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1.1 etheisen 1: /*
1.6 millert 2: * Copyright (C) 1984-2002 Mark Nudelman
1.1 etheisen 3: *
1.6 millert 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.
1.1 etheisen 6: *
1.6 millert 7: * For more information about less, or for information on how to
8: * contact the author, see the README file.
1.1 etheisen 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 */
1.6 millert 30: public int quit_if_one_screen; /* Quit if EOF on first screen */
31: public int squeeze; /* Squeeze multiple blank lines into one */
1.2 etheisen 32: public int be_helpful; /* more(1) style -d */
1.9 ! deraadt 33: #ifndef SMALL_PROGRAM
1.1 etheisen 34: public int tabstop; /* Tab settings */
1.9 ! deraadt 35: #endif
1.1 etheisen 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 */
1.7 millert 41: public int nohelp; /* Disable the HELP command */
1.6 millert 42: public int bufspace; /* Max buffer space per file (K) */
1.1 etheisen 43: public int ctldisp; /* Send control chars to screen untranslated */
44: public int force_open; /* Open the file even if not regular file */
45: public int swindow; /* Size of scrolling window */
46: public int jump_sline; /* Screen line of "jump target" */
47: public int chopline; /* Truncate displayed lines at screen width */
48: public int no_init; /* Disable sending ti/te termcap strings */
1.6 millert 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 */
1.1 etheisen 55: #if HILITE_SEARCH
56: public int hilite_search; /* Highlight matched search patterns? */
57: #endif
58:
59: /*
1.6 millert 60: * Long option names.
61: */
1.8 millert 62: #if GNU_OPTIONS
1.6 millert 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 L__optname = { "no-lessopen", NULL };
85: static struct optname m_optname = { "long-prompt", NULL };
86: static struct optname n_optname = { "line-numbers", NULL };
87: #if LOGFILE
88: static struct optname o_optname = { "log-file", NULL };
89: static struct optname O__optname = { "LOG-FILE", NULL };
90: #endif
91: static struct optname p_optname = { "pattern", NULL };
92: static struct optname P__optname = { "prompt", NULL };
93: static struct optname q2_optname = { "silent", NULL };
94: static struct optname q_optname = { "quiet", &q2_optname };
95: static struct optname r_optname = { "raw-control-chars", NULL };
96: static struct optname s_optname = { "squeeze-blank-lines", NULL };
97: static struct optname S__optname = { "chop-long-lines", NULL };
98: #if TAGS
99: static struct optname t_optname = { "tag", NULL };
100: static struct optname T__optname = { "tag-file", NULL };
101: #endif
102: static struct optname u_optname = { "underline-special", NULL };
103: static struct optname V__optname = { "version", NULL };
104: static struct optname w_optname = { "hilite-unread", NULL };
105: static struct optname x_optname = { "tabs", NULL };
106: static struct optname X__optname = { "no-init", NULL };
107: static struct optname y_optname = { "max-forw-scroll", NULL };
108: static struct optname z_optname = { "window", NULL };
109: static struct optname quote_optname = { "quotes", NULL };
110: static struct optname tilde_optname = { "tilde", NULL };
111: static struct optname query_optname = { "help", NULL };
112: static struct optname pound_optname = { "shift", NULL };
113: static struct optname keypad_optname = { "no-keypad", NULL };
1.8 millert 114: #else
115: static struct optname fake_optname = { "fake", NULL };
116: #define a_optname fake_optname
117: #define b_optname fake_optname
118: #define B__optname fake_optname
119: #define c_optname fake_optname
120: #define d_optname fake_optname
121: #if MSDOS_COMPILER
122: #define D__optname fake_optname
123: #endif
124: #define e_optname fake_optname
125: #define f_optname fake_optname
126: #define F__optname fake_optname
127: #if HILITE_SEARCH
128: #define g_optname fake_optname
129: #endif
130: #define h_optname fake_optname
131: #define i_optname fake_optname
132: #define j_optname fake_optname
133: #define J__optname fake_optname
134: #if USERFILE
135: #define k_optname fake_optname
136: #endif
137: #define L__optname fake_optname
138: #define m_optname fake_optname
139: #define n_optname fake_optname
140: #if LOGFILE
141: #define o_optname fake_optname
142: #define O__optname fake_optname
143: #endif
144: #define p_optname fake_optname
145: #define P__optname fake_optname
146: #define q2_optname fake_optname
147: #define q_optname fake_optname
148: #define r_optname fake_optname
149: #define s_optname fake_optname
150: #define S__optname fake_optname
151: #if TAGS
152: #define t_optname fake_optname
153: #define T__optname fake_optname
154: #endif
155: #define u_optname fake_optname
156: #define V__optname fake_optname
157: #define w_optname fake_optname
158: #define x_optname fake_optname
159: #define X__optname fake_optname
160: #define y_optname fake_optname
161: #define z_optname fake_optname
162: #define quote_optname fake_optname
163: #define tilde_optname fake_optname
164: #define query_optname fake_optname
165: #define pound_optname fake_optname
166: #define keypad_optname fake_optname
167: #endif
1.6 millert 168:
169:
170: /*
1.1 etheisen 171: * Table of all options and their semantics.
1.6 millert 172: *
173: * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
174: * the description of the option when set to 0, 1 or 2, respectively.
175: * For NUMBER options, odesc[0] is the prompt to use when entering
176: * a new value, and odesc[1] is the description, which should contain
177: * one %d which is replaced by the value of the number.
178: * For STRING options, odesc[0] is the prompt to use when entering
179: * a new value, and odesc[1], if not NULL, is the set of characters
180: * that are valid in the string.
1.1 etheisen 181: */
1.6 millert 182: static struct loption option[] =
1.1 etheisen 183: {
1.6 millert 184: { 'a', &a_optname,
185: BOOL, OPT_OFF, &how_search, NULL,
186: {
187: "Search includes displayed screen",
188: "Search skips displayed screen",
189: NULL
190: }
191: },
192:
193: { 'b', &b_optname,
194: NUMBER|INIT_HANDLER, 64, &bufspace, opt_b,
195: {
196: "Max buffer space per file (K): ",
197: "Max buffer space per file: %dK",
198: NULL
199: }
200: },
201: { 'B', &B__optname,
202: BOOL, OPT_ON, &autobuf, NULL,
203: {
204: "Don't automatically allocate buffers",
205: "Automatically allocate buffers when needed",
206: NULL
207: }
208: },
209: { 'c', &c_optname,
210: TRIPLE, OPT_OFF, &top_scroll, NULL,
211: {
212: "Repaint by scrolling from bottom of screen",
213: "Repaint by clearing each line",
214: "Repaint by painting from top of screen"
215: }
216: },
217: { 'd', &d_optname,
218: BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
219: {
220: "Assume intelligent terminal",
221: "Assume dumb terminal",
222: NULL
223: }
224: },
225: #if MSDOS_COMPILER
226: { 'D', &D__optname,
227: STRING|REPAINT|NO_QUERY, 0, NULL, opt_D,
228: {
229: "color desc: ",
230: "Ddknsu0123456789.",
231: NULL
232: }
233: },
234: #endif
235: { 'e', &e_optname,
236: TRIPLE, OPT_OFF, &quit_at_eof, NULL,
237: {
238: "Don't quit at end-of-file",
239: "Quit at end-of-file",
240: "Quit immediately at end-of-file"
241: }
242: },
243: { 'f', &f_optname,
244: BOOL, OPT_OFF, &force_open, NULL,
245: {
246: "Open only regular files",
247: "Open even non-regular files",
248: NULL
249: }
250: },
251: { 'F', &F__optname,
252: BOOL, OPT_OFF, &quit_if_one_screen, NULL,
253: {
254: "Don't quit if end-of-file on first screen",
255: "Quit if end-of-file on first screen",
256: NULL
257: }
1.1 etheisen 258: },
259: #if HILITE_SEARCH
1.6 millert 260: { 'g', &g_optname,
261: TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
262: {
263: "Don't highlight search matches",
264: "Highlight matches for previous search only",
265: "Highlight all matches for previous search pattern",
266: }
267: },
268: #endif
269: { 'h', &h_optname,
270: NUMBER, -1, &back_scroll, NULL,
271: {
272: "Backwards scroll limit: ",
273: "Backwards scroll limit is %d lines",
1.7 millert 274: NULL
275: }
276: },
277: { 'H', NULL,
278: BOOL|NO_TOGGLE, OPT_OFF, &nohelp, NULL,
279: {
280: "Allow help command",
281: "Don't allow help command",
1.6 millert 282: NULL
283: }
284: },
285: { 'i', &i_optname,
286: TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i,
287: {
288: "Case is significant in searches",
289: "Ignore case in searches",
290: "Ignore case in searches and in patterns"
291: }
292: },
293: { 'j', &j_optname,
294: NUMBER, 1, &jump_sline, NULL,
295: {
296: "Target line: ",
297: "Position target at screen line %d",
298: NULL
299: }
300: },
301: { 'J', &J__optname,
302: BOOL|REPAINT, OPT_OFF, &status_col, NULL,
303: {
304: "Don't display a status column",
305: "Display a status column",
306: NULL
307: }
1.1 etheisen 308: },
309: #if USERFILE
1.6 millert 310: { 'k', &k_optname,
311: STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k,
312: { NULL, NULL, NULL }
1.1 etheisen 313: },
314: #endif
1.6 millert 315: { 'l', NULL,
316: STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_l,
317: { NULL, NULL, NULL }
318: },
319: { 'L', &L__optname,
320: BOOL, OPT_ON, &use_lessopen, NULL,
321: {
322: "Don't use the LESSOPEN filter",
323: "Use the LESSOPEN filter",
324: NULL
325: }
326: },
327: { 'm', &m_optname,
328: TRIPLE, OPT_OFF, &pr_type, NULL,
329: {
330: "Short prompt",
331: "Medium prompt",
332: "Long prompt"
333: }
334: },
335: { 'n', &n_optname,
336: TRIPLE|REPAINT, OPT_ON, &linenums, NULL,
337: {
338: "Don't use line numbers",
339: "Use line numbers",
340: "Constantly display line numbers"
341: }
1.1 etheisen 342: },
343: #if LOGFILE
1.6 millert 344: { 'o', &o_optname,
345: STRING, 0, NULL, opt_o,
346: { "log file: ", NULL, NULL }
347: },
348: { 'O', &O__optname,
349: STRING, 0, NULL, opt__O,
350: { "Log file: ", NULL, NULL }
1.1 etheisen 351: },
352: #endif
1.6 millert 353: { 'p', &p_optname,
354: STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p,
355: { NULL, NULL, NULL }
356: },
357: { 'P', &P__optname,
358: STRING, 0, NULL, opt__P,
359: { "prompt: ", NULL, NULL }
360: },
361: { 'q', &q_optname,
362: TRIPLE, OPT_OFF, &quiet, NULL,
363: {
364: "Ring the bell for errors AND at eof/bof",
365: "Ring the bell for errors but not at eof/bof",
366: "Never ring the bell"
367: }
368: },
369: { 'r', &r_optname,
370: TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL,
371: {
372: "Display control characters as ^X",
373: "Display control characters directly",
374: "Display control characters directly, processing ANSI sequences"
375: }
376: },
377: { 's', &s_optname,
378: BOOL|REPAINT, OPT_OFF, &squeeze, NULL,
379: {
380: "Display all blank lines",
381: "Squeeze multiple blank lines",
382: NULL
383: }
384: },
385: { 'S', &S__optname,
386: BOOL|REPAINT, OPT_OFF, &chopline, NULL,
387: {
388: "Fold long lines",
389: "Chop long lines",
390: NULL
391: }
1.1 etheisen 392: },
393: #if TAGS
1.6 millert 394: { 't', &t_optname,
395: STRING|NO_QUERY, 0, NULL, opt_t,
396: { "tag: ", NULL, NULL }
397: },
398: { 'T', &T__optname,
399: STRING, 0, NULL, opt__T,
400: { "tags file: ", NULL, NULL }
1.1 etheisen 401: },
402: #endif
1.6 millert 403: { 'u', &u_optname,
404: TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL,
405: {
406: "Display underlined text in underline mode",
407: "Backspaces cause overstrike",
408: "Print backspace as ^H"
409: }
410: },
411: { 'V', &V__optname,
412: NOVAR, 0, NULL, opt__V,
413: { NULL, NULL, NULL }
414: },
415: { 'w', &w_optname,
416: TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL,
417: {
418: "Don't highlight first unread line",
419: "Highlight first unread line after forward-screen",
420: "Highlight first unread line after any forward movement",
421: }
422: },
423: { 'x', &x_optname,
424: STRING|REPAINT, 0, NULL, opt_x,
425: {
426: "Tab stops: ",
427: "0123456789,",
428: NULL
429: }
430: },
431: { 'X', &X__optname,
432: BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL,
433: {
434: "Send init/deinit strings to terminal",
435: "Don't use init/deinit strings",
436: NULL
437: }
438: },
439: { 'y', &y_optname,
440: NUMBER, -1, &forw_scroll, NULL,
441: {
442: "Forward scroll limit: ",
443: "Forward scroll limit is %d lines",
444: NULL
445: }
446: },
447: { 'z', &z_optname,
448: NUMBER, -1, &swindow, NULL,
449: {
450: "Scroll window size: ",
451: "Scroll window size is %d lines",
452: NULL
453: }
454: },
455: { '"', "e_optname,
456: STRING, 0, NULL, opt_quote,
457: { "quotes: ", NULL, NULL }
458: },
459: { '~', &tilde_optname,
460: BOOL|REPAINT, OPT_ON, &twiddle, NULL,
461: {
462: "Don't show tildes after end of file",
463: "Show tildes after end of file",
464: NULL
465: }
466: },
467: { '?', &query_optname,
468: NOVAR, 0, NULL, opt_query,
469: { NULL, NULL, NULL }
470: },
471: { '#', £_optname,
472: NUMBER, 0, &shift_count, NULL,
473: {
474: "Horizontal shift: ",
475: "Horizontal shift %d positions",
476: NULL
477: }
478: },
479: { '.', &keypad_optname,
480: BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
481: {
482: "Use keypad mode",
483: "Don't use keypad mode",
484: NULL
485: }
1.1 etheisen 486: },
1.6 millert 487: { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
1.1 etheisen 488: };
489:
490:
491: /*
492: * Initialize each option to its default value.
493: */
494: public void
495: init_option()
496: {
1.6 millert 497: register struct loption *o;
498: extern int ismore;
1.1 etheisen 499:
500: for (o = option; o->oletter != '\0'; o++)
501: {
502: /*
1.6 millert 503: * Replace less's -d option if invoked as more
504: */
505: if (ismore && o->oletter == 'd')
506: {
507: o->onames = NULL;
508: o->otype = BOOL;
509: o->odefault = OPT_OFF;
510: o->ovar = &be_helpful;
511: o->ofunc = NULL;
512: o->odesc[0] = "Be less helpful in prompts";
513: o->odesc[1] = "Be helpful in prompts";
514: o->odesc[2] = NULL;
515: }
516:
517: /*
1.1 etheisen 518: * Set each variable to its default.
519: */
520: if (o->ovar != NULL)
521: *(o->ovar) = o->odefault;
1.6 millert 522: if (o->otype & INIT_HANDLER)
523: (*(o->ofunc))(INIT, (char *) NULL);
1.1 etheisen 524: }
525: }
526:
527: /*
1.6 millert 528: * Find an option in the option table, given its option letter.
1.1 etheisen 529: */
1.6 millert 530: public struct loption *
1.1 etheisen 531: findopt(c)
532: int c;
533: {
1.6 millert 534: register struct loption *o;
1.1 etheisen 535:
536: for (o = option; o->oletter != '\0'; o++)
537: {
538: if (o->oletter == c)
539: return (o);
540: if ((o->otype & TRIPLE) && toupper(o->oletter) == c)
541: return (o);
542: }
543: return (NULL);
1.6 millert 544: }
545:
546: /*
547: *
548: */
549: static int
550: is_optchar(c)
551: char c;
552: {
553: if (SIMPLE_IS_UPPER(c))
554: return 1;
555: if (SIMPLE_IS_LOWER(c))
556: return 1;
557: if (c == '-')
558: return 1;
559: return 0;
560: }
561:
1.8 millert 562: #if GNU_OPTIONS
1.6 millert 563: /*
564: * Find an option in the option table, given its option name.
565: * p_optname is the (possibly partial) name to look for, and
566: * is updated to point after the matched name.
567: * p_oname if non-NULL is set to point to the full option name.
568: */
569: public struct loption *
570: findopt_name(p_optname, p_oname, p_err)
571: char **p_optname;
572: char **p_oname;
573: int *p_err;
574: {
575: char *optname = *p_optname;
576: register struct loption *o;
577: register struct optname *oname;
578: register int len;
579: int uppercase;
580: struct loption *maxo = NULL;
581: struct optname *maxoname = NULL;
582: int maxlen = 0;
583: int ambig = 0;
584: int exact = 0;
585:
586: /*
587: * Check all options.
588: */
589: for (o = option; o->oletter != '\0'; o++)
590: {
591: /*
592: * Check all names for this option.
593: */
594: for (oname = o->onames; oname != NULL; oname = oname->onext)
595: {
596: /*
597: * Try normal match first (uppercase == 0),
598: * then, then if it's a TRIPLE option,
599: * try uppercase match (uppercase == 1).
600: */
601: for (uppercase = 0; uppercase <= 1; uppercase++)
602: {
603: len = sprefix(optname, oname->oname, uppercase);
604: if (len <= 0 || is_optchar(optname[len]))
605: {
606: /*
607: * We didn't use all of the option name.
608: */
609: continue;
610: }
611: if (!exact && len == maxlen)
612: /*
613: * Already had a partial match,
614: * and now there's another one that
615: * matches the same length.
616: */
617: ambig = 1;
618: else if (len > maxlen)
619: {
620: /*
621: * Found a better match than
622: * the one we had.
623: */
624: maxo = o;
625: maxoname = oname;
626: maxlen = len;
627: ambig = 0;
628: exact = (len == (int)strlen(oname->oname));
629: }
630: if (!(o->otype & TRIPLE))
631: break;
632: }
633: }
634: }
635: if (ambig)
636: {
637: /*
638: * Name matched more than one option.
639: */
640: if (p_err != NULL)
641: *p_err = OPT_AMBIG;
642: return (NULL);
643: }
644: *p_optname = optname + maxlen;
645: if (p_oname != NULL)
646: *p_oname = maxoname == NULL ? NULL : maxoname->oname;
647: return (maxo);
1.1 etheisen 648: }
1.8 millert 649: #endif