Annotation of src/usr.bin/less/opttbl.c, Revision 1.13
1.1 etheisen 1: /*
1.12 shadchin 2: * Copyright (C) 1984-2012 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: *
1.12 shadchin 7: * For more information, see the README file.
1.1 etheisen 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 how_search; /* Where should forward searches start? */
23: public int top_scroll; /* Repaint screen from top?
24: (alternative is scroll from bottom) */
25: public int pr_type; /* Type of prompt (short, medium, long) */
26: public int bs_mode; /* How to process backspaces */
27: public int know_dumb; /* Don't complain about dumb terminals */
28: public int quit_at_eof; /* Quit after hitting end of file twice */
1.6 millert 29: public int quit_if_one_screen; /* Quit if EOF on first screen */
30: public int squeeze; /* Squeeze multiple blank lines into one */
1.1 etheisen 31: public int tabstop; /* Tab settings */
32: public int back_scroll; /* Repaint screen on backwards movement */
33: public int forw_scroll; /* Repaint screen on forward movement */
34: public int caseless; /* Do "caseless" searches */
35: public int linenums; /* Use line numbers */
36: public int autobuf; /* Automatically allocate buffers as needed */
1.6 millert 37: public int bufspace; /* Max buffer space per file (K) */
1.1 etheisen 38: public int ctldisp; /* Send control chars to screen untranslated */
39: public int force_open; /* Open the file even if not regular file */
40: public int swindow; /* Size of scrolling window */
41: public int jump_sline; /* Screen line of "jump target" */
1.10 shadchin 42: public long jump_sline_fraction = -1;
43: public long shift_count_fraction = -1;
1.1 etheisen 44: public int chopline; /* Truncate displayed lines at screen width */
45: public int no_init; /* Disable sending ti/te termcap strings */
1.6 millert 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 */
1.10 shadchin 52: public int quit_on_intr; /* Quit on interrupt */
53: public int follow_mode; /* F cmd Follows file desc or file name? */
54: public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */
1.12 shadchin 55: public int opt_use_backslash; /* Use backslash escaping in option parsing */
1.1 etheisen 56: #if HILITE_SEARCH
57: public int hilite_search; /* Highlight matched search patterns? */
58: #endif
59:
1.10 shadchin 60: public int less_is_more = 0; /* Make compatible with POSIX more */
61:
1.1 etheisen 62: /*
1.6 millert 63: * Long option names.
64: */
1.8 millert 65: #if GNU_OPTIONS
1.6 millert 66: static struct optname a_optname = { "search-skip-screen", NULL };
67: static struct optname b_optname = { "buffers", NULL };
68: static struct optname B__optname = { "auto-buffers", NULL };
69: static struct optname c_optname = { "clear-screen", NULL };
70: static struct optname d_optname = { "dumb", NULL };
71: #if MSDOS_COMPILER
72: static struct optname D__optname = { "color", NULL };
73: #endif
74: static struct optname e_optname = { "quit-at-eof", NULL };
75: static struct optname f_optname = { "force", NULL };
76: static struct optname F__optname = { "quit-if-one-screen", NULL };
77: #if HILITE_SEARCH
78: static struct optname g_optname = { "hilite-search", NULL };
79: #endif
80: static struct optname h_optname = { "max-back-scroll", NULL };
81: static struct optname i_optname = { "ignore-case", NULL };
82: static struct optname j_optname = { "jump-target", NULL };
83: static struct optname J__optname = { "status-column", NULL };
84: #if USERFILE
85: static struct optname k_optname = { "lesskey-file", NULL };
86: #endif
1.10 shadchin 87: static struct optname K__optname = { "quit-on-intr", NULL };
1.6 millert 88: static struct optname L__optname = { "no-lessopen", NULL };
89: static struct optname m_optname = { "long-prompt", NULL };
90: static struct optname n_optname = { "line-numbers", NULL };
91: #if LOGFILE
92: static struct optname o_optname = { "log-file", NULL };
93: static struct optname O__optname = { "LOG-FILE", NULL };
94: #endif
95: static struct optname p_optname = { "pattern", NULL };
96: static struct optname P__optname = { "prompt", NULL };
97: static struct optname q2_optname = { "silent", NULL };
98: static struct optname q_optname = { "quiet", &q2_optname };
99: static struct optname r_optname = { "raw-control-chars", NULL };
100: static struct optname s_optname = { "squeeze-blank-lines", NULL };
101: static struct optname S__optname = { "chop-long-lines", NULL };
102: #if TAGS
103: static struct optname t_optname = { "tag", NULL };
104: static struct optname T__optname = { "tag-file", NULL };
105: #endif
106: static struct optname u_optname = { "underline-special", NULL };
107: static struct optname V__optname = { "version", NULL };
108: static struct optname w_optname = { "hilite-unread", NULL };
109: static struct optname x_optname = { "tabs", NULL };
110: static struct optname X__optname = { "no-init", NULL };
111: static struct optname y_optname = { "max-forw-scroll", NULL };
112: static struct optname z_optname = { "window", NULL };
113: static struct optname quote_optname = { "quotes", NULL };
114: static struct optname tilde_optname = { "tilde", NULL };
115: static struct optname query_optname = { "help", NULL };
116: static struct optname pound_optname = { "shift", NULL };
117: static struct optname keypad_optname = { "no-keypad", NULL };
1.10 shadchin 118: static struct optname oldbot_optname = { "old-bot", NULL };
119: static struct optname follow_optname = { "follow-name", NULL };
1.12 shadchin 120: static struct optname use_backslash_optname = { "use-backslash", NULL };
1.8 millert 121: #else
122: static struct optname fake_optname = { "fake", NULL };
123: #define a_optname fake_optname
124: #define b_optname fake_optname
125: #define B__optname fake_optname
126: #define c_optname fake_optname
127: #define d_optname fake_optname
128: #if MSDOS_COMPILER
129: #define D__optname fake_optname
130: #endif
131: #define e_optname fake_optname
132: #define f_optname fake_optname
133: #define F__optname fake_optname
134: #if HILITE_SEARCH
135: #define g_optname fake_optname
136: #endif
137: #define h_optname fake_optname
138: #define i_optname fake_optname
139: #define j_optname fake_optname
140: #define J__optname fake_optname
141: #if USERFILE
142: #define k_optname fake_optname
143: #endif
1.10 shadchin 144: #define K__optname fake_optname
1.8 millert 145: #define L__optname fake_optname
146: #define m_optname fake_optname
147: #define n_optname fake_optname
148: #if LOGFILE
149: #define o_optname fake_optname
150: #define O__optname fake_optname
151: #endif
152: #define p_optname fake_optname
153: #define P__optname fake_optname
154: #define q2_optname fake_optname
155: #define q_optname fake_optname
156: #define r_optname fake_optname
157: #define s_optname fake_optname
158: #define S__optname fake_optname
159: #if TAGS
160: #define t_optname fake_optname
161: #define T__optname fake_optname
162: #endif
163: #define u_optname fake_optname
164: #define V__optname fake_optname
165: #define w_optname fake_optname
166: #define x_optname fake_optname
167: #define X__optname fake_optname
168: #define y_optname fake_optname
169: #define z_optname fake_optname
170: #define quote_optname fake_optname
171: #define tilde_optname fake_optname
172: #define query_optname fake_optname
173: #define pound_optname fake_optname
174: #define keypad_optname fake_optname
1.10 shadchin 175: #define oldbot_optname fake_optname
176: #define follow_optname fake_optname
1.12 shadchin 177: #define use_backslash_optname fake_optname
1.8 millert 178: #endif
1.6 millert 179:
180:
181: /*
1.1 etheisen 182: * Table of all options and their semantics.
1.6 millert 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.
1.1 etheisen 192: */
1.6 millert 193: static struct loption option[] =
1.1 etheisen 194: {
1.6 millert 195: { 'a', &a_optname,
1.10 shadchin 196: TRIPLE, OPT_ONPLUS, &how_search, NULL,
1.6 millert 197: {
198: "Search includes displayed screen",
199: "Search skips displayed screen",
1.10 shadchin 200: "Search includes all of displayed screen"
1.6 millert 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,
1.11 nicm 221: TRIPLE, OPT_ON, &top_scroll, NULL,
1.6 millert 222: {
223: "Repaint by scrolling from bottom of screen",
1.10 shadchin 224: "Repaint by painting from top of screen",
1.6 millert 225: "Repaint by painting from top of screen"
226: }
227: },
228: { 'd', &d_optname,
229: BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
230: {
231: "Assume intelligent terminal",
232: "Assume dumb terminal",
233: NULL
234: }
235: },
236: #if MSDOS_COMPILER
237: { 'D', &D__optname,
238: STRING|REPAINT|NO_QUERY, 0, NULL, opt_D,
239: {
240: "color desc: ",
241: "Ddknsu0123456789.",
242: NULL
243: }
244: },
245: #endif
246: { 'e', &e_optname,
247: TRIPLE, OPT_OFF, &quit_at_eof, NULL,
248: {
249: "Don't quit at end-of-file",
250: "Quit at end-of-file",
251: "Quit immediately at end-of-file"
252: }
253: },
254: { 'f', &f_optname,
255: BOOL, OPT_OFF, &force_open, NULL,
256: {
257: "Open only regular files",
258: "Open even non-regular files",
259: NULL
260: }
261: },
262: { 'F', &F__optname,
263: BOOL, OPT_OFF, &quit_if_one_screen, NULL,
264: {
265: "Don't quit if end-of-file on first screen",
266: "Quit if end-of-file on first screen",
267: NULL
268: }
1.1 etheisen 269: },
270: #if HILITE_SEARCH
1.6 millert 271: { 'g', &g_optname,
272: TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
273: {
274: "Don't highlight search matches",
275: "Highlight matches for previous search only",
276: "Highlight all matches for previous search pattern",
277: }
278: },
279: #endif
280: { 'h', &h_optname,
281: NUMBER, -1, &back_scroll, NULL,
282: {
283: "Backwards scroll limit: ",
284: "Backwards scroll limit is %d lines",
1.7 millert 285: NULL
286: }
287: },
1.6 millert 288: { 'i', &i_optname,
289: TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i,
290: {
291: "Case is significant in searches",
292: "Ignore case in searches",
293: "Ignore case in searches and in patterns"
294: }
295: },
296: { 'j', &j_optname,
1.10 shadchin 297: STRING, 0, NULL, opt_j,
1.6 millert 298: {
299: "Target line: ",
1.10 shadchin 300: "0123456789.-",
1.6 millert 301: NULL
302: }
303: },
304: { 'J', &J__optname,
305: BOOL|REPAINT, OPT_OFF, &status_col, NULL,
306: {
307: "Don't display a status column",
308: "Display a status column",
309: NULL
310: }
1.1 etheisen 311: },
312: #if USERFILE
1.6 millert 313: { 'k', &k_optname,
314: STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k,
315: { NULL, NULL, NULL }
1.1 etheisen 316: },
317: #endif
1.10 shadchin 318: { 'K', &K__optname,
319: BOOL, OPT_OFF, &quit_on_intr, NULL,
320: {
321: "Interrupt (ctrl-C) returns to prompt",
322: "Interrupt (ctrl-C) exits less",
323: NULL
324: }
1.6 millert 325: },
326: { 'L', &L__optname,
327: BOOL, OPT_ON, &use_lessopen, NULL,
328: {
329: "Don't use the LESSOPEN filter",
330: "Use the LESSOPEN filter",
331: NULL
332: }
333: },
334: { 'm', &m_optname,
335: TRIPLE, OPT_OFF, &pr_type, NULL,
336: {
337: "Short prompt",
338: "Medium prompt",
339: "Long prompt"
340: }
341: },
342: { 'n', &n_optname,
343: TRIPLE|REPAINT, OPT_ON, &linenums, NULL,
344: {
345: "Don't use line numbers",
346: "Use line numbers",
347: "Constantly display line numbers"
348: }
1.1 etheisen 349: },
350: #if LOGFILE
1.6 millert 351: { 'o', &o_optname,
352: STRING, 0, NULL, opt_o,
353: { "log file: ", NULL, NULL }
354: },
355: { 'O', &O__optname,
356: STRING, 0, NULL, opt__O,
357: { "Log file: ", NULL, NULL }
1.1 etheisen 358: },
359: #endif
1.6 millert 360: { 'p', &p_optname,
361: STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p,
362: { NULL, NULL, NULL }
363: },
364: { 'P', &P__optname,
365: STRING, 0, NULL, opt__P,
366: { "prompt: ", NULL, NULL }
367: },
368: { 'q', &q_optname,
369: TRIPLE, OPT_OFF, &quiet, NULL,
370: {
371: "Ring the bell for errors AND at eof/bof",
372: "Ring the bell for errors but not at eof/bof",
373: "Never ring the bell"
374: }
375: },
376: { 'r', &r_optname,
377: TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL,
378: {
379: "Display control characters as ^X",
380: "Display control characters directly",
381: "Display control characters directly, processing ANSI sequences"
382: }
383: },
384: { 's', &s_optname,
385: BOOL|REPAINT, OPT_OFF, &squeeze, NULL,
386: {
387: "Display all blank lines",
388: "Squeeze multiple blank lines",
389: NULL
390: }
391: },
392: { 'S', &S__optname,
393: BOOL|REPAINT, OPT_OFF, &chopline, NULL,
394: {
395: "Fold long lines",
396: "Chop long lines",
397: NULL
398: }
1.1 etheisen 399: },
400: #if TAGS
1.6 millert 401: { 't', &t_optname,
402: STRING|NO_QUERY, 0, NULL, opt_t,
403: { "tag: ", NULL, NULL }
404: },
405: { 'T', &T__optname,
406: STRING, 0, NULL, opt__T,
407: { "tags file: ", NULL, NULL }
1.1 etheisen 408: },
409: #endif
1.6 millert 410: { 'u', &u_optname,
411: TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL,
412: {
413: "Display underlined text in underline mode",
414: "Backspaces cause overstrike",
415: "Print backspace as ^H"
416: }
417: },
418: { 'V', &V__optname,
419: NOVAR, 0, NULL, opt__V,
420: { NULL, NULL, NULL }
421: },
422: { 'w', &w_optname,
423: TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL,
424: {
425: "Don't highlight first unread line",
426: "Highlight first unread line after forward-screen",
427: "Highlight first unread line after any forward movement",
428: }
429: },
430: { 'x', &x_optname,
431: STRING|REPAINT, 0, NULL, opt_x,
432: {
433: "Tab stops: ",
434: "0123456789,",
435: NULL
436: }
437: },
438: { 'X', &X__optname,
439: BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL,
440: {
441: "Send init/deinit strings to terminal",
442: "Don't use init/deinit strings",
443: NULL
444: }
445: },
446: { 'y', &y_optname,
447: NUMBER, -1, &forw_scroll, NULL,
448: {
449: "Forward scroll limit: ",
450: "Forward scroll limit is %d lines",
451: NULL
452: }
453: },
454: { 'z', &z_optname,
455: NUMBER, -1, &swindow, NULL,
456: {
457: "Scroll window size: ",
458: "Scroll window size is %d lines",
459: NULL
460: }
461: },
462: { '"', "e_optname,
463: STRING, 0, NULL, opt_quote,
464: { "quotes: ", NULL, NULL }
465: },
466: { '~', &tilde_optname,
467: BOOL|REPAINT, OPT_ON, &twiddle, NULL,
468: {
469: "Don't show tildes after end of file",
470: "Show tildes after end of file",
471: NULL
472: }
473: },
474: { '?', &query_optname,
475: NOVAR, 0, NULL, opt_query,
476: { NULL, NULL, NULL }
477: },
478: { '#', £_optname,
1.10 shadchin 479: STRING, 0, NULL, opt_shift,
1.6 millert 480: {
481: "Horizontal shift: ",
1.10 shadchin 482: "0123456789.",
1.6 millert 483: NULL
484: }
485: },
1.10 shadchin 486: { OLETTER_NONE, &keypad_optname,
1.6 millert 487: BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
488: {
489: "Use keypad mode",
490: "Don't use keypad mode",
491: NULL
492: }
1.1 etheisen 493: },
1.10 shadchin 494: { OLETTER_NONE, &oldbot_optname,
495: BOOL, OPT_OFF, &oldbot, NULL,
496: {
497: "Use new bottom of screen behavior",
498: "Use old bottom of screen behavior",
499: NULL
500: }
501: },
502: { OLETTER_NONE, &follow_optname,
503: BOOL, FOLLOW_DESC, &follow_mode, NULL,
504: {
505: "F command follows file descriptor",
506: "F command follows file name",
1.12 shadchin 507: NULL
508: }
509: },
510: { OLETTER_NONE, &use_backslash_optname,
511: BOOL, OPT_OFF, &opt_use_backslash, NULL,
512: {
513: "Use backslash escaping in command line parameters",
514: "Don't use backslash escaping in command line parameters",
1.10 shadchin 515: NULL
516: }
517: },
1.6 millert 518: { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
1.1 etheisen 519: };
520:
521:
522: /*
523: * Initialize each option to its default value.
524: */
525: public void
526: init_option()
527: {
1.6 millert 528: register struct loption *o;
1.10 shadchin 529: char *p;
530:
531: p = lgetenv("LESS_IS_MORE");
532: if (p != NULL && *p != '\0')
533: less_is_more = 1;
1.1 etheisen 534:
535: for (o = option; o->oletter != '\0'; o++)
536: {
1.6 millert 537: /*
1.1 etheisen 538: * Set each variable to its default.
539: */
540: if (o->ovar != NULL)
541: *(o->ovar) = o->odefault;
1.6 millert 542: if (o->otype & INIT_HANDLER)
543: (*(o->ofunc))(INIT, (char *) NULL);
1.1 etheisen 544: }
545: }
546:
547: /*
1.6 millert 548: * Find an option in the option table, given its option letter.
1.1 etheisen 549: */
1.6 millert 550: public struct loption *
1.1 etheisen 551: findopt(c)
552: int c;
553: {
1.6 millert 554: register struct loption *o;
1.1 etheisen 555:
556: for (o = option; o->oletter != '\0'; o++)
557: {
558: if (o->oletter == c)
559: return (o);
1.10 shadchin 560: if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c)
1.1 etheisen 561: return (o);
562: }
563: return (NULL);
1.6 millert 564: }
565:
566: /*
567: *
568: */
569: static int
570: is_optchar(c)
571: char c;
572: {
1.10 shadchin 573: if (ASCII_IS_UPPER(c))
1.6 millert 574: return 1;
1.10 shadchin 575: if (ASCII_IS_LOWER(c))
1.6 millert 576: return 1;
577: if (c == '-')
578: return 1;
579: return 0;
580: }
581:
1.8 millert 582: #if GNU_OPTIONS
1.6 millert 583: /*
584: * Find an option in the option table, given its option name.
585: * p_optname is the (possibly partial) name to look for, and
586: * is updated to point after the matched name.
587: * p_oname if non-NULL is set to point to the full option name.
588: */
589: public struct loption *
590: findopt_name(p_optname, p_oname, p_err)
591: char **p_optname;
592: char **p_oname;
593: int *p_err;
594: {
595: char *optname = *p_optname;
596: register struct loption *o;
597: register struct optname *oname;
598: register int len;
599: int uppercase;
600: struct loption *maxo = NULL;
601: struct optname *maxoname = NULL;
602: int maxlen = 0;
603: int ambig = 0;
604: int exact = 0;
605:
606: /*
607: * Check all options.
608: */
609: for (o = option; o->oletter != '\0'; o++)
610: {
611: /*
612: * Check all names for this option.
613: */
614: for (oname = o->onames; oname != NULL; oname = oname->onext)
615: {
616: /*
617: * Try normal match first (uppercase == 0),
618: * then, then if it's a TRIPLE option,
619: * try uppercase match (uppercase == 1).
620: */
621: for (uppercase = 0; uppercase <= 1; uppercase++)
622: {
623: len = sprefix(optname, oname->oname, uppercase);
624: if (len <= 0 || is_optchar(optname[len]))
625: {
626: /*
627: * We didn't use all of the option name.
628: */
629: continue;
630: }
631: if (!exact && len == maxlen)
632: /*
633: * Already had a partial match,
634: * and now there's another one that
635: * matches the same length.
636: */
637: ambig = 1;
638: else if (len > maxlen)
639: {
640: /*
641: * Found a better match than
642: * the one we had.
643: */
644: maxo = o;
645: maxoname = oname;
646: maxlen = len;
647: ambig = 0;
648: exact = (len == (int)strlen(oname->oname));
649: }
650: if (!(o->otype & TRIPLE))
651: break;
652: }
653: }
654: }
655: if (ambig)
656: {
657: /*
658: * Name matched more than one option.
659: */
660: if (p_err != NULL)
661: *p_err = OPT_AMBIG;
662: return (NULL);
663: }
664: *p_optname = optname + maxlen;
665: if (p_oname != NULL)
666: *p_oname = maxoname == NULL ? NULL : maxoname->oname;
667: return (maxo);
1.1 etheisen 668: }
1.8 millert 669: #endif
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