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