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version.c
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/*
* Copyright (c) 1984,1985,1989,1994,1995,1996 Mark Nudelman
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice in the documentation and/or other materials provided with
* the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
----------------------- 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 $HOME first.
v286 3/7/95 Reformat change history (too much free time?).
v287 3/8/95 Fix hilite bug if overstrike multiple chars.
v288 3/8/95 Allow lesskey to override get_editkey keys.
v289 3/9/95 Fix adj_hilite bug when line gets processed by
hilite_line more than once.
v290 3/9/95 Make configure automatically. Fix Sequent problem
with incompatible sigsetmask().
Posted to prep.ai.mit.edu
-----------------------------------------------------------------
v291 3/21/95 Add #env to lesskey. Fix MS-DOS build.
Posted to simtel.
-----------------------------------------------------------------
v292 4/24/95 Add MS-DOS support for Borland C.
Fix arrow keys in MS-DOS versions.
v293 4/28/95 Add auto-versioning stuff to make dist.
v294 5/12/95 Fix Borland build.
v295 1/20/96 Fix search on squished file; add /@@.
v296 1/23/96 Allow cmdbuf larger than screen width.
v297 1/24/96 Don't call termcap if tgetent fails;
add #defines for buffers.
v298 1/24/96 Change @@ to ^K.
Add alternate search modifiers ^N, ^F, ^E.
v299 1/25/96 Fix percent overflow in jump_percent (thanks to Brent Wiese);
don't send "ti" after shell command till RETURN pressed.
v300 1/25/96 Change -U to print tabs as ^I.
v301 1/30/96 Make hilites work in cmd F output.
v302 1/31/96 Fix cmd F to notice window-change signals.
v303 1/31/96 Add ESC-SPACE command.
v304 2/1/96 Add ^R search modifier; add LESSSECURE.
v305 2/2/96 Workaround Linux /proc kernel bug; add LESSKEY.
v306 3/16/96 Minor fixes.
v307 3/25/96 Allow cmd line arg "--"; fix DOS & OS/2 defines.h.
v308 4/4/96 Port to OS-9 (thanks to Boisy Pitre); fix -d.
v309 4/9/96 Fix OS-9 version; fix tags bug with "$".
*/
char version[] = "309";