1 /* $NetBSD: opttbl.c,v 1.4 2013/09/04 19:44:21 tron Exp $ */
2
3 /*
4 * Copyright (C) 1984-2012 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 how_search; /* Where should forward searches start? */
25 public int top_scroll; /* Repaint screen from top?
26 (alternative is scroll from bottom) */
27 public int pr_type; /* Type of prompt (short, medium, long) */
28 public int bs_mode; /* How to process backspaces */
29 public int know_dumb; /* Don't complain about dumb terminals */
30 public int quit_at_eof; /* Quit after hitting end of file twice */
31 public int quit_if_one_screen; /* Quit if EOF on first screen */
32 public int be_helpful; /* more(1) style -d */
33 public int squeeze; /* Squeeze multiple blank lines into one */
34 public int tabstop; /* Tab settings */
35 public int back_scroll; /* Repaint screen on backwards movement */
36 public int forw_scroll; /* Repaint screen on forward movement */
37 public int caseless; /* Do "caseless" searches */
38 public int linenums; /* Use line numbers */
39 public int autobuf; /* Automatically allocate buffers as needed */
40 public int bufspace; /* Max buffer space per file (K) */
41 public int ctldisp; /* Send control chars to screen untranslated */
42 public int force_open; /* Open the file even if not regular file */
43 public int swindow; /* Size of scrolling window */
44 public int jump_sline; /* Screen line of "jump target" */
45 public long jump_sline_fraction = -1;
46 public long shift_count_fraction = -1;
47 public int chopline; /* Truncate displayed lines at screen width */
48 public int no_init; /* Disable sending ti/te termcap strings */
49 public int no_keypad; /* Disable sending ks/ke termcap strings */
50 public int twiddle; /* Show tildes after EOF */
51 public int show_attn; /* Hilite first unread line */
52 public int shift_count; /* Number of positions to shift horizontally */
53 public int status_col; /* Display a status column */
54 public int use_lessopen; /* Use the LESSOPEN filter */
55 public int quit_on_intr; /* Quit on interrupt */
56 public int follow_mode; /* F cmd Follows file desc or file name? */
57 public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */
58 public int opt_use_backslash; /* Use backslash escaping in option parsing */
59 #if HILITE_SEARCH
60 public int hilite_search; /* Highlight matched search patterns? */
61 #endif
62
63 public int less_is_more = 0; /* Make compatible with POSIX more */
64
65 /*
66 * Long option names.
67 */
68 static struct optname a_optname = { "search-skip-screen", NULL };
69 static struct optname b_optname = { "buffers", NULL };
70 static struct optname B__optname = { "auto-buffers", NULL };
71 static struct optname c_optname = { "clear-screen", NULL };
72 static struct optname d_optname = { "dumb", NULL };
73 #if MSDOS_COMPILER
74 static struct optname D__optname = { "color", NULL };
75 #endif
76 static struct optname e_optname = { "quit-at-eof", NULL };
77 static struct optname f_optname = { "force", NULL };
78 static struct optname F__optname = { "quit-if-one-screen", NULL };
79 #if HILITE_SEARCH
80 static struct optname g_optname = { "hilite-search", NULL };
81 #endif
82 static struct optname h_optname = { "max-back-scroll", NULL };
83 static struct optname i_optname = { "ignore-case", NULL };
84 static struct optname j_optname = { "jump-target", NULL };
85 static struct optname J__optname = { "status-column", NULL };
86 #if USERFILE
87 static struct optname k_optname = { "lesskey-file", NULL };
88 #endif
89 static struct optname K__optname = { "quit-on-intr", NULL };
90 static struct optname L__optname = { "no-lessopen", NULL };
91 static struct optname m_optname = { "long-prompt", NULL };
92 static struct optname n_optname = { "line-numbers", NULL };
93 #if LOGFILE
94 static struct optname o_optname = { "log-file", NULL };
95 static struct optname O__optname = { "LOG-FILE", NULL };
96 #endif
97 static struct optname p_optname = { "pattern", NULL };
98 static struct optname P__optname = { "prompt", NULL };
99 static struct optname q2_optname = { "silent", NULL };
100 static struct optname q_optname = { "quiet", &q2_optname };
101 static struct optname r_optname = { "raw-control-chars", NULL };
102 static struct optname s_optname = { "squeeze-blank-lines", NULL };
103 static struct optname S__optname = { "chop-long-lines", NULL };
104 #if TAGS
105 static struct optname t_optname = { "tag", NULL };
106 static struct optname T__optname = { "tag-file", NULL };
107 #endif
108 static struct optname u_optname = { "underline-special", NULL };
109 static struct optname V__optname = { "version", NULL };
110 static struct optname w_optname = { "hilite-unread", NULL };
111 static struct optname x_optname = { "tabs", NULL };
112 static struct optname X__optname = { "no-init", NULL };
113 static struct optname y_optname = { "max-forw-scroll", NULL };
114 static struct optname z_optname = { "window", NULL };
115 static struct optname quote_optname = { "quotes", NULL };
116 static struct optname tilde_optname = { "tilde", NULL };
117 static struct optname query_optname = { "help", NULL };
118 static struct optname pound_optname = { "shift", NULL };
119 static struct optname keypad_optname = { "no-keypad", NULL };
120 static struct optname oldbot_optname = { "old-bot", NULL };
121 static struct optname follow_optname = { "follow-name", NULL };
122 static struct optname use_backslash_optname = { "use-backslash", NULL };
123
124
125 /*
126 * Table of all options and their semantics.
127 *
128 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
129 * the description of the option when set to 0, 1 or 2, respectively.
130 * For NUMBER options, odesc[0] is the prompt to use when entering
131 * a new value, and odesc[1] is the description, which should contain
132 * one %d which is replaced by the value of the number.
133 * For STRING options, odesc[0] is the prompt to use when entering
134 * a new value, and odesc[1], if not NULL, is the set of characters
135 * that are valid in the string.
136 */
137 static struct loption option[] =
138 {
139 { 'a', &a_optname,
140 TRIPLE, OPT_ONPLUS, &how_search, NULL,
141 {
142 "Search includes displayed screen",
143 "Search skips displayed screen",
144 "Search includes all of displayed screen"
145 }
146 },
147
148 { 'b', &b_optname,
149 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b,
150 {
151 "Max buffer space per file (K): ",
152 "Max buffer space per file: %dK",
153 NULL
154 }
155 },
156 { 'B', &B__optname,
157 BOOL, OPT_ON, &autobuf, NULL,
158 {
159 "Don't automatically allocate buffers",
160 "Automatically allocate buffers when needed",
161 NULL
162 }
163 },
164 { 'c', &c_optname,
165 TRIPLE, OPT_OFF, &top_scroll, NULL,
166 {
167 "Repaint by scrolling from bottom of screen",
168 "Repaint by painting from top of screen",
169 "Repaint by painting from top of screen"
170 }
171 },
172 #if 1
173 { 'd', &d_optname,
174 BOOL, OPT_OFF, &be_helpful, NULL,
175 { "Be less helpful in prompts",
176 "Be helpful in prompts",
177 NULL }
178 },
179 #endif
180 { -1, &d_optname,
181 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
182 {
183 "Assume intelligent terminal",
184 "Assume dumb terminal",
185 NULL
186 }
187 },
188 #if MSDOS_COMPILER
189 { 'D', &D__optname,
190 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D,
191 {
192 "color desc: ",
193 "Ddknsu0123456789.",
194 NULL
195 }
196 },
197 #endif
198 { 'e', &e_optname,
199 TRIPLE, OPT_OFF, &quit_at_eof, NULL,
200 {
201 "Don't quit at end-of-file",
202 "Quit at end-of-file",
203 "Quit immediately at end-of-file"
204 }
205 },
206 { 'f', &f_optname,
207 BOOL, OPT_OFF, &force_open, NULL,
208 {
209 "Open only regular files",
210 "Open even non-regular files",
211 NULL
212 }
213 },
214 { 'F', &F__optname,
215 BOOL, OPT_OFF, &quit_if_one_screen, NULL,
216 {
217 "Don't quit if end-of-file on first screen",
218 "Quit if end-of-file on first screen",
219 NULL
220 }
221 },
222 #if HILITE_SEARCH
223 { 'g', &g_optname,
224 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
225 {
226 "Don't highlight search matches",
227 "Highlight matches for previous search only",
228 "Highlight all matches for previous search pattern",
229 }
230 },
231 #endif
232 { 'h', &h_optname,
233 NUMBER, -1, &back_scroll, NULL,
234 {
235 "Backwards scroll limit: ",
236 "Backwards scroll limit is %d lines",
237 NULL
238 }
239 },
240 { 'i', &i_optname,
241 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i,
242 {
243 "Case is significant in searches",
244 "Ignore case in searches",
245 "Ignore case in searches and in patterns"
246 }
247 },
248 { 'j', &j_optname,
249 STRING, 0, NULL, opt_j,
250 {
251 "Target line: ",
252 "0123456789.-",
253 NULL
254 }
255 },
256 { 'J', &J__optname,
257 BOOL|REPAINT, OPT_OFF, &status_col, NULL,
258 {
259 "Don't display a status column",
260 "Display a status column",
261 NULL
262 }
263 },
264 #if USERFILE
265 { 'k', &k_optname,
266 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k,
267 { NULL, NULL, NULL }
268 },
269 #endif
270 { 'K', &K__optname,
271 BOOL, OPT_OFF, &quit_on_intr, NULL,
272 {
273 "Interrupt (ctrl-C) returns to prompt",
274 "Interrupt (ctrl-C) exits less",
275 NULL
276 }
277 },
278 { 'L', &L__optname,
279 BOOL, OPT_ON, &use_lessopen, NULL,
280 {
281 "Don't use the LESSOPEN filter",
282 "Use the LESSOPEN filter",
283 NULL
284 }
285 },
286 { 'm', &m_optname,
287 TRIPLE, OPT_OFF, &pr_type, NULL,
288 {
289 "Short prompt",
290 "Medium prompt",
291 "Long prompt"
292 }
293 },
294 { 'n', &n_optname,
295 TRIPLE|REPAINT, OPT_ON, &linenums, NULL,
296 {
297 "Don't use line numbers",
298 "Use line numbers",
299 "Constantly display line numbers"
300 }
301 },
302 #if LOGFILE
303 { 'o', &o_optname,
304 STRING, 0, NULL, opt_o,
305 { "log file: ", NULL, NULL }
306 },
307 { 'O', &O__optname,
308 STRING, 0, NULL, opt__O,
309 { "Log file: ", NULL, NULL }
310 },
311 #endif
312 { 'p', &p_optname,
313 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p,
314 { NULL, NULL, NULL }
315 },
316 { 'P', &P__optname,
317 STRING, 0, NULL, opt__P,
318 { "prompt: ", NULL, NULL }
319 },
320 { 'q', &q_optname,
321 TRIPLE, OPT_OFF, &quiet, NULL,
322 {
323 "Ring the bell for errors AND at eof/bof",
324 "Ring the bell for errors but not at eof/bof",
325 "Never ring the bell"
326 }
327 },
328 { 'r', &r_optname,
329 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL,
330 {
331 "Display control characters as ^X",
332 "Display control characters directly",
333 "Display control characters directly, processing ANSI sequences"
334 }
335 },
336 { 's', &s_optname,
337 BOOL|REPAINT, OPT_OFF, &squeeze, NULL,
338 {
339 "Display all blank lines",
340 "Squeeze multiple blank lines",
341 NULL
342 }
343 },
344 { 'S', &S__optname,
345 BOOL|REPAINT, OPT_OFF, &chopline, NULL,
346 {
347 "Fold long lines",
348 "Chop long lines",
349 NULL
350 }
351 },
352 #if TAGS
353 { 't', &t_optname,
354 STRING|NO_QUERY, 0, NULL, opt_t,
355 { "tag: ", NULL, NULL }
356 },
357 { 'T', &T__optname,
358 STRING, 0, NULL, opt__T,
359 { "tags file: ", NULL, NULL }
360 },
361 #endif
362 { 'u', &u_optname,
363 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL,
364 {
365 "Display underlined text in underline mode",
366 "Backspaces cause overstrike",
367 "Print backspace as ^H"
368 }
369 },
370 { 'V', &V__optname,
371 NOVAR, 0, NULL, opt__V,
372 { NULL, NULL, NULL }
373 },
374 { 'w', &w_optname,
375 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL,
376 {
377 "Don't highlight first unread line",
378 "Highlight first unread line after forward-screen",
379 "Highlight first unread line after any forward movement",
380 }
381 },
382 { 'x', &x_optname,
383 STRING|REPAINT, 0, NULL, opt_x,
384 {
385 "Tab stops: ",
386 "0123456789,",
387 NULL
388 }
389 },
390 { 'X', &X__optname,
391 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL,
392 {
393 "Send init/deinit strings to terminal",
394 "Don't use init/deinit strings",
395 NULL
396 }
397 },
398 { 'y', &y_optname,
399 NUMBER, -1, &forw_scroll, NULL,
400 {
401 "Forward scroll limit: ",
402 "Forward scroll limit is %d lines",
403 NULL
404 }
405 },
406 { 'z', &z_optname,
407 NUMBER, -1, &swindow, NULL,
408 {
409 "Scroll window size: ",
410 "Scroll window size is %d lines",
411 NULL
412 }
413 },
414 { '"', "e_optname,
415 STRING, 0, NULL, opt_quote,
416 { "quotes: ", NULL, NULL }
417 },
418 { '~', &tilde_optname,
419 BOOL|REPAINT, OPT_ON, &twiddle, NULL,
420 {
421 "Don't show tildes after end of file",
422 "Show tildes after end of file",
423 NULL
424 }
425 },
426 { '?', &query_optname,
427 NOVAR, 0, NULL, opt_query,
428 { NULL, NULL, NULL }
429 },
430 { '#', £_optname,
431 STRING, 0, NULL, opt_shift,
432 {
433 "Horizontal shift: ",
434 "0123456789.",
435 NULL
436 }
437 },
438 { OLETTER_NONE, &keypad_optname,
439 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
440 {
441 "Use keypad mode",
442 "Don't use keypad mode",
443 NULL
444 }
445 },
446 { OLETTER_NONE, &oldbot_optname,
447 BOOL, OPT_OFF, &oldbot, NULL,
448 {
449 "Use new bottom of screen behavior",
450 "Use old bottom of screen behavior",
451 NULL
452 }
453 },
454 { OLETTER_NONE, &follow_optname,
455 BOOL, FOLLOW_DESC, &follow_mode, NULL,
456 {
457 "F command follows file descriptor",
458 "F command follows file name",
459 NULL
460 }
461 },
462 { OLETTER_NONE, &use_backslash_optname,
463 BOOL, OPT_OFF, &opt_use_backslash, NULL,
464 {
465 "Use backslash escaping in command line parameters",
466 "Don't use backslash escaping in command line parameters",
467 NULL
468 }
469 },
470 { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
471 };
472
473
474 /*
475 * Initialize each option to its default value.
476 */
477 public void
init_option()478 init_option()
479 {
480 register struct loption *o;
481 char *p;
482
483 p = lgetenv("LESS_IS_MORE");
484 if (p != NULL && *p != '\0')
485 less_is_more = 1;
486
487 for (o = option; o->oletter != '\0'; o++)
488 {
489 /*
490 * Set each variable to its default.
491 */
492 if (o->ovar != NULL)
493 *(o->ovar) = o->odefault;
494 if (o->otype & INIT_HANDLER)
495 (*(o->ofunc))(INIT, (char *) NULL);
496 }
497 }
498
499 /*
500 * Find an option in the option table, given its option letter.
501 */
502 public struct loption *
findopt(c)503 findopt(c)
504 int c;
505 {
506 register struct loption *o;
507
508 for (o = option; o->oletter != '\0'; o++)
509 {
510 if (o->oletter == c)
511 return (o);
512 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c)
513 return (o);
514 }
515 return (NULL);
516 }
517
518 /*
519 *
520 */
521 static int
is_optchar(c)522 is_optchar(c)
523 char c;
524 {
525 if (ASCII_IS_UPPER(c))
526 return 1;
527 if (ASCII_IS_LOWER(c))
528 return 1;
529 if (c == '-')
530 return 1;
531 return 0;
532 }
533
534 /*
535 * Find an option in the option table, given its option name.
536 * p_optname is the (possibly partial) name to look for, and
537 * is updated to point after the matched name.
538 * p_oname if non-NULL is set to point to the full option name.
539 */
540 public struct loption *
findopt_name(p_optname,p_oname,p_err)541 findopt_name(p_optname, p_oname, p_err)
542 char **p_optname;
543 char **p_oname;
544 int *p_err;
545 {
546 char *optname = *p_optname;
547 register struct loption *o;
548 register struct optname *oname;
549 register int len;
550 int uppercase;
551 struct loption *maxo = NULL;
552 struct optname *maxoname = NULL;
553 int maxlen = 0;
554 int ambig = 0;
555 int exact = 0;
556
557 /*
558 * Check all options.
559 */
560 for (o = option; o->oletter != '\0'; o++)
561 {
562 /*
563 * Check all names for this option.
564 */
565 for (oname = o->onames; oname != NULL; oname = oname->onext)
566 {
567 /*
568 * Try normal match first (uppercase == 0),
569 * then, then if it's a TRIPLE option,
570 * try uppercase match (uppercase == 1).
571 */
572 for (uppercase = 0; uppercase <= 1; uppercase++)
573 {
574 len = sprefix(optname, oname->oname, uppercase);
575 if (len <= 0 || is_optchar(optname[len]))
576 {
577 /*
578 * We didn't use all of the option name.
579 */
580 continue;
581 }
582 if (!exact && len == maxlen)
583 /*
584 * Already had a partial match,
585 * and now there's another one that
586 * matches the same length.
587 */
588 ambig = 1;
589 else if (len > maxlen)
590 {
591 /*
592 * Found a better match than
593 * the one we had.
594 */
595 maxo = o;
596 maxoname = oname;
597 maxlen = len;
598 ambig = 0;
599 exact = (len == (int)strlen(oname->oname));
600 }
601 if (!(o->otype & TRIPLE))
602 break;
603 }
604 }
605 }
606 if (ambig)
607 {
608 /*
609 * Name matched more than one option.
610 */
611 if (p_err != NULL)
612 *p_err = OPT_AMBIG;
613 return (NULL);
614 }
615 *p_optname = optname + maxlen;
616 if (p_oname != NULL)
617 *p_oname = maxoname == NULL ? NULL : maxoname->oname;
618 return (maxo);
619 }
620