3 * Copyright (c) 1984,1985,1989 Mark Nudelman
5 * This program may be freely used and/or modified,
6 * with the following provisions:
7 * 1. This notice and the above copyright notice must remain intact.
8 * 2. Neither this program, nor any modification of it,
9 * may be sold for profit without written consent of the author.
11 * ---------------------------------------------------------------
12 * | Special note to the person who ported "less" to the Amiga: |
13 * | If you're going to be vain enough to splash your name on |
14 * | the screen every time someone runs less, you might at |
15 * | least credit the author. |
16 * ---------------------------------------------------------------
18 * This program is a paginator similar to "more",
19 * but allows you to move both forward and backward in the file.
20 * Commands are based on "more" and "vi".
22 * ----------------------- CHANGES ---------------------------------
24 * Allowed use on standard input 1/29/84 markn
25 * Added E, N, P commands 2/1/84 markn
26 * Added '=' command, 'stop' signal handling 4/17/84 markn
27 * Added line folding 4/20/84 markn
28 * v2: Fixed '=' command to use BOTTOM_PLUS_ONE,
29 * instead of TOP, added 'p' & 'v' commands 4/27/84 markn
30 * v3: Added -m and -t options, '-' command 5/3/84 markn
31 * v4: Added LESS environment variable 5/3/84 markn
32 * v5: New comments, fixed '-' command slightly 5/3/84 markn
33 * v6: Added -Q, visual bell 5/15/84 markn
34 * v7: Fixed jump_back(n) bug: n should count real
35 * lines, not folded lines. Also allow number
36 * on G command. 5/24/84 markn
37 * v8: Re-do -q and -Q commands 5/30/84 markn
38 * v9: Added "+<cmd>" argument 9/25/84 markn
39 * v10: Fixed bug in -b<n> argument processing 10/10/84 markn
40 * v11: Made error() ring bell if \n not entered. 10/18/84 markn
41 * -----------------------------------------------------------------
42 * v12: Reorganized signal handling and made
43 * portable to 4.2bsd. 2/13/85 mark
44 * v13: Reword error message for '-' command. 2/16/85 mark
45 * v14: Added -bf and -bp variants of -b. 2/22/85 mark
46 * v15: Miscellaneous changes. 2/25/85 mark
47 * v16: Added -u flag for backspace processing. 3/13/85 mark
48 * v17: Added j and k commands,
49 * changed -t default. 4/13/85 mark
50 * v18: Rewrote signal handling code. 4/20/85 mark
51 * v19: Got rid of "verbose" eq_message(). 5/2/85 mark
52 * Made search() scroll in some cases.
53 * v20: Fixed screen.c ioctls for System V. 5/21/85 mark
54 * v21: Fixed some first_cmd bugs. 5/23/85 mark
55 * v22: Added support for no RECOMP nor REGCMP. 5/24/85 mark
56 * v23: Miscellanous changes and prettying up. 5/25/85 mark
58 * -----------------------------------------------------------------
59 * v24: Added ti,te terminal init & de-init 6/3/85 Mike Kersenbrock
60 * v25: Added -U flag, standout mode underlining. 6/8/85 mark
61 * v26: Added -M flag. 6/9/85 mark
62 * Use underline termcap (us) if it exists.
63 * v27: Renamed some variables to make unique in 6/15/85 mark
64 * 6 chars. Minor fix to -m.
65 * v28: Fixed right margin bug. 6/28/85 mark
66 * v29: Incorporated M.Rose's changes to signal.c 6/28/85 mark
67 * v30: Fixed stupid bug in argument processing. 6/29/85 mark
68 * v31: Added -p flag, changed repaint algorithm. 7/15/85 mark
69 * Added kludge for magic cookie terminals.
70 * v32: Added cat_file if output not a tty. 7/16/85 mark
71 * v33: Added -e flag and EDITOR. 7/23/85 mark
72 * v34: Added -s flag. 7/26/85 mark
73 * v35: Rewrote option handling; added option.c. 7/27/85 mark
74 * v36: Fixed -e flag to work if not last file. 7/29/85 mark
75 * v37: Added -x flag. 8/10/85 mark
76 * v38: Changed prompting; created prompt.c. 8/19/85 mark
77 * v39: (Not -p) does not initially clear screen. 8/24/85 mark
78 * v40: Added "skipping" indicator in forw(). 8/26/85 mark
80 * -----------------------------------------------------------------
81 * v41: ONLY_RETURN, control char commands, 9/17/85 mark
82 * faster search, other minor fixes.
83 * v42: Added ++ command line syntax; 9/25/85 mark
85 * v43: Added -h flag, changed prim.c algorithms. 10/15/85 mark
86 * v44: Made END print in all cases of eof; 10/16/85 mark
87 * ignore SIGTTOU after receiving SIGTSTP.
88 * v45: Never print backspaces unless -u. 10/16/85 mark
89 * v46: Backwards scroll in jump_loc. 10/24/85 mark
90 * v47: Fixed bug in edit(): *first_cmd==0 10/30/85 mark
91 * v48: Use TIOCSETN instead of TIOCSETP. 11/16/85 mark
92 * Added marks (m and ' commands).
94 * -----------------------------------------------------------------
95 * v49: Fixed bug: signal didn't clear mcc. 1/9/86 mark
96 * v50: Added ' (quote) to gomark. 1/15/86 mark
97 * v51: Added + cmd, fixed problem if first_cmd
98 * fails, made g cmd sort of "work" on pipes
99 * even if bof is no longer buffered. 1/16/86 mark
100 * v52: Made short files work better. 1/17/86 mark
101 * v53: Added -P option. 1/20/86 mark
102 * v54: Changed help to use HELPFILE. 1/20/86 mark
103 * v55: Messages work better if not tty output. 1/23/86 mark
104 * v56: Added -l option. 1/24/86 mark
105 * v57: Fixed -l to get confirmation before
106 * overwriting an existing file. 1/31/86 mark
107 * v58: Added filename globbing. 8/28/86 mark
108 * v59: Fixed some bugs with very long filenames. 9/15/86 mark
109 * v60: Incorporated changes from Leith (Casey)
110 * Leedom for boldface and -z option. 9/26/86 mark
111 * v61: Got rid of annoying repaints after ! cmd. 9/26/86 mark
113 * -----------------------------------------------------------------
114 * v62: Added is_directory(); change -z default to
115 * -1 instead of 24; cat-and-exit if -e and
116 * file is less than a screenful. 12/23/86 mark
117 * v63: Fixed bug in cat-and-exit if > 1 file. 1/8/87 mark
118 * v64: Changed puts/putstr, putc/putchr,
119 * getc/getchr to avoid name conflict with
120 * stdio functions. 1/12/87 mark
121 * v65: Allowed '-' command to change NUMBER
122 * valued options (thanks to Gary Puckering) 1/26/87 mark
123 * v66: Fixed bug: prepaint should use force=1. 2/13/87 mark
124 * v67: Added !! and % expansion to ! command. 2/24/87 mark
125 * v68: Added SIGWINCH and TIOCGWINSZ support;
126 * changed is_directory to bad_file.
127 * (thanks to J. Robert Ward) 2/25/87 mark
128 * v69: Added SIGWIND and WIOCGETD (for Unix PC). 2/25/87 mark
129 * v70: Changed help cmd from 'h' to 'H'; better
130 * error msgs in bad_file, errno_message. 3/13/87 mark
131 * v71: Changed -p to -c, made triple -c/-C
132 * for clear-eol like more's -c. 5/11/87 mark
133 * v72: Added -E, -L, use $SHELL in lsystem(). 6/26/87 mark
134 * (thanks to Steve Spearman)
135 * v73: Allow Examine "#" for previous file. 6/26/87 mark
136 * Posted to USENET 8/25/87.
137 * -----------------------------------------------------------------
138 * v74: Fix conflict in EOF symbol with stdio.h, 9/18/87 mark
139 * Make os.c more portable to BSD.
140 * v75: Fix problems in get_term (thanks to 9/23/87 mark
141 * Paul Eggert); new backwards scrolling in
142 * jump_loc (thanks to Marion Hakanson).
143 * v76: Added -i flag; allow single "!" to 9/23/87 mark
144 * invoke a shell (thanks to Franco Barber).
145 * v77: Added -n flag and line number support. 9/24/87 mark
146 * v78: Fixed problem with prompts longer than 9/25/87 mark
148 * v79: Added the _ command. 9/29/87 mark
149 * v80: Allow signal to break out of linenum scan. 10/6/87 mark
150 * v81: Allow -b to be changed from within less. 10/6/87 mark
151 * v82: Add cmd_decode to use a table for key 10/7/87 mark
152 * binding (thanks to David Nason).
153 * v83: Allow .less file for user-defined keys. 10/9/87 mark
154 * v84: Fix -e/-E problems (thanks to Felix Lee). 10/11/87 mark
155 * v85: Search now keeps track of line numbers. 10/15/87 mark
156 * v86: Added -B option and autobuf; fixed 10/20/87 mark
158 * v87: Fix bug re BSD signals while reading file. 3/1/88 mark
159 * v88: Use new format for -P option (thanks to 3/12/88 mark
160 * der Mouse), allow "+-c" without message,
161 * fix bug re BSD hangup.
162 * v89: Turn off line numbers if linenum scan 3/18/88 mark
164 * v90: Allow -P from within less. 3/30/88 mark
165 * v91: Added tags file support (new -t option) 3/30/88 mark
166 * (thanks to Brian Campbell).
167 * v92: Added -+option syntax. 4/4/88 mark
168 * v93: Add support for slow input (thanks to 4/11/88 mark
169 * Joe Orost & apologies for taking almost
170 * 3 years to get this in!)
171 * v94: Redo reading/signal stuff. 4/11/88 mark
172 * v95: Repaint screen better after signal. 4/20/88 mark
173 * v96: Add /! and ?! commands. 4/21/88 mark
174 * v97: Allow -l/-L from within less. 5/17/88 mark
175 * Eliminate some static arrays (use calloc).
177 * -----------------------------------------------------------------
178 * v98: Fix incorrect calloc call; uninitialized 10/14/88 mark
179 * var in exec_mca; core dump on unknown TERM.
180 * Make v cmd work if past last line of file.
181 * Fix some signal bugs.
182 * v99: Allow space between -X and string, 10/29/88 mark
183 * when X is a string-valued option.
184 * v100: Fix globbing bug when $SHELL not set; 1/5/89 mark
185 * allow spaces after -t command.
186 * v101: Fix problem with long (truncated) lines 1/6/89 mark
187 * in tags file (thanks to Neil Dixon).
188 * v102: Fix bug with E# when no prev file; 1/6/89 mark
189 * allow spaces after -l command.
190 * v103: Add -N, -f and -? options. Add z and w 3/14/89 mark
191 * commands. Add %L for prompt strings.
192 * v104: Added EDITPROTO. 3/16/89 mark
193 * v105: Fix bug in find_linenum which cached 3/20/89 mark
194 * incorrectly on long lines.
195 * v106: Added -k option and multiple lesskey 3/31/89 mark
197 * v107: Add 8-bit char support and -g option. 4/27/89 mark
198 * Split option code into 3 files.
199 * v108: Allocate position table dynamically 5/5/89 mark
200 * (thanks to Paul Eggert); change % command
201 * from "percent" to vi-style brace finder.
202 * v109: Added ESC-% command, split prim.c. 5/10/89 mark
203 * v110: Fixed bug in + option; fixed repaint bug 5/24/89 mark
204 * under Sun windows (thanks to Paul Eggert).
205 * v111: Generalized # and % expansion; use 5/25/89 mark
206 * calloc for some error messages.
207 * v112: Get rid of ESC-%, add {}()[] commands. 5/30/89 mark
208 * v113: Optimize lseeks (thanks to Paul Eggert). 5/31/89 mark
209 * v114: Added ESC-/ and ESC-/! commands. 7/25/89 mark
210 * v115: Added ESC-n command. 7/26/89 mark
211 * v116: Added find_pos to optimize g command. 7/31/89 mark
212 * v117: Change -f option to -r. 8/1/89 mark
213 * v118: Save positions for all previous files, 8/2/89 mark
214 * not just the immediately previous one.
215 * v119: Save marks across file boundaries. 8/7/89 mark
216 * Add file handle stuff.
217 * v120: Add :ta command. 8/11/89 mark
218 * v121: Add -f option. 8/16/89 mark
219 * v122: Fix performance with many buffers. 8/30/89 mark
220 * v123: Verbose prompts for string options. 8/31/89 mark
221 * Posted beta to USENET.
222 * -----------------------------------------------------------------
223 * v124: Reorganize search commands, 9/18/89 mark
224 * N = rev, ESC-n = span, add ESC-N.
225 * v125: Fix tab bug (thanks to Alex Liu). 9/18/89 mark
226 * Fix EOF bug when both -w and -c.
227 * v126: Add -j option. 10/25/89 mark
228 * v127: Fix problems with blank lines before BOF. 10/27/89 mark
229 * v128: Add %bj, etc. to prompt strings. 10/27/89 mark
230 * v129: Add -+,-- commands; add set-option and 11/3/89 mark
231 * unset-option to lesskey.
232 * v130: Generalize A_EXTRA to string, remove 11/6/89 mark
233 * set-option, unset-option from lesskey.
234 * v131: Changed name of EDITPROTO to LESSEDIT. 11/7/89 mark
235 * v132: Allow editing of command prefix. 11/8/89 mark
236 * v133: Add -y option (thanks to Jeff Sullivan). 11/16/89 mark
237 * v134: Glob filenames in the -l command. 12/1/89 mark
238 * v135: Combined {}()[] commands into one, and 12/5/89 mark
239 * added ESC-^F and ESC-^B commands.
240 * v136: Added -S, -R flags. Added | command. 1/20/90 mark
241 * Added warning for binary files. (thanks
242 * to Richard Brittain and J. Sullivan).
243 * v137: Rewrote horrible pappend code. 1/21/90 mark
244 * Added * notation for hi-bit chars.
245 * v138: Fix magic cookie terminal handling. 1/24/90 mark
246 * Get rid of "cleanup" loop in ch_get.
247 * v139: Added MSDOS support. (many thanks 1/27/90 mark
248 * to Richard Brittain).
249 * v140: Editing a new file adds it to the 2/7/90 mark
251 * v141: Add edit_list for editing >1 file. 2/8/90 mark
252 * v142: Add :x command. 2/10/90 mark
253 * v143: Add * and @ modifies to search cmds. 2/11/90 mark
254 * Change ESC-/ cmd from /@* to / *.
255 * v144: Messed around with ch_zero; 3/1/90 mark
257 * v145: Added -R and -v/-V for MSDOS; 3/2/90 mark
258 * renamed FILENAME to avoid conflict.
259 * v146: Pull cmdbuf functions out of command.c 3/5/90 mark
260 * v147: Implement ?@; fix multi-file edit bugs. 3/7/90 mark
261 * v148: Fixed bug in :e<file> then :e#. 3/29/90 mark
262 * v149: Change error,ierror,query to use PARG. 4/3/90 mark
263 * v150: Add LESS_CHARSET, LESS_CHARDEF. 4/6/90 mark
264 * v151: Remove -g option; clean up ispipe. 4/13/90 mark
265 * v152: lsystem() closes input file, for 4/14/90 mark
266 * editors which require exclusive open.
267 * v153: Fix bug if SHELL unset; 4/18/90 mark
268 * fix bug in overstrike control char.
269 * v154: Output to fd 2 via buffer. 4/25/90 mark
270 * v155: Ignore -i if uppercase in pattern 4/30/90 mark
271 * (thanks to Michael Rendell.)
272 * v156: Remove scroll limits in forw() & back(); 5/3/90 mark
273 * causes problems with -c.
274 * v157: Forward search starts at next real line 5/4/90 mark
275 * (not screen line) after jump target.
276 * v158: Added F command. 6/14/90 mark
277 * v159: Fix bug in exiting: output not flushed. 7/29/90 mark
278 * v160: Clear screen before initial output w/ -c. 7/29/90 mark
279 * v161: Add -T flag. 7/29/90 mark
280 * v162: Fix bug with +F on command line. 8/14/90 mark
281 * v163: Added LESSBINFMT variable. 8/21/90 mark
282 * v164: Added -p, LINES, COLUMNS and 9/5/90 mark
283 * unset mark ' == BOF, for 1003.2 D5.
284 * v165: At EOF with -c set, don't display empty 9/6/90 mark
285 * screen when try to page forward.
286 * v166: Fix G when final line in file wraps. 9/6/90 mark
287 * v167: Translate CR/LF -> LF for 1003.2. 9/11/90 mark
288 * v168: Return to curr file if "tag not found". 9/13/90 mark
289 * v169: G goes to EOF even if file has grown. 12/12/90 mark
290 * v170: Add optimization for BSD _setjmp; 1/17/91 mark
291 * fix #include ioctl.h TERMIO problem.
292 * (thanks to Paul Eggert)
294 * -----------------------------------------------------------------
295 * v171: Fix -? bug in get_filename. 3/6/91 mark
296 * v172: Fix G bug in empty file. 3/15/91 mark
297 * Fix bug with ?\n and -i and uppercase
299 * (thanks to Paul Eggert)
300 * v173: Change N cmd to not permanently change 3/17/91 mark
301 * direction. (thanks to Brian Matthews)
302 * v174: Fix bug with namelogfile not getting 3/18/91 mark
303 * cleared when change files.
304 * v175: Fix bug with ++cmd on command line. 3/18/91 mark
305 * (thanks to Jim Meyering)
306 * v176: Change | to not force current screen, 4/2/91 mark
307 * include marked line, start/end from
308 * top of screen. Improve search speed.
309 * (thanks to Don Mears)
310 * v177: Add LESSHELP variable. 4/2/91 mark
311 * Fix bug with F command with -e.
312 * Try /dev/tty for input before using fd 2.
315 char version[] = "@(#) less version 177";
projects / mmh / blob