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Switch LINT to building NATA.
[dragonfly/vkernel-mp.git] / contrib / less-403 / command.c
blobda0f3ead67477c5488fca770e54b734a807f781e
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 * User-level command processor.
14 */
15
16 #include "less.h"
17 #if MSDOS_COMPILER==WIN32C
18 #include <windows.h>
19 #endif
20 #include "position.h"
21 #include "option.h"
22 #include "cmd.h"
23
24 extern int erase_char, erase2_char, kill_char;
25 extern int sigs;
26 extern int quit_if_one_screen;
27 extern int squished;
28 extern int hit_eof;
29 extern int sc_width;
30 extern int sc_height;
31 extern int swindow;
32 extern int jump_sline;
33 extern int quitting;
34 extern int wscroll;
35 extern int top_scroll;
36 extern int ignore_eoi;
37 extern int secure;
38 extern int hshift;
39 extern int show_attn;
40 extern char *every_first_cmd;
41 extern char *curr_altfilename;
42 extern char version[];
43 extern struct scrpos initial_scrpos;
44 extern IFILE curr_ifile;
45 extern void constant *ml_search;
46 extern void constant *ml_examine;
47 #if SHELL_ESCAPE || PIPEC
48 extern void constant *ml_shell;
49 #endif
50 #if EDITOR
51 extern char *editor;
52 extern char *editproto;
53 #endif
54 extern int screen_trashed; /* The screen has been overwritten */
55 extern int shift_count;
56 extern int oldbot;
57 extern int forw_prompt;
58
59 static char ungot[UNGOT_SIZE];
60 static char *ungotp = NULL;
61 #if SHELL_ESCAPE
62 static char *shellcmd = NULL; /* For holding last shell command for "!!" */
63 #endif
64 static int mca; /* The multicharacter command (action) */
65 static int search_type; /* The previous type of search */
66 static LINENUM number; /* The number typed by the user */
67 static long fraction; /* The fractional part of the number */
68 static char optchar;
69 static int optflag;
70 static int optgetname;
71 static POSITION bottompos;
72 static int save_hshift;
73 #if PIPEC
74 static char pipec;
75 #endif
76
77 static void multi_search();
78
79 /*
80 * Move the cursor to start of prompt line before executing a command.
81 * This looks nicer if the command takes a long time before
82 * updating the screen.
83 */
84 static void
85 cmd_exec()
86 {
87 clear_attn();
88 line_left();
89 flush();
90 }
91
92 /*
93 * Set up the display to start a new multi-character command.
94 */
95 static void
96 start_mca(action, prompt, mlist, cmdflags)
97 int action;
98 char *prompt;
99 void *mlist;
100 int cmdflags;
101 {
102 mca = action;
103 clear_bot();
104 clear_cmd();
105 cmd_putstr(prompt);
106 set_mlist(mlist, cmdflags);
107 }
108
109 public int
110 in_mca()
111 {
112 return (mca != 0 && mca != A_PREFIX);
113 }
114
115 /*
116 * Set up the display to start a new search command.
117 */
118 static void
119 mca_search()
120 {
121 if (search_type & SRCH_FORW)
122 mca = A_F_SEARCH;
123 else
124 mca = A_B_SEARCH;
125
126 clear_bot();
127 clear_cmd();
128
129 if (search_type & SRCH_NO_MATCH)
130 cmd_putstr("Non-match ");
131 if (search_type & SRCH_FIRST_FILE)
132 cmd_putstr("First-file ");
133 if (search_type & SRCH_PAST_EOF)
134 cmd_putstr("EOF-ignore ");
135 if (search_type & SRCH_NO_MOVE)
136 cmd_putstr("Keep-pos ");
137 if (search_type & SRCH_NO_REGEX)
138 cmd_putstr("Regex-off ");
139
140 if (search_type & SRCH_FORW)
141 cmd_putstr("/");
142 else
143 cmd_putstr("?");
144 set_mlist(ml_search, 0);
145 }
146
147 /*
148 * Set up the display to start a new toggle-option command.
149 */
150 static void
151 mca_opt_toggle()
152 {
153 int no_prompt;
154 int flag;
155 char *dash;
156
157 no_prompt = (optflag & OPT_NO_PROMPT);
158 flag = (optflag & ~OPT_NO_PROMPT);
159 dash = (flag == OPT_NO_TOGGLE) ? "_" : "-";
160
161 mca = A_OPT_TOGGLE;
162 clear_bot();
163 clear_cmd();
164 cmd_putstr(dash);
165 if (optgetname)
166 cmd_putstr(dash);
167 if (no_prompt)
168 cmd_putstr("(P)");
169 switch (flag)
170 {
171 case OPT_UNSET:
172 cmd_putstr("+");
173 break;
174 case OPT_SET:
175 cmd_putstr("!");
176 break;
177 }
178 set_mlist(NULL, 0);
179 }
180
181 /*
182 * Execute a multicharacter command.
183 */
184 static void
185 exec_mca()
186 {
187 register char *cbuf;
188
189 cmd_exec();
190 cbuf = get_cmdbuf();
191
192 switch (mca)
193 {
194 case A_F_SEARCH:
195 case A_B_SEARCH:
196 multi_search(cbuf, (int) number);
197 break;
198 case A_FIRSTCMD:
199 /*
200 * Skip leading spaces or + signs in the string.
201 */
202 while (*cbuf == '+' || *cbuf == ' ')
203 cbuf++;
204 if (every_first_cmd != NULL)
205 free(every_first_cmd);
206 if (*cbuf == '\0')
207 every_first_cmd = NULL;
208 else
209 every_first_cmd = save(cbuf);
210 break;
211 case A_OPT_TOGGLE:
212 toggle_option(optchar, cbuf, optflag);
213 optchar = '\0';
214 break;
215 case A_F_BRACKET:
216 match_brac(cbuf[0], cbuf[1], 1, (int) number);
217 break;
218 case A_B_BRACKET:
219 match_brac(cbuf[1], cbuf[0], 0, (int) number);
220 break;
221 #if EXAMINE
222 case A_EXAMINE:
223 if (secure)
224 break;
225 edit_list(cbuf);
226 #if TAGS
227 /* If tag structure is loaded then clean it up. */
228 cleantags();
229 #endif
230 break;
231 #endif
232 #if SHELL_ESCAPE
233 case A_SHELL:
234 /*
235 * !! just uses whatever is in shellcmd.
236 * Otherwise, copy cmdbuf to shellcmd,
237 * expanding any special characters ("%" or "#").
238 */
239 if (*cbuf != '!')
240 {
241 if (shellcmd != NULL)
242 free(shellcmd);
243 shellcmd = fexpand(cbuf);
244 }
245
246 if (secure)
247 break;
248 if (shellcmd == NULL)
249 lsystem("", "!done");
250 else
251 lsystem(shellcmd, "!done");
252 break;
253 #endif
254 #if PIPEC
255 case A_PIPE:
256 if (secure)
257 break;
258 (void) pipe_mark(pipec, cbuf);
259 error("|done", NULL_PARG);
260 break;
261 #endif
262 }
263 }
264
265 /*
266 * Add a character to a multi-character command.
267 */
268 static int
269 mca_char(c)
270 int c;
271 {
272 char *p;
273 int flag;
274 char buf[3];
275 PARG parg;
276
277 switch (mca)
278 {
279 case 0:
280 /*
281 * Not in a multicharacter command.
282 */
283 return (NO_MCA);
284
285 case A_PREFIX:
286 /*
287 * In the prefix of a command.
288 * This not considered a multichar command
289 * (even tho it uses cmdbuf, etc.).
290 * It is handled in the commands() switch.
291 */
292 return (NO_MCA);
293
294 case A_DIGIT:
295 /*
296 * Entering digits of a number.
297 * Terminated by a non-digit.
298 */
299 if (!((c >= '0' && c <= '9') || c == '.') &&
300 editchar(c, EC_PEEK|EC_NOHISTORY|EC_NOCOMPLETE|EC_NORIGHTLEFT) == A_INVALID)
301 {
302 /*
303 * Not part of the number.
304 * Treat as a normal command character.
305 */
306 number = cmd_int(&fraction);
307 mca = 0;
308 cmd_accept();
309 return (NO_MCA);
310 }
311 break;
312
313 case A_OPT_TOGGLE:
314 /*
315 * Special case for the TOGGLE_OPTION command.
316 * If the option letter which was entered is a
317 * single-char option, execute the command immediately,
318 * so user doesn't have to hit RETURN.
319 * If the first char is + or -, this indicates
320 * OPT_UNSET or OPT_SET respectively, instead of OPT_TOGGLE.
321 * "--" begins inputting a long option name.
322 */
323 if (optchar == '\0' && len_cmdbuf() == 0)
324 {
325 flag = (optflag & ~OPT_NO_PROMPT);
326 if (flag == OPT_NO_TOGGLE)
327 {
328 switch (c)
329 {
330 case '_':
331 /* "__" = long option name. */
332 optgetname = TRUE;
333 mca_opt_toggle();
334 return (MCA_MORE);
335 }
336 } else
337 {
338 switch (c)
339 {
340 case '+':
341 /* "-+" = UNSET. */
342 optflag = (flag == OPT_UNSET) ?
343 OPT_TOGGLE : OPT_UNSET;
344 mca_opt_toggle();
345 return (MCA_MORE);
346 case '!':
347 /* "-!" = SET */
348 optflag = (flag == OPT_SET) ?
349 OPT_TOGGLE : OPT_SET;
350 mca_opt_toggle();
351 return (MCA_MORE);
352 case CONTROL('P'):
353 optflag ^= OPT_NO_PROMPT;
354 mca_opt_toggle();
355 return (MCA_MORE);
356 case '-':
357 /* "--" = long option name. */
358 optgetname = TRUE;
359 mca_opt_toggle();
360 return (MCA_MORE);
361 }
362 }
363 }
364 if (optgetname)
365 {
366 /*
367 * We're getting a long option name.
368 * See if we've matched an option name yet.
369 * If so, display the complete name and stop
370 * accepting chars until user hits RETURN.
371 */
372 struct loption *o;
373 char *oname;
374 int lc;
375
376 if (c == '\n' || c == '\r')
377 {
378 /*
379 * When the user hits RETURN, make sure
380 * we've matched an option name, then
381 * pretend he just entered the equivalent
382 * option letter.
383 */
384 if (optchar == '\0')
385 {
386 parg.p_string = get_cmdbuf();
387 error("There is no --%s option", &parg);
388 return (MCA_DONE);
389 }
390 optgetname = FALSE;
391 cmd_reset();
392 c = optchar;
393 } else
394 {
395 if (optchar != '\0')
396 {
397 /*
398 * Already have a match for the name.
399 * Don't accept anything but erase/kill.
400 */
401 if (c == erase_char ||
402 c == erase2_char ||
403 c == kill_char)
404 return (MCA_DONE);
405 return (MCA_MORE);
406 }
407 /*
408 * Add char to cmd buffer and try to match
409 * the option name.
410 */
411 if (cmd_char(c) == CC_QUIT)
412 return (MCA_DONE);
413 p = get_cmdbuf();
414 lc = ASCII_IS_LOWER(p[0]);
415 o = findopt_name(&p, &oname, NULL);
416 if (o != NULL)
417 {
418 /*
419 * Got a match.
420 * Remember the option letter and
421 * display the full option name.
422 */
423 optchar = o->oletter;
424 if (!lc && ASCII_IS_LOWER(optchar))
425 optchar = ASCII_TO_UPPER(optchar);
426 cmd_reset();
427 mca_opt_toggle();
428 for (p = oname; *p != '\0'; p++)
429 {
430 c = *p;
431 if (!lc && ASCII_IS_LOWER(c))
432 c = ASCII_TO_UPPER(c);
433 if (cmd_char(c) != CC_OK)
434 return (MCA_DONE);
435 }
436 }
437 return (MCA_MORE);
438 }
439 } else
440 {
441 if (c == erase_char || c == erase2_char || c == kill_char)
442 break;
443 if (optchar != '\0')
444 /* We already have the option letter. */
445 break;
446 }
447
448 optchar = c;
449 if ((optflag & ~OPT_NO_PROMPT) != OPT_TOGGLE ||
450 single_char_option(c))
451 {
452 toggle_option(c, "", optflag);
453 return (MCA_DONE);
454 }
455 /*
456 * Display a prompt appropriate for the option letter.
457 */
458 if ((p = opt_prompt(c)) == NULL)
459 {
460 buf[0] = '-';
461 buf[1] = c;
462 buf[2] = '\0';
463 p = buf;
464 }
465 start_mca(A_OPT_TOGGLE, p, (void*)NULL, 0);
466 return (MCA_MORE);
467
468 case A_F_SEARCH:
469 case A_B_SEARCH:
470 /*
471 * Special case for search commands.
472 * Certain characters as the first char of
473 * the pattern have special meaning:
474 * ! Toggle the NO_MATCH flag
475 * * Toggle the PAST_EOF flag
476 * @ Toggle the FIRST_FILE flag
477 */
478 if (len_cmdbuf() > 0)
479 /*
480 * Only works for the first char of the pattern.
481 */
482 break;
483
484 flag = 0;
485 switch (c)
486 {
487 case CONTROL('E'): /* ignore END of file */
488 case '*':
489 flag = SRCH_PAST_EOF;
490 break;
491 case CONTROL('F'): /* FIRST file */
492 case '@':
493 flag = SRCH_FIRST_FILE;
494 break;
495 case CONTROL('K'): /* KEEP position */
496 flag = SRCH_NO_MOVE;
497 break;
498 case CONTROL('R'): /* Don't use REGULAR EXPRESSIONS */
499 flag = SRCH_NO_REGEX;
500 break;
501 case CONTROL('N'): /* NOT match */
502 case '!':
503 flag = SRCH_NO_MATCH;
504 break;
505 }
506 if (flag != 0)
507 {
508 search_type ^= flag;
509 mca_search();
510 return (MCA_MORE);
511 }
512 break;
513 }
514
515 /*
516 * Any other multicharacter command
517 * is terminated by a newline.
518 */
519 if (c == '\n' || c == '\r')
520 {
521 /*
522 * Execute the command.
523 */
524 exec_mca();
525 return (MCA_DONE);
526 }
527
528 /*
529 * Append the char to the command buffer.
530 */
531 if (cmd_char(c) == CC_QUIT)
532 /*
533 * Abort the multi-char command.
534 */
535 return (MCA_DONE);
536
537 if ((mca == A_F_BRACKET || mca == A_B_BRACKET) && len_cmdbuf() >= 2)
538 {
539 /*
540 * Special case for the bracket-matching commands.
541 * Execute the command after getting exactly two
542 * characters from the user.
543 */
544 exec_mca();
545 return (MCA_DONE);
546 }
547
548 /*
549 * Need another character.
550 */
551 return (MCA_MORE);
552 }
553
554 /*
555 * Make sure the screen is displayed.
556 */
557 static void
558 make_display()
559 {
560 /*
561 * If nothing is displayed yet, display starting from initial_scrpos.
562 */
563 if (empty_screen())
564 {
565 if (initial_scrpos.pos == NULL_POSITION)
566 /*
567 * {{ Maybe this should be:
568 * jump_loc(ch_zero(), jump_sline);
569 * but this behavior seems rather unexpected
570 * on the first screen. }}
571 */
572 jump_loc(ch_zero(), 1);
573 else
574 jump_loc(initial_scrpos.pos, initial_scrpos.ln);
575 } else if (screen_trashed)
576 {
577 int save_top_scroll;
578 save_top_scroll = top_scroll;
579 top_scroll = 1;
580 repaint();
581 top_scroll = save_top_scroll;
582 }
583 }
584
585 /*
586 * Display the appropriate prompt.
587 */
588 static void
589 prompt()
590 {
591 register char *p;
592
593 if (ungotp != NULL && ungotp > ungot)
594 {
595 /*
596 * No prompt necessary if commands are from
597 * ungotten chars rather than from the user.
598 */
599 return;
600 }
601
602 /*
603 * Make sure the screen is displayed.
604 */
605 make_display();
606 bottompos = position(BOTTOM_PLUS_ONE);
607
608 /*
609 * If we've hit EOF on the last file, and the -E flag is set
610 * (or -F is set and this is the first prompt), then quit.
611 * {{ Relying on "first prompt" to detect a single-screen file
612 * fails if +G is used, for example. }}
613 */
614 if ((get_quit_at_eof() == OPT_ONPLUS || quit_if_one_screen) &&
615 hit_eof && !(ch_getflags() & CH_HELPFILE) &&
616 next_ifile(curr_ifile) == NULL_IFILE)
617 quit(QUIT_OK);
618 quit_if_one_screen = FALSE;
619 #if 0 /* This doesn't work well because some "te"s clear the screen. */
620 /*
621 * If the -e flag is set and we've hit EOF on the last file,
622 * and the file is squished (shorter than the screen), quit.
623 */
624 if (get_quit_at_eof() && squished &&
625 next_ifile(curr_ifile) == NULL_IFILE)
626 quit(QUIT_OK);
627 #endif
628
629 #if MSDOS_COMPILER==WIN32C
630 /*
631 * In Win32, display the file name in the window title.
632 */
633 if (!(ch_getflags() & CH_HELPFILE))
634 SetConsoleTitle(pr_expand("Less?f - %f.", 0));
635 #endif
636 /*
637 * Select the proper prompt and display it.
638 */
639 /*
640 * If the previous action was a forward movement,
641 * don't clear the bottom line of the display;
642 * just print the prompt since the forward movement guarantees
643 * that we're in the right position to display the prompt.
644 * Clearing the line could cause a problem: for example, if the last
645 * line displayed ended at the right screen edge without a newline,
646 * then clearing would clear the last displayed line rather than
647 * the prompt line.
648 */
649 if (!forw_prompt)
650 clear_bot();
651 clear_cmd();
652 forw_prompt = 0;
653 p = pr_string();
654 if (p == NULL || *p == '\0')
655 putchr(':');
656 else
657 {
658 at_enter(AT_STANDOUT);
659 putstr(p);
660 at_exit();
661 }
662 clear_eol();
663 }
664
665 /*
666 * Display the less version message.
667 */
668 public void
669 dispversion()
670 {
671 PARG parg;
672
673 parg.p_string = version;
674 error("less %s", &parg);
675 }
676
677 /*
678 * Get command character.
679 * The character normally comes from the keyboard,
680 * but may come from ungotten characters
681 * (characters previously given to ungetcc or ungetsc).
682 */
683 public int
684 getcc()
685 {
686 if (ungotp == NULL)
687 /*
688 * Normal case: no ungotten chars, so get one from the user.
689 */
690 return (getchr());
691
692 if (ungotp > ungot)
693 /*
694 * Return the next ungotten char.
695 */
696 return (*--ungotp);
697
698 /*
699 * We have just run out of ungotten chars.
700 */
701 ungotp = NULL;
702 if (len_cmdbuf() == 0 || !empty_screen())
703 return (getchr());
704 /*
705 * Command is incomplete, so try to complete it.
706 */
707 switch (mca)
708 {
709 case A_DIGIT:
710 /*
711 * We have a number but no command. Treat as #g.
712 */
713 return ('g');
714
715 case A_F_SEARCH:
716 case A_B_SEARCH:
717 /*
718 * We have "/string" but no newline. Add the \n.
719 */
720 return ('\n');
721
722 default:
723 /*
724 * Some other incomplete command. Let user complete it.
725 */
726 return (getchr());
727 }
728 }
729
730 /*
731 * "Unget" a command character.
732 * The next getcc() will return this character.
733 */
734 public void
735 ungetcc(c)
736 int c;
737 {
738 if (ungotp == NULL)
739 ungotp = ungot;
740 if (ungotp >= ungot + sizeof(ungot))
741 {
742 error("ungetcc overflow", NULL_PARG);
743 quit(QUIT_ERROR);
744 }
745 *ungotp++ = c;
746 }
747
748 /*
749 * Unget a whole string of command characters.
750 * The next sequence of getcc()'s will return this string.
751 */
752 public void
753 ungetsc(s)
754 char *s;
755 {
756 register char *p;
757
758 for (p = s + strlen(s) - 1; p >= s; p--)
759 ungetcc(*p);
760 }
761
762 /*
763 * Search for a pattern, possibly in multiple files.
764 * If SRCH_FIRST_FILE is set, begin searching at the first file.
765 * If SRCH_PAST_EOF is set, continue the search thru multiple files.
766 */
767 static void
768 multi_search(pattern, n)
769 char *pattern;
770 int n;
771 {
772 register int nomore;
773 IFILE save_ifile;
774 int changed_file;
775
776 changed_file = 0;
777 save_ifile = save_curr_ifile();
778
779 if (search_type & SRCH_FIRST_FILE)
780 {
781 /*
782 * Start at the first (or last) file
783 * in the command line list.
784 */
785 if (search_type & SRCH_FORW)
786 nomore = edit_first();
787 else
788 nomore = edit_last();
789 if (nomore)
790 {
791 unsave_ifile(save_ifile);
792 return;
793 }
794 changed_file = 1;
795 search_type &= ~SRCH_FIRST_FILE;
796 }
797
798 for (;;)
799 {
800 n = search(search_type, pattern, n);
801 /*
802 * The SRCH_NO_MOVE flag doesn't "stick": it gets cleared
803 * after being used once. This allows "n" to work after
804 * using a /@@ search.
805 */
806 search_type &= ~SRCH_NO_MOVE;
807 if (n == 0)
808 {
809 /*
810 * Found it.
811 */
812 unsave_ifile(save_ifile);
813 return;
814 }
815
816 if (n < 0)
817 /*
818 * Some kind of error in the search.
819 * Error message has been printed by search().
820 */
821 break;
822
823 if ((search_type & SRCH_PAST_EOF) == 0)
824 /*
825 * We didn't find a match, but we're
826 * supposed to search only one file.
827 */
828 break;
829 /*
830 * Move on to the next file.
831 */
832 if (search_type & SRCH_FORW)
833 nomore = edit_next(1);
834 else
835 nomore = edit_prev(1);
836 if (nomore)
837 break;
838 changed_file = 1;
839 }
840
841 /*
842 * Didn't find it.
843 * Print an error message if we haven't already.
844 */
845 if (n > 0)
846 error("Pattern not found", NULL_PARG);
847
848 if (changed_file)
849 {
850 /*
851 * Restore the file we were originally viewing.
852 */
853 reedit_ifile(save_ifile);
854 } else
855 {
856 unsave_ifile(save_ifile);
857 }
858 }
859
860 /*
861 * Main command processor.
862 * Accept and execute commands until a quit command.
863 */
864 public void
865 commands()
866 {
867 register int c;
868 register int action;
869 register char *cbuf;
870 int newaction;
871 int save_search_type;
872 char *extra;
873 char tbuf[2];
874 PARG parg;
875 IFILE old_ifile;
876 IFILE new_ifile;
877 char *tagfile;
878
879 search_type = SRCH_FORW;
880 wscroll = (sc_height + 1) / 2;
881 newaction = A_NOACTION;
882
883 for (;;)
884 {
885 mca = 0;
886 cmd_accept();
887 number = 0;
888 optchar = '\0';
889
890 /*
891 * See if any signals need processing.
892 */
893 if (sigs)
894 {
895 psignals();
896 if (quitting)
897 quit(QUIT_SAVED_STATUS);
898 }
899
900 /*
901 * See if window size changed, for systems that don't
902 * generate SIGWINCH.
903 */
904 check_winch();
905
906 /*
907 * Display prompt and accept a character.
908 */
909 cmd_reset();
910 prompt();
911 if (sigs)
912 continue;
913 if (newaction == A_NOACTION)
914 c = getcc();
915
916 again:
917 if (sigs)
918 continue;
919
920 if (newaction != A_NOACTION)
921 {
922 action = newaction;
923 newaction = A_NOACTION;
924 } else
925 {
926 /*
927 * If we are in a multicharacter command, call mca_char.
928 * Otherwise we call fcmd_decode to determine the
929 * action to be performed.
930 */
931 if (mca)
932 switch (mca_char(c))
933 {
934 case MCA_MORE:
935 /*
936 * Need another character.
937 */
938 c = getcc();
939 goto again;
940 case MCA_DONE:
941 /*
942 * Command has been handled by mca_char.
943 * Start clean with a prompt.
944 */
945 continue;
946 case NO_MCA:
947 /*
948 * Not a multi-char command
949 * (at least, not anymore).
950 */
951 break;
952 }
953
954 /*
955 * Decode the command character and decide what to do.
956 */
957 if (mca)
958 {
959 /*
960 * We're in a multichar command.
961 * Add the character to the command buffer
962 * and display it on the screen.
963 * If the user backspaces past the start
964 * of the line, abort the command.
965 */
966 if (cmd_char(c) == CC_QUIT || len_cmdbuf() == 0)
967 continue;
968 cbuf = get_cmdbuf();
969 } else
970 {
971 /*
972 * Don't use cmd_char if we're starting fresh
973 * at the beginning of a command, because we
974 * don't want to echo the command until we know
975 * it is a multichar command. We also don't
976 * want erase_char/kill_char to be treated
977 * as line editing characters.
978 */
979 tbuf[0] = c;
980 tbuf[1] = '\0';
981 cbuf = tbuf;
982 }
983 extra = NULL;
984 action = fcmd_decode(cbuf, &extra);
985 /*
986 * If an "extra" string was returned,
987 * process it as a string of command characters.
988 */
989 if (extra != NULL)
990 ungetsc(extra);
991 }
992 /*
993 * Clear the cmdbuf string.
994 * (But not if we're in the prefix of a command,
995 * because the partial command string is kept there.)
996 */
997 if (action != A_PREFIX)
998 cmd_reset();
999
1000 switch (action)
1001 {
1002 case A_DIGIT:
1003 /*
1004 * First digit of a number.
1005 */
1006 start_mca(A_DIGIT, ":", (void*)NULL, CF_QUIT_ON_ERASE);
1007 goto again;
1008
1009 case A_F_WINDOW:
1010 /*
1011 * Forward one window (and set the window size).
1012 */
1013 if (number > 0)
1014 swindow = (int) number;
1015 /* FALLTHRU */
1016 case A_F_SCREEN:
1017 /*
1018 * Forward one screen.
1019 */
1020 if (number <= 0)
1021 number = get_swindow();
1022 cmd_exec();
1023 if (show_attn)
1024 set_attnpos(bottompos);
1025 forward((int) number, 0, 1);
1026 break;
1027
1028 case A_B_WINDOW:
1029 /*
1030 * Backward one window (and set the window size).
1031 */
1032 if (number > 0)
1033 swindow = (int) number;
1034 /* FALLTHRU */
1035 case A_B_SCREEN:
1036 /*
1037 * Backward one screen.
1038 */
1039 if (number <= 0)
1040 number = get_swindow();
1041 cmd_exec();
1042 backward((int) number, 0, 1);
1043 break;
1044
1045 case A_F_LINE:
1046 /*
1047 * Forward N (default 1) line.
1048 */
1049 if (number <= 0)
1050 number = 1;
1051 cmd_exec();
1052 if (show_attn == OPT_ONPLUS && number > 1)
1053 set_attnpos(bottompos);
1054 forward((int) number, 0, 0);
1055 break;
1056
1057 case A_B_LINE:
1058 /*
1059 * Backward N (default 1) line.
1060 */
1061 if (number <= 0)
1062 number = 1;
1063 cmd_exec();
1064 backward((int) number, 0, 0);
1065 break;
1066
1067 case A_FF_LINE:
1068 /*
1069 * Force forward N (default 1) line.
1070 */
1071 if (number <= 0)
1072 number = 1;
1073 cmd_exec();
1074 if (show_attn == OPT_ONPLUS && number > 1)
1075 set_attnpos(bottompos);
1076 forward((int) number, 1, 0);
1077 break;
1078
1079 case A_BF_LINE:
1080 /*
1081 * Force backward N (default 1) line.
1082 */
1083 if (number <= 0)
1084 number = 1;
1085 cmd_exec();
1086 backward((int) number, 1, 0);
1087 break;
1088
1089 case A_FF_SCREEN:
1090 /*
1091 * Force forward one screen.
1092 */
1093 if (number <= 0)
1094 number = get_swindow();
1095 cmd_exec();
1096 if (show_attn == OPT_ONPLUS)
1097 set_attnpos(bottompos);
1098 forward((int) number, 1, 0);
1099 break;
1100
1101 case A_F_FOREVER:
1102 /*
1103 * Forward forever, ignoring EOF.
1104 */
1105 if (ch_getflags() & CH_HELPFILE)
1106 break;
1107 cmd_exec();
1108 jump_forw();
1109 ignore_eoi = 1;
1110 hit_eof = 0;
1111 while (!sigs)
1112 forward(1, 0, 0);
1113 ignore_eoi = 0;
1114 /*
1115 * This gets us back in "F mode" after processing
1116 * a non-abort signal (e.g. window-change).
1117 */
1118 if (sigs && !ABORT_SIGS())
1119 newaction = A_F_FOREVER;
1120 break;
1121
1122 case A_F_SCROLL:
1123 /*
1124 * Forward N lines
1125 * (default same as last 'd' or 'u' command).
1126 */
1127 if (number > 0)
1128 wscroll = (int) number;
1129 cmd_exec();
1130 if (show_attn == OPT_ONPLUS)
1131 set_attnpos(bottompos);
1132 forward(wscroll, 0, 0);
1133 break;
1134
1135 case A_B_SCROLL:
1136 /*
1137 * Forward N lines
1138 * (default same as last 'd' or 'u' command).
1139 */
1140 if (number > 0)
1141 wscroll = (int) number;
1142 cmd_exec();
1143 backward(wscroll, 0, 0);
1144 break;
1145
1146 case A_FREPAINT:
1147 /*
1148 * Flush buffers, then repaint screen.
1149 * Don't flush the buffers on a pipe!
1150 */
1151 if (ch_getflags() & CH_CANSEEK)
1152 {
1153 ch_flush();
1154 clr_linenum();
1155 #if HILITE_SEARCH
1156 clr_hilite();
1157 #endif
1158 }
1159 /* FALLTHRU */
1160 case A_REPAINT:
1161 /*
1162 * Repaint screen.
1163 */
1164 cmd_exec();
1165 repaint();
1166 break;
1167
1168 case A_GOLINE:
1169 /*
1170 * Go to line N, default beginning of file.
1171 */
1172 if (number <= 0)
1173 number = 1;
1174 cmd_exec();
1175 jump_back(number);
1176 break;
1177
1178 case A_PERCENT:
1179 /*
1180 * Go to a specified percentage into the file.
1181 */
1182 if (number < 0)
1183 {
1184 number = 0;
1185 fraction = 0;
1186 }
1187 if (number > 100)
1188 {
1189 number = 100;
1190 fraction = 0;
1191 }
1192 cmd_exec();
1193 jump_percent((int) number, fraction);
1194 break;
1195
1196 case A_GOEND:
1197 /*
1198 * Go to line N, default end of file.
1199 */
1200 cmd_exec();
1201 if (number <= 0)
1202 jump_forw();
1203 else
1204 jump_back(number);
1205 break;
1206
1207 case A_GOPOS:
1208 /*
1209 * Go to a specified byte position in the file.
1210 */
1211 cmd_exec();
1212 if (number < 0)
1213 number = 0;
1214 jump_line_loc((POSITION) number, jump_sline);
1215 break;
1216
1217 case A_STAT:
1218 /*
1219 * Print file name, etc.
1220 */
1221 if (ch_getflags() & CH_HELPFILE)
1222 break;
1223 cmd_exec();
1224 parg.p_string = eq_message();
1225 error("%s", &parg);
1226 break;
1227
1228 case A_VERSION:
1229 /*
1230 * Print version number, without the "@(#)".
1231 */
1232 cmd_exec();
1233 dispversion();
1234 break;
1235
1236 case A_QUIT:
1237 /*
1238 * Exit.
1239 */
1240 if (curr_ifile != NULL_IFILE &&
1241 ch_getflags() & CH_HELPFILE)
1242 {
1243 /*
1244 * Quit while viewing the help file
1245 * just means return to viewing the
1246 * previous file.
1247 */
1248 hshift = save_hshift;
1249 if (edit_prev(1) == 0)
1250 break;
1251 }
1252 if (extra != NULL)
1253 quit(*extra);
1254 quit(QUIT_OK);
1255 break;
1256
1257 /*
1258 * Define abbreviation for a commonly used sequence below.
1259 */
1260 #define DO_SEARCH() if (number <= 0) number = 1; \
1261 mca_search(); \
1262 cmd_exec(); \
1263 multi_search((char *)NULL, (int) number);
1264
1265
1266 case A_F_SEARCH:
1267 /*
1268 * Search forward for a pattern.
1269 * Get the first char of the pattern.
1270 */
1271 search_type = SRCH_FORW;
1272 if (number <= 0)
1273 number = 1;
1274 mca_search();
1275 c = getcc();
1276 goto again;
1277
1278 case A_B_SEARCH:
1279 /*
1280 * Search backward for a pattern.
1281 * Get the first char of the pattern.
1282 */
1283 search_type = SRCH_BACK;
1284 if (number <= 0)
1285 number = 1;
1286 mca_search();
1287 c = getcc();
1288 goto again;
1289
1290 case A_AGAIN_SEARCH:
1291 /*
1292 * Repeat previous search.
1293 */
1294 DO_SEARCH();
1295 break;
1296
1297 case A_T_AGAIN_SEARCH:
1298 /*
1299 * Repeat previous search, multiple files.
1300 */
1301 search_type |= SRCH_PAST_EOF;
1302 DO_SEARCH();
1303 break;
1304
1305 case A_REVERSE_SEARCH:
1306 /*
1307 * Repeat previous search, in reverse direction.
1308 */
1309 save_search_type = search_type;
1310 search_type = SRCH_REVERSE(search_type);
1311 DO_SEARCH();
1312 search_type = save_search_type;
1313 break;
1314
1315 case A_T_REVERSE_SEARCH:
1316 /*
1317 * Repeat previous search,
1318 * multiple files in reverse direction.
1319 */
1320 save_search_type = search_type;
1321 search_type = SRCH_REVERSE(search_type);
1322 search_type |= SRCH_PAST_EOF;
1323 DO_SEARCH();
1324 search_type = save_search_type;
1325 break;
1326
1327 case A_UNDO_SEARCH:
1328 undo_search();
1329 break;
1330
1331 case A_HELP:
1332 /*
1333 * Help.
1334 */
1335 if (ch_getflags() & CH_HELPFILE)
1336 break;
1337 cmd_exec();
1338 save_hshift = hshift;
1339 hshift = 0;
1340 (void) edit(FAKE_HELPFILE);
1341 break;
1342
1343 case A_EXAMINE:
1344 #if EXAMINE
1345 /*
1346 * Edit a new file. Get the filename.
1347 */
1348 if (secure)
1349 {
1350 error("Command not available", NULL_PARG);
1351 break;
1352 }
1353 start_mca(A_EXAMINE, "Examine: ", ml_examine, 0);
1354 c = getcc();
1355 goto again;
1356 #else
1357 error("Command not available", NULL_PARG);
1358 break;
1359 #endif
1360
1361 case A_VISUAL:
1362 /*
1363 * Invoke an editor on the input file.
1364 */
1365 #if EDITOR
1366 if (secure)
1367 {
1368 error("Command not available", NULL_PARG);
1369 break;
1370 }
1371 if (ch_getflags() & CH_HELPFILE)
1372 break;
1373 if (strcmp(get_filename(curr_ifile), "-") == 0)
1374 {
1375 error("Cannot edit standard input", NULL_PARG);
1376 break;
1377 }
1378 if (curr_altfilename != NULL)
1379 {
1380 error("WARNING: This file was viewed via LESSOPEN",
1381 NULL_PARG);
1382 }
1383 start_mca(A_SHELL, "!", ml_shell, 0);
1384 /*
1385 * Expand the editor prototype string
1386 * and pass it to the system to execute.
1387 * (Make sure the screen is displayed so the
1388 * expansion of "+%lm" works.)
1389 */
1390 make_display();
1391 cmd_exec();
1392 lsystem(pr_expand(editproto, 0), (char*)NULL);
1393 break;
1394 #else
1395 error("Command not available", NULL_PARG);
1396 break;
1397 #endif
1398
1399 case A_NEXT_FILE:
1400 /*
1401 * Examine next file.
1402 */
1403 #if TAGS
1404 if (ntags())
1405 {
1406 error("No next file", NULL_PARG);
1407 break;
1408 }
1409 #endif
1410 if (number <= 0)
1411 number = 1;
1412 if (edit_next((int) number))
1413 {
1414 if (get_quit_at_eof() && hit_eof &&
1415 !(ch_getflags() & CH_HELPFILE))
1416 quit(QUIT_OK);
1417 parg.p_string = (number > 1) ? "(N-th) " : "";
1418 error("No %snext file", &parg);
1419 }
1420 break;
1421
1422 case A_PREV_FILE:
1423 /*
1424 * Examine previous file.
1425 */
1426 #if TAGS
1427 if (ntags())
1428 {
1429 error("No previous file", NULL_PARG);
1430 break;
1431 }
1432 #endif
1433 if (number <= 0)
1434 number = 1;
1435 if (edit_prev((int) number))
1436 {
1437 parg.p_string = (number > 1) ? "(N-th) " : "";
1438 error("No %sprevious file", &parg);
1439 }
1440 break;
1441
1442 case A_NEXT_TAG:
1443 #if TAGS
1444 if (number <= 0)
1445 number = 1;
1446 tagfile = nexttag((int) number);
1447 if (tagfile == NULL)
1448 {
1449 error("No next tag", NULL_PARG);
1450 break;
1451 }
1452 if (edit(tagfile) == 0)
1453 {
1454 POSITION pos = tagsearch();
1455 if (pos != NULL_POSITION)
1456 jump_loc(pos, jump_sline);
1457 }
1458 #else
1459 error("Command not available", NULL_PARG);
1460 #endif
1461 break;
1462
1463 case A_PREV_TAG:
1464 #if TAGS
1465 if (number <= 0)
1466 number = 1;
1467 tagfile = prevtag((int) number);
1468 if (tagfile == NULL)
1469 {
1470 error("No previous tag", NULL_PARG);
1471 break;
1472 }
1473 if (edit(tagfile) == 0)
1474 {
1475 POSITION pos = tagsearch();
1476 if (pos != NULL_POSITION)
1477 jump_loc(pos, jump_sline);
1478 }
1479 #else
1480 error("Command not available", NULL_PARG);
1481 #endif
1482 break;
1483
1484 case A_INDEX_FILE:
1485 /*
1486 * Examine a particular file.
1487 */
1488 if (number <= 0)
1489 number = 1;
1490 if (edit_index((int) number))
1491 error("No such file", NULL_PARG);
1492 break;
1493
1494 case A_REMOVE_FILE:
1495 if (ch_getflags() & CH_HELPFILE)
1496 break;
1497 old_ifile = curr_ifile;
1498 new_ifile = getoff_ifile(curr_ifile);
1499 if (new_ifile == NULL_IFILE)
1500 {
1501 bell();
1502 break;
1503 }
1504 if (edit_ifile(new_ifile) != 0)
1505 {
1506 reedit_ifile(old_ifile);
1507 break;
1508 }
1509 del_ifile(old_ifile);
1510 break;
1511
1512 case A_OPT_TOGGLE:
1513 optflag = OPT_TOGGLE;
1514 optgetname = FALSE;
1515 mca_opt_toggle();
1516 c = getcc();
1517 goto again;
1518
1519 case A_DISP_OPTION:
1520 /*
1521 * Report a flag setting.
1522 */
1523 optflag = OPT_NO_TOGGLE;
1524 optgetname = FALSE;
1525 mca_opt_toggle();
1526 c = getcc();
1527 goto again;
1528
1529 case A_FIRSTCMD:
1530 /*
1531 * Set an initial command for new files.
1532 */
1533 start_mca(A_FIRSTCMD, "+", (void*)NULL, 0);
1534 c = getcc();
1535 goto again;
1536
1537 case A_SHELL:
1538 /*
1539 * Shell escape.
1540 */
1541 #if SHELL_ESCAPE
1542 if (secure)
1543 {
1544 error("Command not available", NULL_PARG);
1545 break;
1546 }
1547 start_mca(A_SHELL, "!", ml_shell, 0);
1548 c = getcc();
1549 goto again;
1550 #else
1551 error("Command not available", NULL_PARG);
1552 break;
1553 #endif
1554
1555 case A_SETMARK:
1556 /*
1557 * Set a mark.
1558 */
1559 if (ch_getflags() & CH_HELPFILE)
1560 break;
1561 start_mca(A_SETMARK, "mark: ", (void*)NULL, 0);
1562 c = getcc();
1563 if (c == erase_char || c == erase2_char ||
1564 c == kill_char || c == '\n' || c == '\r')
1565 break;
1566 setmark(c);
1567 break;
1568
1569 case A_GOMARK:
1570 /*
1571 * Go to a mark.
1572 */
1573 start_mca(A_GOMARK, "goto mark: ", (void*)NULL, 0);
1574 c = getcc();
1575 if (c == erase_char || c == erase2_char ||
1576 c == kill_char || c == '\n' || c == '\r')
1577 break;
1578 gomark(c);
1579 break;
1580
1581 case A_PIPE:
1582 #if PIPEC
1583 if (secure)
1584 {
1585 error("Command not available", NULL_PARG);
1586 break;
1587 }
1588 start_mca(A_PIPE, "|mark: ", (void*)NULL, 0);
1589 c = getcc();
1590 if (c == erase_char || c == erase2_char || c == kill_char)
1591 break;
1592 if (c == '\n' || c == '\r')
1593 c = '.';
1594 if (badmark(c))
1595 break;
1596 pipec = c;
1597 start_mca(A_PIPE, "!", ml_shell, 0);
1598 c = getcc();
1599 goto again;
1600 #else
1601 error("Command not available", NULL_PARG);
1602 break;
1603 #endif
1604
1605 case A_B_BRACKET:
1606 case A_F_BRACKET:
1607 start_mca(action, "Brackets: ", (void*)NULL, 0);
1608 c = getcc();
1609 goto again;
1610
1611 case A_LSHIFT:
1612 if (number > 0)
1613 shift_count = number;
1614 else
1615 number = (shift_count > 0) ?
1616 shift_count : sc_width / 2;
1617 if (number > hshift)
1618 number = hshift;
1619 hshift -= number;
1620 screen_trashed = 1;
1621 break;
1622
1623 case A_RSHIFT:
1624 if (number > 0)
1625 shift_count = number;
1626 else
1627 number = (shift_count > 0) ?
1628 shift_count : sc_width / 2;
1629 hshift += number;
1630 screen_trashed = 1;
1631 break;
1632
1633 case A_PREFIX:
1634 /*
1635 * The command is incomplete (more chars are needed).
1636 * Display the current char, so the user knows
1637 * what's going on, and get another character.
1638 */
1639 if (mca != A_PREFIX)
1640 {
1641 cmd_reset();
1642 start_mca(A_PREFIX, " ", (void*)NULL,
1643 CF_QUIT_ON_ERASE);
1644 (void) cmd_char(c);
1645 }
1646 c = getcc();
1647 goto again;
1648
1649 case A_NOACTION:
1650 break;
1651
1652 default:
1653 bell();
1654 break;
1655 }
1656 }
1657 }
DragonFly vkernel multiprocessor port