1/*
2 * Copyright (C) 1984-2008 Mark Nudelman
3 *
4 * You may distribute under the terms of either the GNU General Public
5 * License or the Less License, as specified in the README file.
6 *
7 * For more information about less, or for information on how to
8 * contact the author, see the README file.
9 */
10
11
12/*
13----------------------- CHANGE HISTORY --------------------------
14
15 1/29/84 Allowed use on standard input
16 2/1/84 Added E, N, P commands
17 4/17/84 Added '=' command, 'stop' signal handling
18 4/20/84 Added line folding
19v2 4/27/84 Fixed '=' command to use BOTTOM_PLUS_ONE,
20 instead of TOP, added 'p' & 'v' commands
21v3 5/3/84 Added -m and -t options, '-' command
22v4 5/3/84 Added LESS environment variable
23v5 5/3/84 New comments, fixed '-' command slightly
24v6 5/15/84 Added -Q, visual bell
25v7 5/24/84 Fixed jump_back(n) bug: n should count real
26 lines, not folded lines. Also allow number on G command.
27v8 5/30/84 Re-do -q and -Q commands
28v9 9/25/84 Added "+<cmd>" argument
29v10 10/10/84 Fixed bug in -b<n> argument processing
30v11 10/18/84 Made error() ring bell if \n not entered.
31-----------------------------------------------------------------
32v12 2/13/85 Reorganized signal handling and made portable to 4.2bsd.
33v13 2/16/85 Reword error message for '-' command.
34v14 2/22/85 Added -bf and -bp variants of -b.
35v15 2/25/85 Miscellaneous changes.
36v16 3/13/85 Added -u flag for backspace processing.
37v17 4/13/85 Added j and k commands, changed -t default.
38v18 4/20/85 Rewrote signal handling code.
39v19 5/2/85 Got rid of "verbose" eq_message().
40 Made search() scroll in some cases.
41v20 5/21/85 Fixed screen.c ioctls for System V.
42v21 5/23/85 Fixed some first_cmd bugs.
43v22 5/24/85 Added support for no RECOMP nor REGCMP.
44v23 5/25/85 Miscellanous changes and prettying up.
45 Posted to USENET.
46-----------------------------------------------------------------
47v24 6/3/85 Added ti,te terminal init & de-init.
48 (Thanks to Mike Kersenbrock)
49v25 6/8/85 Added -U flag, standout mode underlining.
50v26 6/9/85 Added -M flag.
51 Use underline termcap (us) if it exists.
52v27 6/15/85 Renamed some variables to make unique in
53 6 chars. Minor fix to -m.
54v28 6/28/85 Fixed right margin bug.
55v29 6/28/85 Incorporated M.Rose's changes to signal.c
56v30 6/29/85 Fixed stupid bug in argument processing.
57v31 7/15/85 Added -p flag, changed repaint algorithm.
58 Added kludge for magic cookie terminals.
59v32 7/16/85 Added cat_file if output not a tty.
60v33 7/23/85 Added -e flag and EDITOR.
61v34 7/26/85 Added -s flag.
62v35 7/27/85 Rewrote option handling; added option.c.
63v36 7/29/85 Fixed -e flag to work if not last file.
64v37 8/10/85 Added -x flag.
65v38 8/19/85 Changed prompting; created prompt.c.
66v39 8/24/85 (Not -p) does not initially clear screen.
67v40 8/26/85 Added "skipping" indicator in forw().
68 Posted to USENET.
69-----------------------------------------------------------------
70v41 9/17/85 ONLY_RETURN, control char commands,
71 faster search, other minor fixes.
72v42 9/25/85 Added ++ command line syntax;
73 ch_fsize for pipes.
74v43 10/15/85 Added -h flag, changed prim.c algorithms.
75v44 10/16/85 Made END print in all cases of eof;
76 ignore SIGTTOU after receiv ing SIGTSTP.
77v45 10/16/85 Never print backspaces unless -u.
78v46 10/24/85 Backwards scroll in jump_loc.
79v47 10/30/85 Fixed bug in edit(): *first_cmd==0
80v48 11/16/85 Use TIOCSETN instead of TIOCSETP.
81 Added marks (m and ' commands).
82 Posted to USENET.
83-----------------------------------------------------------------
84v49 1/9/86 Fixed bug: signal didn't clear mcc.
85v50 1/15/86 Added ' (quote) to gomark.
86v51 1/16/86 Added + cmd, fixed problem if first_cmd
87 fails, made g cmd sort of "work" on pipes
88 ev en if bof is no longer buffered.
89v52 1/17/86 Made short files work better.
90v53 1/20/86 Added -P option.
91v54 1/20/86 Changed help to use HELPFILE.
92v55 1/23/86 Messages work better if not tty output.
93v56 1/24/86 Added -l option.
94v57 1/31/86 Fixed -l to get confirmation before
95 ov erwriting an existing file.
96v58 8/28/86 Added filename globbing.
97v59 9/15/86 Fixed some bugs with very long filenames.
98v60 9/26/86 Incorporated changes from Leith (Casey)
99 Leedom for boldface and -z option.
100v61 9/26/86 Got rid of annoying repaints after ! cmd.
101 Posted to USENET.
102-----------------------------------------------------------------
103v62 12/23/86 Added is_directory(); change -z default to
104 -1 instead of 24; cat-and-exit if -e and
105 file is less than a screenful.
106v63 1/8/87 Fixed bug in cat-and-exit if > 1 file.
107v64 1/12/87 Changed puts/putstr, putc/putchr,
108 getc/getchr to av oid name conflict with
109 stdio functions.
110v65 1/26/87 Allowed '-' command to change NUMBER
111 v alued options (thanks to Gary Puckering)
112v66 2/13/87 Fixed bug: prepaint should use force=1.
113v67 2/24/87 Added !! and % expansion to ! command.
114v68 2/25/87 Added SIGWINCH and TIOCGWINSZ support;
115 changed is_directory to bad_file.
116 (thanks to J. Robert Ward)
117v69 2/25/87 Added SIGWIND and WIOCGETD (for Unix PC).
118v70 3/13/87 Changed help cmd from 'h' to 'H'; better
119 error msgs in bad_file, errno_message.
120v71 5/11/87 Changed -p to -c, made triple -c/-C
121 for clear-eol like more's -c.
122v72 6/26/87 Added -E, -L, use $SHELL in lsystem().
123 (thanks to Stev e Spearman)
124v73 6/26/87 Allow Examine "#" for previous file.
125 Posted to USENET 8/25/87.
126-----------------------------------------------------------------
127v74 9/18/87 Fix conflict in EOF symbol with stdio.h,
128 Make os.c more portable to BSD.
129v75 9/23/87 Fix problems in get_term (thanks to
130 Paul Eggert); new backwards scrolling in
131 jump_loc (thanks to Marion Hakanson).
132v76 9/23/87 Added -i flag; allow single "!" to
133 inv oke a shell (thanks to Franco Barber).
134v77 9/24/87 Added -n flag and line number support.
135v78 9/25/87 Fixed problem with prompts longer than
136 the screen width.
137v79 9/29/87 Added the _ command.
138v80 10/6/87 Allow signal to break out of linenum scan.
139v81 10/6/87 Allow -b to be changed from within less.
140v82 10/7/87 Add cmd_decode to use a table for key
141 binding (thanks to Dav id Nason).
142v83 10/9/87 Allow .less file for user-defined keys.
143v84 10/11/87 Fix -e/-E problems (thanks to Felix Lee).
144v85 10/15/87 Search now keeps track of line numbers.
145v86 10/20/87 Added -B option and autobuf; fixed
146 "pipe error" bug.
147v87 3/1/88 Fix bug re BSD signals while reading file.
148v88 3/12/88 Use new format for -P option (thanks to
149 der Mouse), allow "+-c" without message,
150 fix bug re BSD hangup.
151v89 3/18/88 Turn off line numbers if linenum scan
152 is interrupted.
153v90 3/30/88 Allow -P from within less.
154v91 3/30/88 Added tags file support (new -t option)
155 (thanks to Brian Campbell).
156v92 4/4/88 Added -+option syntax.
157v93 4/11/88 Add support for slow input (thanks to
158 Joe Orost & apologies for taking almost
159 3 years to get this in!)
160v94 4/11/88 Redo reading/signal stuff.
161v95 4/20/88 Repaint screen better after signal.
162v96 4/21/88 Add /! and ?! commands.
163v97 5/17/88 Allow -l/-L from within less.
164 Eliminate some static arrays (use calloc).
165 Posted to USENET.
166-----------------------------------------------------------------
167v98 10/14/88 Fix incorrect calloc call; uninitialized
168 var in exec_mca; core dump on unknown TERM.
169 Make v cmd work if past last line of file.
170 Fix some signal bugs.
171v99 10/29/88 Allow space between -X and string,
172 when X is a string-valued option.
173v100 1/5/89 Fix globbing bug when $SHELL not set;
174 allow spaces after -t command.
175v101 1/6/89 Fix problem with long (truncated) lines
176 in tags file (thanks to Neil Dixon).
177v102 1/6/89 Fix bug with E# when no prev file;
178 allow spaces after -l command.
179v103 3/14/89 Add -N, -f and -? options. Add z and w
180 commands. Add %L for prompt strings.
181v104 3/16/89 Added EDITPROTO.
182v105 3/20/89 Fix bug in find_linenum which cached
183 incorrectly on long lines.
184v106 3/31/89 Added -k option and multiple lesskey
185 files.
186v107 4/27/89 Add 8-bit char support and -g option.
187 Split option code into 3 files.
188v108 5/5/89 Allocate position table dynamically
189 (thanks to Paul Eggert); change % command
190 from "percent" to vi-style brace finder.
191v109 5/10/89 Added ESC-% command, split prim.c.
192v110 5/24/89 Fixed bug in + option; fixed repaint bug
193 under Sun windows (thanks to Paul Eggert).
194v111 5/25/89 Generalized # and % expansion; use
195 calloc for some error messages.
196v112 5/30/89 Get rid of ESC-%, add {}()[] commands.
197v113 5/31/89 Optimize lseeks (thanks to Paul Eggert).
198v114 7/25/89 Added ESC-/ and ESC-/! commands.
199v115 7/26/89 Added ESC-n command.
200v116 7/31/89 Added find_pos to optimize g command.
201v117 8/1/89 Change -f option to -r.
202v118 8/2/89 Save positions for all previous files,
203 not just the immediately previous one.
204v119 8/7/89 Save marks across file boundaries.
205 Add file handle stuff.
206v120 8/11/89 Add :ta command.
207v121 8/16/89 Add -f option.
208v122 8/30/89 Fix performance with many buffers.
209v123 8/31/89 Verbose prompts for string options.
210 Posted beta to USENET.
211-----------------------------------------------------------------
212v124 9/18/89 Reorganize search commands,
213 N = rev, ESC-n = span, add ESC-N.
214v125 9/18/89 Fix tab bug (thanks to Alex Liu).
215 Fix EOF bug when both -w and -c.
216v126 10/25/89 Add -j option.
217v127 10/27/89 Fix problems with blank lines before BOF.
218v128 10/27/89 Add %bj, etc. to prompt strings.
219v129 11/3/89 Add -+,-- commands; add set-option and
220 unset-option to lesskey.
221v130 11/6/89 Generalize A_EXTRA to string, remove
222 set-option, unset-option from lesskey.
223v131 11/7/89 Changed name of EDITPROTO to LESSEDIT.
224v132 11/8/89 Allow editing of command prefix.
225v133 11/16/89 Add -y option (thanks to Jeff Sullivan).
226v134 12/1/89 Glob filenames in the -l command.
227v135 12/5/89 Combined {}()[] commands into one, and
228 added ESC-^F and ESC-^B commands.
229v136 1/20/90 Added -S, -R flags. Added | command.
230 Added warning for binary files. (thanks
231 to Richard Brittain and J. Sullivan).
232v137 1/21/90 Rewrote horrible pappend code.
233 Added * notation for hi-bit chars.
234v138 1/24/90 Fix magic cookie terminal handling.
235 Get rid of "cleanup" loop in ch_get.
236v139 1/27/90 Added MSDOS support. (many thanks
237 to Richard Brittain).
238v140 2/7/90 Editing a new file adds it to the
239 command line list.
240v141 2/8/90 Add edit_list for editing >1 file.
241v142 2/10/90 Add :x command.
242v143 2/11/90 Add * and @ modifies to search cmds.
243 Change ESC-/ cmd from /@* to / *.
244v144 3/1/90 Messed around with ch_zero;
245 no real change.
246v145 3/2/90 Added -R and -v/-V for MSDOS;
247 renamed FILENAME to avoid conflict.
248v146 3/5/90 Pull cmdbuf functions out of command.c
249v147 3/7/90 Implement ?@; fix multi-file edit bugs.
250v148 3/29/90 Fixed bug in :e<file> then :e#.
251v149 4/3/90 Change error,ierror,query to use PARG.
252v150 4/6/90 Add LESS_CHARSET, LESS_CHARDEF.
253v151 4/13/90 Remove -g option; clean up ispipe.
254v152 4/14/90 lsystem() closes input file, for
255 editors which require exclusive open.
256v153 4/18/90 Fix bug if SHELL unset;
257 fix bug in overstrike control char.
258v154 4/25/90 Output to fd 2 via buffer.
259v155 4/30/90 Ignore -i if uppercase in pattern
260 (thanks to Michael Rendell.)
261v156 5/3/90 Remove scroll limits in forw() & back();
262 causes problems with -c.
263v157 5/4/90 Forward search starts at next real line
264 (not screen line) after jump target.
265v158 6/14/90 Added F command.
266v159 7/29/90 Fix bug in exiting: output not flushed.
267v160 7/29/90 Clear screen before initial output w/ -c.
268v161 7/29/90 Add -T flag.
269v162 8/14/90 Fix bug with +F on command line.
270v163 8/21/90 Added LESSBINFMT variable.
271v164 9/5/90 Added -p, LINES, COLUMNS and
272 unset mark ' == BOF, for 1003.2 D5.
273v165 9/6/90 At EOF with -c set, don't display empty
274 screen when try to page forward.
275v166 9/6/90 Fix G when final line in file wraps.
276v167 9/11/90 Translate CR/LF -> LF for 1003.2.
277v168 9/13/90 Return to curr file if "tag not found".
278v169 12/12/90 G goes to EOF even if file has grown.
279v170 1/17/91 Add optimization for BSD _setjmp;
280 fix #include ioctl.h TERMIO problem.
281 (thanks to Paul Eggert)
282 Posted to USENET.
283-----------------------------------------------------------------
284v171 3/6/91 Fix -? bug in get_filename.
285v172 3/15/91 Fix G bug in empty file.
286 Fix bug with ?\n and -i and uppercase
287 pattern at EOF!
288 (thanks to Paul Eggert)
289v173 3/17/91 Change N cmd to not permanently change
290 direction. (thanks to Brian Matthews)
291v174 3/18/91 Fix bug with namelogfile not getting
292 cleared when change files.
293v175 3/18/91 Fix bug with ++cmd on command line.
294 (thanks to Jim Meyering)
295v176 4/2/91 Change | to not force current screen,
296 include marked line, start/end from
297 top of screen. Improve search speed.
298 (thanks to Don Mears)
299v177 4/2/91 Add LESSHELP variable.
300 Fix bug with F command with -e.
301 Try /dev/tty for input before using fd 2.
302 Patches posted to USENET 4/2/91.
303-----------------------------------------------------------------
304v178 4/8/91 Fixed bug in globbing logfile name.
305 (thanks to Jim Meyering)
306v179 4/9/91 Allow negative -z for screen-relative.
307v180 4/9/91 Clear to eos rather than eol if "db";
308 don't use "sr" if "da".
309 (thanks to Tor Lillqvist)
310v181 4/18/91 Fixed bug with "negative" chars 80 - FF.
311 (thanks to Benny Sander Hofmann)
312v182 5/16/91 Fixed bug with attribute at EOL.
313 (thanks to Brian Matthews)
314v183 6/1/91 Rewrite linstall to do smart config.
315v184 7/11/91 Process \b in searches based on -u
316 rather than -i.
317v185 7/11/91 -Pxxx sets short prompt; assume SIGWINCH
318 after a SIGSTOP. (thanks to Ken Laprade)
319-----------------------------------------------------------------
320v186 4/20/92 Port to MS-DOS (Microsoft C).
321v187 4/23/92 Added -D option & TAB_COMPLETE_FILENAME.
322v188 4/28/92 Added command line editing features.
323v189 12/8/92 Fix mem overrun in anscreen.c:init;
324 fix edit_list to recover from bin file.
325v190 2/13/93 Make TAB enter one filename at a time;
326 create ^L with old TAB functionality.
327v191 3/10/93 Defer creating "flash" page for MS-DOS.
328v192 9/6/93 Add BACK-TAB.
329v193 9/17/93 Simplify binary_file handling.
330v194 1/4/94 Add rudiments of alt_filename handling.
331v195 1/11/94 Port back to Unix; support keypad.
332-----------------------------------------------------------------
333v196 6/7/94 Fix bug with bad filename; fix IFILE
334 type problem. (thanks to David MacKenzie)
335v197 6/7/94 Fix bug with .less tables inserted wrong.
336v198 6/23/94 Use autoconf installation technology.
337 (thanks to David MacKenzie)
338v199 6/29/94 Fix MS-DOS build (thanks to Tim Wiegman).
339v200 7/25/94 Clean up copyright, minor fixes.
340 Posted to prep.ai.mit.edu
341-----------------------------------------------------------------
342v201 7/27/94 Check for no memcpy; add casts to calloc;
343 look for regcmp in libgen.a.
344 (thanks to Kaveh Ghazi).
345v202 7/28/94 Fix bug in edit_next/edit_prev with
346 non-existant files.
347v203 8/2/94 Fix a variety of configuration bugs on
348 various systems. (thanks to Sakai
349 Kiyotaka, Harald Koenig, Bjorn Brox,
350 Teemu Rantanen, and Thorsten Lockert)
351v204 8/3/94 Use strerror if available.
352 (thanks to J.T. Conklin)
353v205 8/5/94 Fix bug in finding "me" termcap entry.
354 (thanks to Andreas Stolcke)
3558/10/94 v205+: Change BUFSIZ to LBUFSIZE to avoid name
356 conflict with stdio.h.
357 Posted to prep.ai.mit.edu
358-----------------------------------------------------------------
359v206 8/10/94 Use initial_scrpos for -t to avoid
360 displaying first page before init().
361 (thanks to Dominique Petitpierre)
362v207 8/12/94 Fix bug if stdout is not tty.
363v208 8/16/94 Fix bug in close_altfile if goto err1
364 in edit_ifile. (Thanks to M.J. Hewitt)
365v209 8/16/94 Change scroll to wscroll to avoid
366 conflict with library function.
367v210 8/16/94 Fix bug with bold on 8 bit chars.
368 (thanks to Vitor Duarte)
369v211 8/16/94 Don't quit on EOI in jump_loc / forw.
370v212 8/18/94 Use time_t if available.
371v213 8/20/94 Allow ospeed to be defined in termcap.h.
372v214 8/20/94 Added HILITE_SEARCH, -F, ESC-u cmd.
373 (thanks to Paul Lew and Bob Byrnes)
374v215 8/23/94 Fix -i toggle behavior.
375v216 8/23/94 Process BS in all searches, not only -u.
376v217 8/24/94 Added -X flag.
377v218 8/24/94 Reimplement undo_search.
378v219 8/24/94 Find tags marked with line number
379 instead of pattern.
380v220 8/24/94 Stay at same position after SIG_WINCH.
381v221 8/24/94 Fix bug in file percentage in big file.
382v222 8/25/94 Do better if can't reopen current file.
383v223 8/27/94 Support setlocale.
384 (thanks to Robert Joop)
385v224 8/29/94 Revert v216: process BS in search
386 only if -u.
387v225 9/6/94 Rewrite undo_search again: toggle.
388v226 9/15/94 Configuration fixes.
389 (thanks to David MacKenzie)
390v227 9/19/94 Fixed strerror config problem.
391 Posted to prep.ai.mit.edu
392-----------------------------------------------------------------
393v228 9/21/94 Fix bug in signals: repeated calls to
394 get_editkeys overflowed st_edittable.
395v229 9/21/94 Fix "Nothing to search" error if -a
396 and SRCH_PAST_EOF.
397v230 9/21/94 Don't print extra error msg in search
398 after regerror().
399v231 9/22/94 Fix hilite bug if search matches 0 chars.
400 (thanks to John Polstra)
401v232 9/23/94 Deal with weird systems that have
402 termios.h but not tcgetattr().
403 Posted to prep.ai.mit.edu
404-----------------------------------------------------------------
405v233 9/26/94 Use get_term() instead of pos_init() in
406 psignals to re-get lower_left termcap.
407 (Thanks to John Malecki)
408v234 9/26/94 Make MIDDLE closer to middle of screen.
409v235 9/27/94 Use local strchr if system doesn't have.
410v236 9/28/94 Don't use libucb; use libterm if
411 libtermcap & libcurses doesn't work.
412 (Fix for Solaris; thanks to Frank Kaefer)
413v237 9/30/94 Use system isupper() etc if provided.
414 Posted to prep.ai.mit.edu
415-----------------------------------------------------------------
416v238 10/6/94 Make binary non-blinking if LESSBINFMT
417 is set to a string without a *.
418v239 10/7/94 Don't let delimit_word run back past
419 beginning of cmdbuf.
420v240 10/10/94 Don't write into termcap buffer.
421 (Thanks to Benoit Speckel)
422v241 10/13/94 New lesskey file format.
423 Don't expand filenames in search command.
424v242 10/14/94 Allow lesskey specification of "literal".
425v243 10/14/94 Add #stop command to lesskey.
426v244 10/16/94 Add -f flag to lesskey.
427v245 10/25/94 Allow TAB_COMPLETE_FILENAME to be undefd.
428v246 10/27/94 Move help file to /usr/local/share.
429v247 10/27/94 Add -V option.
430v248 11/5/94 Add -V option to lesskey.
431v249 11/5/94 Remove -f flag from lesskey; default
432 input file is ~/.lesskey.in, not stdin.
433v250 11/7/94 Lesskey input file "-" means stdin.
434v251 11/9/94 Convert cfgetospeed result to ospeed.
435 (Thanks to Andrew Chernov)
436v252 11/16/94 Change default lesskey input file from
437 .lesskey.in to .lesskey.
438 Posted to prep.ai.mit.edu
439-----------------------------------------------------------------
440v253 11/21/94 Fix bug when tags file has a backslash.
441v254 12/6/94 Fix -k option.
442v255 12/8/94 Add #define EXAMINE to disable :e etc.
443v256 12/10/94 Change highlighting: only highlite search
444 results (but now it is reliable).
445v257 12/10/94 Add goto_line and repaint_highlight
446 to optimize highlight repaints.
447v258 12/12/94 Fixup in hilite_line if BS_SPECIAL.
448v259 12/12/94 Convert to autoconf 2.0.
449v260 12/13/94 Add SECURE define.
450v261 12/14/94 Use system WERASE char as EC_W_BACKSPACE.
451v262 12/16/94 Add -g/-G flag and screen_hilite.
452v263 12/20/94 Reimplement/optimize -G flag behavior.
453v264 12/23/94 Allow EXTRA string after line-edit cmd
454 in lesskey file.
455v265 12/24/94 Add LESSOPEN=|cmd syntax.
456v266 12/26/94 Add -I flag.
457v267 12/28/94 Formalize the four-byte header emitted
458 by a LESSOPEN pipe.
459v268 12/28/94 Get rid of four-byte header.
460v269 1/2/95 Close alt file before open new one.
461 Avoids multiple popen().
462v270 1/3/95 Use VISUAL; use S_ISDIR/S_ISREG; fix
463 config problem with Solaris POSIX regcomp.
464v271 1/4/95 Don't quit on read error.
465v272 1/5/95 Get rid of -L.
466v273 1/6/95 Fix ch_ungetchar bug; don't call
467 LESSOPEN on a pipe.
468v274 1/6/95 Ported to OS/2 (thanks to Kai Uwe Rommel)
469v275 1/18/95 Fix bug if toggle -G at EOF.
470v276 1/30/95 Fix OS/2 version.
471v277 1/31/95 Add "next" charset; don't display ^X
472 for X > 128.
473v278 2/14/95 Change default for -G.
474 Posted to prep.ai.mit.edu
475-----------------------------------------------------------------
476v279 2/22/95 Add GNU options --help, --version.
477 Minor config fixes.
478v280 2/24/95 Clean up calls to glob(); don't set #
479 if we can't open the new file.
480v281 2/24/95 Repeat search should turn on hilites.
481v282 3/2/95 Minor fixes.
482v283 3/2/95 Fix homefile; make OS2 look in $HOME.
483v284 3/2/95 Error if "v" on LESSOPENed file;
484 "%" figures out file size on pipe.
485v285 3/7/95 Don't set # in lsystem;
486 lesskey try $HOME first.
487v286 3/7/95 Reformat change history (too much free time?).
488v287 3/8/95 Fix hilite bug if overstrike multiple chars.
489v288 3/8/95 Allow lesskey to override get_editkey keys.
490v289 3/9/95 Fix adj_hilite bug when line gets processed by
491 hilite_line more than once.
492v290 3/9/95 Make configure automatically. Fix Sequent problem
493 with incompatible sigsetmask().
494 Posted to prep.ai.mit.edu
495-----------------------------------------------------------------
496v291 3/21/95 Add #env to lesskey. Fix MS-DOS build.
497 Posted to simtel.
498-----------------------------------------------------------------
499v292 4/24/95 Add MS-DOS support for Borland C.
500 Fix arrow keys in MS-DOS versions.
501v293 4/28/95 Add auto-versioning stuff to make dist.
502v294 5/12/95 Fix Borland build.
503v295 1/20/96 Fix search on squished file; add /@@.
504v296 1/23/96 Allow cmdbuf larger than screen width.
505v297 1/24/96 Don't call termcap if tgetent fails;
506 add #defines for buffers.
507v298 1/24/96 Change @@ to ^K.
508 Add alternate search modifiers ^N, ^F, ^E.
509v299 1/25/96 Fix percent overflow in jump_percent (thanks to Brent Wiese);
510 don't send "ti" after shell command till RETURN pressed.
511v300 1/25/96 Change -U to print tabs as ^I.
512v301 1/30/96 Make hilites work in cmd F output.
513v302 1/31/96 Fix cmd F to notice window-change signals.
514v303 1/31/96 Add ESC-SPACE command.
515v304 2/1/96 Add ^R search modifier; add LESSSECURE.
516v305 2/2/96 Workaround Linux /proc kernel bug; add LESSKEY.
517v306 3/16/96 Minor fixes.
518v307 3/25/96 Allow cmd line arg "--"; fix DOS & OS/2 defines.h.
519v308 4/4/96 Port to OS-9 (thanks to Boisy Pitre); fix -d.
520v309 4/9/96 Fix OS-9 version; fix tags bug with "$".
521v310 4/10/96 Get rid of HELPFILE.
522v311 4/22/96 Add Windows32 support; merge doscreen.c into screen.c.
523v312 4/24/96 Don't quit after "cannot reopen" error.
524v313 4/25/96 Added horizontal scrolling.
525v314 4/26/96 Modified -e to quit on reaching end of a squished file.
526v315 4/26/96 Fix "!;TAB" bug.
527v316 5/2/96 Make "|a" when (a < curr screen) go to end of curr screen.
528v317 5/14/96 Various fixes for the MS-DOS and OS/2 builds.
529 Added ## and %% handling for filenames
530v318 5/29/96 Port to OS-9 Microware compiler; minor fixes
531 (thanks to Martin Gregorie).
532v319 7/8/96 Fix Windows port (thanks to Jeff Paquette).
533v320 7/11/96 Final fixes for Windows port.
534v321 7/18/96 Minor fixes.
535 Posted to Web page.
536-----------------------------------------------------------------
537v322 8/13/96 Fix bug in shell escape from help file; add support for
538 Microsoft Visual C under Windows; numerous small fixes.
539v323 8/19/96 Fixes for Windows version (thanks to Simon Munton);
540 fix for Linux library weirdness (thanks to Jim Diamond);
541 port to DJGPP (thanks to Eli Zaretskii).
542v324 8/21/96 Add support for spaces in filenames (thanks to Simon Munton).
543v325 8/21/96 Add lessecho, for spaces in filenames under Unix.
544v326 8/27/96 Fix DJGPP version.
545v327 9/1/96 Reorganize lglob, make spaces in filenames work better in Unix.
546v328 10/7/96 Append / to directory name in filename completion.
547 Fix MS-DOS and OS-9 versions.
548v329 10/11/96 Fix more MS-DOS bugs; add LESSSEPARATOR; add -" option.
549 Add LESSMETACHARS, LESSMETAESCAPE.
550v330 10/21/96 Minor fixes.
551 Posted to Web page.
552-----------------------------------------------------------------
553v331 4/22/97 Various Windows fixes (thanks to Gurusamy Sarathy).
554v332 4/22/97 Enter filenames from cmd line into edit history.
555 Posted to Web page.
556-----------------------------------------------------------------
557v333 3/4/99 Changed -w to highlite new line after forward movement.
558v334 3/9/99 Avoid overflowing prompt buffer; add %d and %D.
559v335 3/20/99 Add EBCDIC support (thanks to Thomas Dorner).
560 Use HOMEDRIVE/HOMEPATH on Windows (thanks to Preston Bannister).
561 Posted to Web page.
562-----------------------------------------------------------------
563v336 4/8/99 Fix installation bugs.
564v337 4/9/99 Fix another installation bug.
565 Posted to Web page.
566-----------------------------------------------------------------
567v338 4/13/99 Add support for long option names.
568v339 4/18/99 Add \k, long option names to lesskey. Add -^P. Add :d.
569v340 4/21/99 Add regexec2. Fix Windows build.
570 Posted to Web page.
571-----------------------------------------------------------------
572v341 5/6/99 Add -F option; %c & ?c prompt escapes.
573 (Thanks to Michele Maltoni)
574v342 7/22/99 Add system-wide lesskey file; allow GPL or Less License.
575v343 9/23/99 Support UTF-8 (Thanks to Robert Brady).
576 Add %P and ?P in prompts.
577v344 10/27/99 -w highlights target line of g and p commands.
578v345 10/29/99 Make -R pass thru ESC but not other control chars.
579 Posted to Web page.
580-----------------------------------------------------------------
581v346 11/4/99 Fix bugs in long option processing; R cmd should clear hilites.
582 Posted to Web page.
583-----------------------------------------------------------------
584v347 12/13/99 Fixes for DJGPP version (thanks to Eli Zaretskii).
585v348 12/28/99 Fix deleting file with marks (thanks to Dimitar Jekov).
586 Fix color problem in DJGPP version (thanks to Eli Zaretskii).
587v349 1/24/00 Fix minor DJGPP bugs; check environment vars for UTF-8;
588 add --with-editor (thanks to Eli, Markus Kuhn, Thomas Schoepf).
589v350 3/1/00 Fix clear-while-standout bug.
590v351 3/5/00 Change -M and = prompts to show top & bottom line number.
591 Posted to Web page.
592-----------------------------------------------------------------
593v352 3/8/00 Fix scan_option NULL dereference.
594-----------------------------------------------------------------
595v353 3/20/00 Fix SECURE compile bug, allow space after numeric option.
596v354 3/23/00 Add support for PCRE; add --with-regex configure option.
597-----------------------------------------------------------------
598v355 6/28/00 Add -# option (thanks to Andy Levinson).
599v356 7/5/00 Add -J option.
600v357 7/6/00 Support sigprocmask.
601-----------------------------------------------------------------
602v358 7/8/00 Fix problems with #stop in lesskey file.
603 Posted to Web page.
604-----------------------------------------------------------------
605v359 9/10/00 Fixes for Win32 display problems (thanks to Maurizio Vairani).
606v360 1/17/01 Move sysless to etc.
607v361 12/4/01 Add IBM-1047 charset & EBCDIC fixes (thanks to Thomas Dorner).
608 Fix 32 bit dependencies (thanks to Paul Eggert).
609 Fix UTF-8 overstriking (thanks to Robert Brady).
610v362 12/4/01 Make status column show search targets.
611v363 12/6/01 Add --no-keypad option.
612 Add variable width tabstops (thanks to Peter Samuelson).
613v364 12/10/01 Better handling of very long lines in input;
614 Fix horizontal shifting of colored text.
615v365 12/11/01 Fix overstriking of tabs;
616 Add support for global(1) and multiple tag matches
617 (thanks to Shigio Yamaguchi and Tim Vanderhoek).
618v366 12/11/01 Fixes for OS/2 (thanks to Kyosuke Tokoro).
619v367 12/13/01 Allow -D and -x options to terminate without dollar sign;
620 Right/left arrow when entering N are shift cmds, not line edit.
621v368 12/18/01 Update lesskey commands.
622v370 12/23/01 Fix tags error messages.
623 Posted to Web page.
624-----------------------------------------------------------------
625v371 12/26/01 Fix new_file bug; use popen in Windows version;
626 fix some compiler warnings.
627v372 12/29/01 Make -b be in units of 1K.
628v373 1/14/02 Improve handling of filenames containing shell metachars.
629v374 2/7/02 Fix memory leak; fix bug in -x argument parsing.
630v375 4/7/02 Fix searching for SGR sequences; fix SECURE build;
631 add SGR support to DJGPP version (thanks to Eli Zaretskii).
632v376 6/10/02 Fix bug in overstriking mulitbyte UTF-8 characters
633 (thanks to Jungshik Shin).
634 Posted to Web page.
635-----------------------------------------------------------------
636v377 9/10/02 Fix bug in Windows version when file contains CR;
637 fix bug in search highlights with -R;
638 make initial buffer limit really be 64K not unlimited.
639v378 9/30/02 Misc bug fixes and compiler warning cleanup.
640 Posted to Web page.
641-----------------------------------------------------------------
642v379 11/23/02 Add -L option; fix bug with ctrl-K in lesskey files;
643 improve UTF-8 overstriking and underscore overstriking;
644 fix minor man page problems; change to autoconf 2.54.
645v380 11/24/02 Make LINENUM same as POSITION.
646v381 11/28/02 Make -N use 7 columns for line number if possible.
647-----------------------------------------------------------------
648v382 2/3/04 Remove copyrighted code.
649-----------------------------------------------------------------
650v383 2/16/04 Add history file; add -K option; improve UTF-8 handling;
651 fix some signed char bugs (thanks to Christian Biere);
652 fix some upper/lower case bugs (thanks to Bjoern Jacke);
653 add erase2 char (thanks to David Lawrence);
654 add windows charset (thanks to Dimitar Zhekov).
655v384 2/20/04 Improvements in UTF-8 handling.
656v385 2/23/04 Fix UTF-8 output bug.
657-----------------------------------------------------------------
658v386 9/13/05 Improvements to UTF-8 shift & color (thanks to Charles Levert);
659 protect against invalid LESSOPEN and LESSCLOSE values.
660v387 9/14/05 Update Charles Levert's UTF-8 patch.
661v388 9/14/05 Change history behavior; change most sprintf calls to snprintf.
662v389 9/14/05 Fix copy & paste with long lines; improve performance of
663 expand_linebuf; fix crash in init_mlist;
664v390 9/15/05 Show search matches in status column even if -G is set.
665-----------------------------------------------------------------
666v391 9/17/05 Fix bugs.
667v392 10/14/05 Fix line wrapping bug.
668v393 10/19/05 Allow multiple attributes per char; fix bold+underline bug
669 (thanks again to Charles Levert).
670v394 11/8/05 Fix prompt bug; fix compile problem in Windows build.
671-----------------------------------------------------------------
672v395 1/12/07 Update Unicode tables (thanks to Charles Levert);
673 don't chmod if LESSHISTFILE = /dev/null;
674 make -f work for directories; support DESTDIR in Makefile;
675 fix sigset_t detection in configure;
676 make "t" cmd traverse tags in correct order
677v396 1/13/07 Add compatibility with POSIX more.
678v397 3/21/07 Allow decimal point in number for % command;
679 Allow decimal point in number for -j option;
680 Allow n command to fetch last search pattern from history
681 (thanks to arno).
682v398 3/22/07 Don't rewrite history file if not necessary;
683 fix bug when filenames contain "$".
684v399 3/22/07 Don't move to bottom of screen at startup;
685 don't output extraneous newlines.
686v400 3/23/07 Allow search to find pattern after null byte (PCRE and no-regex)
687 (thanks to Michael Constant).
688-----------------------------------------------------------------
689v401 3/24/07 Minor documentation fixes.
690v402 3/30/07 Fix autoconf bug when memcpy etc are inline;
691 fix bug in terminating number following -j option.
692v403 5/25/07 Fix Windows build.
693v404 6/5/07 Fix display bug with F command and long lines.
694v405 6/17/07 Fix display bug when using -w option.
695v406 6/17/07 Fix secure build.
696v407 8/16/07 Fix bugs; support CSI chars.
697v408 10/1/07 Fix bug in -i with non-ASCII chars.
698v409 10/12/07 Fix crash when viewing text with invalid UTF-8 sequences.
699v411 11/6/07 Fix case-insensitive searching with non-ASCII text.
700v412 11/6/07 Use symbolic SEEK constants.
701v413 11/6/07 Fix search highlight bug with non-ASCII text.
702v414 11/6/07 Fix display bug with no-wrap terminals.
703v415 11/14/07 Add --follow-name option.
704v416 11/22/07 Fix crash when searching text with invalid UTF-8 sequences.
705v417 12/31/07 Don't support single-char CSI in UTF-8 mode;
706 fix bug with -R and invalid CSI sequences;
707 fix bug searching text with SGR sequences with -r;
708 emulate SGR sequences in WIN32 build.
709v418 12/31/07 Clean up.
710-----------------------------------------------------------------
711v419 1/16/08 Make CSI char 0x9B work in UTF-8 mode (thanks to Colin Watson).
712v420 2/24/08 Add & command; fix -F option; fix '' after G.
713v421 2/24/08 Ignore filtered lines when searching.
714v422 3/2/08 Output CR at startup.
715v423 5/27/08 Clean up.
716v424 6/16/08 Fix compile bug with pcre; don't filter help file.
717v425 7/14/08 Fix non-ANSI code in list handling in ch.c.
718v426 10/27/08 Fix ignaw terminal handling (thanks to Per Hedeland);
719 fix binary file detection in UTF-8 mode.
720v427 3/16/09 A few Win32 fixes (thanks to Jason Hood).
721v428 3/30/09 Add "|-" syntax to LESSOPEN.
722v429 4/10/09 Fix search highlighting bug with underlined text.
723*/
724
725char version[] = "429";
2 * Copyright (C) 1984-2008 Mark Nudelman
3 *
4 * You may distribute under the terms of either the GNU General Public
5 * License or the Less License, as specified in the README file.
6 *
7 * For more information about less, or for information on how to
8 * contact the author, see the README file.
9 */
10
11
12/*
13----------------------- CHANGE HISTORY --------------------------
14
15 1/29/84 Allowed use on standard input
16 2/1/84 Added E, N, P commands
17 4/17/84 Added '=' command, 'stop' signal handling
18 4/20/84 Added line folding
19v2 4/27/84 Fixed '=' command to use BOTTOM_PLUS_ONE,
20 instead of TOP, added 'p' & 'v' commands
21v3 5/3/84 Added -m and -t options, '-' command
22v4 5/3/84 Added LESS environment variable
23v5 5/3/84 New comments, fixed '-' command slightly
24v6 5/15/84 Added -Q, visual bell
25v7 5/24/84 Fixed jump_back(n) bug: n should count real
26 lines, not folded lines. Also allow number on G command.
27v8 5/30/84 Re-do -q and -Q commands
28v9 9/25/84 Added "+<cmd>" argument
29v10 10/10/84 Fixed bug in -b<n> argument processing
30v11 10/18/84 Made error() ring bell if \n not entered.
31-----------------------------------------------------------------
32v12 2/13/85 Reorganized signal handling and made portable to 4.2bsd.
33v13 2/16/85 Reword error message for '-' command.
34v14 2/22/85 Added -bf and -bp variants of -b.
35v15 2/25/85 Miscellaneous changes.
36v16 3/13/85 Added -u flag for backspace processing.
37v17 4/13/85 Added j and k commands, changed -t default.
38v18 4/20/85 Rewrote signal handling code.
39v19 5/2/85 Got rid of "verbose" eq_message().
40 Made search() scroll in some cases.
41v20 5/21/85 Fixed screen.c ioctls for System V.
42v21 5/23/85 Fixed some first_cmd bugs.
43v22 5/24/85 Added support for no RECOMP nor REGCMP.
44v23 5/25/85 Miscellanous changes and prettying up.
45 Posted to USENET.
46-----------------------------------------------------------------
47v24 6/3/85 Added ti,te terminal init & de-init.
48 (Thanks to Mike Kersenbrock)
49v25 6/8/85 Added -U flag, standout mode underlining.
50v26 6/9/85 Added -M flag.
51 Use underline termcap (us) if it exists.
52v27 6/15/85 Renamed some variables to make unique in
53 6 chars. Minor fix to -m.
54v28 6/28/85 Fixed right margin bug.
55v29 6/28/85 Incorporated M.Rose's changes to signal.c
56v30 6/29/85 Fixed stupid bug in argument processing.
57v31 7/15/85 Added -p flag, changed repaint algorithm.
58 Added kludge for magic cookie terminals.
59v32 7/16/85 Added cat_file if output not a tty.
60v33 7/23/85 Added -e flag and EDITOR.
61v34 7/26/85 Added -s flag.
62v35 7/27/85 Rewrote option handling; added option.c.
63v36 7/29/85 Fixed -e flag to work if not last file.
64v37 8/10/85 Added -x flag.
65v38 8/19/85 Changed prompting; created prompt.c.
66v39 8/24/85 (Not -p) does not initially clear screen.
67v40 8/26/85 Added "skipping" indicator in forw().
68 Posted to USENET.
69-----------------------------------------------------------------
70v41 9/17/85 ONLY_RETURN, control char commands,
71 faster search, other minor fixes.
72v42 9/25/85 Added ++ command line syntax;
73 ch_fsize for pipes.
74v43 10/15/85 Added -h flag, changed prim.c algorithms.
75v44 10/16/85 Made END print in all cases of eof;
76 ignore SIGTTOU after receiv ing SIGTSTP.
77v45 10/16/85 Never print backspaces unless -u.
78v46 10/24/85 Backwards scroll in jump_loc.
79v47 10/30/85 Fixed bug in edit(): *first_cmd==0
80v48 11/16/85 Use TIOCSETN instead of TIOCSETP.
81 Added marks (m and ' commands).
82 Posted to USENET.
83-----------------------------------------------------------------
84v49 1/9/86 Fixed bug: signal didn't clear mcc.
85v50 1/15/86 Added ' (quote) to gomark.
86v51 1/16/86 Added + cmd, fixed problem if first_cmd
87 fails, made g cmd sort of "work" on pipes
88 ev en if bof is no longer buffered.
89v52 1/17/86 Made short files work better.
90v53 1/20/86 Added -P option.
91v54 1/20/86 Changed help to use HELPFILE.
92v55 1/23/86 Messages work better if not tty output.
93v56 1/24/86 Added -l option.
94v57 1/31/86 Fixed -l to get confirmation before
95 ov erwriting an existing file.
96v58 8/28/86 Added filename globbing.
97v59 9/15/86 Fixed some bugs with very long filenames.
98v60 9/26/86 Incorporated changes from Leith (Casey)
99 Leedom for boldface and -z option.
100v61 9/26/86 Got rid of annoying repaints after ! cmd.
101 Posted to USENET.
102-----------------------------------------------------------------
103v62 12/23/86 Added is_directory(); change -z default to
104 -1 instead of 24; cat-and-exit if -e and
105 file is less than a screenful.
106v63 1/8/87 Fixed bug in cat-and-exit if > 1 file.
107v64 1/12/87 Changed puts/putstr, putc/putchr,
108 getc/getchr to av oid name conflict with
109 stdio functions.
110v65 1/26/87 Allowed '-' command to change NUMBER
111 v alued options (thanks to Gary Puckering)
112v66 2/13/87 Fixed bug: prepaint should use force=1.
113v67 2/24/87 Added !! and % expansion to ! command.
114v68 2/25/87 Added SIGWINCH and TIOCGWINSZ support;
115 changed is_directory to bad_file.
116 (thanks to J. Robert Ward)
117v69 2/25/87 Added SIGWIND and WIOCGETD (for Unix PC).
118v70 3/13/87 Changed help cmd from 'h' to 'H'; better
119 error msgs in bad_file, errno_message.
120v71 5/11/87 Changed -p to -c, made triple -c/-C
121 for clear-eol like more's -c.
122v72 6/26/87 Added -E, -L, use $SHELL in lsystem().
123 (thanks to Stev e Spearman)
124v73 6/26/87 Allow Examine "#" for previous file.
125 Posted to USENET 8/25/87.
126-----------------------------------------------------------------
127v74 9/18/87 Fix conflict in EOF symbol with stdio.h,
128 Make os.c more portable to BSD.
129v75 9/23/87 Fix problems in get_term (thanks to
130 Paul Eggert); new backwards scrolling in
131 jump_loc (thanks to Marion Hakanson).
132v76 9/23/87 Added -i flag; allow single "!" to
133 inv oke a shell (thanks to Franco Barber).
134v77 9/24/87 Added -n flag and line number support.
135v78 9/25/87 Fixed problem with prompts longer than
136 the screen width.
137v79 9/29/87 Added the _ command.
138v80 10/6/87 Allow signal to break out of linenum scan.
139v81 10/6/87 Allow -b to be changed from within less.
140v82 10/7/87 Add cmd_decode to use a table for key
141 binding (thanks to Dav id Nason).
142v83 10/9/87 Allow .less file for user-defined keys.
143v84 10/11/87 Fix -e/-E problems (thanks to Felix Lee).
144v85 10/15/87 Search now keeps track of line numbers.
145v86 10/20/87 Added -B option and autobuf; fixed
146 "pipe error" bug.
147v87 3/1/88 Fix bug re BSD signals while reading file.
148v88 3/12/88 Use new format for -P option (thanks to
149 der Mouse), allow "+-c" without message,
150 fix bug re BSD hangup.
151v89 3/18/88 Turn off line numbers if linenum scan
152 is interrupted.
153v90 3/30/88 Allow -P from within less.
154v91 3/30/88 Added tags file support (new -t option)
155 (thanks to Brian Campbell).
156v92 4/4/88 Added -+option syntax.
157v93 4/11/88 Add support for slow input (thanks to
158 Joe Orost & apologies for taking almost
159 3 years to get this in!)
160v94 4/11/88 Redo reading/signal stuff.
161v95 4/20/88 Repaint screen better after signal.
162v96 4/21/88 Add /! and ?! commands.
163v97 5/17/88 Allow -l/-L from within less.
164 Eliminate some static arrays (use calloc).
165 Posted to USENET.
166-----------------------------------------------------------------
167v98 10/14/88 Fix incorrect calloc call; uninitialized
168 var in exec_mca; core dump on unknown TERM.
169 Make v cmd work if past last line of file.
170 Fix some signal bugs.
171v99 10/29/88 Allow space between -X and string,
172 when X is a string-valued option.
173v100 1/5/89 Fix globbing bug when $SHELL not set;
174 allow spaces after -t command.
175v101 1/6/89 Fix problem with long (truncated) lines
176 in tags file (thanks to Neil Dixon).
177v102 1/6/89 Fix bug with E# when no prev file;
178 allow spaces after -l command.
179v103 3/14/89 Add -N, -f and -? options. Add z and w
180 commands. Add %L for prompt strings.
181v104 3/16/89 Added EDITPROTO.
182v105 3/20/89 Fix bug in find_linenum which cached
183 incorrectly on long lines.
184v106 3/31/89 Added -k option and multiple lesskey
185 files.
186v107 4/27/89 Add 8-bit char support and -g option.
187 Split option code into 3 files.
188v108 5/5/89 Allocate position table dynamically
189 (thanks to Paul Eggert); change % command
190 from "percent" to vi-style brace finder.
191v109 5/10/89 Added ESC-% command, split prim.c.
192v110 5/24/89 Fixed bug in + option; fixed repaint bug
193 under Sun windows (thanks to Paul Eggert).
194v111 5/25/89 Generalized # and % expansion; use
195 calloc for some error messages.
196v112 5/30/89 Get rid of ESC-%, add {}()[] commands.
197v113 5/31/89 Optimize lseeks (thanks to Paul Eggert).
198v114 7/25/89 Added ESC-/ and ESC-/! commands.
199v115 7/26/89 Added ESC-n command.
200v116 7/31/89 Added find_pos to optimize g command.
201v117 8/1/89 Change -f option to -r.
202v118 8/2/89 Save positions for all previous files,
203 not just the immediately previous one.
204v119 8/7/89 Save marks across file boundaries.
205 Add file handle stuff.
206v120 8/11/89 Add :ta command.
207v121 8/16/89 Add -f option.
208v122 8/30/89 Fix performance with many buffers.
209v123 8/31/89 Verbose prompts for string options.
210 Posted beta to USENET.
211-----------------------------------------------------------------
212v124 9/18/89 Reorganize search commands,
213 N = rev, ESC-n = span, add ESC-N.
214v125 9/18/89 Fix tab bug (thanks to Alex Liu).
215 Fix EOF bug when both -w and -c.
216v126 10/25/89 Add -j option.
217v127 10/27/89 Fix problems with blank lines before BOF.
218v128 10/27/89 Add %bj, etc. to prompt strings.
219v129 11/3/89 Add -+,-- commands; add set-option and
220 unset-option to lesskey.
221v130 11/6/89 Generalize A_EXTRA to string, remove
222 set-option, unset-option from lesskey.
223v131 11/7/89 Changed name of EDITPROTO to LESSEDIT.
224v132 11/8/89 Allow editing of command prefix.
225v133 11/16/89 Add -y option (thanks to Jeff Sullivan).
226v134 12/1/89 Glob filenames in the -l command.
227v135 12/5/89 Combined {}()[] commands into one, and
228 added ESC-^F and ESC-^B commands.
229v136 1/20/90 Added -S, -R flags. Added | command.
230 Added warning for binary files. (thanks
231 to Richard Brittain and J. Sullivan).
232v137 1/21/90 Rewrote horrible pappend code.
233 Added * notation for hi-bit chars.
234v138 1/24/90 Fix magic cookie terminal handling.
235 Get rid of "cleanup" loop in ch_get.
236v139 1/27/90 Added MSDOS support. (many thanks
237 to Richard Brittain).
238v140 2/7/90 Editing a new file adds it to the
239 command line list.
240v141 2/8/90 Add edit_list for editing >1 file.
241v142 2/10/90 Add :x command.
242v143 2/11/90 Add * and @ modifies to search cmds.
243 Change ESC-/ cmd from /@* to / *.
244v144 3/1/90 Messed around with ch_zero;
245 no real change.
246v145 3/2/90 Added -R and -v/-V for MSDOS;
247 renamed FILENAME to avoid conflict.
248v146 3/5/90 Pull cmdbuf functions out of command.c
249v147 3/7/90 Implement ?@; fix multi-file edit bugs.
250v148 3/29/90 Fixed bug in :e<file> then :e#.
251v149 4/3/90 Change error,ierror,query to use PARG.
252v150 4/6/90 Add LESS_CHARSET, LESS_CHARDEF.
253v151 4/13/90 Remove -g option; clean up ispipe.
254v152 4/14/90 lsystem() closes input file, for
255 editors which require exclusive open.
256v153 4/18/90 Fix bug if SHELL unset;
257 fix bug in overstrike control char.
258v154 4/25/90 Output to fd 2 via buffer.
259v155 4/30/90 Ignore -i if uppercase in pattern
260 (thanks to Michael Rendell.)
261v156 5/3/90 Remove scroll limits in forw() & back();
262 causes problems with -c.
263v157 5/4/90 Forward search starts at next real line
264 (not screen line) after jump target.
265v158 6/14/90 Added F command.
266v159 7/29/90 Fix bug in exiting: output not flushed.
267v160 7/29/90 Clear screen before initial output w/ -c.
268v161 7/29/90 Add -T flag.
269v162 8/14/90 Fix bug with +F on command line.
270v163 8/21/90 Added LESSBINFMT variable.
271v164 9/5/90 Added -p, LINES, COLUMNS and
272 unset mark ' == BOF, for 1003.2 D5.
273v165 9/6/90 At EOF with -c set, don't display empty
274 screen when try to page forward.
275v166 9/6/90 Fix G when final line in file wraps.
276v167 9/11/90 Translate CR/LF -> LF for 1003.2.
277v168 9/13/90 Return to curr file if "tag not found".
278v169 12/12/90 G goes to EOF even if file has grown.
279v170 1/17/91 Add optimization for BSD _setjmp;
280 fix #include ioctl.h TERMIO problem.
281 (thanks to Paul Eggert)
282 Posted to USENET.
283-----------------------------------------------------------------
284v171 3/6/91 Fix -? bug in get_filename.
285v172 3/15/91 Fix G bug in empty file.
286 Fix bug with ?\n and -i and uppercase
287 pattern at EOF!
288 (thanks to Paul Eggert)
289v173 3/17/91 Change N cmd to not permanently change
290 direction. (thanks to Brian Matthews)
291v174 3/18/91 Fix bug with namelogfile not getting
292 cleared when change files.
293v175 3/18/91 Fix bug with ++cmd on command line.
294 (thanks to Jim Meyering)
295v176 4/2/91 Change | to not force current screen,
296 include marked line, start/end from
297 top of screen. Improve search speed.
298 (thanks to Don Mears)
299v177 4/2/91 Add LESSHELP variable.
300 Fix bug with F command with -e.
301 Try /dev/tty for input before using fd 2.
302 Patches posted to USENET 4/2/91.
303-----------------------------------------------------------------
304v178 4/8/91 Fixed bug in globbing logfile name.
305 (thanks to Jim Meyering)
306v179 4/9/91 Allow negative -z for screen-relative.
307v180 4/9/91 Clear to eos rather than eol if "db";
308 don't use "sr" if "da".
309 (thanks to Tor Lillqvist)
310v181 4/18/91 Fixed bug with "negative" chars 80 - FF.
311 (thanks to Benny Sander Hofmann)
312v182 5/16/91 Fixed bug with attribute at EOL.
313 (thanks to Brian Matthews)
314v183 6/1/91 Rewrite linstall to do smart config.
315v184 7/11/91 Process \b in searches based on -u
316 rather than -i.
317v185 7/11/91 -Pxxx sets short prompt; assume SIGWINCH
318 after a SIGSTOP. (thanks to Ken Laprade)
319-----------------------------------------------------------------
320v186 4/20/92 Port to MS-DOS (Microsoft C).
321v187 4/23/92 Added -D option & TAB_COMPLETE_FILENAME.
322v188 4/28/92 Added command line editing features.
323v189 12/8/92 Fix mem overrun in anscreen.c:init;
324 fix edit_list to recover from bin file.
325v190 2/13/93 Make TAB enter one filename at a time;
326 create ^L with old TAB functionality.
327v191 3/10/93 Defer creating "flash" page for MS-DOS.
328v192 9/6/93 Add BACK-TAB.
329v193 9/17/93 Simplify binary_file handling.
330v194 1/4/94 Add rudiments of alt_filename handling.
331v195 1/11/94 Port back to Unix; support keypad.
332-----------------------------------------------------------------
333v196 6/7/94 Fix bug with bad filename; fix IFILE
334 type problem. (thanks to David MacKenzie)
335v197 6/7/94 Fix bug with .less tables inserted wrong.
336v198 6/23/94 Use autoconf installation technology.
337 (thanks to David MacKenzie)
338v199 6/29/94 Fix MS-DOS build (thanks to Tim Wiegman).
339v200 7/25/94 Clean up copyright, minor fixes.
340 Posted to prep.ai.mit.edu
341-----------------------------------------------------------------
342v201 7/27/94 Check for no memcpy; add casts to calloc;
343 look for regcmp in libgen.a.
344 (thanks to Kaveh Ghazi).
345v202 7/28/94 Fix bug in edit_next/edit_prev with
346 non-existant files.
347v203 8/2/94 Fix a variety of configuration bugs on
348 various systems. (thanks to Sakai
349 Kiyotaka, Harald Koenig, Bjorn Brox,
350 Teemu Rantanen, and Thorsten Lockert)
351v204 8/3/94 Use strerror if available.
352 (thanks to J.T. Conklin)
353v205 8/5/94 Fix bug in finding "me" termcap entry.
354 (thanks to Andreas Stolcke)
3558/10/94 v205+: Change BUFSIZ to LBUFSIZE to avoid name
356 conflict with stdio.h.
357 Posted to prep.ai.mit.edu
358-----------------------------------------------------------------
359v206 8/10/94 Use initial_scrpos for -t to avoid
360 displaying first page before init().
361 (thanks to Dominique Petitpierre)
362v207 8/12/94 Fix bug if stdout is not tty.
363v208 8/16/94 Fix bug in close_altfile if goto err1
364 in edit_ifile. (Thanks to M.J. Hewitt)
365v209 8/16/94 Change scroll to wscroll to avoid
366 conflict with library function.
367v210 8/16/94 Fix bug with bold on 8 bit chars.
368 (thanks to Vitor Duarte)
369v211 8/16/94 Don't quit on EOI in jump_loc / forw.
370v212 8/18/94 Use time_t if available.
371v213 8/20/94 Allow ospeed to be defined in termcap.h.
372v214 8/20/94 Added HILITE_SEARCH, -F, ESC-u cmd.
373 (thanks to Paul Lew and Bob Byrnes)
374v215 8/23/94 Fix -i toggle behavior.
375v216 8/23/94 Process BS in all searches, not only -u.
376v217 8/24/94 Added -X flag.
377v218 8/24/94 Reimplement undo_search.
378v219 8/24/94 Find tags marked with line number
379 instead of pattern.
380v220 8/24/94 Stay at same position after SIG_WINCH.
381v221 8/24/94 Fix bug in file percentage in big file.
382v222 8/25/94 Do better if can't reopen current file.
383v223 8/27/94 Support setlocale.
384 (thanks to Robert Joop)
385v224 8/29/94 Revert v216: process BS in search
386 only if -u.
387v225 9/6/94 Rewrite undo_search again: toggle.
388v226 9/15/94 Configuration fixes.
389 (thanks to David MacKenzie)
390v227 9/19/94 Fixed strerror config problem.
391 Posted to prep.ai.mit.edu
392-----------------------------------------------------------------
393v228 9/21/94 Fix bug in signals: repeated calls to
394 get_editkeys overflowed st_edittable.
395v229 9/21/94 Fix "Nothing to search" error if -a
396 and SRCH_PAST_EOF.
397v230 9/21/94 Don't print extra error msg in search
398 after regerror().
399v231 9/22/94 Fix hilite bug if search matches 0 chars.
400 (thanks to John Polstra)
401v232 9/23/94 Deal with weird systems that have
402 termios.h but not tcgetattr().
403 Posted to prep.ai.mit.edu
404-----------------------------------------------------------------
405v233 9/26/94 Use get_term() instead of pos_init() in
406 psignals to re-get lower_left termcap.
407 (Thanks to John Malecki)
408v234 9/26/94 Make MIDDLE closer to middle of screen.
409v235 9/27/94 Use local strchr if system doesn't have.
410v236 9/28/94 Don't use libucb; use libterm if
411 libtermcap & libcurses doesn't work.
412 (Fix for Solaris; thanks to Frank Kaefer)
413v237 9/30/94 Use system isupper() etc if provided.
414 Posted to prep.ai.mit.edu
415-----------------------------------------------------------------
416v238 10/6/94 Make binary non-blinking if LESSBINFMT
417 is set to a string without a *.
418v239 10/7/94 Don't let delimit_word run back past
419 beginning of cmdbuf.
420v240 10/10/94 Don't write into termcap buffer.
421 (Thanks to Benoit Speckel)
422v241 10/13/94 New lesskey file format.
423 Don't expand filenames in search command.
424v242 10/14/94 Allow lesskey specification of "literal".
425v243 10/14/94 Add #stop command to lesskey.
426v244 10/16/94 Add -f flag to lesskey.
427v245 10/25/94 Allow TAB_COMPLETE_FILENAME to be undefd.
428v246 10/27/94 Move help file to /usr/local/share.
429v247 10/27/94 Add -V option.
430v248 11/5/94 Add -V option to lesskey.
431v249 11/5/94 Remove -f flag from lesskey; default
432 input file is ~/.lesskey.in, not stdin.
433v250 11/7/94 Lesskey input file "-" means stdin.
434v251 11/9/94 Convert cfgetospeed result to ospeed.
435 (Thanks to Andrew Chernov)
436v252 11/16/94 Change default lesskey input file from
437 .lesskey.in to .lesskey.
438 Posted to prep.ai.mit.edu
439-----------------------------------------------------------------
440v253 11/21/94 Fix bug when tags file has a backslash.
441v254 12/6/94 Fix -k option.
442v255 12/8/94 Add #define EXAMINE to disable :e etc.
443v256 12/10/94 Change highlighting: only highlite search
444 results (but now it is reliable).
445v257 12/10/94 Add goto_line and repaint_highlight
446 to optimize highlight repaints.
447v258 12/12/94 Fixup in hilite_line if BS_SPECIAL.
448v259 12/12/94 Convert to autoconf 2.0.
449v260 12/13/94 Add SECURE define.
450v261 12/14/94 Use system WERASE char as EC_W_BACKSPACE.
451v262 12/16/94 Add -g/-G flag and screen_hilite.
452v263 12/20/94 Reimplement/optimize -G flag behavior.
453v264 12/23/94 Allow EXTRA string after line-edit cmd
454 in lesskey file.
455v265 12/24/94 Add LESSOPEN=|cmd syntax.
456v266 12/26/94 Add -I flag.
457v267 12/28/94 Formalize the four-byte header emitted
458 by a LESSOPEN pipe.
459v268 12/28/94 Get rid of four-byte header.
460v269 1/2/95 Close alt file before open new one.
461 Avoids multiple popen().
462v270 1/3/95 Use VISUAL; use S_ISDIR/S_ISREG; fix
463 config problem with Solaris POSIX regcomp.
464v271 1/4/95 Don't quit on read error.
465v272 1/5/95 Get rid of -L.
466v273 1/6/95 Fix ch_ungetchar bug; don't call
467 LESSOPEN on a pipe.
468v274 1/6/95 Ported to OS/2 (thanks to Kai Uwe Rommel)
469v275 1/18/95 Fix bug if toggle -G at EOF.
470v276 1/30/95 Fix OS/2 version.
471v277 1/31/95 Add "next" charset; don't display ^X
472 for X > 128.
473v278 2/14/95 Change default for -G.
474 Posted to prep.ai.mit.edu
475-----------------------------------------------------------------
476v279 2/22/95 Add GNU options --help, --version.
477 Minor config fixes.
478v280 2/24/95 Clean up calls to glob(); don't set #
479 if we can't open the new file.
480v281 2/24/95 Repeat search should turn on hilites.
481v282 3/2/95 Minor fixes.
482v283 3/2/95 Fix homefile; make OS2 look in $HOME.
483v284 3/2/95 Error if "v" on LESSOPENed file;
484 "%" figures out file size on pipe.
485v285 3/7/95 Don't set # in lsystem;
486 lesskey try $HOME first.
487v286 3/7/95 Reformat change history (too much free time?).
488v287 3/8/95 Fix hilite bug if overstrike multiple chars.
489v288 3/8/95 Allow lesskey to override get_editkey keys.
490v289 3/9/95 Fix adj_hilite bug when line gets processed by
491 hilite_line more than once.
492v290 3/9/95 Make configure automatically. Fix Sequent problem
493 with incompatible sigsetmask().
494 Posted to prep.ai.mit.edu
495-----------------------------------------------------------------
496v291 3/21/95 Add #env to lesskey. Fix MS-DOS build.
497 Posted to simtel.
498-----------------------------------------------------------------
499v292 4/24/95 Add MS-DOS support for Borland C.
500 Fix arrow keys in MS-DOS versions.
501v293 4/28/95 Add auto-versioning stuff to make dist.
502v294 5/12/95 Fix Borland build.
503v295 1/20/96 Fix search on squished file; add /@@.
504v296 1/23/96 Allow cmdbuf larger than screen width.
505v297 1/24/96 Don't call termcap if tgetent fails;
506 add #defines for buffers.
507v298 1/24/96 Change @@ to ^K.
508 Add alternate search modifiers ^N, ^F, ^E.
509v299 1/25/96 Fix percent overflow in jump_percent (thanks to Brent Wiese);
510 don't send "ti" after shell command till RETURN pressed.
511v300 1/25/96 Change -U to print tabs as ^I.
512v301 1/30/96 Make hilites work in cmd F output.
513v302 1/31/96 Fix cmd F to notice window-change signals.
514v303 1/31/96 Add ESC-SPACE command.
515v304 2/1/96 Add ^R search modifier; add LESSSECURE.
516v305 2/2/96 Workaround Linux /proc kernel bug; add LESSKEY.
517v306 3/16/96 Minor fixes.
518v307 3/25/96 Allow cmd line arg "--"; fix DOS & OS/2 defines.h.
519v308 4/4/96 Port to OS-9 (thanks to Boisy Pitre); fix -d.
520v309 4/9/96 Fix OS-9 version; fix tags bug with "$".
521v310 4/10/96 Get rid of HELPFILE.
522v311 4/22/96 Add Windows32 support; merge doscreen.c into screen.c.
523v312 4/24/96 Don't quit after "cannot reopen" error.
524v313 4/25/96 Added horizontal scrolling.
525v314 4/26/96 Modified -e to quit on reaching end of a squished file.
526v315 4/26/96 Fix "!;TAB" bug.
527v316 5/2/96 Make "|a" when (a < curr screen) go to end of curr screen.
528v317 5/14/96 Various fixes for the MS-DOS and OS/2 builds.
529 Added ## and %% handling for filenames
530v318 5/29/96 Port to OS-9 Microware compiler; minor fixes
531 (thanks to Martin Gregorie).
532v319 7/8/96 Fix Windows port (thanks to Jeff Paquette).
533v320 7/11/96 Final fixes for Windows port.
534v321 7/18/96 Minor fixes.
535 Posted to Web page.
536-----------------------------------------------------------------
537v322 8/13/96 Fix bug in shell escape from help file; add support for
538 Microsoft Visual C under Windows; numerous small fixes.
539v323 8/19/96 Fixes for Windows version (thanks to Simon Munton);
540 fix for Linux library weirdness (thanks to Jim Diamond);
541 port to DJGPP (thanks to Eli Zaretskii).
542v324 8/21/96 Add support for spaces in filenames (thanks to Simon Munton).
543v325 8/21/96 Add lessecho, for spaces in filenames under Unix.
544v326 8/27/96 Fix DJGPP version.
545v327 9/1/96 Reorganize lglob, make spaces in filenames work better in Unix.
546v328 10/7/96 Append / to directory name in filename completion.
547 Fix MS-DOS and OS-9 versions.
548v329 10/11/96 Fix more MS-DOS bugs; add LESSSEPARATOR; add -" option.
549 Add LESSMETACHARS, LESSMETAESCAPE.
550v330 10/21/96 Minor fixes.
551 Posted to Web page.
552-----------------------------------------------------------------
553v331 4/22/97 Various Windows fixes (thanks to Gurusamy Sarathy).
554v332 4/22/97 Enter filenames from cmd line into edit history.
555 Posted to Web page.
556-----------------------------------------------------------------
557v333 3/4/99 Changed -w to highlite new line after forward movement.
558v334 3/9/99 Avoid overflowing prompt buffer; add %d and %D.
559v335 3/20/99 Add EBCDIC support (thanks to Thomas Dorner).
560 Use HOMEDRIVE/HOMEPATH on Windows (thanks to Preston Bannister).
561 Posted to Web page.
562-----------------------------------------------------------------
563v336 4/8/99 Fix installation bugs.
564v337 4/9/99 Fix another installation bug.
565 Posted to Web page.
566-----------------------------------------------------------------
567v338 4/13/99 Add support for long option names.
568v339 4/18/99 Add \k, long option names to lesskey. Add -^P. Add :d.
569v340 4/21/99 Add regexec2. Fix Windows build.
570 Posted to Web page.
571-----------------------------------------------------------------
572v341 5/6/99 Add -F option; %c & ?c prompt escapes.
573 (Thanks to Michele Maltoni)
574v342 7/22/99 Add system-wide lesskey file; allow GPL or Less License.
575v343 9/23/99 Support UTF-8 (Thanks to Robert Brady).
576 Add %P and ?P in prompts.
577v344 10/27/99 -w highlights target line of g and p commands.
578v345 10/29/99 Make -R pass thru ESC but not other control chars.
579 Posted to Web page.
580-----------------------------------------------------------------
581v346 11/4/99 Fix bugs in long option processing; R cmd should clear hilites.
582 Posted to Web page.
583-----------------------------------------------------------------
584v347 12/13/99 Fixes for DJGPP version (thanks to Eli Zaretskii).
585v348 12/28/99 Fix deleting file with marks (thanks to Dimitar Jekov).
586 Fix color problem in DJGPP version (thanks to Eli Zaretskii).
587v349 1/24/00 Fix minor DJGPP bugs; check environment vars for UTF-8;
588 add --with-editor (thanks to Eli, Markus Kuhn, Thomas Schoepf).
589v350 3/1/00 Fix clear-while-standout bug.
590v351 3/5/00 Change -M and = prompts to show top & bottom line number.
591 Posted to Web page.
592-----------------------------------------------------------------
593v352 3/8/00 Fix scan_option NULL dereference.
594-----------------------------------------------------------------
595v353 3/20/00 Fix SECURE compile bug, allow space after numeric option.
596v354 3/23/00 Add support for PCRE; add --with-regex configure option.
597-----------------------------------------------------------------
598v355 6/28/00 Add -# option (thanks to Andy Levinson).
599v356 7/5/00 Add -J option.
600v357 7/6/00 Support sigprocmask.
601-----------------------------------------------------------------
602v358 7/8/00 Fix problems with #stop in lesskey file.
603 Posted to Web page.
604-----------------------------------------------------------------
605v359 9/10/00 Fixes for Win32 display problems (thanks to Maurizio Vairani).
606v360 1/17/01 Move sysless to etc.
607v361 12/4/01 Add IBM-1047 charset & EBCDIC fixes (thanks to Thomas Dorner).
608 Fix 32 bit dependencies (thanks to Paul Eggert).
609 Fix UTF-8 overstriking (thanks to Robert Brady).
610v362 12/4/01 Make status column show search targets.
611v363 12/6/01 Add --no-keypad option.
612 Add variable width tabstops (thanks to Peter Samuelson).
613v364 12/10/01 Better handling of very long lines in input;
614 Fix horizontal shifting of colored text.
615v365 12/11/01 Fix overstriking of tabs;
616 Add support for global(1) and multiple tag matches
617 (thanks to Shigio Yamaguchi and Tim Vanderhoek).
618v366 12/11/01 Fixes for OS/2 (thanks to Kyosuke Tokoro).
619v367 12/13/01 Allow -D and -x options to terminate without dollar sign;
620 Right/left arrow when entering N are shift cmds, not line edit.
621v368 12/18/01 Update lesskey commands.
622v370 12/23/01 Fix tags error messages.
623 Posted to Web page.
624-----------------------------------------------------------------
625v371 12/26/01 Fix new_file bug; use popen in Windows version;
626 fix some compiler warnings.
627v372 12/29/01 Make -b be in units of 1K.
628v373 1/14/02 Improve handling of filenames containing shell metachars.
629v374 2/7/02 Fix memory leak; fix bug in -x argument parsing.
630v375 4/7/02 Fix searching for SGR sequences; fix SECURE build;
631 add SGR support to DJGPP version (thanks to Eli Zaretskii).
632v376 6/10/02 Fix bug in overstriking mulitbyte UTF-8 characters
633 (thanks to Jungshik Shin).
634 Posted to Web page.
635-----------------------------------------------------------------
636v377 9/10/02 Fix bug in Windows version when file contains CR;
637 fix bug in search highlights with -R;
638 make initial buffer limit really be 64K not unlimited.
639v378 9/30/02 Misc bug fixes and compiler warning cleanup.
640 Posted to Web page.
641-----------------------------------------------------------------
642v379 11/23/02 Add -L option; fix bug with ctrl-K in lesskey files;
643 improve UTF-8 overstriking and underscore overstriking;
644 fix minor man page problems; change to autoconf 2.54.
645v380 11/24/02 Make LINENUM same as POSITION.
646v381 11/28/02 Make -N use 7 columns for line number if possible.
647-----------------------------------------------------------------
648v382 2/3/04 Remove copyrighted code.
649-----------------------------------------------------------------
650v383 2/16/04 Add history file; add -K option; improve UTF-8 handling;
651 fix some signed char bugs (thanks to Christian Biere);
652 fix some upper/lower case bugs (thanks to Bjoern Jacke);
653 add erase2 char (thanks to David Lawrence);
654 add windows charset (thanks to Dimitar Zhekov).
655v384 2/20/04 Improvements in UTF-8 handling.
656v385 2/23/04 Fix UTF-8 output bug.
657-----------------------------------------------------------------
658v386 9/13/05 Improvements to UTF-8 shift & color (thanks to Charles Levert);
659 protect against invalid LESSOPEN and LESSCLOSE values.
660v387 9/14/05 Update Charles Levert's UTF-8 patch.
661v388 9/14/05 Change history behavior; change most sprintf calls to snprintf.
662v389 9/14/05 Fix copy & paste with long lines; improve performance of
663 expand_linebuf; fix crash in init_mlist;
664v390 9/15/05 Show search matches in status column even if -G is set.
665-----------------------------------------------------------------
666v391 9/17/05 Fix bugs.
667v392 10/14/05 Fix line wrapping bug.
668v393 10/19/05 Allow multiple attributes per char; fix bold+underline bug
669 (thanks again to Charles Levert).
670v394 11/8/05 Fix prompt bug; fix compile problem in Windows build.
671-----------------------------------------------------------------
672v395 1/12/07 Update Unicode tables (thanks to Charles Levert);
673 don't chmod if LESSHISTFILE = /dev/null;
674 make -f work for directories; support DESTDIR in Makefile;
675 fix sigset_t detection in configure;
676 make "t" cmd traverse tags in correct order
677v396 1/13/07 Add compatibility with POSIX more.
678v397 3/21/07 Allow decimal point in number for % command;
679 Allow decimal point in number for -j option;
680 Allow n command to fetch last search pattern from history
681 (thanks to arno).
682v398 3/22/07 Don't rewrite history file if not necessary;
683 fix bug when filenames contain "$".
684v399 3/22/07 Don't move to bottom of screen at startup;
685 don't output extraneous newlines.
686v400 3/23/07 Allow search to find pattern after null byte (PCRE and no-regex)
687 (thanks to Michael Constant).
688-----------------------------------------------------------------
689v401 3/24/07 Minor documentation fixes.
690v402 3/30/07 Fix autoconf bug when memcpy etc are inline;
691 fix bug in terminating number following -j option.
692v403 5/25/07 Fix Windows build.
693v404 6/5/07 Fix display bug with F command and long lines.
694v405 6/17/07 Fix display bug when using -w option.
695v406 6/17/07 Fix secure build.
696v407 8/16/07 Fix bugs; support CSI chars.
697v408 10/1/07 Fix bug in -i with non-ASCII chars.
698v409 10/12/07 Fix crash when viewing text with invalid UTF-8 sequences.
699v411 11/6/07 Fix case-insensitive searching with non-ASCII text.
700v412 11/6/07 Use symbolic SEEK constants.
701v413 11/6/07 Fix search highlight bug with non-ASCII text.
702v414 11/6/07 Fix display bug with no-wrap terminals.
703v415 11/14/07 Add --follow-name option.
704v416 11/22/07 Fix crash when searching text with invalid UTF-8 sequences.
705v417 12/31/07 Don't support single-char CSI in UTF-8 mode;
706 fix bug with -R and invalid CSI sequences;
707 fix bug searching text with SGR sequences with -r;
708 emulate SGR sequences in WIN32 build.
709v418 12/31/07 Clean up.
710-----------------------------------------------------------------
711v419 1/16/08 Make CSI char 0x9B work in UTF-8 mode (thanks to Colin Watson).
712v420 2/24/08 Add & command; fix -F option; fix '' after G.
713v421 2/24/08 Ignore filtered lines when searching.
714v422 3/2/08 Output CR at startup.
715v423 5/27/08 Clean up.
716v424 6/16/08 Fix compile bug with pcre; don't filter help file.
717v425 7/14/08 Fix non-ANSI code in list handling in ch.c.
718v426 10/27/08 Fix ignaw terminal handling (thanks to Per Hedeland);
719 fix binary file detection in UTF-8 mode.
720v427 3/16/09 A few Win32 fixes (thanks to Jason Hood).
721v428 3/30/09 Add "|-" syntax to LESSOPEN.
722v429 4/10/09 Fix search highlighting bug with underlined text.
723*/
724
725char version[] = "429";