version.c

早期freebsd实现

 *	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.
 */

char version[] = "@(#) less  version 177";