1 /* $NetBSD: opttbl.c,v 1.6 2023/10/06 07:29:42 simonb Exp $ */
2
3 /*
4 * Copyright (C) 1984-2023 Mark Nudelman
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Less License, as specified in the README file.
8 *
9 * For more information, see the README file.
10 */
11
12
13 /*
14 * The option table.
15 */
16
17 #include "less.h"
18 #include "option.h"
19
20 /*
21 * Variables controlled by command line options.
22 */
23 public int quiet; /* Should we suppress the audible bell? */
24 public int no_vbell; /* Should we suppress the visual bell? */
25 public int how_search; /* Where should forward searches start? */
26 public int top_scroll; /* Repaint screen from top?
27 (alternative is scroll from bottom) */
28 public int pr_type; /* Type of prompt (short, medium, long) */
29 public int bs_mode; /* How to process backspaces */
30 public int know_dumb; /* Don't complain about dumb terminals */
31 public int quit_at_eof; /* Quit after hitting end of file twice */
32 public int quit_if_one_screen; /* Quit if EOF on first screen */
33 public int be_helpful; /* more(1) style -d */
34 public int squeeze; /* Squeeze multiple blank lines into one */
35 public int tabstop; /* Tab settings */
36 public int back_scroll; /* Repaint screen on backwards movement */
37 public int forw_scroll; /* Repaint screen on forward movement */
38 public int caseless; /* Do "caseless" searches */
39 public int linenums; /* Use line numbers */
40 public int autobuf; /* Automatically allocate buffers as needed */
41 public int bufspace; /* Max buffer space per file (K) */
42 public int ctldisp; /* Send control chars to screen untranslated */
43 public int force_open; /* Open the file even if not regular file */
44 public int swindow; /* Size of scrolling window */
45 public int jump_sline; /* Screen line of "jump target" */
46 public long jump_sline_fraction = -1;
47 public long shift_count_fraction = -1;
48 public int chopline; /* Truncate displayed lines at screen width */
49 public int wordwrap; /* Wrap lines at space */
50 public int no_init; /* Disable sending ti/te termcap strings */
51 public int no_keypad; /* Disable sending ks/ke termcap strings */
52 public int twiddle; /* Show tildes after EOF */
53 public int show_attn; /* Hilite first unread line */
54 public int shift_count; /* Number of positions to shift horizontally */
55 public int status_col; /* Display a status column */
56 public int use_lessopen; /* Use the LESSOPEN filter */
57 public int quit_on_intr; /* Quit on interrupt */
58 public int follow_mode; /* F cmd Follows file desc or file name? */
59 public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */
60 public int opt_use_backslash; /* Use backslash escaping in option parsing */
61 public char rscroll_char; /* Char which marks chopped lines with -S */
62 public int rscroll_attr; /* Attribute of rscroll_char */
63 public int no_hist_dups; /* Remove dups from history list */
64 public int mousecap; /* Allow mouse for scrolling */
65 public int wheel_lines; /* Number of lines to scroll on mouse wheel scroll */
66 public int perma_marks; /* Save marks in history file */
67 public int linenum_width; /* Width of line numbers */
68 public int status_col_width; /* Width of status column */
69 public int incr_search; /* Incremental search */
70 public int use_color; /* Use UI color */
71 public int want_filesize; /* Scan to EOF if necessary to get file size */
72 public int status_line; /* Highlight entire marked lines */
73 public int header_lines; /* Freeze header lines at top of screen */
74 public int header_cols; /* Freeze header columns at left of screen */
75 public int nonum_headers; /* Don't give headers line numbers */
76 public int nosearch_headers; /* Don't search in header lines or columns */
77 public int redraw_on_quit; /* Redraw last screen after term deinit */
78 public int def_search_type; /* */
79 public int exit_F_on_close; /* Exit F command when input closes */
80 public int modelines; /* Lines to read looking for modelines */
81 public int show_preproc_error; /* Display msg when preproc exits with error */
82 public int proc_backspace; /* Special handling of backspace */
83 public int proc_tab; /* Special handling of tab */
84 public int proc_return; /* Special handling of carriage return */
85 public char intr_char = CONTROL('X'); /* Char to interrupt reads */
86 #if HILITE_SEARCH
87 public int hilite_search; /* Highlight matched search patterns? */
88 #endif
89
90 public int less_is_more = 0; /* Make compatible with POSIX more */
91
92 /*
93 * Long option names.
94 */
95 static struct optname a_optname = { "search-skip-screen", NULL };
96 static struct optname b_optname = { "buffers", NULL };
97 static struct optname B__optname = { "auto-buffers", NULL };
98 static struct optname c_optname = { "clear-screen", NULL };
99 static struct optname d_optname = { "dumb", NULL };
100 static struct optname D__optname = { "color", NULL };
101 static struct optname e_optname = { "quit-at-eof", NULL };
102 static struct optname f_optname = { "force", NULL };
103 static struct optname F__optname = { "quit-if-one-screen", NULL };
104 #if HILITE_SEARCH
105 static struct optname g_optname = { "hilite-search", NULL };
106 #endif
107 static struct optname h_optname = { "max-back-scroll", NULL };
108 static struct optname i_optname = { "ignore-case", NULL };
109 static struct optname j_optname = { "jump-target", NULL };
110 static struct optname J__optname = { "status-column", NULL };
111 #if USERFILE
112 static struct optname k_optname = { "lesskey-file", NULL };
113 #if HAVE_LESSKEYSRC
114 static struct optname ks_optname = { "lesskey-src", NULL };
115 #endif /* HAVE_LESSKEYSRC */
116 #endif
117 static struct optname K__optname = { "quit-on-intr", NULL };
118 static struct optname L__optname = { "no-lessopen", NULL };
119 static struct optname m_optname = { "long-prompt", NULL };
120 static struct optname n_optname = { "line-numbers", NULL };
121 #if LOGFILE
122 static struct optname o_optname = { "log-file", NULL };
123 static struct optname O__optname = { "LOG-FILE", NULL };
124 #endif
125 static struct optname p_optname = { "pattern", NULL };
126 static struct optname P__optname = { "prompt", NULL };
127 static struct optname q2_optname = { "silent", NULL };
128 static struct optname q_optname = { "quiet", &q2_optname };
129 static struct optname r_optname = { "raw-control-chars", NULL };
130 static struct optname s_optname = { "squeeze-blank-lines", NULL };
131 static struct optname S__optname = { "chop-long-lines", NULL };
132 #if TAGS
133 static struct optname t_optname = { "tag", NULL };
134 static struct optname T__optname = { "tag-file", NULL };
135 #endif
136 static struct optname u_optname = { "underline-special", NULL };
137 static struct optname V__optname = { "version", NULL };
138 static struct optname w_optname = { "hilite-unread", NULL };
139 static struct optname x_optname = { "tabs", NULL };
140 static struct optname X__optname = { "no-init", NULL };
141 static struct optname y_optname = { "max-forw-scroll", NULL };
142 static struct optname z_optname = { "window", NULL };
143 static struct optname quote_optname = { "quotes", NULL };
144 static struct optname tilde_optname = { "tilde", NULL };
145 static struct optname query_optname = { "help", NULL };
146 static struct optname pound_optname = { "shift", NULL };
147 static struct optname keypad_optname = { "no-keypad", NULL };
148 static struct optname oldbot_optname = { "old-bot", NULL };
149 static struct optname follow_optname = { "follow-name", NULL };
150 static struct optname use_backslash_optname = { "use-backslash", NULL };
151 static struct optname rscroll_optname = { "rscroll", NULL };
152 static struct optname nohistdups_optname = { "no-histdups", NULL };
153 static struct optname mousecap_optname = { "mouse", NULL };
154 static struct optname wheel_lines_optname = { "wheel-lines", NULL };
155 static struct optname perma_marks_optname = { "save-marks", NULL };
156 static struct optname linenum_width_optname = { "line-num-width", NULL };
157 static struct optname status_col_width_optname = { "status-col-width", NULL };
158 static struct optname incr_search_optname = { "incsearch", NULL };
159 static struct optname use_color_optname = { "use-color", NULL };
160 static struct optname want_filesize_optname = { "file-size", NULL };
161 static struct optname status_line_optname = { "status-line", NULL };
162 static struct optname header_optname = { "header", NULL };
163 static struct optname nonum_headers_optname = { "no-number-headers", NULL };
164 static struct optname nosearch_headers_optname = { "no-search-headers", NULL };
165 static struct optname redraw_on_quit_optname = { "redraw-on-quit", NULL };
166 static struct optname search_type_optname = { "search-options", NULL };
167 static struct optname exit_F_on_close_optname = { "exit-follow-on-close", NULL };
168 static struct optname modelines_optname = { "modelines", NULL };
169 static struct optname no_vbell_optname = { "no-vbell", NULL };
170 static struct optname intr_optname = { "intr", NULL };
171 static struct optname wordwrap_optname = { "wordwrap", NULL };
172 static struct optname show_preproc_error_optname = { "show-preproc-errors", NULL };
173 static struct optname proc_backspace_optname = { "proc-backspace", NULL };
174 static struct optname proc_tab_optname = { "proc-tab", NULL };
175 static struct optname proc_return_optname = { "proc-return", NULL };
176 #if LESSTEST
177 static struct optname ttyin_name_optname = { "tty", NULL };
178 #endif /*LESSTEST*/
179
180
181 /*
182 * Table of all options and their semantics.
183 *
184 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
185 * the description of the option when set to 0, 1 or 2, respectively.
186 * For NUMBER options, odesc[0] is the prompt to use when entering
187 * a new value, and odesc[1] is the description, which should contain
188 * one %d which is replaced by the value of the number.
189 * For STRING options, odesc[0] is the prompt to use when entering
190 * a new value, and odesc[1], if not NULL, is the set of characters
191 * that are valid in the string.
192 */
193 static struct loption option[] =
194 {
195 { 'a', &a_optname,
196 TRIPLE, OPT_ONPLUS, &how_search, NULL,
197 {
198 "Search includes displayed screen",
199 "Search skips displayed screen",
200 "Search includes all of displayed screen"
201 }
202 },
203
204 { 'b', &b_optname,
205 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b,
206 {
207 "Max buffer space per file (K): ",
208 "Max buffer space per file: %dK",
209 NULL
210 }
211 },
212 { 'B', &B__optname,
213 BOOL, OPT_ON, &autobuf, NULL,
214 {
215 "Don't automatically allocate buffers",
216 "Automatically allocate buffers when needed",
217 NULL
218 }
219 },
220 { 'c', &c_optname,
221 TRIPLE, OPT_OFF, &top_scroll, NULL,
222 {
223 "Repaint by scrolling from bottom of screen",
224 "Repaint by painting from top of screen",
225 "Repaint by painting from top of screen"
226 }
227 },
228 #if 1
229 { 'd', &d_optname,
230 BOOL, OPT_OFF, &be_helpful, NULL,
231 { "Be less helpful in prompts",
232 "Be helpful in prompts",
233 NULL }
234 },
235 #endif
236 { -1, &d_optname,
237 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
238 {
239 "Assume intelligent terminal",
240 "Assume dumb terminal",
241 NULL
242 }
243 },
244 { 'D', &D__optname,
245 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D,
246 {
247 "color desc: ",
248 NULL,
249 NULL
250 }
251 },
252 { 'e', &e_optname,
253 TRIPLE, OPT_OFF, &quit_at_eof, NULL,
254 {
255 "Don't quit at end-of-file",
256 "Quit at end-of-file",
257 "Quit immediately at end-of-file"
258 }
259 },
260 { 'f', &f_optname,
261 BOOL, OPT_OFF, &force_open, NULL,
262 {
263 "Open only regular files",
264 "Open even non-regular files",
265 NULL
266 }
267 },
268 { 'F', &F__optname,
269 BOOL, OPT_OFF, &quit_if_one_screen, NULL,
270 {
271 "Don't quit if end-of-file on first screen",
272 "Quit if end-of-file on first screen",
273 NULL
274 }
275 },
276 #if HILITE_SEARCH
277 { 'g', &g_optname,
278 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
279 {
280 "Don't highlight search matches",
281 "Highlight matches for previous search only",
282 "Highlight all matches for previous search pattern",
283 }
284 },
285 #endif
286 { 'h', &h_optname,
287 NUMBER, -1, &back_scroll, NULL,
288 {
289 "Backwards scroll limit: ",
290 "Backwards scroll limit is %d lines",
291 NULL
292 }
293 },
294 { 'i', &i_optname,
295 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i,
296 {
297 "Case is significant in searches",
298 "Ignore case in searches",
299 "Ignore case in searches and in patterns"
300 }
301 },
302 { 'j', &j_optname,
303 STRING, 0, NULL, opt_j,
304 {
305 "Target line: ",
306 "0123456789.-",
307 NULL
308 }
309 },
310 { 'J', &J__optname,
311 BOOL|REPAINT, OPT_OFF, &status_col, NULL,
312 {
313 "Don't display a status column",
314 "Display a status column",
315 NULL
316 }
317 },
318 #if USERFILE
319 { 'k', &k_optname,
320 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k,
321 { NULL, NULL, NULL }
322 },
323 #if HAVE_LESSKEYSRC
324 { OLETTER_NONE, &ks_optname,
325 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_ks,
326 { NULL, NULL, NULL }
327 },
328 #endif /* HAVE_LESSKEYSRC */
329 #endif
330 { 'K', &K__optname,
331 BOOL, OPT_OFF, &quit_on_intr, NULL,
332 {
333 "Interrupt (ctrl-C) returns to prompt",
334 "Interrupt (ctrl-C) exits less",
335 NULL
336 }
337 },
338 { 'L', &L__optname,
339 BOOL, OPT_ON, &use_lessopen, NULL,
340 {
341 "Don't use the LESSOPEN filter",
342 "Use the LESSOPEN filter",
343 NULL
344 }
345 },
346 { 'm', &m_optname,
347 TRIPLE, OPT_OFF, &pr_type, NULL,
348 {
349 "Short prompt",
350 "Medium prompt",
351 "Long prompt"
352 }
353 },
354 { 'n', &n_optname,
355 TRIPLE|REPAINT, OPT_ON, &linenums, NULL,
356 {
357 "Don't use line numbers",
358 "Use line numbers",
359 "Constantly display line numbers"
360 }
361 },
362 #if LOGFILE
363 { 'o', &o_optname,
364 STRING, 0, NULL, opt_o,
365 { "log file: ", NULL, NULL }
366 },
367 { 'O', &O__optname,
368 STRING, 0, NULL, opt__O,
369 { "Log file: ", NULL, NULL }
370 },
371 #endif
372 { 'p', &p_optname,
373 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p,
374 { NULL, NULL, NULL }
375 },
376 { 'P', &P__optname,
377 STRING, 0, NULL, opt__P,
378 { "prompt: ", NULL, NULL }
379 },
380 { 'q', &q_optname,
381 TRIPLE, OPT_OFF, &quiet, NULL,
382 {
383 "Ring the bell for errors AND at eof/bof",
384 "Ring the bell for errors but not at eof/bof",
385 "Never ring the bell"
386 }
387 },
388 { 'r', &r_optname,
389 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL,
390 {
391 "Display control characters as ^X",
392 "Display control characters directly (not recommended)",
393 "Display ANSI sequences directly, other control characters as ^X"
394 }
395 },
396 { 's', &s_optname,
397 BOOL|REPAINT, OPT_OFF, &squeeze, NULL,
398 {
399 "Display all blank lines",
400 "Squeeze multiple blank lines",
401 NULL
402 }
403 },
404 { 'S', &S__optname,
405 BOOL|REPAINT, OPT_OFF, &chopline, NULL,
406 {
407 "Fold long lines",
408 "Chop long lines",
409 NULL
410 }
411 },
412 #if TAGS
413 { 't', &t_optname,
414 STRING|NO_QUERY, 0, NULL, opt_t,
415 { "tag: ", NULL, NULL }
416 },
417 { 'T', &T__optname,
418 STRING, 0, NULL, opt__T,
419 { "tags file: ", NULL, NULL }
420 },
421 #endif
422 { 'u', &u_optname,
423 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &bs_mode, NULL,
424 {
425 "Display underlined text in underline mode",
426 "Backspaces cause overstrike",
427 "Print backspace as ^H"
428 }
429 },
430 { 'V', &V__optname,
431 NOVAR, 0, NULL, opt__V,
432 { NULL, NULL, NULL }
433 },
434 { 'w', &w_optname,
435 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL,
436 {
437 "Don't highlight first unread line",
438 "Highlight first unread line after forward-screen",
439 "Highlight first unread line after any forward movement",
440 }
441 },
442 { 'x', &x_optname,
443 STRING|REPAINT, 0, NULL, opt_x,
444 {
445 "Tab stops: ",
446 "0123456789,",
447 NULL
448 }
449 },
450 { 'X', &X__optname,
451 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL,
452 {
453 "Send init/deinit strings to terminal",
454 "Don't use init/deinit strings",
455 NULL
456 }
457 },
458 { 'y', &y_optname,
459 NUMBER, -1, &forw_scroll, NULL,
460 {
461 "Forward scroll limit: ",
462 "Forward scroll limit is %d lines",
463 NULL
464 }
465 },
466 { 'z', &z_optname,
467 NUMBER, -1, &swindow, NULL,
468 {
469 "Scroll window size: ",
470 "Scroll window size is %d lines",
471 NULL
472 }
473 },
474 { '"', "e_optname,
475 STRING, 0, NULL, opt_quote,
476 { "quotes: ", NULL, NULL }
477 },
478 { '~', &tilde_optname,
479 BOOL|REPAINT, OPT_ON, &twiddle, NULL,
480 {
481 "Don't show tildes after end of file",
482 "Show tildes after end of file",
483 NULL
484 }
485 },
486 { '?', &query_optname,
487 NOVAR, 0, NULL, opt_query,
488 { NULL, NULL, NULL }
489 },
490 { '#', £_optname,
491 STRING, 0, NULL, opt_shift,
492 {
493 "Horizontal shift: ",
494 "0123456789.",
495 NULL
496 }
497 },
498 { OLETTER_NONE, &keypad_optname,
499 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
500 {
501 "Use keypad mode",
502 "Don't use keypad mode",
503 NULL
504 }
505 },
506 { OLETTER_NONE, &oldbot_optname,
507 BOOL, OPT_OFF, &oldbot, NULL,
508 {
509 "Use new bottom of screen behavior",
510 "Use old bottom of screen behavior",
511 NULL
512 }
513 },
514 { OLETTER_NONE, &follow_optname,
515 BOOL, FOLLOW_DESC, &follow_mode, NULL,
516 {
517 "F command follows file descriptor",
518 "F command follows file name",
519 NULL
520 }
521 },
522 { OLETTER_NONE, &use_backslash_optname,
523 BOOL, OPT_OFF, &opt_use_backslash, NULL,
524 {
525 "Use backslash escaping in command line parameters",
526 "Don't use backslash escaping in command line parameters",
527 NULL
528 }
529 },
530 { OLETTER_NONE, &rscroll_optname,
531 STRING|REPAINT|INIT_HANDLER, 0, NULL, opt_rscroll,
532 { "rscroll character: ", NULL, NULL }
533 },
534 { OLETTER_NONE, &nohistdups_optname,
535 BOOL, OPT_OFF, &no_hist_dups, NULL,
536 {
537 "Allow duplicates in history list",
538 "Remove duplicates from history list",
539 NULL
540 }
541 },
542 { OLETTER_NONE, &mousecap_optname,
543 TRIPLE, OPT_OFF, &mousecap, opt_mousecap,
544 {
545 "Ignore mouse input",
546 "Use the mouse for scrolling",
547 "Use the mouse for scrolling (reverse)"
548 }
549 },
550 { OLETTER_NONE, &wheel_lines_optname,
551 NUMBER|INIT_HANDLER, 0, &wheel_lines, opt_wheel_lines,
552 {
553 "Lines to scroll on mouse wheel: ",
554 "Scroll %d line(s) on mouse wheel",
555 NULL
556 }
557 },
558 { OLETTER_NONE, &perma_marks_optname,
559 BOOL, OPT_OFF, &perma_marks, NULL,
560 {
561 "Don't save marks in history file",
562 "Save marks in history file",
563 NULL
564 }
565 },
566 { OLETTER_NONE, &linenum_width_optname,
567 NUMBER|REPAINT, MIN_LINENUM_WIDTH, &linenum_width, opt_linenum_width,
568 {
569 "Line number width: ",
570 "Line number width is %d chars",
571 NULL
572 }
573 },
574 { OLETTER_NONE, &status_col_width_optname,
575 NUMBER|REPAINT, 2, &status_col_width, opt_status_col_width,
576 {
577 "Status column width: ",
578 "Status column width is %d chars",
579 NULL
580 }
581 },
582 { OLETTER_NONE, &incr_search_optname,
583 BOOL, OPT_OFF, &incr_search, NULL,
584 {
585 "Incremental search is off",
586 "Incremental search is on",
587 NULL
588 }
589 },
590 { OLETTER_NONE, &use_color_optname,
591 BOOL|REPAINT, OPT_OFF, &use_color, NULL,
592 {
593 "Don't use color",
594 "Use color",
595 NULL
596 }
597 },
598 { OLETTER_NONE, &want_filesize_optname,
599 BOOL|REPAINT, OPT_OFF, &want_filesize, opt_filesize,
600 {
601 "Don't get size of each file",
602 "Get size of each file",
603 NULL
604 }
605 },
606 { OLETTER_NONE, &status_line_optname,
607 BOOL|REPAINT, OPT_OFF, &status_line, NULL,
608 {
609 "Don't color each line with its status column color",
610 "Color each line with its status column color",
611 NULL
612 }
613 },
614 { OLETTER_NONE, &header_optname,
615 STRING|REPAINT, 0, NULL, opt_header,
616 {
617 "Header lines: ",
618 NULL,
619 NULL
620 }
621 },
622 { OLETTER_NONE, &nonum_headers_optname,
623 BOOL|REPAINT, 0, &nonum_headers, NULL,
624 {
625 "Number header lines",
626 "Don't number header lines",
627 NULL
628 }
629 },
630 { OLETTER_NONE, &nosearch_headers_optname,
631 BOOL|HL_REPAINT, 0, &nosearch_headers, NULL,
632 {
633 "Search includes header lines",
634 "Search does not include header lines",
635 NULL
636 }
637 },
638 { OLETTER_NONE, &redraw_on_quit_optname,
639 BOOL, OPT_OFF, &redraw_on_quit, NULL,
640 {
641 "Don't redraw screen when quitting",
642 "Redraw last screen when quitting",
643 NULL
644 }
645 },
646 { OLETTER_NONE, &search_type_optname,
647 STRING, 0, NULL, opt_search_type,
648 {
649 "Search options: ",
650 NULL,
651 NULL
652 }
653 },
654 { OLETTER_NONE, &exit_F_on_close_optname,
655 BOOL, OPT_OFF, &exit_F_on_close, NULL,
656 {
657 "Don't exit F command when input closes",
658 "Exit F command when input closes",
659 NULL
660 }
661 },
662 { OLETTER_NONE, &no_vbell_optname,
663 BOOL, OPT_OFF, &no_vbell, NULL,
664 {
665 "Display visual bell",
666 "Don't display visual bell",
667 NULL
668 }
669 },
670 { OLETTER_NONE, &modelines_optname,
671 NUMBER, 0, &modelines, NULL,
672 {
673 "Lines to read looking for modelines: ",
674 "Read %d lines looking for modelines",
675 NULL
676 }
677 },
678 { OLETTER_NONE, &intr_optname,
679 STRING, 0, NULL, opt_intr,
680 { "interrupt character: ", NULL, NULL }
681 },
682 { OLETTER_NONE, &wordwrap_optname,
683 BOOL|REPAINT, OPT_OFF, &wordwrap, NULL,
684 {
685 "Wrap lines at any character",
686 "Wrap lines at spaces",
687 NULL
688 }
689 },
690 { OLETTER_NONE, &show_preproc_error_optname,
691 BOOL, OPT_OFF, &show_preproc_error, NULL,
692 {
693 "Don't show error message if preprocessor fails",
694 "Show error message if preprocessor fails",
695 NULL
696 }
697 },
698 { OLETTER_NONE, &proc_backspace_optname,
699 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &proc_backspace, NULL,
700 {
701 "Backspace handling is specified by the -U option",
702 "Display underline text in underline mode",
703 "Print backspaces as ^H"
704 }
705 },
706 { OLETTER_NONE, &proc_tab_optname,
707 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &proc_tab, NULL,
708 {
709 "Tab handling is specified by the -U option",
710 "Expand tabs to spaces",
711 "Print tabs as ^I"
712 }
713 },
714 { OLETTER_NONE, &proc_return_optname,
715 TRIPLE|REPAINT|HL_REPAINT, OPT_OFF, &proc_return, NULL,
716 {
717 "Carriage return handling is specified by the -U option",
718 "Delete carriage return before newline",
719 "Print carriage return as ^M"
720 }
721 },
722 #if LESSTEST
723 { OLETTER_NONE, &ttyin_name_optname,
724 STRING|NO_TOGGLE, 0, NULL, opt_ttyin_name,
725 {
726 NULL,
727 NULL,
728 NULL
729 }
730 },
731 #endif /*LESSTEST*/
732 { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
733 };
734
735
736 /*
737 * Initialize each option to its default value.
738 */
init_option(void)739 public void init_option(void)
740 {
741 struct loption *o;
742 char *p;
743
744 p = lgetenv("LESS_IS_MORE");
745 if (!isnullenv(p))
746 less_is_more = 1;
747
748 for (o = option; o->oletter != '\0'; o++)
749 {
750 /*
751 * Set each variable to its default.
752 */
753 if (o->ovar != NULL)
754 *(o->ovar) = o->odefault;
755 if (o->otype & INIT_HANDLER)
756 (*(o->ofunc))(INIT, (char *) NULL);
757 }
758 }
759
760 /*
761 * Find an option in the option table, given its option letter.
762 */
findopt(int c)763 public struct loption * findopt(int c)
764 {
765 struct loption *o;
766
767 for (o = option; o->oletter != '\0'; o++)
768 {
769 if (o->oletter == c)
770 return (o);
771 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c)
772 return (o);
773 }
774 return (NULL);
775 }
776
777 /*
778 *
779 */
is_optchar(char c)780 static int is_optchar(char c)
781 {
782 if (ASCII_IS_UPPER(c))
783 return 1;
784 if (ASCII_IS_LOWER(c))
785 return 1;
786 if (c == '-')
787 return 1;
788 return 0;
789 }
790
791 /*
792 * Find an option in the option table, given its option name.
793 * p_optname is the (possibly partial) name to look for, and
794 * is updated to point after the matched name.
795 * p_oname if non-NULL is set to point to the full option name.
796 */
findopt_name(char ** p_optname,char ** p_oname,int * p_err)797 public struct loption * findopt_name(char **p_optname, char **p_oname, int *p_err)
798 {
799 char *optname = *p_optname;
800 struct loption *o;
801 struct optname *oname;
802 int len;
803 int uppercase;
804 struct loption *maxo = NULL;
805 struct optname *maxoname = NULL;
806 int maxlen = 0;
807 int ambig = 0;
808 int exact = 0;
809
810 /*
811 * Check all options.
812 */
813 for (o = option; o->oletter != '\0'; o++)
814 {
815 /*
816 * Check all names for this option.
817 */
818 for (oname = o->onames; oname != NULL; oname = oname->onext)
819 {
820 /*
821 * Try normal match first (uppercase == 0),
822 * then, then if it's a TRIPLE option,
823 * try uppercase match (uppercase == 1).
824 */
825 for (uppercase = 0; uppercase <= 1; uppercase++)
826 {
827 len = sprefix(optname, oname->oname, uppercase);
828 if (len <= 0 || is_optchar(optname[len]))
829 {
830 /*
831 * We didn't use all of the option name.
832 */
833 continue;
834 }
835 if (!exact && len == maxlen)
836 /*
837 * Already had a partial match,
838 * and now there's another one that
839 * matches the same length.
840 */
841 ambig = 1;
842 else if (len > maxlen)
843 {
844 /*
845 * Found a better match than
846 * the one we had.
847 */
848 maxo = o;
849 maxoname = oname;
850 maxlen = len;
851 ambig = 0;
852 exact = (len == (int)strlen(oname->oname));
853 }
854 if (!(o->otype & TRIPLE))
855 break;
856 }
857 }
858 }
859 if (ambig)
860 {
861 /*
862 * Name matched more than one option.
863 */
864 if (p_err != NULL)
865 *p_err = OPT_AMBIG;
866 return (NULL);
867 }
868 *p_optname = optname + maxlen;
869 if (p_oname != NULL)
870 *p_oname = maxoname == NULL ? NULL : maxoname->oname;
871 return (maxo);
872 }
873