1/*
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2 * Copyright (C) 1984-2009 Mark Nudelman
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| 2 * Copyright (C) 1984-2011 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 * Process command line options.
14 *
15 * Each option is a single letter which controls a program variable.
16 * The options have defaults which may be changed via
17 * the command line option, toggled via the "-" command,
18 * or queried via the "_" command.
19 */
20
21#include "less.h"
22#include "option.h"
23
24static struct loption *pendopt;
25public int plusoption = FALSE;
26
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27static char *propt();
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27static char *optstring();
28static int flip_triple();
29
30extern int screen_trashed;
31extern int less_is_more;
32extern int quit_at_eof;
33extern char *every_first_cmd;
34
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35/*
36 * Return a printable description of an option.
37 */
38 static char *
39opt_desc(o)
40 struct loption *o;
41{
42 static char buf[OPTNAME_MAX + 10];
43 if (o->oletter == OLETTER_NONE)
44 SNPRINTF1(buf, sizeof(buf), "--%s", o->onames->oname);
45 else
46 SNPRINTF2(buf, sizeof(buf), "-%c (--%s)", o->oletter, o->onames->oname);
47 return (buf);
48}
49
50/*
51 * Return a string suitable for printing as the "name" of an option.
52 * For example, if the option letter is 'x', just return "-x".
53 */
54 public char *
55propt(c)
56 int c;
57{
58 static char buf[8];
59
60 sprintf(buf, "-%s", prchar(c));
61 return (buf);
62}
63 |
64/*
65 * Scan an argument (either from the command line or from the
66 * LESS environment variable) and process it.
67 */
68 public void
69scan_option(s)
70 char *s;
71{
72 register struct loption *o;
73 register int optc;
74 char *optname;
75 char *printopt;
76 char *str;
77 int set_default;
78 int lc;
79 int err;
80 PARG parg;
81
82 if (s == NULL)
83 return;
84
85 /*
86 * If we have a pending option which requires an argument,
87 * handle it now.
88 * This happens if the previous option was, for example, "-P"
89 * without a following string. In that case, the current
90 * option is simply the argument for the previous option.
91 */
92 if (pendopt != NULL)
93 {
94 switch (pendopt->otype & OTYPE)
95 {
96 case STRING:
97 (*pendopt->ofunc)(INIT, s);
98 break;
99 case NUMBER:
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72 printopt = propt(pendopt->oletter);
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| 100 printopt = opt_desc(pendopt); |
101 *(pendopt->ovar) = getnum(&s, printopt, (int*)NULL);
102 break;
103 }
104 pendopt = NULL;
105 return;
106 }
107
108 set_default = FALSE;
109 optname = NULL;
110
111 while (*s != '\0')
112 {
113 /*
114 * Check some special cases first.
115 */
116 switch (optc = *s++)
117 {
118 case ' ':
119 case '\t':
120 case END_OPTION_STRING:
121 continue;
122 case '-':
123 /*
124 * "--" indicates an option name instead of a letter.
125 */
126 if (*s == '-')
127 {
128 optname = ++s;
129 break;
130 }
131 /*
132 * "-+" means set these options back to their defaults.
133 * (They may have been set otherwise by previous
134 * options.)
135 */
136 set_default = (*s == '+');
137 if (set_default)
138 s++;
139 continue;
140 case '+':
141 /*
142 * An option prefixed by a "+" is ungotten, so
143 * that it is interpreted as less commands
144 * processed at the start of the first input file.
145 * "++" means process the commands at the start of
146 * EVERY input file.
147 */
148 plusoption = TRUE;
149 s = optstring(s, &str, propt('+'), NULL);
150 if (*str == '+')
151 every_first_cmd = save(++str);
152 else
153 ungetsc(str);
154 continue;
155 case '0': case '1': case '2': case '3': case '4':
156 case '5': case '6': case '7': case '8': case '9':
157 /*
158 * Special "more" compatibility form "-<number>"
159 * instead of -z<number> to set the scrolling
160 * window size.
161 */
162 s--;
163 optc = 'z';
164 break;
165 case 'n':
166 if (less_is_more)
167 optc = 'z';
168 break;
169 }
170
171 /*
172 * Not a special case.
173 * Look up the option letter in the option table.
174 */
175 err = 0;
176 if (optname == NULL)
177 {
178 printopt = propt(optc);
179 lc = ASCII_IS_LOWER(optc);
180 o = findopt(optc);
181 } else
182 {
183 printopt = optname;
184 lc = ASCII_IS_LOWER(optname[0]);
185 o = findopt_name(&optname, NULL, &err);
186 s = optname;
187 optname = NULL;
188 if (*s == '\0' || *s == ' ')
189 {
190 /*
191 * The option name matches exactly.
192 */
193 ;
194 } else if (*s == '=')
195 {
196 /*
197 * The option name is followed by "=value".
198 */
199 if (o != NULL &&
200 (o->otype & OTYPE) != STRING &&
201 (o->otype & OTYPE) != NUMBER)
202 {
203 parg.p_string = printopt;
204 error("The %s option should not be followed by =",
205 &parg);
206 quit(QUIT_ERROR);
207 }
208 s++;
209 } else
210 {
211 /*
212 * The specified name is longer than the
213 * real option name.
214 */
215 o = NULL;
216 }
217 }
218 if (o == NULL)
219 {
220 parg.p_string = printopt;
221 if (err == OPT_AMBIG)
222 error("%s is an ambiguous abbreviation (\"less --help\" for help)",
223 &parg);
224 else
225 error("There is no %s option (\"less --help\" for help)",
226 &parg);
227 quit(QUIT_ERROR);
228 }
229
230 str = NULL;
231 switch (o->otype & OTYPE)
232 {
233 case BOOL:
234 if (set_default)
235 *(o->ovar) = o->odefault;
236 else
237 *(o->ovar) = ! o->odefault;
238 break;
239 case TRIPLE:
240 if (set_default)
241 *(o->ovar) = o->odefault;
242 else
243 *(o->ovar) = flip_triple(o->odefault, lc);
244 break;
245 case STRING:
246 if (*s == '\0')
247 {
248 /*
249 * Set pendopt and return.
250 * We will get the string next time
251 * scan_option is called.
252 */
253 pendopt = o;
254 return;
255 }
256 /*
257 * Don't do anything here.
258 * All processing of STRING options is done by
259 * the handling function.
260 */
261 while (*s == ' ')
262 s++;
263 s = optstring(s, &str, printopt, o->odesc[1]);
264 break;
265 case NUMBER:
266 if (*s == '\0')
267 {
268 pendopt = o;
269 return;
270 }
271 *(o->ovar) = getnum(&s, printopt, (int*)NULL);
272 break;
273 }
274 /*
275 * If the option has a handling function, call it.
276 */
277 if (o->ofunc != NULL)
278 (*o->ofunc)(INIT, str);
279 }
280}
281
282/*
283 * Toggle command line flags from within the program.
284 * Used by the "-" and "_" commands.
285 * how_toggle may be:
286 * OPT_NO_TOGGLE just report the current setting, without changing it.
287 * OPT_TOGGLE invert the current setting
288 * OPT_UNSET set to the default value
289 * OPT_SET set to the inverse of the default value
290 */
291 public void
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264toggle_option(c, s, how_toggle)
265 int c;
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292toggle_option(o, lower, s, how_toggle)
293 struct loption *o;
294 int lower; |
295 char *s;
296 int how_toggle;
297{
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269 register struct loption *o;
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298 register int num;
299 int no_prompt;
300 int err;
301 PARG parg;
302
303 no_prompt = (how_toggle & OPT_NO_PROMPT);
304 how_toggle &= ~OPT_NO_PROMPT;
305
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278 /*
279 * Look up the option letter in the option table.
280 */
281 o = findopt(c);
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306 if (o == NULL)
307 {
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284 parg.p_string = propt(c);
285 error("There is no %s option", &parg);
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| 308 error("No such option", NULL_PARG); |
309 return;
310 }
311
312 if (how_toggle == OPT_TOGGLE && (o->otype & NO_TOGGLE))
313 {
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291 parg.p_string = propt(c);
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| 314 parg.p_string = opt_desc(o); |
315 error("Cannot change the %s option", &parg);
316 return;
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294 }
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| 317 } |
318
319 if (how_toggle == OPT_NO_TOGGLE && (o->otype & NO_QUERY))
320 {
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298 parg.p_string = propt(c);
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| 321 parg.p_string = opt_desc(o); |
322 error("Cannot query the %s option", &parg);
323 return;
324 }
325
326 /*
327 * Check for something which appears to be a do_toggle
328 * (because the "-" command was used), but really is not.
329 * This could be a string option with no string, or
330 * a number option with no number.
331 */
332 switch (o->otype & OTYPE)
333 {
334 case STRING:
335 case NUMBER:
336 if (how_toggle == OPT_TOGGLE && *s == '\0')
337 how_toggle = OPT_NO_TOGGLE;
338 break;
339 }
340
341#if HILITE_SEARCH
342 if (how_toggle != OPT_NO_TOGGLE && (o->otype & HL_REPAINT))
343 repaint_hilite(0);
344#endif
345
346 /*
347 * Now actually toggle (change) the variable.
348 */
349 if (how_toggle != OPT_NO_TOGGLE)
350 {
351 switch (o->otype & OTYPE)
352 {
353 case BOOL:
354 /*
355 * Boolean.
356 */
357 switch (how_toggle)
358 {
359 case OPT_TOGGLE:
360 *(o->ovar) = ! *(o->ovar);
361 break;
362 case OPT_UNSET:
363 *(o->ovar) = o->odefault;
364 break;
365 case OPT_SET:
366 *(o->ovar) = ! o->odefault;
367 break;
368 }
369 break;
370 case TRIPLE:
371 /*
372 * Triple:
373 * If user gave the lower case letter, then switch
374 * to 1 unless already 1, in which case make it 0.
375 * If user gave the upper case letter, then switch
376 * to 2 unless already 2, in which case make it 0.
377 */
378 switch (how_toggle)
379 {
380 case OPT_TOGGLE:
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358 *(o->ovar) = flip_triple(*(o->ovar),
359 ASCII_IS_LOWER(c));
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| 381 *(o->ovar) = flip_triple(*(o->ovar), lower); |
382 break;
383 case OPT_UNSET:
384 *(o->ovar) = o->odefault;
385 break;
386 case OPT_SET:
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365 *(o->ovar) = flip_triple(o->odefault,
366 ASCII_IS_LOWER(c));
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| 387 *(o->ovar) = flip_triple(o->odefault, lower); |
388 break;
389 }
390 break;
391 case STRING:
392 /*
393 * String: don't do anything here.
394 * The handling function will do everything.
395 */
396 switch (how_toggle)
397 {
398 case OPT_SET:
399 case OPT_UNSET:
400 error("Cannot use \"-+\" or \"--\" for a string option",
401 NULL_PARG);
402 return;
403 }
404 break;
405 case NUMBER:
406 /*
407 * Number: set the variable to the given number.
408 */
409 switch (how_toggle)
410 {
411 case OPT_TOGGLE:
412 num = getnum(&s, NULL, &err);
413 if (!err)
414 *(o->ovar) = num;
415 break;
416 case OPT_UNSET:
417 *(o->ovar) = o->odefault;
418 break;
419 case OPT_SET:
420 error("Can't use \"-!\" for a numeric option",
421 NULL_PARG);
422 return;
423 }
424 break;
425 }
426 }
427
428 /*
429 * Call the handling function for any special action
430 * specific to this option.
431 */
432 if (o->ofunc != NULL)
433 (*o->ofunc)((how_toggle==OPT_NO_TOGGLE) ? QUERY : TOGGLE, s);
434
435#if HILITE_SEARCH
436 if (how_toggle != OPT_NO_TOGGLE && (o->otype & HL_REPAINT))
437 chg_hilite();
438#endif
439
440 if (!no_prompt)
441 {
442 /*
443 * Print a message describing the new setting.
444 */
445 switch (o->otype & OTYPE)
446 {
447 case BOOL:
448 case TRIPLE:
449 /*
450 * Print the odesc message.
451 */
452 error(o->odesc[*(o->ovar)], NULL_PARG);
453 break;
454 case NUMBER:
455 /*
456 * The message is in odesc[1] and has a %d for
457 * the value of the variable.
458 */
459 parg.p_int = *(o->ovar);
460 error(o->odesc[1], &parg);
461 break;
462 case STRING:
463 /*
464 * Message was already printed by the handling function.
465 */
466 break;
467 }
468 }
469
470 if (how_toggle != OPT_NO_TOGGLE && (o->otype & REPAINT))
471 screen_trashed = TRUE;
472}
473
474/*
475 * "Toggle" a triple-valued option.
476 */
477 static int
478flip_triple(val, lc)
479 int val;
480 int lc;
481{
482 if (lc)
483 return ((val == OPT_ON) ? OPT_OFF : OPT_ON);
484 else
485 return ((val == OPT_ONPLUS) ? OPT_OFF : OPT_ONPLUS);
486}
487
488/*
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468 * Return a string suitable for printing as the "name" of an option.
469 * For example, if the option letter is 'x', just return "-x".
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| 489 * Determine if an option takes a parameter. |
490 */
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471 static char *
472propt(c)
473 int c;
474{
475 static char buf[8];
476
477 sprintf(buf, "-%s", prchar(c));
478 return (buf);
479}
480
481/*
482 * Determine if an option is a single character option (BOOL or TRIPLE),
483 * or if it a multi-character option (NUMBER).
484 */
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491 public int
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486single_char_option(c)
487 int c;
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492opt_has_param(o)
493 struct loption *o; |
494{
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489 register struct loption *o;
490
491 o = findopt(c);
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495 if (o == NULL)
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493 return (TRUE);
494 return ((o->otype & (BOOL|TRIPLE|NOVAR|NO_TOGGLE)) != 0);
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496 return (0);
497 if (o->otype & (BOOL|TRIPLE|NOVAR|NO_TOGGLE))
498 return (0);
499 return (1); |
500}
501
502/*
503 * Return the prompt to be used for a given option letter.
504 * Only string and number valued options have prompts.
505 */
506 public char *
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502opt_prompt(c)
503 int c;
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507opt_prompt(o)
508 struct loption *o; |
509{
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505 register struct loption *o;
506
507 o = findopt(c);
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510 if (o == NULL || (o->otype & (STRING|NUMBER)) == 0)
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509 return (NULL);
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| 511 return ("?"); |
512 return (o->odesc[0]);
513}
514
515/*
516 * Return whether or not there is a string option pending;
517 * that is, if the previous option was a string-valued option letter
518 * (like -P) without a following string.
519 * In that case, the current option is taken to be the string for
520 * the previous option.
521 */
522 public int
523isoptpending()
524{
525 return (pendopt != NULL);
526}
527
528/*
529 * Print error message about missing string.
530 */
531 static void
532nostring(printopt)
533 char *printopt;
534{
535 PARG parg;
536 parg.p_string = printopt;
537 error("Value is required after %s", &parg);
538}
539
540/*
541 * Print error message if a STRING type option is not followed by a string.
542 */
543 public void
544nopendopt()
545{
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544 nostring(propt(pendopt->oletter));
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| 546 nostring(opt_desc(pendopt)); |
547}
548
549/*
550 * Scan to end of string or to an END_OPTION_STRING character.
551 * In the latter case, replace the char with a null char.
552 * Return a pointer to the remainder of the string, if any.
553 */
554 static char *
555optstring(s, p_str, printopt, validchars)
556 char *s;
557 char **p_str;
558 char *printopt;
559 char *validchars;
560{
561 register char *p;
562
563 if (*s == '\0')
564 {
565 nostring(printopt);
566 quit(QUIT_ERROR);
567 }
568 *p_str = s;
569 for (p = s; *p != '\0'; p++)
570 {
571 if (*p == END_OPTION_STRING ||
572 (validchars != NULL && strchr(validchars, *p) == NULL))
573 {
574 switch (*p)
575 {
576 case END_OPTION_STRING:
577 case ' ': case '\t': case '-':
578 /* Replace the char with a null to terminate string. */
579 *p++ = '\0';
580 break;
581 default:
582 /* Cannot replace char; make a copy of the string. */
583 *p_str = (char *) ecalloc(p-s+1, sizeof(char));
584 strncpy(*p_str, s, p-s);
585 (*p_str)[p-s] = '\0';
586 break;
587 }
588 break;
589 }
590 }
591 return (p);
592}
593
594/*
595 */
596 static int
597num_error(printopt, errp)
598 char *printopt;
599 int *errp;
600{
601 PARG parg;
602
603 if (errp != NULL)
604 {
605 *errp = TRUE;
606 return (-1);
607 }
608 if (printopt != NULL)
609 {
610 parg.p_string = printopt;
611 error("Number is required after %s", &parg);
612 }
613 quit(QUIT_ERROR);
614 /* NOTREACHED */
615 return (-1);
616}
617
618/*
619 * Translate a string into a number.
620 * Like atoi(), but takes a pointer to a char *, and updates
621 * the char * to point after the translated number.
622 */
623 public int
624getnum(sp, printopt, errp)
625 char **sp;
626 char *printopt;
627 int *errp;
628{
629 register char *s;
630 register int n;
631 register int neg;
632
633 s = skipsp(*sp);
634 neg = FALSE;
635 if (*s == '-')
636 {
637 neg = TRUE;
638 s++;
639 }
640 if (*s < '0' || *s > '9')
641 return (num_error(printopt, errp));
642
643 n = 0;
644 while (*s >= '0' && *s <= '9')
645 n = 10 * n + *s++ - '0';
646 *sp = s;
647 if (errp != NULL)
648 *errp = FALSE;
649 if (neg)
650 n = -n;
651 return (n);
652}
653
654/*
655 * Translate a string into a fraction, represented by the part of a
656 * number which would follow a decimal point.
657 * The value of the fraction is returned as parts per NUM_FRAC_DENOM.
658 * That is, if "n" is returned, the fraction intended is n/NUM_FRAC_DENOM.
659 */
660 public long
661getfraction(sp, printopt, errp)
662 char **sp;
663 char *printopt;
664 int *errp;
665{
666 register char *s;
667 long frac = 0;
668 int fraclen = 0;
669
670 s = skipsp(*sp);
671 if (*s < '0' || *s > '9')
672 return (num_error(printopt, errp));
673
674 for ( ; *s >= '0' && *s <= '9'; s++)
675 {
676 frac = (frac * 10) + (*s - '0');
677 fraclen++;
678 }
679 if (fraclen > NUM_LOG_FRAC_DENOM)
680 while (fraclen-- > NUM_LOG_FRAC_DENOM)
681 frac /= 10;
682 else
683 while (fraclen++ < NUM_LOG_FRAC_DENOM)
684 frac *= 10;
685 *sp = s;
686 if (errp != NULL)
687 *errp = FALSE;
688 return (frac);
689}
690
691
692/*
693 * Get the value of the -e flag.
694 */
695 public int
696get_quit_at_eof()
697{
698 if (!less_is_more)
699 return quit_at_eof;
700 /* When less_is_more is set, the -e flag semantics are different. */
701 return quit_at_eof ? OPT_ON : OPT_ONPLUS;
702}
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