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version.c
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/*
* Copyright (c) 1984,1985,1989,1994 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 --------------------------
*
* Allowed use on standard input 1/29/84 markn
* Added E, N, P commands 2/1/84 markn
* Added '=' command, 'stop' signal handling 4/17/84 markn
* Added line folding 4/20/84 markn
* v2: Fixed '=' command to use BOTTOM_PLUS_ONE,
* instead of TOP, added 'p' & 'v' commands 4/27/84 markn
* v3: Added -m and -t options, '-' command 5/3/84 markn
* v4: Added LESS environment variable 5/3/84 markn
* v5: New comments, fixed '-' command slightly 5/3/84 markn
* v6: Added -Q, visual bell 5/15/84 markn
* v7: Fixed jump_back(n) bug: n should count real
* lines, not folded lines. Also allow number
* on G command. 5/24/84 markn
* v8: Re-do -q and -Q commands 5/30/84 markn
* v9: Added "+<cmd>" argument 9/25/84 markn
* v10: Fixed bug in -b<n> argument processing 10/10/84 markn
* v11: Made error() ring bell if \n not entered. 10/18/84 markn
* -----------------------------------------------------------------
* v12: Reorganized signal handling and made
* portable to 4.2bsd. 2/13/85 mark
* v13: Reword error message for '-' command. 2/16/85 mark
* v14: Added -bf and -bp variants of -b. 2/22/85 mark
* v15: Miscellaneous changes. 2/25/85 mark
* v16: Added -u flag for backspace processing. 3/13/85 mark
* v17: Added j and k commands,
* changed -t default. 4/13/85 mark
* v18: Rewrote signal handling code. 4/20/85 mark
* v19: Got rid of "verbose" eq_message(). 5/2/85 mark
* Made search() scroll in some cases.
* v20: Fixed screen.c ioctls for System V. 5/21/85 mark
* v21: Fixed some first_cmd bugs. 5/23/85 mark
* v22: Added support for no RECOMP nor REGCMP. 5/24/85 mark
* v23: Miscellanous changes and prettying up. 5/25/85 mark
* Posted to USENET.
* -----------------------------------------------------------------
* v24: Added ti,te terminal init & de-init 6/3/85 Mike Kersenbrock
* v25: Added -U flag, standout mode underlining. 6/8/85 mark
* v26: Added -M flag. 6/9/85 mark
* Use underline termcap (us) if it exists.
* v27: Renamed some variables to make unique in 6/15/85 mark
* 6 chars. Minor fix to -m.
* v28: Fixed right margin bug. 6/28/85 mark
* v29: Incorporated M.Rose's changes to signal.c 6/28/85 mark
* v30: Fixed stupid bug in argument processing. 6/29/85 mark
* v31: Added -p flag, changed repaint algorithm. 7/15/85 mark
* Added kludge for magic cookie terminals.
* v32: Added cat_file if output not a tty. 7/16/85 mark
* v33: Added -e flag and EDITOR. 7/23/85 mark
* v34: Added -s flag. 7/26/85 mark
* v35: Rewrote option handling; added option.c. 7/27/85 mark
* v36: Fixed -e flag to work if not last file. 7/29/85 mark
* v37: Added -x flag. 8/10/85 mark
* v38: Changed prompting; created prompt.c. 8/19/85 mark
* v39: (Not -p) does not initially clear screen. 8/24/85 mark
* v40: Added "skipping" indicator in forw(). 8/26/85 mark
* Posted to USENET.
* -----------------------------------------------------------------
* v41: ONLY_RETURN, control char commands, 9/17/85 mark
* faster search, other minor fixes.
* v42: Added ++ command line syntax; 9/25/85 mark
* ch_fsize for pipes.
* v43: Added -h flag, changed prim.c algorithms. 10/15/85 mark
* v44: Made END print in all cases of eof; 10/16/85 mark
* ignore SIGTTOU after receiving SIGTSTP.
* v45: Never print backspaces unless -u. 10/16/85 mark
* v46: Backwards scroll in jump_loc. 10/24/85 mark
* v47: Fixed bug in edit(): *first_cmd==0 10/30/85 mark
* v48: Use TIOCSETN instead of TIOCSETP. 11/16/85 mark
* Added marks (m and ' commands).
* Posted to USENET.
* -----------------------------------------------------------------
* v49: Fixed bug: signal didn't clear mcc. 1/9/86 mark
* v50: Added ' (quote) to gomark. 1/15/86 mark
* v51: Added + cmd, fixed problem if first_cmd
* fails, made g cmd sort of "work" on pipes
* even if bof is no longer buffered. 1/16/86 mark
* v52: Made short files work better. 1/17/86 mark
* v53: Added -P option. 1/20/86 mark
* v54: Changed help to use HELPFILE. 1/20/86 mark
* v55: Messages work better if not tty output. 1/23/86 mark
* v56: Added -l option. 1/24/86 mark
* v57: Fixed -l to get confirmation before
* overwriting an existing file. 1/31/86 mark
* v58: Added filename globbing. 8/28/86 mark
* v59: Fixed some bugs with very long filenames. 9/15/86 mark
* v60: Incorporated changes from Leith (Casey)
* Leedom for boldface and -z option. 9/26/86 mark
* v61: Got rid of annoying repaints after ! cmd. 9/26/86 mark
* Posted to USENET.
* -----------------------------------------------------------------
* v62: Added is_directory(); change -z default to
* -1 instead of 24; cat-and-exit if -e and
* file is less than a screenful. 12/23/86 mark
* v63: Fixed bug in cat-and-exit if > 1 file. 1/8/87 mark
* v64: Changed puts/putstr, putc/putchr,
* getc/getchr to avoid name conflict with
* stdio functions. 1/12/87 mark
* v65: Allowed '-' command to change NUMBER
* valued options (thanks to Gary Puckering) 1/26/87 mark
* v66: Fixed bug: prepaint should use force=1. 2/13/87 mark
* v67: Added !! and % expansion to ! command. 2/24/87 mark
* v68: Added SIGWINCH and TIOCGWINSZ support;
* changed is_directory to bad_file.
* (thanks to J. Robert Ward) 2/25/87 mark
* v69: Added SIGWIND and WIOCGETD (for Unix PC). 2/25/87 mark
* v70: Changed help cmd from 'h' to 'H'; better
* error msgs in bad_file, errno_message. 3/13/87 mark
* v71: Changed -p to -c, made triple -c/-C
* for clear-eol like more's -c. 5/11/87 mark
* v72: Added -E, -L, use $SHELL in lsystem(). 6/26/87 mark
* (thanks to Steve Spearman)
* v73: Allow Examine "#" for previous file. 6/26/87 mark
* Posted to USENET 8/25/87.
* -----------------------------------------------------------------
* v74: Fix conflict in EOF symbol with stdio.h, 9/18/87 mark
* Make os.c more portable to BSD.
* v75: Fix problems in get_term (thanks to 9/23/87 mark
* Paul Eggert); new backwards scrolling in
* jump_loc (thanks to Marion Hakanson).
* v76: Added -i flag; allow single "!" to 9/23/87 mark
* invoke a shell (thanks to Franco Barber).
* v77: Added -n flag and line number support. 9/24/87 mark
* v78: Fixed problem with prompts longer than 9/25/87 mark
* the screen width.
* v79: Added the _ command. 9/29/87 mark
* v80: Allow signal to break out of linenum scan. 10/6/87 mark
* v81: Allow -b to be changed from within less. 10/6/87 mark
* v82: Add cmd_decode to use a table for key 10/7/87 mark
* binding (thanks to David Nason).
* v83: Allow .less file for user-defined keys. 10/9/87 mark
* v84: Fix -e/-E problems (thanks to Felix Lee). 10/11/87 mark
* v85: Search now keeps track of line numbers. 10/15/87 mark
* v86: Added -B option and autobuf; fixed 10/20/87 mark
* "pipe error" bug.
* v87: Fix bug re BSD signals while reading file. 3/1/88 mark
* v88: Use new format for -P option (thanks to 3/12/88 mark
* der Mouse), allow "+-c" without message,
* fix bug re BSD hangup.
* v89: Turn off line numbers if linenum scan 3/18/88 mark
* is interrupted.
* v90: Allow -P from within less. 3/30/88 mark
* v91: Added tags file support (new -t option) 3/30/88 mark
* (thanks to Brian Campbell).
* v92: Added -+option syntax. 4/4/88 mark
* v93: Add support for slow input (thanks to 4/11/88 mark
* Joe Orost & apologies for taking almost
* 3 years to get this in!)
* v94: Redo reading/signal stuff. 4/11/88 mark
* v95: Repaint screen better after signal. 4/20/88 mark
* v96: Add /! and ?! commands. 4/21/88 mark
* v97: Allow -l/-L from within less. 5/17/88 mark
* Eliminate some static arrays (use calloc).
* Posted to USENET.
* -----------------------------------------------------------------
* v98: Fix incorrect calloc call; uninitialized 10/14/88 mark
* var in exec_mca; core dump on unknown TERM.
* Make v cmd work if past last line of file.
* Fix some signal bugs.
* v99: Allow space between -X and string, 10/29/88 mark
* when X is a string-valued option.
* v100: Fix globbing bug when $SHELL not set; 1/5/89 mark
* allow spaces after -t command.
* v101: Fix problem with long (truncated) lines 1/6/89 mark
* in tags file (thanks to Neil Dixon).
* v102: Fix bug with E# when no prev file; 1/6/89 mark
* allow spaces after -l command.
* v103: Add -N, -f and -? options. Add z and w 3/14/89 mark
* commands. Add %L for prompt strings.
* v104: Added EDITPROTO. 3/16/89 mark
* v105: Fix bug in find_linenum which cached 3/20/89 mark
* incorrectly on long lines.
* v106: Added -k option and multiple lesskey 3/31/89 mark
* files.
* v107: Add 8-bit char support and -g option. 4/27/89 mark
* Split option code into 3 files.
* v108: Allocate position table dynamically 5/5/89 mark
* (thanks to Paul Eggert); change % command
* from "percent" to vi-style brace finder.
* v109: Added ESC-% command, split prim.c. 5/10/89 mark
* v110: Fixed bug in + option; fixed repaint bug 5/24/89 mark
* under Sun windows (thanks to Paul Eggert).
* v111: Generalized # and % expansion; use 5/25/89 mark
* calloc for some error messages.
* v112: Get rid of ESC-%, add {}()[] commands. 5/30/89 mark
* v113: Optimize lseeks (thanks to Paul Eggert). 5/31/89 mark
* v114: Added ESC-/ and ESC-/! commands. 7/25/89 mark
* v115: Added ESC-n command. 7/26/89 mark
* v116: Added find_pos to optimize g command. 7/31/89 mark
* v117: Change -f option to -r. 8/1/89 mark
* v118: Save positions for all previous files, 8/2/89 mark
* not just the immediately previous one.
* v119: Save marks across file boundaries. 8/7/89 mark
* Add file handle stuff.
* v120: Add :ta command. 8/11/89 mark
* v121: Add -f option. 8/16/89 mark
* v122: Fix performance with many buffers. 8/30/89 mark
* v123: Verbose prompts for string options. 8/31/89 mark
* Posted beta to USENET.
* -----------------------------------------------------------------
* v124: Reorganize search commands, 9/18/89 mark
* N = rev, ESC-n = span, add ESC-N.
* v125: Fix tab bug (thanks to Alex Liu). 9/18/89 mark
* Fix EOF bug when both -w and -c.
* v126: Add -j option. 10/25/89 mark
* v127: Fix problems with blank lines before BOF. 10/27/89 mark
* v128: Add %bj, etc. to prompt strings. 10/27/89 mark
* v129: Add -+,-- commands; add set-option and 11/3/89 mark
* unset-option to lesskey.
* v130: Generalize A_EXTRA to string, remove 11/6/89 mark
* set-option, unset-option from lesskey.
* v131: Changed name of EDITPROTO to LESSEDIT. 11/7/89 mark
* v132: Allow editing of command prefix. 11/8/89 mark
* v133: Add -y option (thanks to Jeff Sullivan). 11/16/89 mark
* v134: Glob filenames in the -l command. 12/1/89 mark
* v135: Combined {}()[] commands into one, and 12/5/89 mark
* added ESC-^F and ESC-^B commands.
* v136: Added -S, -R flags. Added | command. 1/20/90 mark
* Added warning for binary files. (thanks
* to Richard Brittain and J. Sullivan).
* v137: Rewrote horrible pappend code. 1/21/90 mark
* Added * notation for hi-bit chars.
* v138: Fix magic cookie terminal handling. 1/24/90 mark
* Get rid of "cleanup" loop in ch_get.
* v139: Added MSDOS support. (many thanks 1/27/90 mark
* to Richard Brittain).
* v140: Editing a new file adds it to the 2/7/90 mark
* command line list.
* v141: Add edit_list for editing >1 file. 2/8/90 mark
* v142: Add :x command. 2/10/90 mark
* v143: Add * and @ modifies to search cmds. 2/11/90 mark
* Change ESC-/ cmd from /@* to / *.
* v144: Messed around with ch_zero; 3/1/90 mark
* no real change.
* v145: Added -R and -v/-V for MSDOS; 3/2/90 mark
* renamed FILENAME to avoid conflict.
* v146: Pull cmdbuf functions out of command.c 3/5/90 mark
* v147: Implement ?@; fix multi-file edit bugs. 3/7/90 mark
* v148: Fixed bug in :e<file> then :e#. 3/29/90 mark
* v149: Change error,ierror,query to use PARG. 4/3/90 mark
* v150: Add LESS_CHARSET, LESS_CHARDEF. 4/6/90 mark
* v151: Remove -g option; clean up ispipe. 4/13/90 mark
* v152: lsystem() closes input file, for 4/14/90 mark
* editors which require exclusive open.
* v153: Fix bug if SHELL unset; 4/18/90 mark
* fix bug in overstrike control char.
* v154: Output to fd 2 via buffer. 4/25/90 mark
* v155: Ignore -i if uppercase in pattern 4/30/90 mark
* (thanks to Michael Rendell.)
* v156: Remove scroll limits in forw() & back(); 5/3/90 mark
* causes problems with -c.
* v157: Forward search starts at next real line 5/4/90 mark
* (not screen line) after jump target.
* v158: Added F command. 6/14/90 mark
* v159: Fix bug in exiting: output not flushed. 7/29/90 mark
* v160: Clear screen before initial output w/ -c. 7/29/90 mark
* v161: Add -T flag. 7/29/90 mark
* v162: Fix bug with +F on command line. 8/14/90 mark
* v163: Added LESSBINFMT variable. 8/21/90 mark
* v164: Added -p, LINES, COLUMNS and 9/5/90 mark
* unset mark ' == BOF, for 1003.2 D5.
* v165: At EOF with -c set, don't display empty 9/6/90 mark
* screen when try to page forward.
* v166: Fix G when final line in file wraps. 9/6/90 mark
* v167: Translate CR/LF -> LF for 1003.2. 9/11/90 mark
* v168: Return to curr file if "tag not found". 9/13/90 mark
* v169: G goes to EOF even if file has grown. 12/12/90 mark
* v170: Add optimization for BSD _setjmp; 1/17/91 mark
* fix #include ioctl.h TERMIO problem.
* (thanks to Paul Eggert)
* Posted to USENET.
* -----------------------------------------------------------------
* v171: Fix -? bug in get_filename. 3/6/91 mark
* v172: Fix G bug in empty file. 3/15/91 mark
* Fix bug with ?\n and -i and uppercase
* pattern at EOF!
* (thanks to Paul Eggert)
* v173: Change N cmd to not permanently change 3/17/91 mark
* direction. (thanks to Brian Matthews)
* v174: Fix bug with namelogfile not getting 3/18/91 mark
* cleared when change files.
* v175: Fix bug with ++cmd on command line. 3/18/91 mark
* (thanks to Jim Meyering)
* v176: Change | to not force current screen, 4/2/91 mark
* include marked line, start/end from
* top of screen. Improve search speed.
* (thanks to Don Mears)
* v177: Add LESSHELP variable. 4/2/91 mark
* Fix bug with F command with -e.
* Try /dev/tty for input before using fd 2.
* Patches posted to USENET 4/2/91.
* -----------------------------------------------------------------
* v178: Fixed bug in globbing logfile name. 4/8/91
* (thanks to Jim Meyering)
* v179: Allow negative -z for screen-relative. 4/9/91
* v180: Clear to eos rather than eol if "db"; 4/9/91
* don't use "sr" if "da".
* (thanks to Tor Lillqvist)
* v181: Fixed bug with "negative" chars 80 - FF. 4/18/91
* (thanks to Benny Sander Hofmann)
* v182: Fixed bug with attribute at EOL. 5/16/91
* (thanks to Brian Matthews)
* v183: Rewrite linstall to do smart config. 6/1/91
* v184: Process \b in searches based on -u 7/11/91
* rather than -i.
* v185: -Pxxx sets short prompt; assume SIGWINCH 7/11/91
* after a SIGSTOP. (thanks to Ken Laprade)
* -----------------------------------------------------------------
* v186: Port to MS-DOS (Microsoft C). 4/20/92
* v187: Added -D option & TAB_COMPLETE_FILENAME. 4/23/92
* v188: Added command line editing features. 4/28/92
* v189: Fix mem overrun in anscreen.c:init; 12/8/92
* fix edit_list to recover from bin file.
* v190: Make TAB enter one filename at a time; 2/13/93
* create ^L with old TAB functionality.
* v191: Defer creating "flash" page for MS-DOS. 3/10/93
* v192: Add BACK-TAB. 9/6/93
* v193: Simplify binary_file handling. 9/17/93
* v194: Add rudiments of alt_filename handling. 1/4/94
* v195: Port back to Unix; support keypad. 1/11/94
* -----------------------------------------------------------------
* v196: Fix bug with bad filename; fix IFILE 6/7/94
* type problem. (thanks to David MacKenzie)
* v197: Fix bug with .less tables inserted wrong. 6/7/94
* v198: Use autoconf installation technology. 6/23/94
* (thanks to David MacKenzie)
* v199: Fix MS-DOS build (thanks to Tim Wiegman). 6/29/94
* v200: Clean up copyright, minor fixes. 7/25/94
* Posted to prep.ai.mit.edu
* -----------------------------------------------------------------
* v201: Check for no memcpy; add casts to calloc; 7/27/94
* look for regcmp in libgen.a.
* (thanks to Kaveh Ghazi).
* v202: Fix bug in edit_next/edit_prev with 7/28/94
* non-existant files.
* v203: Fix a variety of configuration bugs on 8/2/94
* various systems. (thanks to Sakai
* Kiyotaka, Harald Koenig, Bjorn Brox,
* Teemu Rantanen, and Thorsten Lockert)
* v204: Use strerror if available. 8/3/94
* (thanks to J.T. Conklin)
* v205: Fix bug in finding "me" termcap entry. 8/5/94
* (thanks to Andreas Stolcke)
* v205+: Change BUFSIZ to LBUFSIZE to avoid name 8/10/94
* conflict with stdio.h.
* Posted to prep.ai.mit.edu
* -----------------------------------------------------------------
* v206: Use initial_scrpos for -t to avoid 8/10/94
* displaying first page before init().
* (thanks to Dominique Petitpierre)
* v207: Fix bug if stdout is not tty. 8/12/94
* v208: Fix bug in close_altfile if goto err1 8/16/94
* in edit_ifile. (Thanks to M.J. Hewitt)
* v209: Change scroll to wscroll to avoid 8/16/94
* conflict with library function.
* v210: Fix bug with bold on 8 bit chars. 8/16/94
* (thanks to Vitor Duarte)
* v211: Don't quit on EOI in jump_loc / forw. 8/16/94
* v212: Use time_t if available. 8/18/94
* v213: Allow ospeed to be defined in termcap.h. 8/20/94
* v214: Added HILITE_SEARCH, -F, ESC-u cmd. 8/20/94
* (thanks to Paul Lew and Bob Byrnes)
* v215: Fix -i toggle behavior. 8/23/94
* v216: Process BS in all searches, not only -u. 8/23/94
* v217: Added -X flag. 8/24/94
* v218: Reimplement undo_search. 8/24/94
* v219: Find tags marked with line number 8/24/94
* instead of pattern.
* v220: Stay at same position after SIG_WINCH. 8/24/94
* v221: Fix bug in file percentage in big file. 8/24/94
* v222: Do better if can't reopen current file. 8/25/94
* v223: Support setlocale. 8/27/94
* (thanks to Robert Joop)
* v224: Revert v216: process BS in search 8/29/94
* only if -u.
* v225: Rewrite undo_search again: toggle. 9/6/94
* v226: Configuration fixes. 9/15/94
* (thanks to David MacKenzie)
* v227: Fixed strerror config problem. 9/19/94
* Posted to prep.ai.mit.edu
* -----------------------------------------------------------------
* v228: Fix bug in signals: repeated calls to 9/21/94
* get_editkeys overflowed st_edittable.
* v229: Fix "Nothing to search" error if -a 9/21/94
* and SRCH_PAST_EOF.
* v230: Don't print extra error msg in search 9/21/94
* after regerror().
* v231: Fix hilite bug if search matches 0 chars. 9/22/94
* (thanks to John Polstra)
* v232: Deal with weird systems that have 9/23/94
* termios.h but not tcgetattr().
* Posted to prep.ai.mit.edu
* -----------------------------------------------------------------
* v233: Use get_term() instead of pos_init() in 9/26/94
* psignals to re-get lower_left termcap.
* (Thanks to John Malecki)
* v234: Make MIDDLE closer to middle of screen. 9/26/94
* v235: Use local strchr if system doesn't have. 9/27/94
* v236: Don't use libucb; use libterm if 9/28/94
* libtermcap & libcurses doesn't work.
* (Fix for Solaris; thanks to Frank Kaefer)
* v237: Use system isupper() etc if provided. 9/30/94
* Posted to prep.ai.mit.edu
* -----------------------------------------------------------------
* v238: Make binary non-blinking if LESSBINFMT 10/6/94
* is set to a string without a *.
* v239: Don't let delimit_word run back past 10/7/94
* beginning of cmdbuf.
* v240: Don't write into termcap buffer. 10/10/94
* (Thanks to Benoit Speckel)
* v241: New lesskey file format. 10/13/94
* Don't expand filenames in search command.
* v242: Allow lesskey specification of "literal". 10/14/94
* v243: Add #stop command to lesskey. 10/14/94
* v244: Add -f flag to lesskey. 10/16/94
* v245: Allow TAB_COMPLETE_FILENAME to be undefd. 10/25/94
* v246: Move help file to /usr/local/share. 10/27/94
* v247: Add -V option. 10/27/94
* v248: Add -V option to lesskey. 11/5/94
* v249: Remove -f flag from lesskey; default 11/5/94
* input file is ~/.lesskey.in, not stdin.
* v250: Lesskey input file "-" means stdin. 11/7/94
* v251: Convert cfgetospeed result to ospeed. 11/9/94
* (Thanks to Andrew Chernov)
* v252: Change default lesskey input file from 11/16/94
* .lesskey.in to .lesskey.
*/
char version[] = "252";