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version.c

/*
 * 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.
 */


/*
----------------------- 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.
*/

char version[] = "382";

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