Nuke net/intrq.[ch] and ipintrq related bits; they were gone almost three
[dragonfly.git] / contrib / less-4 / opttbl.c
1 /*
2  * Copyright (C) 1984-2007  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 about less, or for information on how to 
8  * contact the author, see the README file.
9  */
10
11
12 /*
13  * The option table.
14  */
15
16 #include "less.h"
17 #include "option.h"
18
19 /*
20  * Variables controlled by command line options.
21  */
22 public int quiet;               /* Should we suppress the audible 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 int chopline;            /* Truncate displayed lines at screen width */
45 public int no_init;             /* Disable sending ti/te termcap strings */
46 public int no_keypad;           /* Disable sending ks/ke termcap strings */
47 public int twiddle;             /* Show tildes after EOF */
48 public int show_attn;           /* Hilite first unread line */
49 public int shift_count;         /* Number of positions to shift horizontally */
50 public int status_col;          /* Display a status column */
51 public int use_lessopen;        /* Use the LESSOPEN filter */
52 public int quit_on_intr;        /* Quit on interrupt */
53 public int oldbot;              /* Old bottom of screen behavior */
54 #if HILITE_SEARCH
55 public int hilite_search;       /* Highlight matched search patterns? */
56 #endif
57
58 public int less_is_more = 0;    /* Make compatible with POSIX more */
59
60 /*
61  * Long option names.
62  */
63 static struct optname a_optname      = { "search-skip-screen",   NULL };
64 static struct optname b_optname      = { "buffers",              NULL };
65 static struct optname B__optname     = { "auto-buffers",         NULL };
66 static struct optname c_optname      = { "clear-screen",         NULL };
67 static struct optname d_optname      = { "dumb",                 NULL };
68 #if MSDOS_COMPILER
69 static struct optname D__optname     = { "color",                NULL };
70 #endif
71 static struct optname e_optname      = { "quit-at-eof",          NULL };
72 static struct optname f_optname      = { "force",                NULL };
73 static struct optname F__optname     = { "quit-if-one-screen",   NULL };
74 #if HILITE_SEARCH
75 static struct optname g_optname      = { "hilite-search",        NULL };
76 #endif
77 static struct optname h_optname      = { "max-back-scroll",      NULL };
78 static struct optname i_optname      = { "ignore-case",          NULL };
79 static struct optname j_optname      = { "jump-target",          NULL };
80 static struct optname J__optname     = { "status-column",        NULL };
81 #if USERFILE
82 static struct optname k_optname      = { "lesskey-file",         NULL };
83 #endif
84 static struct optname K__optname     = { "quit-on-intr",         NULL };
85 static struct optname L__optname     = { "no-lessopen",          NULL };
86 static struct optname m_optname      = { "long-prompt",          NULL };
87 static struct optname n_optname      = { "line-numbers",         NULL };
88 #if LOGFILE
89 static struct optname o_optname      = { "log-file",             NULL };
90 static struct optname O__optname     = { "LOG-FILE",             NULL };
91 #endif
92 static struct optname p_optname      = { "pattern",              NULL };
93 static struct optname P__optname     = { "prompt",               NULL };
94 static struct optname q2_optname     = { "silent",               NULL };
95 static struct optname q_optname      = { "quiet",                &q2_optname };
96 static struct optname r_optname      = { "raw-control-chars",    NULL };
97 static struct optname s_optname      = { "squeeze-blank-lines",  NULL };
98 static struct optname S__optname     = { "chop-long-lines",      NULL };
99 #if TAGS
100 static struct optname t_optname      = { "tag",                  NULL };
101 static struct optname T__optname     = { "tag-file",             NULL };
102 #endif
103 static struct optname u_optname      = { "underline-special",    NULL };
104 static struct optname V__optname     = { "version",              NULL };
105 static struct optname w_optname      = { "hilite-unread",        NULL };
106 static struct optname x_optname      = { "tabs",                 NULL };
107 static struct optname X__optname     = { "no-init",              NULL };
108 static struct optname y_optname      = { "max-forw-scroll",      NULL };
109 static struct optname z_optname      = { "window",               NULL };
110 static struct optname quote_optname  = { "quotes",               NULL };
111 static struct optname tilde_optname  = { "tilde",                NULL };
112 static struct optname query_optname  = { "help",                 NULL };
113 static struct optname pound_optname  = { "shift",                NULL };
114 static struct optname keypad_optname = { "no-keypad",            NULL };
115 static struct optname oldbot_optname = { "old-bot",              NULL };
116
117
118 /*
119  * Table of all options and their semantics.
120  *
121  * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
122  * the description of the option when set to 0, 1 or 2, respectively.
123  * For NUMBER options, odesc[0] is the prompt to use when entering
124  * a new value, and odesc[1] is the description, which should contain 
125  * one %d which is replaced by the value of the number.
126  * For STRING options, odesc[0] is the prompt to use when entering
127  * a new value, and odesc[1], if not NULL, is the set of characters
128  * that are valid in the string.
129  */
130 static struct loption option[] =
131 {
132         { 'a', &a_optname,
133                 BOOL, OPT_OFF, &how_search, NULL,
134                 {
135                         "Search includes displayed screen",
136                         "Search skips displayed screen",
137                         NULL
138                 }
139         },
140
141         { 'b', &b_optname,
142                 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b, 
143                 {
144                         "Max buffer space per file (K): ",
145                         "Max buffer space per file: %dK",
146                         NULL
147                 }
148         },
149         { 'B', &B__optname,
150                 BOOL, OPT_ON, &autobuf, NULL,
151                 {
152                         "Don't automatically allocate buffers",
153                         "Automatically allocate buffers when needed",
154                         NULL
155                 }
156         },
157         { 'c', &c_optname,
158                 TRIPLE, OPT_OFF, &top_scroll, NULL,
159                 {
160                         "Repaint by scrolling from bottom of screen",
161                         "Repaint by painting from top of screen",
162                         "Repaint by painting from top of screen"
163                 }
164         },
165         { 'd', &d_optname,
166                 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
167                 {
168                         "Assume intelligent terminal",
169                         "Assume dumb terminal",
170                         NULL
171                 }
172         },
173 #if MSDOS_COMPILER
174         { 'D', &D__optname,
175                 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D,
176                 {
177                         "color desc: ", 
178                         "Ddknsu0123456789.",
179                         NULL
180                 }
181         },
182 #endif
183         { 'e', &e_optname,
184                 TRIPLE, OPT_OFF, &quit_at_eof, NULL,
185                 {
186                         "Don't quit at end-of-file",
187                         "Quit at end-of-file",
188                         "Quit immediately at end-of-file"
189                 }
190         },
191         { 'f', &f_optname,
192                 BOOL, OPT_OFF, &force_open, NULL,
193                 {
194                         "Open only regular files",
195                         "Open even non-regular files",
196                         NULL
197                 }
198         },
199         { 'F', &F__optname,
200                 BOOL, OPT_OFF, &quit_if_one_screen, NULL,
201                 {
202                         "Don't quit if end-of-file on first screen",
203                         "Quit if end-of-file on first screen",
204                         NULL
205                 }
206         },
207 #if HILITE_SEARCH
208         { 'g', &g_optname,
209                 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
210                 {
211                         "Don't highlight search matches",
212                         "Highlight matches for previous search only",
213                         "Highlight all matches for previous search pattern",
214                 }
215         },
216 #endif
217         { 'h', &h_optname,
218                 NUMBER, -1, &back_scroll, NULL,
219                 {
220                         "Backwards scroll limit: ",
221                         "Backwards scroll limit is %d lines",
222                         NULL
223                 }
224         },
225         { 'i', &i_optname,
226                 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i,
227                 {
228                         "Case is significant in searches",
229                         "Ignore case in searches",
230                         "Ignore case in searches and in patterns"
231                 }
232         },
233         { 'j', &j_optname,
234                 STRING, 0, NULL, opt_j,
235                 {
236                         "Target line: ",
237                         "0123456789.",
238                         NULL
239                 }
240         },
241         { 'J', &J__optname,
242                 BOOL|REPAINT, OPT_OFF, &status_col, NULL,
243                 {
244                         "Don't display a status column",
245                         "Display a status column",
246                         NULL
247                 }
248         },
249 #if USERFILE
250         { 'k', &k_optname,
251                 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k,
252                 { NULL, NULL, NULL }
253         },
254 #endif
255         { 'K', &K__optname,
256                 BOOL, OPT_OFF, &quit_on_intr, NULL,
257                 {
258                         "Interrupt (ctrl-C) returns to prompt",
259                         "Interrupt (ctrl-C) exits less",
260                         NULL
261                 }
262         },
263         { 'l', NULL,
264                 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_l,
265                 { NULL, NULL, NULL }
266         },
267         { 'L', &L__optname,
268                 BOOL, OPT_ON, &use_lessopen, NULL,
269                 {
270                         "Don't use the LESSOPEN filter",
271                         "Use the LESSOPEN filter",
272                         NULL
273                 }
274         },
275         { 'm', &m_optname,
276                 TRIPLE, OPT_OFF, &pr_type, NULL,
277                 {
278                         "Short prompt",
279                         "Medium prompt",
280                         "Long prompt"
281                 }
282         },
283         { 'n', &n_optname,
284                 TRIPLE|REPAINT, OPT_ON, &linenums, NULL,
285                 {
286                         "Don't use line numbers",
287                         "Use line numbers",
288                         "Constantly display line numbers"
289                 }
290         },
291 #if LOGFILE
292         { 'o', &o_optname,
293                 STRING, 0, NULL, opt_o,
294                 { "log file: ", NULL, NULL }
295         },
296         { 'O', &O__optname,
297                 STRING, 0, NULL, opt__O,
298                 { "Log file: ", NULL, NULL }
299         },
300 #endif
301         { 'p', &p_optname,
302                 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p,
303                 { NULL, NULL, NULL }
304         },
305         { 'P', &P__optname,
306                 STRING, 0, NULL, opt__P,
307                 { "prompt: ", NULL, NULL }
308         },
309         { 'q', &q_optname,
310                 TRIPLE, OPT_OFF, &quiet, NULL,
311                 {
312                         "Ring the bell for errors AND at eof/bof",
313                         "Ring the bell for errors but not at eof/bof",
314                         "Never ring the bell"
315                 }
316         },
317         { 'r', &r_optname,
318                 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL,
319                 {
320                         "Display control characters as ^X",
321                         "Display control characters directly",
322                         "Display control characters directly, processing ANSI sequences"
323                 }
324         },
325         { 's', &s_optname,
326                 BOOL|REPAINT, OPT_OFF, &squeeze, NULL,
327                 {
328                         "Display all blank lines",
329                         "Squeeze multiple blank lines",
330                         NULL
331                 }
332         },
333         { 'S', &S__optname,
334                 BOOL|REPAINT, OPT_OFF, &chopline, NULL,
335                 {
336                         "Fold long lines",
337                         "Chop long lines",
338                         NULL
339                 }
340         },
341 #if TAGS
342         { 't', &t_optname,
343                 STRING|NO_QUERY, 0, NULL, opt_t,
344                 { "tag: ", NULL, NULL }
345         },
346         { 'T', &T__optname,
347                 STRING, 0, NULL, opt__T,
348                 { "tags file: ", NULL, NULL }
349         },
350 #endif
351         { 'u', &u_optname,
352                 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL,
353                 {
354                         "Display underlined text in underline mode",
355                         "Backspaces cause overstrike",
356                         "Print backspace as ^H"
357                 }
358         },
359         { 'V', &V__optname,
360                 NOVAR, 0, NULL, opt__V,
361                 { NULL, NULL, NULL }
362         },
363         { 'w', &w_optname,
364                 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL,
365                 {
366                         "Don't highlight first unread line",
367                         "Highlight first unread line after forward-screen",
368                         "Highlight first unread line after any forward movement",
369                 }
370         },
371         { 'x', &x_optname,
372                 STRING|REPAINT, 0, NULL, opt_x,
373                 {
374                         "Tab stops: ",
375                         "0123456789,",
376                         NULL
377                 }
378         },
379         { 'X', &X__optname,
380                 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL,
381                 {
382                         "Send init/deinit strings to terminal",
383                         "Don't use init/deinit strings",
384                         NULL
385                 }
386         },
387         { 'y', &y_optname,
388                 NUMBER, -1, &forw_scroll, NULL,
389                 {
390                         "Forward scroll limit: ",
391                         "Forward scroll limit is %d lines",
392                         NULL
393                 }
394         },
395         { 'z', &z_optname,
396                 NUMBER, -1, &swindow, NULL,
397                 {
398                         "Scroll window size: ",
399                         "Scroll window size is %d lines",
400                         NULL
401                 }
402         },
403         { '"', &quote_optname,
404                 STRING, 0, NULL, opt_quote,
405                 { "quotes: ", NULL, NULL }
406         },
407         { '~', &tilde_optname,
408                 BOOL|REPAINT, OPT_ON, &twiddle, NULL,
409                 {
410                         "Don't show tildes after end of file",
411                         "Show tildes after end of file",
412                         NULL
413                 }
414         },
415         { '?', &query_optname,
416                 NOVAR, 0, NULL, opt_query,
417                 { NULL, NULL, NULL }
418         },
419         { '#', &pound_optname,
420                 NUMBER, 0, &shift_count, NULL,
421                 {
422                         "Horizontal shift: ",
423                         "Horizontal shift %d positions",
424                         NULL
425                 }
426         },
427         { '.', &keypad_optname,
428                 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
429                 {
430                         "Use keypad mode",
431                         "Don't use keypad mode",
432                         NULL
433                 }
434         },
435         { '.', &oldbot_optname,
436                 BOOL, OPT_OFF, &oldbot, NULL,
437                 {
438                         "Use new bottom of screen behavior",
439                         "Use old bottom of screen behavior",
440                         NULL
441                 }
442         },
443         { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
444 };
445
446
447 /*
448  * Initialize each option to its default value.
449  */
450         public void
451 init_option()
452 {
453         register struct loption *o;
454         char *p;
455
456         p = lgetenv("LESS_IS_MORE");
457         if (p != NULL && *p != '\0')
458                 less_is_more = 1;
459
460         for (o = option;  o->oletter != '\0';  o++)
461         {
462                 /*
463                  * Set each variable to its default.
464                  */
465                 if (o->ovar != NULL)
466                         *(o->ovar) = o->odefault;
467                 if (o->otype & INIT_HANDLER)
468                         (*(o->ofunc))(INIT, (char *) NULL);
469         }
470 }
471
472 /*
473  * Find an option in the option table, given its option letter.
474  */
475         public struct loption *
476 findopt(c)
477         int c;
478 {
479         register struct loption *o;
480
481         for (o = option;  o->oletter != '\0';  o++)
482         {
483                 if (o->oletter == c)
484                         return (o);
485                 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c)
486                         return (o);
487         }
488         return (NULL);
489 }
490
491 /*
492  *
493  */
494         static int
495 is_optchar(c)
496         char c;
497 {
498         if (ASCII_IS_UPPER(c))
499                 return 1;
500         if (ASCII_IS_LOWER(c))
501                 return 1;
502         if (c == '-')
503                 return 1;
504         return 0;
505 }
506
507 /*
508  * Find an option in the option table, given its option name.
509  * p_optname is the (possibly partial) name to look for, and
510  * is updated to point after the matched name.
511  * p_oname if non-NULL is set to point to the full option name.
512  */
513         public struct loption *
514 findopt_name(p_optname, p_oname, p_err)
515         char **p_optname;
516         char **p_oname;
517         int *p_err;
518 {
519         char *optname = *p_optname;
520         register struct loption *o;
521         register struct optname *oname;
522         register int len;
523         int uppercase;
524         struct loption *maxo = NULL;
525         struct optname *maxoname = NULL;
526         int maxlen = 0;
527         int ambig = 0;
528         int exact = 0;
529
530         /*
531          * Check all options.
532          */
533         for (o = option;  o->oletter != '\0';  o++)
534         {
535                 /*
536                  * Check all names for this option.
537                  */
538                 for (oname = o->onames;  oname != NULL;  oname = oname->onext)
539                 {
540                         /* 
541                          * Try normal match first (uppercase == 0),
542                          * then, then if it's a TRIPLE option,
543                          * try uppercase match (uppercase == 1).
544                          */
545                         for (uppercase = 0;  uppercase <= 1;  uppercase++)
546                         {
547                                 len = sprefix(optname, oname->oname, uppercase);
548                                 if (len <= 0 || is_optchar(optname[len]))
549                                 {
550                                         /*
551                                          * We didn't use all of the option name.
552                                          */
553                                         continue;
554                                 }
555                                 if (!exact && len == maxlen)
556                                         /*
557                                          * Already had a partial match,
558                                          * and now there's another one that
559                                          * matches the same length.
560                                          */
561                                         ambig = 1;
562                                 else if (len > maxlen)
563                                 {
564                                         /*
565                                          * Found a better match than
566                                          * the one we had.
567                                          */
568                                         maxo = o;
569                                         maxoname = oname;
570                                         maxlen = len;
571                                         ambig = 0;
572                                         exact = (len == (int)strlen(oname->oname));
573                                 }
574                                 if (!(o->otype & TRIPLE))
575                                         break;
576                         }
577                 }
578         }
579         if (ambig)
580         {
581                 /*
582                  * Name matched more than one option.
583                  */
584                 if (p_err != NULL)
585                         *p_err = OPT_AMBIG;
586                 return (NULL);
587         }
588         *p_optname = optname + maxlen;
589         if (p_oname != NULL)
590                 *p_oname = maxoname == NULL ? NULL : maxoname->oname;
591         return (maxo);
592 }