/*
 * Copyright (C) 1984-2002  Mark Nudelman
 *
 * You may distribute under the terms of either the GNU General Public
 * License or the Less License, as specified in the README file.
 *
 * For more information about less, or for information on how to 
 * contact the author, see the README file.
 */
/*
 * Copyright (c) 1997-2005  Kazushi (Jam) Marukawa
 * All rights of japanized routines are reserved.
 *
 * You may distribute under the terms of the Less License.
 */


/*
----------------------- CHANGE HISTORY --------------------------

       1/29/84	Allowed use on standard input
       2/1/84	Added E, N, P commands
       4/17/84	Added '=' command, 'stop' signal handling
       4/20/84	Added line folding
v2     4/27/84	Fixed '=' command to use BOTTOM_PLUS_ONE,
		instead of TOP, added 'p' & 'v' commands
v3     5/3/84	Added -m and -t options, '-' command
v4     5/3/84	Added LESS environment variable
v5     5/3/84	New comments, fixed '-' command slightly
v6     5/15/84	Added -Q, visual bell
v7     5/24/84	Fixed jump_back(n) bug: n should count real
		lines, not folded lines.  Also allow number on G command.
v8     5/30/84	Re-do -q and -Q commands
v9     9/25/84	Added "+<cmd>" argument
v10    10/10/84	Fixed bug in -b<n> argument processing
v11    10/18/84	Made error() ring bell if \n not entered.
-----------------------------------------------------------------
v12    2/13/85	Reorganized signal handling and made portable to 4.2bsd.
v13    2/16/85	Reword error message for '-' command.
v14    2/22/85	Added -bf and -bp variants of -b.
v15    2/25/85	Miscellaneous changes.
v16    3/13/85	Added -u flag for backspace processing.
v17    4/13/85	Added j and k commands, changed -t default.
v18    4/20/85	Rewrote signal handling code.
v19    5/2/85	Got rid of "verbose" eq_message().
		Made search() scroll in some cases.
v20    5/21/85	Fixed screen.c ioctls for System V.
v21    5/23/85	Fixed some first_cmd bugs.
v22    5/24/85	Added support for no RECOMP nor REGCMP.
v23    5/25/85	Miscellanous changes and prettying up.
		Posted to USENET.
-----------------------------------------------------------------
v24    6/3/85	Added ti,te terminal init & de-init.       
		(Thanks to Mike Kersenbrock)
v25    6/8/85	Added -U flag, standout mode underlining.
v26    6/9/85	Added -M flag.
		Use underline termcap (us) if it exists.
v27    6/15/85	Renamed some variables to make unique in
		6 chars.  Minor fix to -m.
v28    6/28/85	Fixed right margin bug.
v29    6/28/85	Incorporated M.Rose's changes to signal.c
v30    6/29/85	Fixed stupid bug in argument processing.
v31    7/15/85	Added -p flag, changed repaint algorithm.  
		Added kludge for magic cookie terminals.
v32    7/16/85	Added cat_file if output not a tty.
v33    7/23/85	Added -e flag and EDITOR.
v34    7/26/85	Added -s flag.
v35    7/27/85	Rewrote option handling; added option.c.
v36    7/29/85	Fixed -e flag to work if not last file.
v37    8/10/85	Added -x flag.
v38    8/19/85	Changed prompting; created prompt.c.
v39    8/24/85	(Not -p) does not initially clear screen.
v40    8/26/85	Added "skipping" indicator in forw().
		Posted to USENET.
-----------------------------------------------------------------
v41    9/17/85	ONLY_RETURN, control char commands,
		faster search, other minor fixes.
v42    9/25/85	Added ++ command line syntax;
		ch_fsize for pipes.
v43    10/15/85	Added -h flag, changed prim.c algorithms.
v44    10/16/85	Made END print in all cases of eof;
		ignore SIGTTOU after receiv ing SIGTSTP.
v45    10/16/85	Never print backspaces unless -u.
v46    10/24/85	Backwards scroll in jump_loc.
v47    10/30/85	Fixed bug in edit(): *first_cmd==0
v48    11/16/85	Use TIOCSETN instead of TIOCSETP.
		Added marks (m and ' commands).
		Posted to USENET.
-----------------------------------------------------------------
v49    1/9/86	Fixed bug: signal didn't clear mcc.
v50    1/15/86	Added ' (quote) to gomark.
v51    1/16/86	Added + cmd, fixed problem if first_cmd
		fails, made g cmd sort of "work" on pipes
		ev en if bof is no longer buffered.
v52    1/17/86	Made short files work better.
v53    1/20/86	Added -P option.
v54    1/20/86	Changed help to use HELPFILE.
v55    1/23/86	Messages work better if not tty output.
v56    1/24/86	Added -l option.
v57    1/31/86	Fixed -l to get confirmation before
		ov erwriting an existing file.
v58    8/28/86	Added filename globbing.
v59    9/15/86	Fixed some bugs with very long filenames.
v60    9/26/86	Incorporated changes from Leith (Casey)
		Leedom for boldface and -z option.
v61    9/26/86	Got rid of annoying repaints after ! cmd.
		Posted to USENET.
-----------------------------------------------------------------
v62    12/23/86	Added is_directory(); change -z default to
		-1 instead of 24; cat-and-exit if -e and
		file is less than a screenful.
v63    1/8/87	Fixed bug in cat-and-exit if > 1 file.
v64    1/12/87	Changed puts/putstr, putc/putchr,
		getc/getchr to av oid name conflict with
		stdio functions.
v65    1/26/87	Allowed '-' command to change NUMBER
		v alued options (thanks to Gary Puckering)
v66    2/13/87	Fixed bug: prepaint should use force=1.
v67    2/24/87	Added !! and % expansion to ! command.
v68    2/25/87	Added SIGWINCH and TIOCGWINSZ support;
		changed is_directory to bad_file.
		(thanks to J. Robert Ward)
v69    2/25/87	Added SIGWIND and WIOCGETD (for Unix PC).
v70    3/13/87	Changed help cmd from 'h' to 'H'; better
		error msgs in bad_file, errno_message.
v71    5/11/87	Changed -p to -c, made triple -c/-C
		for clear-eol like more's -c.
v72    6/26/87	Added -E, -L, use $SHELL in lsystem().
		(thanks to Stev e Spearman)
v73    6/26/87	Allow Examine "#" for previous file.
		Posted to USENET 8/25/87.
-----------------------------------------------------------------
v74    9/18/87	Fix conflict in EOF symbol with stdio.h,
		Make os.c more portable to BSD.
v75    9/23/87	Fix problems in get_term (thanks to 
		Paul Eggert); new backwards scrolling in
		jump_loc (thanks to Marion Hakanson).
v76    9/23/87	Added -i flag; allow single "!" to
		inv oke a shell (thanks to Franco Barber).
v77    9/24/87	Added -n flag and line number support.
v78    9/25/87	Fixed problem with prompts longer than
		the screen width.
v79    9/29/87	Added the _ command.
v80    10/6/87	Allow signal to break out of linenum scan.
v81    10/6/87	Allow -b to be changed from within less.
v82    10/7/87	Add cmd_decode to use a table for key
		binding (thanks to Dav id Nason).
v83    10/9/87	Allow .less file for user-defined keys.
v84    10/11/87	Fix -e/-E problems (thanks to Felix Lee).
v85    10/15/87	Search now keeps track of line numbers.
v86    10/20/87	Added -B option and autobuf; fixed
		"pipe error" bug.
v87    3/1/88	Fix bug re BSD signals while reading file.
v88    3/12/88	Use new format for -P option (thanks to
		der Mouse), allow "+-c" without message,
		fix bug re BSD hangup.
v89    3/18/88	Turn off line numbers if linenum scan
		is interrupted.
v90    3/30/88	Allow -P from within less.
v91    3/30/88	Added tags file support (new -t option)
		(thanks to Brian Campbell).
v92    4/4/88	Added -+option syntax.
v93    4/11/88	Add support for slow input (thanks to
		Joe Orost & apologies for taking almost
		3 years to get this in!)
v94    4/11/88	Redo reading/signal stuff.
v95    4/20/88	Repaint screen better after signal.
v96    4/21/88	Add /! and ?! commands.
v97    5/17/88	Allow -l/-L from within less.
		Eliminate some static arrays (use calloc).
		Posted to USENET.
-----------------------------------------------------------------
v98    10/14/88	Fix incorrect calloc call; uninitialized
		var in exec_mca; core dump on unknown TERM.
		Make v cmd work if past last line of file.
		Fix some signal bugs.
v99    10/29/88	Allow space between -X and string,
		when X is a string-valued option.
v100   1/5/89	Fix globbing bug when $SHELL not set;
		allow spaces after -t command.
v101   1/6/89	Fix problem with long (truncated) lines
		in tags file (thanks to Neil Dixon).
v102   1/6/89	Fix bug with E# when no prev file;
		allow spaces after -l command.
v103   3/14/89	Add -N, -f and -? options.  Add z and w
		commands.  Add %L for prompt strings.
v104   3/16/89	Added EDITPROTO.
v105   3/20/89	Fix bug in find_linenum which cached
		incorrectly on long lines.
v106   3/31/89	Added -k option and multiple lesskey      
		files.
v107   4/27/89	Add 8-bit char support and -g option.
		Split option code into 3 files.
v108   5/5/89	Allocate position table dynamically       
		(thanks to Paul Eggert); change % command
		from "percent" to vi-style brace finder.
v109   5/10/89	Added ESC-% command, split prim.c.
v110   5/24/89	Fixed bug in + option; fixed repaint bug
		under Sun windows (thanks to Paul Eggert).
v111   5/25/89	Generalized # and % expansion; use 
		calloc for some error messages.
v112   5/30/89	Get rid of ESC-%, add {}()[] commands.
v113   5/31/89	Optimize lseeks (thanks to Paul Eggert).
v114   7/25/89	Added ESC-/ and ESC-/! commands.
v115   7/26/89	Added ESC-n command.
v116   7/31/89	Added find_pos to optimize g command.
v117   8/1/89	Change -f option to -r.
v118   8/2/89	Save positions for all previous files,
		not just the immediately previous one.
v119   8/7/89	Save marks across file boundaries.
		Add file handle stuff.
v120   8/11/89	Add :ta command.
v121   8/16/89	Add -f option.
v122   8/30/89	Fix performance with many buffers.
v123   8/31/89	Verbose prompts for string options.
		Posted beta to USENET.
-----------------------------------------------------------------
v124   9/18/89	Reorganize search commands,
		N = rev, ESC-n = span, add ESC-N.
v125   9/18/89	Fix tab bug (thanks to Alex Liu).
		Fix EOF bug when both -w and -c.
v126   10/25/89	Add -j option.
v127   10/27/89	Fix problems with blank lines before BOF.
v128   10/27/89	Add %bj, etc. to prompt strings.
v129   11/3/89	Add -+,-- commands; add set-option and
		unset-option to lesskey.
v130   11/6/89	Generalize A_EXTRA to string, remove
		set-option, unset-option from lesskey.
v131   11/7/89	Changed name of EDITPROTO to LESSEDIT.
v132   11/8/89	Allow editing of command prefix.
v133   11/16/89	Add -y option (thanks to Jeff Sullivan).
v134   12/1/89	Glob filenames in the -l command.
v135   12/5/89	Combined {}()[] commands into one, and
		added ESC-^F and ESC-^B commands.
v136   1/20/90	Added -S, -R flags.  Added | command.
		Added warning for binary files. (thanks
		to Richard Brittain and J. Sullivan).
v137   1/21/90	Rewrote horrible pappend code.
		Added * notation for hi-bit chars.
v138   1/24/90	Fix magic cookie terminal handling.
		Get rid of "cleanup" loop in ch_get.
v139   1/27/90	Added MSDOS support.  (many thanks
		to Richard Brittain).
v140   2/7/90	Editing a new file adds it to the
		command line list.
v141   2/8/90	Add edit_list for editing >1 file.
v142   2/10/90	Add :x command.
v143   2/11/90	Add * and @ modifies to search cmds.
		Change ESC-/ cmd from /@* to / *.
v144   3/1/90	Messed around with ch_zero; 
		no real change.
v145   3/2/90	Added -R and -v/-V for MSDOS;
		renamed FILENAME to avoid conflict.
v146   3/5/90	Pull cmdbuf functions out of command.c
v147   3/7/90	Implement ?@; fix multi-file edit bugs.
v148   3/29/90	Fixed bug in :e<file> then :e#.
v149   4/3/90	Change error,ierror,query to use PARG.
v150   4/6/90	Add LESS_CHARSET, LESS_CHARDEF.
v151   4/13/90	Remove -g option; clean up ispipe.
v152   4/14/90	lsystem() closes input file, for
		editors which require exclusive open.
v153   4/18/90	Fix bug if SHELL unset; 
		fix bug in overstrike control char.
v154   4/25/90	Output to fd 2 via buffer.
v155   4/30/90	Ignore -i if uppercase in pattern
		(thanks to Michael Rendell.)
v156   5/3/90	Remove scroll limits in forw() & back();
		causes problems with -c.
v157   5/4/90	Forward search starts at next real line
		(not screen line) after jump target.
v158   6/14/90	Added F command.
v159   7/29/90	Fix bug in exiting: output not flushed.
v160   7/29/90	Clear screen before initial output w/ -c.
v161   7/29/90	Add -T flag.
v162   8/14/90	Fix bug with +F on command line.
v163   8/21/90	Added LESSBINFMT variable.
v164   9/5/90	Added -p, LINES, COLUMNS and
		unset mark ' == BOF, for 1003.2 D5.
v165   9/6/90	At EOF with -c set, don't display empty
		screen when try to page forward.
v166   9/6/90	Fix G when final line in file wraps.
v167   9/11/90	Translate CR/LF -> LF for 1003.2.
v168   9/13/90	Return to curr file if "tag not found".
v169   12/12/90	G goes to EOF even if file has grown.
v170   1/17/91	Add optimization for BSD _setjmp;
		fix #include ioctl.h TERMIO problem.
		(thanks to Paul Eggert)
		Posted to USENET.
-----------------------------------------------------------------
v171   3/6/91	Fix -? bug in get_filename.
v172   3/15/91	Fix G bug in empty file.
		Fix bug with ?\n and -i and uppercase
		pattern at EOF!
		(thanks to Paul Eggert)
v173   3/17/91	Change N cmd to not permanently change
		direction. (thanks to Brian Matthews)
v174   3/18/91	Fix bug with namelogfile not getting
		cleared when change files.
v175   3/18/91	Fix bug with ++cmd on command line.
		(thanks to Jim Meyering)
v176   4/2/91	Change | to not force current screen,
		include marked line, start/end from
		top of screen.  Improve search speed.
		(thanks to Don Mears)
v177   4/2/91	Add LESSHELP variable.
		Fix bug with F command with -e.
		Try /dev/tty for input before using fd 2.
		Patches posted to USENET  4/2/91.
-----------------------------------------------------------------
v178   4/8/91	Fixed bug in globbing logfile name.
		(thanks to Jim Meyering)
v179   4/9/91	Allow negative -z for screen-relative.
v180   4/9/91	Clear to eos rather than eol if "db";
		don't use "sr" if "da".
		(thanks to Tor Lillqvist)
v181   4/18/91	Fixed bug with "negative" chars 80 - FF.
		(thanks to Benny Sander Hofmann)
v182   5/16/91	Fixed bug with attribute at EOL.
		(thanks to Brian Matthews)
v183   6/1/91	Rewrite linstall to do smart config.
v184   7/11/91	Process \b in searches based on -u
		rather than -i.
v185   7/11/91	-Pxxx sets short prompt; assume SIGWINCH
		after a SIGSTOP. (thanks to Ken Laprade)
-----------------------------------------------------------------
v186   4/20/92	Port to MS-DOS (Microsoft C).
v187   4/23/92	Added -D option & TAB_COMPLETE_FILENAME.
v188   4/28/92	Added command line editing features.
v189   12/8/92	Fix mem overrun in anscreen.c:init; 
		fix edit_list to recover from bin file.
v190   2/13/93	Make TAB enter one filename at a time;
		create ^L with old TAB functionality.
v191   3/10/93	Defer creating "flash" page for MS-DOS.
v192   9/6/93	Add BACK-TAB.
v193   9/17/93	Simplify binary_file handling.
v194   1/4/94	Add rudiments of alt_filename handling.
v195   1/11/94	Port back to Unix; support keypad.
-----------------------------------------------------------------
v196   6/7/94	Fix bug with bad filename; fix IFILE
		type problem. (thanks to David MacKenzie)
v197   6/7/94	Fix bug with .less tables inserted wrong.
v198   6/23/94	Use autoconf installation technology.
		(thanks to David MacKenzie)
v199   6/29/94	Fix MS-DOS build (thanks to Tim Wiegman).
v200   7/25/94	Clean up copyright, minor fixes.
	Posted to prep.ai.mit.edu
-----------------------------------------------------------------
v201   7/27/94	Check for no memcpy; add casts to calloc;
		look for regcmp in libgen.a.
		(thanks to Kaveh Ghazi).
v202   7/28/94	Fix bug in edit_next/edit_prev with 
		non-existant files.
v203   8/2/94	Fix a variety of configuration bugs on
		various systems. (thanks to Sakai
		Kiyotaka, Harald Koenig, Bjorn Brox,
		Teemu Rantanen, and Thorsten Lockert)
v204   8/3/94	Use strerror if available.
		(thanks to J.T. Conklin)
v205   8/5/94	Fix bug in finding "me" termcap entry.
		(thanks to Andreas Stolcke)
8/10/94 	v205+: Change BUFSIZ to LBUFSIZE to avoid name
		conflict with stdio.h.
		Posted to prep.ai.mit.edu
-----------------------------------------------------------------
v206   8/10/94	Use initial_scrpos for -t to avoid
		displaying first page before init().
		(thanks to Dominique Petitpierre)
v207   8/12/94	Fix bug if stdout is not tty.
v208   8/16/94	Fix bug in close_altfile if goto err1
		in edit_ifile. (Thanks to M.J. Hewitt)
v209   8/16/94	Change scroll to wscroll to avoid 
		conflict with library function.
v210   8/16/94	Fix bug with bold on 8 bit chars.
		(thanks to Vitor Duarte)
v211   8/16/94	Don't quit on EOI in jump_loc / forw.
v212   8/18/94	Use time_t if available.
v213   8/20/94	Allow ospeed to be defined in termcap.h.
v214   8/20/94	Added HILITE_SEARCH, -F, ESC-u cmd.
		(thanks to Paul Lew and Bob Byrnes)
v215   8/23/94	Fix -i toggle behavior.
v216   8/23/94	Process BS in all searches, not only -u.
v217   8/24/94	Added -X flag.
v218   8/24/94	Reimplement undo_search.
v219   8/24/94	Find tags marked with line number
		instead of pattern.
v220   8/24/94	Stay at same position after SIG_WINCH.
v221   8/24/94	Fix bug in file percentage in big file.
v222   8/25/94	Do better if can't reopen current file.
v223   8/27/94	Support setlocale.
		(thanks to Robert Joop)
v224   8/29/94	Revert v216: process BS in search
		only if -u.
v225   9/6/94	Rewrite undo_search again: toggle.
v226   9/15/94	Configuration fixes. 
		(thanks to David MacKenzie)
v227   9/19/94	Fixed strerror config problem.
		Posted to prep.ai.mit.edu
-----------------------------------------------------------------
v228   9/21/94	Fix bug in signals: repeated calls to
		get_editkeys overflowed st_edittable.
v229   9/21/94	Fix "Nothing to search" error if -a
		and SRCH_PAST_EOF.
v230   9/21/94	Don't print extra error msg in search
		after regerror().
v231   9/22/94	Fix hilite bug if search matches 0 chars.
		(thanks to John Polstra)
v232   9/23/94	Deal with weird systems that have 
		termios.h but not tcgetattr().
		Posted to prep.ai.mit.edu
-----------------------------------------------------------------
v233   9/26/94	Use get_term() instead of pos_init() in
		psignals to re-get lower_left termcap.
		(Thanks to John Malecki)
v234   9/26/94	Make MIDDLE closer to middle of screen.
v235   9/27/94	Use local strchr if system doesn't have.
v236   9/28/94	Don't use libucb; use libterm if 
		libtermcap & libcurses doesn't work.
		(Fix for Solaris; thanks to Frank Kaefer)
v237   9/30/94	Use system isupper() etc if provided.
		Posted to prep.ai.mit.edu
-----------------------------------------------------------------
v238   10/6/94	Make binary non-blinking if LESSBINFMT
		is set to a string without a *.
v239   10/7/94	Don't let delimit_word run back past
		beginning of cmdbuf.
v240   10/10/94	Don't write into termcap buffer.
		(Thanks to Benoit Speckel)
v241   10/13/94	New lesskey file format.
		Don't expand filenames in search command.
v242   10/14/94	Allow lesskey specification of "literal".
v243   10/14/94	Add #stop command to lesskey.
v244   10/16/94	Add -f flag to lesskey.
v245   10/25/94	Allow TAB_COMPLETE_FILENAME to be undefd.
v246   10/27/94	Move help file to /usr/local/share.
v247   10/27/94	Add -V option.
v248   11/5/94	Add -V option to lesskey.
v249   11/5/94	Remove -f flag from lesskey; default
		input file is ~/.lesskey.in, not stdin.
v250   11/7/94	Lesskey input file "-" means stdin.
v251   11/9/94	Convert cfgetospeed result to ospeed.
		(Thanks to Andrew Chernov)
v252   11/16/94	Change default lesskey input file from 
		.lesskey.in to .lesskey.
		Posted to prep.ai.mit.edu
-----------------------------------------------------------------
v253   11/21/94	Fix bug when tags file has a backslash.
v254   12/6/94	Fix -k option.
v255   12/8/94	Add #define EXAMINE to disable :e etc.
v256   12/10/94	Change highlighting: only highlite search
		results (but now it is reliable).
v257   12/10/94	Add goto_line and repaint_highlight
		to optimize highlight repaints.
v258   12/12/94	Fixup in hilite_line if BS_SPECIAL.
v259   12/12/94	Convert to autoconf 2.0.
v260   12/13/94	Add SECURE define.
v261   12/14/94	Use system WERASE char as EC_W_BACKSPACE.
v262   12/16/94	Add -g/-G flag and screen_hilite.
v263   12/20/94	Reimplement/optimize -G flag behavior.
v264   12/23/94	Allow EXTRA string after line-edit cmd
		in lesskey file.
v265   12/24/94	Add LESSOPEN=|cmd syntax.
v266   12/26/94	Add -I flag.
v267   12/28/94	Formalize the four-byte header emitted
		by a LESSOPEN pipe.
v268   12/28/94	Get rid of four-byte header.
v269   1/2/95	Close alt file before open new one.
		Avoids multiple popen().
v270   1/3/95	Use VISUAL; use S_ISDIR/S_ISREG; fix
		config problem with Solaris POSIX regcomp.
v271   1/4/95	Don't quit on read error.
v272   1/5/95	Get rid of -L.
v273   1/6/95	Fix ch_ungetchar bug; don't call
		LESSOPEN on a pipe.
v274   1/6/95	Ported to OS/2 (thanks to Kai Uwe Rommel)
v275   1/18/95	Fix bug if toggle -G at EOF.
v276   1/30/95	Fix OS/2 version.
v277   1/31/95	Add "next" charset; don't display ^X 
		for X > 128.
v278   2/14/95	Change default for -G.
		Posted to prep.ai.mit.edu
-----------------------------------------------------------------
v279   2/22/95	Add GNU options --help, --version.
		Minor config fixes.
v280   2/24/95	Clean up calls to glob(); don't set #
		if we can't open the new file.
v281   2/24/95	Repeat search should turn on hilites.
v282   3/2/95	Minor fixes.
v283   3/2/95	Fix homefile; make OS2 look in $HOME.
v284   3/2/95	Error if "v" on LESSOPENed file;
		"%" figures out file size on pipe.
v285   3/7/95	Don't set # in lsystem; 
		lesskey try $HOME first.
v286   3/7/95	Reformat change history (too much free time?).
v287   3/8/95	Fix hilite bug if overstrike multiple chars.
v288   3/8/95	Allow lesskey to override get_editkey keys.
v289   3/9/95	Fix adj_hilite bug when line gets processed by
		hilite_line more than once.
v290   3/9/95	Make configure automatically.  Fix Sequent problem
		with incompatible sigsetmask().
		Posted to prep.ai.mit.edu
-----------------------------------------------------------------
v291   3/21/95	Add #env to lesskey.  Fix MS-DOS build.
		Posted to simtel.
-----------------------------------------------------------------
v292   4/24/95	Add MS-DOS support for Borland C.
		Fix arrow keys in MS-DOS versions.
v293   4/28/95	Add auto-versioning stuff to make dist.
v294   5/12/95	Fix Borland build.
v295   1/20/96	Fix search on squished file; add /@@.
v296   1/23/96	Allow cmdbuf larger than screen width.
v297   1/24/96	Don't call termcap if tgetent fails; 
		add #defines for buffers.
v298   1/24/96	Change @@ to ^K.  
		Add alternate search modifiers ^N, ^F, ^E.
v299   1/25/96	Fix percent overflow in jump_percent (thanks to Brent Wiese);
		don't send "ti" after shell command till RETURN pressed.
v300   1/25/96	Change -U to print tabs as ^I.
v301   1/30/96	Make hilites work in cmd F output.
v302   1/31/96	Fix cmd F to notice window-change signals.
v303   1/31/96	Add ESC-SPACE command.
v304   2/1/96	Add ^R search modifier; add LESSSECURE.
v305   2/2/96	Workaround Linux /proc kernel bug; add LESSKEY.
v306   3/16/96	Minor fixes.
v307   3/25/96	Allow cmd line arg "--"; fix DOS & OS/2 defines.h.
v308   4/4/96	Port to OS-9 (thanks to Boisy Pitre); fix -d.
v309   4/9/96	Fix OS-9 version; fix tags bug with "$".
v310   4/10/96	Get rid of HELPFILE.
v311   4/22/96	Add Windows32 support; merge doscreen.c into screen.c.
v312   4/24/96	Don't quit after "cannot reopen" error.
v313   4/25/96	Added horizontal scrolling.
v314   4/26/96	Modified -e to quit on reaching end of a squished file.
v315   4/26/96	Fix "!;TAB" bug.
v316   5/2/96	Make "|a" when (a < curr screen) go to end of curr screen.
v317   5/14/96	Various fixes for the MS-DOS and OS/2 builds.
		Added ## and %% handling for filenames
v318   5/29/96	Port to OS-9 Microware compiler; minor fixes 
		(thanks to Martin Gregorie).
v319   7/8/96	Fix Windows port (thanks to Jeff Paquette).
v320   7/11/96	Final fixes for Windows port.
v321   7/18/96	Minor fixes.
		Posted to Web page.
-----------------------------------------------------------------
v322   8/13/96	Fix bug in shell escape from help file; add support for 
		Microsoft Visual C under Windows; numerous small fixes.
v323   8/19/96	Fixes for Windows version (thanks to Simon Munton);
		fix for Linux library weirdness (thanks to Jim Diamond);
		port to DJGPP (thanks to Eli Zaretskii).
v324   8/21/96	Add support for spaces in filenames (thanks to Simon Munton).
v325   8/21/96	Add lessecho, for spaces in filenames under Unix.
v326   8/27/96	Fix DJGPP version.
v327   9/1/96	Reorganize lglob, make spaces in filenames work better in Unix.
v328   10/7/96	Append / to directory name in filename completion.
		Fix MS-DOS and OS-9 versions.
v329   10/11/96	Fix more MS-DOS bugs; add LESSSEPARATOR; add -" option.
		Add LESSMETACHARS, LESSMETAESCAPE.
v330   10/21/96	Minor fixes.
		Posted to Web page.
-----------------------------------------------------------------
v331   4/22/97	Various Windows fixes (thanks to Gurusamy Sarathy).
v332   4/22/97	Enter filenames from cmd line into edit history.
		Posted to Web page.
-----------------------------------------------------------------
v333    3/4/99	Changed -w to highlite new line after forward movement.
v334    3/9/99	Avoid overflowing prompt buffer; add %d and %D.
v335   3/20/99	Add EBCDIC support (thanks to Thomas Dorner).
              	Use HOMEDRIVE/HOMEPATH on Windows (thanks to Preston Bannister).
		Posted to Web page.
-----------------------------------------------------------------
v336    4/8/99	Fix installation bugs.
v337    4/9/99	Fix another installation bug.
		Posted to Web page.
-----------------------------------------------------------------
v338   4/13/99	Add support for long option names.
v339   4/18/99	Add \k, long option names to lesskey.  Add -^P.  Add :d.
v340   4/21/99	Add regexec2.  Fix Windows build.
		Posted to Web page.
-----------------------------------------------------------------
v341    5/6/99  Add -F option; %c & ?c prompt escapes.
		(Thanks to Michele Maltoni)
v342   7/22/99  Add system-wide lesskey file; allow GPL or Less License.
v343   9/23/99	Support UTF-8 (Thanks to Robert Brady).
		Add %P and ?P in prompts.
v344  10/27/99	-w highlights target line of g and p commands.
v345  10/29/99	Make -R pass thru ESC but not other control chars.
		Posted to Web page.
-----------------------------------------------------------------
v346   11/4/99  Fix bugs in long option processing; R cmd should clear hilites.
		Posted to Web page.
-----------------------------------------------------------------
v347  12/13/99	Fixes for DJGPP version (thanks to Eli Zaretskii).
v348  12/28/99	Fix deleting file with marks (thanks to Dimitar Jekov).
		Fix color problem in DJGPP version (thanks to Eli Zaretskii).
v349   1/24/00	Fix minor DJGPP bugs; check environment vars for UTF-8;
		add --with-editor (thanks to Eli, Markus Kuhn, Thomas Schoepf).
v350   3/1/00	Fix clear-while-standout bug.
v351   3/5/00	Change -M and = prompts to show top & bottom line number.
		Posted to Web page.
-----------------------------------------------------------------
v352   3/8/00	Fix scan_option NULL dereference.
-----------------------------------------------------------------
v353   3/20/00	Fix SECURE compile bug, allow space after numeric option.
v354   3/23/00	Add support for PCRE; add --with-regex configure option.
-----------------------------------------------------------------
v355   6/28/00	Add -# option (thanks to Andy Levinson).
v356   7/5/00	Add -J option.
v357   7/6/00	Support sigprocmask.
-----------------------------------------------------------------
v358   7/8/00	Fix problems with #stop in lesskey file.
		Posted to Web page.
-----------------------------------------------------------------
v359  9/10/00	Fixes for Win32 display problems (thanks to Maurizio Vairani).
v360  1/17/01	Move sysless to etc.
v361  12/4/01	Add IBM-1047 charset & EBCDIC fixes (thanks to Thomas Dorner).
		Fix 32 bit dependencies (thanks to Paul Eggert).
		Fix UTF-8 overstriking (thanks to Robert Brady).
v362  12/4/01	Make status column show search targets.
v363  12/6/01	Add --no-keypad option.
		Add variable width tabstops (thanks to Peter Samuelson).
v364 12/10/01	Better handling of very long lines in input;
		Fix horizontal shifting of colored text.
v365 12/11/01	Fix overstriking of tabs;
		Add support for global(1) and multiple tag matches
		(thanks to Shigio Yamaguchi and Tim Vanderhoek).
v366 12/11/01	Fixes for OS/2 (thanks to Kyosuke Tokoro).
v367 12/13/01	Allow -D and -x options to terminate without dollar sign;
		Right/left arrow when entering N are shift cmds, not line edit.
v368 12/18/01	Update lesskey commands.
v370 12/23/01	Fix tags error messages.
		Posted to Web page.
-----------------------------------------------------------------
v371 12/26/01	Fix new_file bug; use popen in Windows version;
		fix some compiler warnings.
v372 12/29/01	Make -b be in units of 1K.
v373  1/14/02	Improve handling of filenames containing shell metachars.
v374   2/7/02	Fix memory leak; fix bug in -x argument parsing.
v375   4/7/02	Fix searching for SGR sequences; fix SECURE build;
		add SGR support to DJGPP version (thanks to Eli Zaretskii).
v376  6/10/02	Fix bug in overstriking mulitbyte UTF-8 characters
		(thanks to Jungshik Shin).
		Posted to Web page.
-----------------------------------------------------------------
v377  9/10/02	Fix bug in Windows version when file contains CR;
		fix bug in search highlights with -R;
		make initial buffer limit really be 64K not unlimited.
v378  9/30/02	Misc bug fixes and compiler warning cleanup.
		Posted to Web page.
-----------------------------------------------------------------
v379 11/23/02	Add -L option; fix bug with ctrl-K in lesskey files;
		improve UTF-8 overstriking and underscore overstriking;
		fix minor man page problems; change to autoconf 2.54.
v380 11/24/02	Make LINENUM same as POSITION.
v381 11/28/02	Make -N use 7 columns for line number if possible.
-----------------------------------------------------------------
v382   2/3/04	Remove copyrighted code.

-----------------------------------------------------------------
   Other patches by jam@pobox.com
kanji  7/18/91	Support Kanji as one of the charset.
zcat   4/21/94	Add easy uncompressing feature by invoking zcat.
iso    8/11/94	Support ISO2022 encoding and special Japanese KANJI encodings
		as one of the charset.
iso2   9/21/94	Fix a variety of bugs of iso patch.
iso2p1 10/22/94	Fix a variety of bugs.
iso202 12/1/96	Chang to fit less version 330 and fixed some bugs.
iso203 12/5/96	Fix line termination bug.
iso204 12/15/96	Change all internal data structure.  Add CHARSET and
		"CHARSET charset[]" in line.c.
iso205 12/16/96	Add CODESET and structure of CODESET in multi.c and
		made buffering_multi() recursively.
iso206 12/21/96	Support multi bytes characters in command buffer.
		And add rotate-right command for rotating the code set in the
		right plane.
iso207 12/22/96	Support search of multi bytes characters.
iso208 12/23/96	Encapsulate multi bytes buffering data.  And change
		the structure of CHARSET.
iso209 1/5/97	Fix bugs of KANJI search and sophisticate SJIS routines.
iso210 1/12/97	Fix BS handling and add priority argument of KANJI code.
iso211 1/19/97	Add and change comments.
iso212 1/21/97	Fix a bug about UJIS_REGEXP search.
iso213 1/22/97	Fix a bug about 8-bit error message.
iso214 1/24/97	Fix a bug about handling of BS character.
iso215 1/25/97	Change to invert -Z option if SJIS_PRE is defined
iso216 3/9/97	Fix a bug about buffering of KANJI supplement.
iso217 4/13/97	Fix a bug about initialization of priority table.
iso218 4/13/97	Change search routines to check the CHARSET at any time.
iso219 5/5/97	Fix a typo and some codes which are warned.
iso220 5/5/97	Changed the name of UJIS_REGEXP macro to EIGHTBIT_REGEXP.
iso221 5/6/97	Changed to use USE_CHARSET macro well.
iso222 12/2/97	Support private character sets and empty character set.
iso223 12/8/97	Fix some typos and warnings.
iso224 12/10/97	Fix a converting bug about WRONGCS.
iso225 2/8/98	Use appropriate matching when looking for a charset.
iso226 2/9/98	Add -K option to choose CHARSET easy.
iso227 2/15/98	Fix some bugs in code conversion routines.
iso228 2/16/98	Change to ignore all user defined characters in SJIS and UJIS.
iso229 3/5/98	Display blank characters instead of delete them when a part of
		a multi column character needed to display.
iso230 3/6/98	Support regular expression library with character set ability.
iso231 3/7/98	Fixed typo.
iso232 3/8/98	Change a configure script.
iso233 3/10/98	Fixed typo and made multi.h.
iso234 3/12/98	Removed prewind_multi and pdone_multi because it depend on
		less.  Add init_multi and clear_multi instead of them.
iso235 3/13/98	Add unify.c for chcmp_cs function.
iso236 3/14/98	Fixed MSB_ENABLE bugs.
iso237 3/16/98	Add unification among JIS X 0208, ASCII, Cyrillic and Greek.
iso238 3/17/98	Add NULLCS to represent a terminator.
		Changed a character set for control characters to WRONGCS.
		Add chunify_cs and chconvert_cs as external function.
iso239 3/20/98	Fixed a bug in match() and add assertion in chunify_cs().
iso240 3/25/98	Corrected all cmdbuf and cmdcs buffers' handling.
		Fixed a control character handling bug.
		Changed to remove padded codes from search pattern.
iso241 4/2/98	Fixed small bugs in search.c.
iso242 5/18/98	Fixed a buffering problem of search.
iso243 7/1/98	Add elimination of wrong characters for JIS C 6226-1978,
		JIS X 0208-1983 and JIS X 0208:1990/1997.
iso244 7/2/98	Add elimination of wrong characters for SJIS and UJIS.
iso245 7/2/98	Fix a bug about elimination for SJIS.
iso246 8/8/98	Add one locale for Win32, eliminate all MSB_ENABLE stuff
		from unify.c, and fix eliminating table for JIS C 6226-1978.
iso247 8/8/98	Add -W option.  And change the point of putting a mark.  Now
		multi.c call checking function, then mark wrong characters.
iso248 8/12/98	Fix a problem of outputting WRONGCS.  Add checking table
		for JIS X 0212:1990.
iso249 10/29/00	Joined with less-358.  Fixed some bugs caused by join.
iso250 11/21/00	Support JIS X 0213:2000.  Added support of cygwin.
		Thanks to nayuta-san.
iso251 11/22/00	Support SJIS and UJIS using JIS X 0213:2000.
iso252 11/24/00	Fixed a problem to output JIS X 0212:1990 using jis style.
iso253 12/2/00	Fixed a problem to output SJIS.  Thanks to nayuta-san.
		Fixed assertion problem in search.c.  Thanks to SAKAKI
		Kiyotake, Tanaka Akira, and Yuichi SATO.
iso254 12/5/00	Fixed a problem to output JIS X 0213:2000 plane 2 into SJIS.
		Thanks to Shinya Hanataka.
iso255 8/30/05	Joined with less-378.
iso256 8/30/05	Joined with less-381.
iso257 9/4/05	Fixed problems caused by merge.
		Changed buffering mechanism to track exact POSITION through
		code set conversion.  This helped hiliting routine and improved
		less running speed.
		Changed to parse text from the beginning of physical line when
		less jumps into the middle of text.  This fixed major problems
		on stateful text like ISO-2022.
		Fixed JIS X 0213:2000 related problems.  Thanks to Takeshi
		WATANABE.  Also, fixed a problem reported by him.  Less will
		not split one wrong multi-byte character into different lines
		even if it is not fit in first line.  Less moves entire text
		to second line.
iso258 9/4/05	Joined with less-382.
iso259 9/6/05	Changed the algorithm to detect the gap of parsing input stream.
		This fixed a problem on long JIS/English text.
		Fixed '\r' problem.
iso260 9/19/05	Changed the algorithm handling input and output character sets.
		Now jless use two variables, one represents supporting
		character sets for input stream, and the other represents
		encoding scheme for output stream.
		Changed to support JISX0213:2004.
iso261 2/24/06	Changed put_wrongmark function to make it work with new iso260
		buffering semantics.  And applied a patch provied by Takuji.
		Thanks to Takuji.
iso262 2/24/06	Removed POSITION variable from member variables of M_BUFDATA.
		It was added to make multi-byte character buffering function
		work better with less.  However, it degraded abstraction level
		of data structure (multi.h).  This time, add POSITION* as an
		additional argument of few functions and keep data structure
		as simple as possible.
		This modification make regex_cs-lwp9k be able to compile.
*/

char version[] = "382+iso262+regex_cs-lwp9k";