STRBUF(sb).
	* Added new macros (PART_TAG, PART_LNO, PART_PATH, PART_LINE).
	* strbuf.[ch]: Memory management was made more efficient.
	* Added const prefix to char * if it is suitable.
	* Install gtags.el into the $datadir/gtags directory instead of
	  the site lisp directory because the installation procedure
	  fails when the site lisp directory doesn't exist.

February 26 2005, Shigio YAMAGUCHI

        * Required version of autotools was updated.
          - Autoconf 2.59
          - Automake 1.9.3
          Configure.ac was modified according to the new style.
        * Install gtags.el into the site lisp directory.
        * When child process terminates abnormally, the program
          execution is ended.
        * The gctags directory was renamed to gtags-parser according to
          the renaming of the command.
        * gtags-parser: Modified to use a switch table for switching
          language.

November 11 2004, Shigio YAMAGUCHI

        * Assembly language parser rewritten using Yacc.
        * libutil/strmake.c: strtrim() added.
        * libutil/varray.c added.

        Decrease in dependency to external commands:
        * The sed(1), sort(1) and find(1) are not necessary any longer.
        * The support of find(1) as a method of directory traversing
          was ended. As a result, dirent(3) became indispensable.
          The configuration phase was changed like follows:

                if dirent(3) exist then
                        use dirent(3)
                else if find(1) exist then
                        use find(1)
                else
                        ERROR
                        |
                        v
                if dirent(3) exist then
                        use dirent(3)
                else
                        ERROR
        * Htags.pl was removed completely. Therefore, the --date, --pwd,
          --write and --scandb option of gtags(1) which was used internally
          by htags.pl, were removed.
        * Includes GNU sort as part of GLOBAL package.
          This solves following troubles:
          - A certain operating system has another 'sort' command
            that specification is different from GNU sort. Unluckily,
            the command is often invoked for GLOBAL.
          - Multi-language version of sort is often very slow. Since GLOBAL
            doesn't support multi-language, the slowness is quite meaningless.
          - In the past, the specification of sort command was changed.

October 6 2004, Shigio YAMAGUCHI

	* libutil/langmap.c, langmap.h added.
	  Config variable 'langmap' will be added officially sooner or later.
	* gctags/asm_res.in and htags/asm.l added.
	* fileindex.c: makeincludeindex() was cut out from makefileindex()
	  for statistic.
	* The priority of the method selection for directory traversing
	  was changed like follows:

		if find(1) exist then
			use find(1)
		else
			use dirent(3)
			|
			v
		if dirent(3) exist then
			use dirent(3)
		else if find(1) exist then
			use find(1)
		else
			ERROR

	* gozilla: removed the Win32 version of sendbrowser, using a direct
	  call to ShellExecute (since the browser probably isn't on the path,
	  and -remote doesn't seem to work on Windows).
	* htags/src2html.c: Modified to use a switch table for switching
	  language.

August 26 2004, Shigio YAMAGUCHI

	* Moved function now() from gtags.c to libutil/date.c.
	* htags: Changed so that the path passed to CGI might be encoded to %xx.
	* htags: Rewritten in C language.
	* htags: The use of the 'gtags --write' was stopped.
	* die.c: New function sethandler() and warning() added.
	* gctags/reserved.pl: The use of the --key-positions option of gperf(1)
	  was stopped. We need gperf-3.0.1 instead.

June 1 2004, Shigio YAMAGUCHI

	* htags: Function usable() was changed to the same specification
	  as usable() in libutil/usable().
	* htags: Execution path of global(1) was changed to the absolute path.
	* htags: Write FILEMAP file for reference from external system.
	* conf.c: New config variable 'bindir' and 'datadir' added.
	* w32/ directory removed.

Feb 1 2004, Shigio YAMAGUCHI

	* Rewrite strbuf_putn() without snprintf().
	* Created datadir, the default is '/usr/local/share/gtags'.
	  The following files are installed into the directory:
	  AUTHORS COPYING ChangeLog FAQ INSTALL LICENSE NEWS README THANKS
	  globash.rc gtags.conf gtags.el gtags.pl gtags.vim nvi-1.79-gtags.diff

Oct 3 2003, Shigio YAMAGUCHI

	* gtags.conf.in, libutil/conf.h.in: Now gtags.conf and conf.h
	  are generated by Autoconf.
	* The priority of the method of directory traverse was reversed again,
	  because, in some GNU/Linux, struct dirent has a member d_type but
	  always return 0. As the result, if find(1) is available then use it,
	  otherwise use dirent(3).

July 2 2003, Shigio YAMAGUCHI

	* gctags: If you want to build this parser from original source in
	  CVS repository then it is necessary to install flex(1) and gperf(1)
	  in your environment. (Since both of them are GNU software,
	  you can get them from GNU ftp site.)
	* reserved.pl: Generate C and Perl code for locating reserved words.
	* gtags.c: The --createdb and the --readdb option which used for anchor
	  database were removed, because there is no necessity any longer.

June 5 2003, Shigio YAMAGUCHI

	* libutil/env.c: replace putenv() and setenv() with set_env();
	* libutil/char.c,char.h: New files.
	* libutil/find.c: Skip symbolic links to eliminate the difference
	  between find(1) version and dirent(3) version.
	* htags.in: Remove tag name and line image from cache record.
	  This made cache file smaller.
	* htags.in: Stop using anchor db. Up to now, only gtags had called
	  the parser. But hereafter, the parser will be called by both
	  gtags and htags.
	* global.c: About the -g option, implementation using grep + xargs
	  was removed.
	* libutil/find.c: The priority of the method of directory traverse
	  was reversed. If dirent(3) is available, then use it to traverse
	  directory tree. Otherwise use find(1).
	* configure.ac: --with-cflags=[=VAL] was removed.
	  Please use ./configure CFLAGS=VAL instead.
	* reconf.sh: --configure, --make and --install option added.

March 29 2003, Shigio YAMAGUCHI

	* C.c,Cpp.c: move some code into condition_macro.
	* C.h, Cpp.h, java.h: replace #define macro with enum member
	  for representing reserved words.
	* htags.in: add reserved words.
	* htags/manual.in: add description about configuration variable
	  'table_begin' and 'tabel_end'.
	* htags.in, manual.in: add configuration variables
	  'colorize_warned_line', 'warned_line_begin', 'warned_line_end'.
	* dbop.c: environment variable GTAGSCACHE added.

November 9 2002, Shigio YAMAGUCHI

	* gtags.c: --convert/--createdb/--readdb/--scandb option added.
	* btreeop: replaced with gtags and removed.
	* split.c: use SPLIT structure which manage sub-string.
	* gtagsop.c: now format version is 3 (pathindex format).
	* configure.ac: fixed for Autoconf-2.53 and renamed.
	* acconfig.h: removed because it is considered to be obsoleted.
	* gctags: inittable() added for each parser, which set up reserved
	  word table.
	* doc/*.texi: renamed from *.texi to *.txi for djgpp.
	* libutil: linetable.[ch] added.

July 4 2002, Shigio YAMAGUCHI

	* gctags.c: allows second argument in *ENTRY for 4.3BSD.
	* split.c: splitting function added.
	* strlimcpy.c: replaced strcpy() and strncpy() with strlimcpy().
	* strbuf.c: strbuf_putn() added.
	* conf.c find.c: shut buffer overflow.
	* gtags, htags: './' removed from path name in verbose message.
	* *.c, *.h: copyright year fixed.
	* configure.in: macro AG_BYTE_ORDER recovered.
	* htags: sort command replaced with gtags --sort in makedupindex()
	  so that sort can treat smaller number of tag lines.
	* htags: makedupindex() rewritten for performance.

March 30 2002, Shigio YAMAGUCHI

	* conf.c: added GPATH,GTAGS,GRTAGS,GSYMS,tags,TAGS,ID to DEFAULTSKIP.
	* find.c: decreased dependency on find(1).
	  removed length argument from find_read().
	* global.texi: documentation reconstructed.
	* globash.rc: --no-wait option added to emacsclient.
	* gozilla: gozilla directory added.
	* abs2rel.c: added for path conversion. pathfilter with sed(1)
	  is replaced gtags(1) --relative or --absolute.
	* global: use lid(1) rather than gid(1).
	* usable.c: locate command for BINDIR before PATH.
	* htags: bless.sh remove cgi-bin/global.cgi because it is not needed.
	* htags: changed open into 'open + exec' to avoid command substitutions
	  in pattern.

January 22 2002, Shigio YAMAGUCHI

	* htags: build trouble fixed.
	  global.cgi wasn't generated correctly.

January 10 2002, Shigio YAMAGUCHI

	* DJGPP support code added.
	  Jason Hood ported Global-4.0.1 into DJGPP environment.
	  I have merged his code into this version.
	* gtags.pl added.
	* Convert.pl added. From now on, usage, help, man, info are
	  generated automatically by this script from */manual.in files.
	* gtags, global: make exit code rule:
	  0:normal, 1:exception, 2:usage, 3:GTAGS not found.

November 23 2001, Shigio YAMAGUCHI

	* gtags: format char for strftime() changed (%e -> %d).
	* gtags: the path of gctags changed from 'gctags' to '$bindir/gctags'.
	* htags: use gtags --date and gtags --pwd instead of date and pwd.
	  Above changes are for Windows 32 environment.
	* rename file: pathop.[ch] -> gpathop.[ch].
	* rename functions: pathxxx -> gpath_xxx, gtagsxxx -> gtags_xxx.
	* rename functions: ffindxxx -> find_xxx, gfindxxx -> gfind_xxx.
	* libglibc/snprintf.c added.
	* move gfind_xxx from libutil/find.c to libutil/gpathop.c.

July 31 2001, Shigio YAMAGUCHI

	* VERSION: removed.
	* compat.h: moved to libdb/.
	* machine/: removed.
	* htags: WWW link in hypertext was modified.
	* gtags.c, global.c: rewrite code for putenv(3) using malloc(3).

July 12 2001, Shigio YAMAGUCHI

	* config variable HAVE_SNPRINTF and AC_FUNC_ALLOCA added.
	* stop using MAXENVLEN because it brings buffer overflow.
	* htags.pl: the value of id changed from src directory
	  to HTML directory.
	* libutil/conf.c: error check added.
	* libutil/gtagsop.c: replace notnamechar() with isregex().
	* put '#assert' into reserved word.
	* reconf.sh: command for generating configure added.
	* Copyright notice added for short files that are not important
	  enough to worry about copylefting.
	* libdb/db.h: typdefs pgno_t, indx_t and recno_t changed into macros.
	* gctags/{C.c,Cpp.c}: memory violation fixed.
	* libutil/getopt* and libregex/* moved to new libglibc/ directory.

September 26 2000, Shigio YAMAGUCHI

	* htags.pl: use generated path of perl for global.cgi.
	* global.1, htags.1, btreeop.1: fix missing .El.
	* make version number 'major.minor.fixed'.

September 3 2000, Shigio YAMAGUCHI

	* license changed from BSD-style to GPL.
	* now generated automatically by Automake and Autoconf.
	* nvi-1.79-gtags.diff: put into the public domain.
	* htags.pl: command path in global.cgi becomes generated
	  at execution time. usable() changed to return path.
	* htags.pl: optimized about temporary database.
	* htags.pl: most code which depend on javascript are removed
	  because most of browsers don't support the language.
	* mgets.c: now belongs strbuf.c as strbuf_fgets().
	* strbuf.c: new argument 'initial buffer size' of strbuf_open().
	* global.conf: one line script for ctags-exuberant fixed.
	* Cpp.h, java.h: MAXCLASSSTACK changed from 10 to 100.
	* use snprintf(3) instead of sprintf(3). 
	* replace Henry Spencer's regex(3) with GNU's one.
	* gctags/C.c: ignore 'extern' to treat 'extern func() { ...}'. 
	* global.c: use grep(1) if grep and xargs(1) are available.
	* global.c: use find(1) if find is available.
	* gtags.el: re-implement as a minor mode (gtags-mode) and
	  a major mode (gtags-select-mode) to work with other major mode
	  like c-mode.
	  prefix 'gtags-' added to all functions to avoid conflicts with
	  other packages..

December 23, 1999, Shigio YAMAGUCHI

	* htags.pl: change the process of removing cache file.
	* global.c, gtagsop.c, dbop.c: processing of regular expression
	  is moved from command level (global.c) to library level
	  (gtagsop.c) for optimizing -s option.
	* find.c: gfindopen(), gfindread(), gfindclose() added for
	  optimizing -g option.

November 3, 1999, Shigio YAMAGUCHI

	* htags: stop memory cache.
	* token.c: change buffer type from char to unsigned char.

September 17, 1999, Shigio YAMAGUCHI

	* compat.h: macro for solaris added.
	* Makefile.bsd: delete libregex.a target because BSD has it in libc.

August 29, 1999, Shigio YAMAGUCHI

	* gozilla: add DDE communication code in Windows 32.

August 26, 1999, Shigio YAMAGUCHI

	* Cygwin support code added.
	  David Aspinwall ported Global-3.44 into cygwin32 environment.
	  I referred his code but I didn't use it in as is style, because it
	  conflicted against Dan Fandrich's Windows 32 code. I wrote new
	  code for cygwin32 borrowing David's idea.
	  So any bugs in this area are therefore my fault, not David's.
	* htags: stop using cp(1).

August 23, 1999, Shigio YAMAGUCHI

	* Windows 32 support code added.
	  Dan Fandrich ported Global-3.44 into Windows 32 environment.
	  I have included his code into this version (3.5) and altered them
	  for some (mainly licensing) reasons, so any bugs in this area
	  are therefore my fault, not Dan's.
	* copyright notice of Tama Communications Corporation added.
	* Henry Spencer's regex(3) imported.
	* gtags.el: now detect XEmacs.
	* htags: rewrite header #!/usr/bin/perl -> #!/usr/bin/env perl
	* find.c: USEFIND undefined by default.

March 22, 1999, Shigio YAMAGUCHI

	* htags: internal path changed for ISO9660 file system.
	* htags: --action=url, --id=id and --nocgi options added to realize
	  Ron Lee's htmake. (internal use only - undocumented)
	* Makefile.generic: DESTDIR macro added.
	* db(3) 1.85 imported to keep machine independence in generic make.
	  'dbpatches' already has been applied.

January 20, 1999, Shigio YAMAGUCHI

	* wrong copyright notice fixed. (regents -> author)
	* gtags.el: stop auto execution of gtags-make-complete-list.
	* gtags: prohibit user from using a path including blanks.
	* gozilla: path conversion rule added.(It will be used in the future.)
	* htags: META TAG added to reject robots.

January 8, 1999, Shigio YAMAGUCHI

	* 'void main()' changed into 'int main()'.

December 10, 1998, Shigio YAMAGUCHI

	* rename db_XXX to dbop_XXX because some of them conflict against
	  functions in db-2.X.
	* nvi-1.79-m17n.diff: deleted because it is hard for me to maintain
	  it. Sorry.

November 8, 1998, Shigio YAMAGUCHI

	* global: --filter option added. (internal use only - undocumented)
	* htags: tabs parameter added in global.conf to change tab stop.
	* Makefile.generic: make sub makefiles inherit the macros from
	  the root Makefile.

September 13, 1998, Shigio YAMAGUCHI

	* Makefile: library name changed from libutil.a to libgloutil.a
	  because that conflicts against other library.
	* gctags: rewritten completely.
	  Thanks to Ken Arnold and the other people who developed BSD ctags(1).
	  Without it, GLOBAL had never been here.

August 31, 1998, Shigio YAMAGUCHI

	* nvi-1.79-m17n.diff: patch for multilingual nvi added.
	* nvi-1.66.diff: patch for nvi-1.66 added.
	* nvi-1.34.diff: deleted because it is old enough to support.
	* gozilla/Imakefile: make it possible to build gozilla alone without
	  building libgloutil.a.

August 4, 1998, Shigio YAMAGUCHI

	* gtags: --find option and --expand option added.
	  (internal use only - undocumented)
	* global.conf, lib/conf.c: 'CVS/' added to 'skip' parameter.
	* gtags.conf: 'reserved_words' variable for htags(1) deleted.
	  It is now hard coded.
	* find.c: dirent version added.

July 5, 1998, Shigio YAMAGUCHI

	* fixed warning by -Wall -Wmissing-prototypes.

June 25, 1998, Shigio YAMAGUCHI

	* gctags, gtags: -c option moved from gctags to gtags.
	  (It is needed for supporting plugged-in parser.)
	* htags: URL of GLOBAL home page changed.
	* gtags.c: replace "%+" of strftime with "%a %b %e %H:%M:%S %Z %Y".
	  for Debian GNU linux 1.3.1.

January 13, 1998, Shigio YAMAGUCHI

	* gctags/Makefile, gctags/Makefile.generic, gctags/ctags.h:
	  definitions of GLOBAL and YACC moved from Makefile to ctags.h.

December 11, 1997, Shigio YAMAGUCHI

	* lib/Makefile.generic:
	  change MANDIR definition from /usr/share/man to /usr/man.
	  replace `lorder $(OBJS) | tsort -q` to already sorted list
	  for S.u.S.E Linux 5.1.
	* gtags, lib/test.c: a few changes for Solaris environment.
	* htags/Makefile, systags/Makefile:
	  rewrite ${DESTDIR}/usr/bin to ${DESTDIR}${BINDIR}.

December 7, 1997, Shigio YAMAGUCHI

	* global,gtags,gozilla: rewritten with C for performance.
	* htags: shape up anchor database.

November 7, 1997, Shigio YAMAGUCHI

	* Makefile.generic: a few change for Debian GNU/Linux.

September 20, 1997, Shigio YAMAGUCHI

	* gctags, btreeop: remove <err.h> for portability.
	* btreeop: 'detab() + fprintf' is replaced with 'detab_print()'.
	* gtags, htags, global: don't restrict PATH to '/bin:/usr/bin'
	  like version 1.9 and the former.
	* htags: shut a security hole.
	* all command: description of exit code in on-line manual fixed.
	* gozilla: support X-property communication to mozilla.
	  See http://home.netscape.com/newsref/std/x-remote.html.

July 7, 1997, Shigio YAMAGUCHI

	* htags: tuned for performance.
	* gtags, gctags: move some code for assembly source from gtags
	  to gctags.
	* gtags, htags, global: restrict PATH to '/bin:/usr/bin'.
	* nvi-1.76.diff: deleted because it is old enough.

April 21, 1997, Shigio YAMAGUCHI

	* gctags, btreeop: a few changes for SunOS 4.1.3.
	* global: 'format version record' implemented.
	  (It will be used in the future.)
	* htags: use temporary directory specified by TMPDIR environment
	  variable.
	* nvi-1.79.diff: added for nvi-1.79.

April 5, 1997, Shigio YAMAGUCHI

	* gctags, btreeop, Makefile: a few changed for Linux and Solaris.
	* htags: changed internal separator from '|' to ' ', because some OS
	  cannot treat '|' in a path.
	* gctags, htags: regard 'entry' as a reserved word.

February 17, 1997, Shigio YAMAGUCHI

	* htags: htags no longer makes frame.html. index.html includes frame.
	* htags: tuned for performance.

January 21, 1997, Shigio YAMAGUCHI

	* gctags: import ctags.c and apply ctags.diff for generic UNIX.
	* htags: cease using <BLOCKQUOTE> because lynx doesn't understand it.
	* global,htags: replace 'sort -u' with 'sort | uniq' for compatibility.
	* nvi-1.76.diff: added for nvi 1.76.

October 26, 1996, Shigio YAMAGUCHI

	* ctags.diff: now search all part of a yacc file for C functions.
	  (original only 3rd part)
	* ctags.diff: no longer consider a yacc rule to be an object.

June 7, 1996, Shigio YAMAGUCHI

	* use bsearch(3) for searching reserved words.

April 21, 1996, Shigio YAMAGUCHI

	* global.pl, gtags.sh, btreeop.c, ctags.diff, Makefile.
	* only support FreeBSD 2.0.5R, 2.1R and 2.1.5R.
