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kernel - Fix races created by a comedy of circumstansces (3)
[dragonfly.git] / contrib / less / command.c
blobc31fa81a3218329e0774758b5d64b341f6e63285
1 /*
2 * Copyright (C) 1984-2015 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, see the README file.
8 */
9
10
11 /*
12 * User-level command processor.
13 */
14
15 #include "less.h"
16 #if MSDOS_COMPILER==WIN32C
17 #include <windows.h>
18 #endif
19 #include "position.h"
20 #include "option.h"
21 #include "cmd.h"
22
23 extern int erase_char, erase2_char, kill_char;
24 extern int sigs;
25 extern int quit_if_one_screen;
26 extern int squished;
27 extern int sc_width;
28 extern int sc_height;
29 extern int swindow;
30 extern int jump_sline;
31 extern int quitting;
32 extern int wscroll;
33 extern int top_scroll;
34 extern int ignore_eoi;
35 extern int secure;
36 extern int hshift;
37 extern int bs_mode;
38 extern int show_attn;
39 extern POSITION highest_hilite;
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 extern int same_pos_bell;
59
60 #if SHELL_ESCAPE
61 static char *shellcmd = NULL; /* For holding last shell command for "!!" */
62 #endif
63 static int mca; /* The multicharacter command (action) */
64 static int search_type; /* The previous type of search */
65 static LINENUM number; /* The number typed by the user */
66 static long fraction; /* The fractional part of the number */
67 static struct loption *curropt;
68 static int opt_lower;
69 static int optflag;
70 static int optgetname;
71 static POSITION bottompos;
72 static int save_hshift;
73 static int save_bs_mode;
74 #if PIPEC
75 static char pipec;
76 #endif
77
78 struct ungot {
79 struct ungot *ug_next;
80 char ug_char;
81 char ug_end_command;
82 };
83 static struct ungot* ungot = NULL;
84
85 static void multi_search();
86
87 /*
88 * Move the cursor to start of prompt line before executing a command.
89 * This looks nicer if the command takes a long time before
90 * updating the screen.
91 */
92 static void
93 cmd_exec()
94 {
95 #if HILITE_SEARCH
96 clear_attn();
97 #endif
98 clear_bot();
99 flush();
100 }
101
102 /*
103 * Set up the display to start a new multi-character command.
104 */
105 static void
106 start_mca(action, prompt, mlist, cmdflags)
107 int action;
108 constant char *prompt;
109 constant void *mlist;
110 int cmdflags;
111 {
112 mca = action;
113 clear_bot();
114 clear_cmd();
115 cmd_putstr(prompt);
116 set_mlist(mlist, cmdflags);
117 }
118
119 public int
120 in_mca()
121 {
122 return (mca != 0 && mca != A_PREFIX);
123 }
124
125 /*
126 * Set up the display to start a new search command.
127 */
128 static void
129 mca_search()
130 {
131 #if HILITE_SEARCH
132 if (search_type & SRCH_FILTER)
133 mca = A_FILTER;
134 else
135 #endif
136 if (search_type & SRCH_FORW)
137 mca = A_F_SEARCH;
138 else
139 mca = A_B_SEARCH;
140
141 clear_bot();
142 clear_cmd();
143
144 if (search_type & SRCH_NO_MATCH)
145 cmd_putstr("Non-match ");
146 if (search_type & SRCH_FIRST_FILE)
147 cmd_putstr("First-file ");
148 if (search_type & SRCH_PAST_EOF)
149 cmd_putstr("EOF-ignore ");
150 if (search_type & SRCH_NO_MOVE)
151 cmd_putstr("Keep-pos ");
152 if (search_type & SRCH_NO_REGEX)
153 cmd_putstr("Regex-off ");
154
155 #if HILITE_SEARCH
156 if (search_type & SRCH_FILTER)
157 cmd_putstr("&/");
158 else
159 #endif
160 if (search_type & SRCH_FORW)
161 cmd_putstr("/");
162 else
163 cmd_putstr("?");
164 forw_prompt = 0;
165 set_mlist(ml_search, 0);
166 }
167
168 /*
169 * Set up the display to start a new toggle-option command.
170 */
171 static void
172 mca_opt_toggle()
173 {
174 int no_prompt;
175 int flag;
176 char *dash;
177
178 no_prompt = (optflag & OPT_NO_PROMPT);
179 flag = (optflag & ~OPT_NO_PROMPT);
180 dash = (flag == OPT_NO_TOGGLE) ? "_" : "-";
181
182 mca = A_OPT_TOGGLE;
183 clear_bot();
184 clear_cmd();
185 cmd_putstr(dash);
186 if (optgetname)
187 cmd_putstr(dash);
188 if (no_prompt)
189 cmd_putstr("(P)");
190 switch (flag)
191 {
192 case OPT_UNSET:
193 cmd_putstr("+");
194 break;
195 case OPT_SET:
196 cmd_putstr("!");
197 break;
198 }
199 forw_prompt = 0;
200 set_mlist(NULL, 0);
201 }
202
203 /*
204 * Execute a multicharacter command.
205 */
206 static void
207 exec_mca()
208 {
209 register char *cbuf;
210
211 cmd_exec();
212 cbuf = get_cmdbuf();
213
214 switch (mca)
215 {
216 case A_F_SEARCH:
217 case A_B_SEARCH:
218 multi_search(cbuf, (int) number, 0);
219 break;
220 #if HILITE_SEARCH
221 case A_FILTER:
222 search_type ^= SRCH_NO_MATCH;
223 set_filter_pattern(cbuf, search_type);
224 break;
225 #endif
226 case A_FIRSTCMD:
227 /*
228 * Skip leading spaces or + signs in the string.
229 */
230 while (*cbuf == '+' || *cbuf == ' ')
231 cbuf++;
232 if (every_first_cmd != NULL)
233 free(every_first_cmd);
234 if (*cbuf == '\0')
235 every_first_cmd = NULL;
236 else
237 every_first_cmd = save(cbuf);
238 break;
239 case A_OPT_TOGGLE:
240 toggle_option(curropt, opt_lower, cbuf, optflag);
241 curropt = NULL;
242 break;
243 case A_F_BRACKET:
244 match_brac(cbuf[0], cbuf[1], 1, (int) number);
245 break;
246 case A_B_BRACKET:
247 match_brac(cbuf[1], cbuf[0], 0, (int) number);
248 break;
249 #if EXAMINE
250 case A_EXAMINE:
251 if (secure)
252 break;
253 edit_list(cbuf);
254 #if TAGS
255 /* If tag structure is loaded then clean it up. */
256 cleantags();
257 #endif
258 break;
259 #endif
260 #if SHELL_ESCAPE
261 case A_SHELL:
262 /*
263 * !! just uses whatever is in shellcmd.
264 * Otherwise, copy cmdbuf to shellcmd,
265 * expanding any special characters ("%" or "#").
266 */
267 if (*cbuf != '!')
268 {
269 if (shellcmd != NULL)
270 free(shellcmd);
271 shellcmd = fexpand(cbuf);
272 }
273
274 if (secure)
275 break;
276 if (shellcmd == NULL)
277 lsystem("", "!done");
278 else
279 lsystem(shellcmd, "!done");
280 break;
281 #endif
282 #if PIPEC
283 case A_PIPE:
284 if (secure)
285 break;
286 (void) pipe_mark(pipec, cbuf);
287 error("|done", NULL_PARG);
288 break;
289 #endif
290 }
291 }
292
293 /*
294 * Is a character an erase or kill char?
295 */
296 static int
297 is_erase_char(c)
298 int c;
299 {
300 return (c == erase_char || c == erase2_char || c == kill_char);
301 }
302
303 /*
304 * Handle the first char of an option (after the initial dash).
305 */
306 static int
307 mca_opt_first_char(c)
308 int c;
309 {
310 int flag = (optflag & ~OPT_NO_PROMPT);
311 if (flag == OPT_NO_TOGGLE)
312 {
313 switch (c)
314 {
315 case '_':
316 /* "__" = long option name. */
317 optgetname = TRUE;
318 mca_opt_toggle();
319 return (MCA_MORE);
320 }
321 } else
322 {
323 switch (c)
324 {
325 case '+':
326 /* "-+" = UNSET. */
327 optflag = (flag == OPT_UNSET) ?
328 OPT_TOGGLE : OPT_UNSET;
329 mca_opt_toggle();
330 return (MCA_MORE);
331 case '!':
332 /* "-!" = SET */
333 optflag = (flag == OPT_SET) ?
334 OPT_TOGGLE : OPT_SET;
335 mca_opt_toggle();
336 return (MCA_MORE);
337 case CONTROL('P'):
338 optflag ^= OPT_NO_PROMPT;
339 mca_opt_toggle();
340 return (MCA_MORE);
341 case '-':
342 /* "--" = long option name. */
343 optgetname = TRUE;
344 mca_opt_toggle();
345 return (MCA_MORE);
346 }
347 }
348 /* Char was not handled here. */
349 return (NO_MCA);
350 }
351
352 /*
353 * Add a char to a long option name.
354 * See if we've got a match for an option name yet.
355 * If so, display the complete name and stop
356 * accepting chars until user hits RETURN.
357 */
358 static int
359 mca_opt_nonfirst_char(c)
360 int c;
361 {
362 char *p;
363 char *oname;
364
365 if (curropt != NULL)
366 {
367 /*
368 * Already have a match for the name.
369 * Don't accept anything but erase/kill.
370 */
371 if (is_erase_char(c))
372 return (MCA_DONE);
373 return (MCA_MORE);
374 }
375 /*
376 * Add char to cmd buffer and try to match
377 * the option name.
378 */
379 if (cmd_char(c) == CC_QUIT)
380 return (MCA_DONE);
381 p = get_cmdbuf();
382 opt_lower = ASCII_IS_LOWER(p[0]);
383 curropt = findopt_name(&p, &oname, NULL);
384 if (curropt != NULL)
385 {
386 /*
387 * Got a match.
388 * Remember the option and
389 * display the full option name.
390 */
391 cmd_reset();
392 mca_opt_toggle();
393 for (p = oname; *p != '\0'; p++)
394 {
395 c = *p;
396 if (!opt_lower && ASCII_IS_LOWER(c))
397 c = ASCII_TO_UPPER(c);
398 if (cmd_char(c) != CC_OK)
399 return (MCA_DONE);
400 }
401 }
402 return (MCA_MORE);
403 }
404
405 /*
406 * Handle a char of an option toggle command.
407 */
408 static int
409 mca_opt_char(c)
410 int c;
411 {
412 PARG parg;
413
414 /*
415 * This may be a short option (single char),
416 * or one char of a long option name,
417 * or one char of the option parameter.
418 */
419 if (curropt == NULL && len_cmdbuf() == 0)
420 {
421 int ret = mca_opt_first_char(c);
422 if (ret != NO_MCA)
423 return (ret);
424 }
425 if (optgetname)
426 {
427 /* We're getting a long option name. */
428 if (c != '\n' && c != '\r')
429 return (mca_opt_nonfirst_char(c));
430 if (curropt == NULL)
431 {
432 parg.p_string = get_cmdbuf();
433 error("There is no --%s option", &parg);
434 return (MCA_DONE);
435 }
436 optgetname = FALSE;
437 cmd_reset();
438 } else
439 {
440 if (is_erase_char(c))
441 return (NO_MCA);
442 if (curropt != NULL)
443 /* We're getting the option parameter. */
444 return (NO_MCA);
445 curropt = findopt(c);
446 if (curropt == NULL)
447 {
448 parg.p_string = propt(c);
449 error("There is no %s option", &parg);
450 return (MCA_DONE);
451 }
452 }
453 /*
454 * If the option which was entered does not take a
455 * parameter, toggle the option immediately,
456 * so user doesn't have to hit RETURN.
457 */
458 if ((optflag & ~OPT_NO_PROMPT) != OPT_TOGGLE ||
459 !opt_has_param(curropt))
460 {
461 toggle_option(curropt, ASCII_IS_LOWER(c), "", optflag);
462 return (MCA_DONE);
463 }
464 /*
465 * Display a prompt appropriate for the option parameter.
466 */
467 start_mca(A_OPT_TOGGLE, opt_prompt(curropt), (void*)NULL, 0);
468 return (MCA_MORE);
469 }
470
471 /*
472 * Handle a char of a search command.
473 */
474 static int
475 mca_search_char(c)
476 int c;
477 {
478 int flag = 0;
479
480 /*
481 * Certain characters as the first char of
482 * the pattern have special meaning:
483 * ! Toggle the NO_MATCH flag
484 * * Toggle the PAST_EOF flag
485 * @ Toggle the FIRST_FILE flag
486 */
487 if (len_cmdbuf() > 0)
488 return (NO_MCA);
489
490 switch (c)
491 {
492 case CONTROL('E'): /* ignore END of file */
493 case '*':
494 if (mca != A_FILTER)
495 flag = SRCH_PAST_EOF;
496 break;
497 case CONTROL('F'): /* FIRST file */
498 case '@':
499 if (mca != A_FILTER)
500 flag = SRCH_FIRST_FILE;
501 break;
502 case CONTROL('K'): /* KEEP position */
503 if (mca != A_FILTER)
504 flag = SRCH_NO_MOVE;
505 break;
506 case CONTROL('R'): /* Don't use REGULAR EXPRESSIONS */
507 flag = SRCH_NO_REGEX;
508 break;
509 case CONTROL('N'): /* NOT match */
510 case '!':
511 flag = SRCH_NO_MATCH;
512 break;
513 }
514
515 if (flag != 0)
516 {
517 search_type ^= flag;
518 mca_search();
519 return (MCA_MORE);
520 }
521 return (NO_MCA);
522 }
523
524 /*
525 * Handle a character of a multi-character command.
526 */
527 static int
528 mca_char(c)
529 int c;
530 {
531 int ret;
532
533 switch (mca)
534 {
535 case 0:
536 /*
537 * We're not in a multicharacter command.
538 */
539 return (NO_MCA);
540
541 case A_PREFIX:
542 /*
543 * In the prefix of a command.
544 * This not considered a multichar command
545 * (even tho it uses cmdbuf, etc.).
546 * It is handled in the commands() switch.
547 */
548 return (NO_MCA);
549
550 case A_DIGIT:
551 /*
552 * Entering digits of a number.
553 * Terminated by a non-digit.
554 */
555 if (!((c >= '0' && c <= '9') || c == '.') &&
556 editchar(c, EC_PEEK|EC_NOHISTORY|EC_NOCOMPLETE|EC_NORIGHTLEFT) == A_INVALID)
557 {
558 /*
559 * Not part of the number.
560 * End the number and treat this char
561 * as a normal command character.
562 */
563 number = cmd_int(&fraction);
564 mca = 0;
565 cmd_accept();
566 return (NO_MCA);
567 }
568 break;
569
570 case A_OPT_TOGGLE:
571 ret = mca_opt_char(c);
572 if (ret != NO_MCA)
573 return (ret);
574 break;
575
576 case A_F_SEARCH:
577 case A_B_SEARCH:
578 case A_FILTER:
579 ret = mca_search_char(c);
580 if (ret != NO_MCA)
581 return (ret);
582 break;
583
584 default:
585 /* Other multicharacter command. */
586 break;
587 }
588
589 /*
590 * The multichar command is terminated by a newline.
591 */
592 if (c == '\n' || c == '\r')
593 {
594 /*
595 * Execute the command.
596 */
597 exec_mca();
598 return (MCA_DONE);
599 }
600
601 /*
602 * Append the char to the command buffer.
603 */
604 if (cmd_char(c) == CC_QUIT)
605 /*
606 * Abort the multi-char command.
607 */
608 return (MCA_DONE);
609
610 if ((mca == A_F_BRACKET || mca == A_B_BRACKET) && len_cmdbuf() >= 2)
611 {
612 /*
613 * Special case for the bracket-matching commands.
614 * Execute the command after getting exactly two
615 * characters from the user.
616 */
617 exec_mca();
618 return (MCA_DONE);
619 }
620
621 /*
622 * Need another character.
623 */
624 return (MCA_MORE);
625 }
626
627 /*
628 * Discard any buffered file data.
629 */
630 static void
631 clear_buffers()
632 {
633 if (!(ch_getflags() & CH_CANSEEK))
634 return;
635 ch_flush();
636 clr_linenum();
637 #if HILITE_SEARCH
638 clr_hilite();
639 #endif
640 }
641
642 /*
643 * Make sure the screen is displayed.
644 */
645 static void
646 make_display()
647 {
648 /*
649 * If nothing is displayed yet, display starting from initial_scrpos.
650 */
651 if (empty_screen())
652 {
653 if (initial_scrpos.pos == NULL_POSITION)
654 /*
655 * {{ Maybe this should be:
656 * jump_loc(ch_zero(), jump_sline);
657 * but this behavior seems rather unexpected
658 * on the first screen. }}
659 */
660 jump_loc(ch_zero(), 1);
661 else
662 jump_loc(initial_scrpos.pos, initial_scrpos.ln);
663 } else if (screen_trashed)
664 {
665 int save_top_scroll = top_scroll;
666 int save_ignore_eoi = ignore_eoi;
667 top_scroll = 1;
668 ignore_eoi = 0;
669 if (screen_trashed == 2)
670 {
671 /* Special case used by ignore_eoi: re-open the input file
672 * and jump to the end of the file. */
673 reopen_curr_ifile();
674 jump_forw();
675 }
676 repaint();
677 top_scroll = save_top_scroll;
678 ignore_eoi = save_ignore_eoi;
679 }
680 }
681
682 /*
683 * Display the appropriate prompt.
684 */
685 static void
686 prompt()
687 {
688 register constant char *p;
689
690 if (ungot != NULL && !ungot->ug_end_command)
691 {
692 /*
693 * No prompt necessary if commands are from
694 * ungotten chars rather than from the user.
695 */
696 return;
697 }
698
699 /*
700 * Make sure the screen is displayed.
701 */
702 make_display();
703 bottompos = position(BOTTOM_PLUS_ONE);
704
705 /*
706 * If we've hit EOF on the last file and the -E flag is set, quit.
707 */
708 if (get_quit_at_eof() == OPT_ONPLUS &&
709 eof_displayed() && !(ch_getflags() & CH_HELPFILE) &&
710 next_ifile(curr_ifile) == NULL_IFILE)
711 quit(QUIT_OK);
712
713 /*
714 * If the entire file is displayed and the -F flag is set, quit.
715 */
716 if (quit_if_one_screen &&
717 entire_file_displayed() && !(ch_getflags() & CH_HELPFILE) &&
718 next_ifile(curr_ifile) == NULL_IFILE)
719 quit(QUIT_OK);
720
721 #if MSDOS_COMPILER==WIN32C
722 /*
723 * In Win32, display the file name in the window title.
724 */
725 if (!(ch_getflags() & CH_HELPFILE))
726 SetConsoleTitle(pr_expand("Less?f - %f.", 0));
727 #endif
728 /*
729 * Select the proper prompt and display it.
730 */
731 /*
732 * If the previous action was a forward movement,
733 * don't clear the bottom line of the display;
734 * just print the prompt since the forward movement guarantees
735 * that we're in the right position to display the prompt.
736 * Clearing the line could cause a problem: for example, if the last
737 * line displayed ended at the right screen edge without a newline,
738 * then clearing would clear the last displayed line rather than
739 * the prompt line.
740 */
741 if (!forw_prompt)
742 clear_bot();
743 clear_cmd();
744 forw_prompt = 0;
745 p = pr_string();
746 if (is_filtering())
747 putstr("& ");
748 if (p == NULL || *p == '\0')
749 putchr(':');
750 else
751 {
752 at_enter(AT_STANDOUT);
753 putstr(p);
754 at_exit();
755 }
756 clear_eol();
757 }
758
759 /*
760 * Display the less version message.
761 */
762 public void
763 dispversion()
764 {
765 PARG parg;
766
767 parg.p_string = version;
768 error("less %s", &parg);
769 }
770
771 /*
772 * Get command character.
773 * The character normally comes from the keyboard,
774 * but may come from ungotten characters
775 * (characters previously given to ungetcc or ungetsc).
776 */
777 public int
778 getcc()
779 {
780 if (ungot == NULL)
781 {
782 /*
783 * Normal case: no ungotten chars, so get one from the user.
784 */
785 return (getchr());
786 }
787
788 /*
789 * Return the next ungotten char.
790 */
791 {
792 struct ungot *ug = ungot;
793 char c = ug->ug_char;
794 int end_command = ug->ug_end_command;
795 ungot = ug->ug_next;
796 free(ug);
797 if (end_command)
798 {
799 /*
800 * Command is incomplete, so try to complete it.
801 */
802 switch (mca)
803 {
804 case A_DIGIT:
805 /*
806 * We have a number but no command. Treat as #g.
807 */
808 return ('g');
809
810 case A_F_SEARCH:
811 case A_B_SEARCH:
812 /*
813 * We have "/string" but no newline. Add the \n.
814 */
815 return ('\n');
816
817 default:
818 /*
819 * Some other incomplete command. Let user complete it.
820 */
821 return (getchr());
822 }
823 }
824 return (c);
825 }
826 }
827
828 /*
829 * "Unget" a command character.
830 * The next getcc() will return this character.
831 */
832 public void
833 ungetcc(c)
834 int c;
835 {
836 struct ungot *ug = (struct ungot *) ecalloc(1, sizeof(struct ungot));
837
838 ug->ug_char = (char) c;
839 ug->ug_end_command = (c == CHAR_END_COMMAND);
840 ug->ug_next = ungot;
841 ungot = ug;
842 }
843
844 /*
845 * Unget a whole string of command characters.
846 * The next sequence of getcc()'s will return this string.
847 */
848 public void
849 ungetsc(s)
850 char *s;
851 {
852 register char *p;
853
854 for (p = s + strlen(s) - 1; p >= s; p--)
855 ungetcc(*p);
856 }
857
858 /*
859 * Search for a pattern, possibly in multiple files.
860 * If SRCH_FIRST_FILE is set, begin searching at the first file.
861 * If SRCH_PAST_EOF is set, continue the search thru multiple files.
862 */
863 static void
864 multi_search(pattern, n, silent)
865 char *pattern;
866 int n;
867 int silent;
868 {
869 register int nomore;
870 IFILE save_ifile;
871 int changed_file;
872
873 changed_file = 0;
874 save_ifile = save_curr_ifile();
875
876 if (search_type & SRCH_FIRST_FILE)
877 {
878 /*
879 * Start at the first (or last) file
880 * in the command line list.
881 */
882 if (search_type & SRCH_FORW)
883 nomore = edit_first();
884 else
885 nomore = edit_last();
886 if (nomore)
887 {
888 unsave_ifile(save_ifile);
889 return;
890 }
891 changed_file = 1;
892 search_type &= ~SRCH_FIRST_FILE;
893 }
894
895 for (;;)
896 {
897 n = search(search_type, pattern, n);
898 /*
899 * The SRCH_NO_MOVE flag doesn't "stick": it gets cleared
900 * after being used once. This allows "n" to work after
901 * using a /@@ search.
902 */
903 search_type &= ~SRCH_NO_MOVE;
904 if (n == 0)
905 {
906 /*
907 * Found it.
908 */
909 unsave_ifile(save_ifile);
910 return;
911 }
912
913 if (n < 0)
914 /*
915 * Some kind of error in the search.
916 * Error message has been printed by search().
917 */
918 break;
919
920 if ((search_type & SRCH_PAST_EOF) == 0)
921 /*
922 * We didn't find a match, but we're
923 * supposed to search only one file.
924 */
925 break;
926 /*
927 * Move on to the next file.
928 */
929 if (search_type & SRCH_FORW)
930 nomore = edit_next(1);
931 else
932 nomore = edit_prev(1);
933 if (nomore)
934 break;
935 changed_file = 1;
936 }
937
938 /*
939 * Didn't find it.
940 * Print an error message if we haven't already.
941 */
942 if (n > 0 && !silent)
943 error("Pattern not found", NULL_PARG);
944
945 if (changed_file)
946 {
947 /*
948 * Restore the file we were originally viewing.
949 */
950 reedit_ifile(save_ifile);
951 } else
952 {
953 unsave_ifile(save_ifile);
954 }
955 }
956
957 /*
958 * Forward forever, or until a highlighted line appears.
959 */
960 static int
961 forw_loop(until_hilite)
962 int until_hilite;
963 {
964 POSITION curr_len;
965
966 if (ch_getflags() & CH_HELPFILE)
967 return (A_NOACTION);
968
969 cmd_exec();
970 jump_forw_buffered();
971 curr_len = ch_length();
972 highest_hilite = until_hilite ? curr_len : NULL_POSITION;
973 ignore_eoi = 1;
974 while (!sigs)
975 {
976 if (until_hilite && highest_hilite > curr_len)
977 {
978 bell();
979 break;
980 }
981 make_display();
982 forward(1, 0, 0);
983 }
984 ignore_eoi = 0;
985 ch_set_eof();
986
987 /*
988 * This gets us back in "F mode" after processing
989 * a non-abort signal (e.g. window-change).
990 */
991 if (sigs && !ABORT_SIGS())
992 return (until_hilite ? A_F_UNTIL_HILITE : A_F_FOREVER);
993
994 return (A_NOACTION);
995 }
996
997 /*
998 * Main command processor.
999 * Accept and execute commands until a quit command.
1000 */
1001 public void
1002 commands()
1003 {
1004 register int c;
1005 register int action;
1006 register char *cbuf;
1007 int newaction;
1008 int save_search_type;
1009 char *extra;
1010 char tbuf[2];
1011 PARG parg;
1012 IFILE old_ifile;
1013 IFILE new_ifile;
1014 char *tagfile;
1015
1016 search_type = SRCH_FORW;
1017 wscroll = (sc_height + 1) / 2;
1018 newaction = A_NOACTION;
1019
1020 for (;;)
1021 {
1022 mca = 0;
1023 cmd_accept();
1024 number = 0;
1025 curropt = NULL;
1026
1027 /*
1028 * See if any signals need processing.
1029 */
1030 if (sigs)
1031 {
1032 psignals();
1033 if (quitting)
1034 quit(QUIT_SAVED_STATUS);
1035 }
1036
1037 /*
1038 * See if window size changed, for systems that don't
1039 * generate SIGWINCH.
1040 */
1041 check_winch();
1042
1043 /*
1044 * Display prompt and accept a character.
1045 */
1046 cmd_reset();
1047 prompt();
1048 if (sigs)
1049 continue;
1050 if (newaction == A_NOACTION)
1051 c = getcc();
1052
1053 again:
1054 if (sigs)
1055 continue;
1056
1057 if (newaction != A_NOACTION)
1058 {
1059 action = newaction;
1060 newaction = A_NOACTION;
1061 } else
1062 {
1063 /*
1064 * If we are in a multicharacter command, call mca_char.
1065 * Otherwise we call fcmd_decode to determine the
1066 * action to be performed.
1067 */
1068 if (mca)
1069 switch (mca_char(c))
1070 {
1071 case MCA_MORE:
1072 /*
1073 * Need another character.
1074 */
1075 c = getcc();
1076 goto again;
1077 case MCA_DONE:
1078 /*
1079 * Command has been handled by mca_char.
1080 * Start clean with a prompt.
1081 */
1082 continue;
1083 case NO_MCA:
1084 /*
1085 * Not a multi-char command
1086 * (at least, not anymore).
1087 */
1088 break;
1089 }
1090
1091 /*
1092 * Decode the command character and decide what to do.
1093 */
1094 if (mca)
1095 {
1096 /*
1097 * We're in a multichar command.
1098 * Add the character to the command buffer
1099 * and display it on the screen.
1100 * If the user backspaces past the start
1101 * of the line, abort the command.
1102 */
1103 if (cmd_char(c) == CC_QUIT || len_cmdbuf() == 0)
1104 continue;
1105 cbuf = get_cmdbuf();
1106 } else
1107 {
1108 /*
1109 * Don't use cmd_char if we're starting fresh
1110 * at the beginning of a command, because we
1111 * don't want to echo the command until we know
1112 * it is a multichar command. We also don't
1113 * want erase_char/kill_char to be treated
1114 * as line editing characters.
1115 */
1116 tbuf[0] = c;
1117 tbuf[1] = '\0';
1118 cbuf = tbuf;
1119 }
1120 extra = NULL;
1121 action = fcmd_decode(cbuf, &extra);
1122 /*
1123 * If an "extra" string was returned,
1124 * process it as a string of command characters.
1125 */
1126 if (extra != NULL)
1127 ungetsc(extra);
1128 }
1129 /*
1130 * Clear the cmdbuf string.
1131 * (But not if we're in the prefix of a command,
1132 * because the partial command string is kept there.)
1133 */
1134 if (action != A_PREFIX)
1135 cmd_reset();
1136
1137 switch (action)
1138 {
1139 case A_DIGIT:
1140 /*
1141 * First digit of a number.
1142 */
1143 start_mca(A_DIGIT, ":", (void*)NULL, CF_QUIT_ON_ERASE);
1144 goto again;
1145
1146 case A_F_WINDOW:
1147 /*
1148 * Forward one window (and set the window size).
1149 */
1150 if (number > 0)
1151 swindow = (int) number;
1152 /* FALLTHRU */
1153 case A_F_SCREEN:
1154 /*
1155 * Forward one screen.
1156 */
1157 if (number <= 0)
1158 number = get_swindow();
1159 cmd_exec();
1160 if (show_attn)
1161 set_attnpos(bottompos);
1162 forward((int) number, 0, 1);
1163 break;
1164
1165 case A_B_WINDOW:
1166 /*
1167 * Backward one window (and set the window size).
1168 */
1169 if (number > 0)
1170 swindow = (int) number;
1171 /* FALLTHRU */
1172 case A_B_SCREEN:
1173 /*
1174 * Backward one screen.
1175 */
1176 if (number <= 0)
1177 number = get_swindow();
1178 cmd_exec();
1179 backward((int) number, 0, 1);
1180 break;
1181
1182 case A_F_LINE:
1183 /*
1184 * Forward N (default 1) line.
1185 */
1186 if (number <= 0)
1187 number = 1;
1188 cmd_exec();
1189 if (show_attn == OPT_ONPLUS && number > 1)
1190 set_attnpos(bottompos);
1191 forward((int) number, 0, 0);
1192 break;
1193
1194 case A_B_LINE:
1195 /*
1196 * Backward N (default 1) line.
1197 */
1198 if (number <= 0)
1199 number = 1;
1200 cmd_exec();
1201 backward((int) number, 0, 0);
1202 break;
1203
1204 case A_FF_LINE:
1205 /*
1206 * Force forward N (default 1) line.
1207 */
1208 if (number <= 0)
1209 number = 1;
1210 cmd_exec();
1211 if (show_attn == OPT_ONPLUS && number > 1)
1212 set_attnpos(bottompos);
1213 forward((int) number, 1, 0);
1214 break;
1215
1216 case A_BF_LINE:
1217 /*
1218 * Force backward N (default 1) line.
1219 */
1220 if (number <= 0)
1221 number = 1;
1222 cmd_exec();
1223 backward((int) number, 1, 0);
1224 break;
1225
1226 case A_FF_SCREEN:
1227 /*
1228 * Force forward one screen.
1229 */
1230 if (number <= 0)
1231 number = get_swindow();
1232 cmd_exec();
1233 if (show_attn == OPT_ONPLUS)
1234 set_attnpos(bottompos);
1235 forward((int) number, 1, 0);
1236 break;
1237
1238 case A_F_FOREVER:
1239 /*
1240 * Forward forever, ignoring EOF.
1241 */
1242 if (show_attn)
1243 set_attnpos(bottompos);
1244 newaction = forw_loop(0);
1245 break;
1246
1247 case A_F_UNTIL_HILITE:
1248 newaction = forw_loop(1);
1249 break;
1250
1251 case A_F_SCROLL:
1252 /*
1253 * Forward N lines
1254 * (default same as last 'd' or 'u' command).
1255 */
1256 if (number > 0)
1257 wscroll = (int) number;
1258 cmd_exec();
1259 if (show_attn == OPT_ONPLUS)
1260 set_attnpos(bottompos);
1261 forward(wscroll, 0, 0);
1262 break;
1263
1264 case A_B_SCROLL:
1265 /*
1266 * Forward N lines
1267 * (default same as last 'd' or 'u' command).
1268 */
1269 if (number > 0)
1270 wscroll = (int) number;
1271 cmd_exec();
1272 backward(wscroll, 0, 0);
1273 break;
1274
1275 case A_FREPAINT:
1276 /*
1277 * Flush buffers, then repaint screen.
1278 * Don't flush the buffers on a pipe!
1279 */
1280 clear_buffers();
1281 /* FALLTHRU */
1282 case A_REPAINT:
1283 /*
1284 * Repaint screen.
1285 */
1286 cmd_exec();
1287 repaint();
1288 break;
1289
1290 case A_GOLINE:
1291 /*
1292 * Go to line N, default beginning of file.
1293 */
1294 if (number <= 0)
1295 number = 1;
1296 cmd_exec();
1297 jump_back(number);
1298 break;
1299
1300 case A_PERCENT:
1301 /*
1302 * Go to a specified percentage into the file.
1303 */
1304 if (number < 0)
1305 {
1306 number = 0;
1307 fraction = 0;
1308 }
1309 if (number > 100)
1310 {
1311 number = 100;
1312 fraction = 0;
1313 }
1314 cmd_exec();
1315 jump_percent((int) number, fraction);
1316 break;
1317
1318 case A_GOEND:
1319 /*
1320 * Go to line N, default end of file.
1321 */
1322 cmd_exec();
1323 if (number <= 0)
1324 jump_forw();
1325 else
1326 jump_back(number);
1327 break;
1328
1329 case A_GOEND_BUF:
1330 /*
1331 * Go to line N, default last buffered byte.
1332 */
1333 cmd_exec();
1334 if (number <= 0)
1335 jump_forw_buffered();
1336 else
1337 jump_back(number);
1338 break;
1339
1340 case A_GOPOS:
1341 /*
1342 * Go to a specified byte position in the file.
1343 */
1344 cmd_exec();
1345 if (number < 0)
1346 number = 0;
1347 jump_line_loc((POSITION) number, jump_sline);
1348 break;
1349
1350 case A_STAT:
1351 /*
1352 * Print file name, etc.
1353 */
1354 if (ch_getflags() & CH_HELPFILE)
1355 break;
1356 cmd_exec();
1357 parg.p_string = eq_message();
1358 error("%s", &parg);
1359 break;
1360
1361 case A_VERSION:
1362 /*
1363 * Print version number, without the "@(#)".
1364 */
1365 cmd_exec();
1366 dispversion();
1367 break;
1368
1369 case A_QUIT:
1370 /*
1371 * Exit.
1372 */
1373 if (curr_ifile != NULL_IFILE &&
1374 ch_getflags() & CH_HELPFILE)
1375 {
1376 /*
1377 * Quit while viewing the help file
1378 * just means return to viewing the
1379 * previous file.
1380 */
1381 hshift = save_hshift;
1382 bs_mode = save_bs_mode;
1383 if (edit_prev(1) == 0)
1384 break;
1385 }
1386 if (extra != NULL)
1387 quit(*extra);
1388 quit(QUIT_OK);
1389 break;
1390
1391 /*
1392 * Define abbreviation for a commonly used sequence below.
1393 */
1394 #define DO_SEARCH() \
1395 if (number <= 0) number = 1; \
1396 mca_search(); \
1397 cmd_exec(); \
1398 multi_search((char *)NULL, (int) number, 0);
1399
1400
1401 case A_F_SEARCH:
1402 /*
1403 * Search forward for a pattern.
1404 * Get the first char of the pattern.
1405 */
1406 search_type = SRCH_FORW;
1407 if (number <= 0)
1408 number = 1;
1409 mca_search();
1410 c = getcc();
1411 goto again;
1412
1413 case A_B_SEARCH:
1414 /*
1415 * Search backward for a pattern.
1416 * Get the first char of the pattern.
1417 */
1418 search_type = SRCH_BACK;
1419 if (number <= 0)
1420 number = 1;
1421 mca_search();
1422 c = getcc();
1423 goto again;
1424
1425 case A_FILTER:
1426 #if HILITE_SEARCH
1427 search_type = SRCH_FORW | SRCH_FILTER;
1428 mca_search();
1429 c = getcc();
1430 goto again;
1431 #else
1432 error("Command not available", NULL_PARG);
1433 break;
1434 #endif
1435
1436 case A_AGAIN_SEARCH:
1437 /*
1438 * Repeat previous search.
1439 */
1440 DO_SEARCH();
1441 break;
1442
1443 case A_T_AGAIN_SEARCH:
1444 /*
1445 * Repeat previous search, multiple files.
1446 */
1447 search_type |= SRCH_PAST_EOF;
1448 DO_SEARCH();
1449 break;
1450
1451 case A_REVERSE_SEARCH:
1452 /*
1453 * Repeat previous search, in reverse direction.
1454 */
1455 save_search_type = search_type;
1456 search_type = SRCH_REVERSE(search_type);
1457 DO_SEARCH();
1458 search_type = save_search_type;
1459 break;
1460
1461 case A_T_REVERSE_SEARCH:
1462 /*
1463 * Repeat previous search,
1464 * multiple files in reverse direction.
1465 */
1466 save_search_type = search_type;
1467 search_type = SRCH_REVERSE(search_type);
1468 search_type |= SRCH_PAST_EOF;
1469 DO_SEARCH();
1470 search_type = save_search_type;
1471 break;
1472
1473 case A_UNDO_SEARCH:
1474 undo_search();
1475 break;
1476
1477 case A_HELP:
1478 /*
1479 * Help.
1480 */
1481 if (ch_getflags() & CH_HELPFILE)
1482 break;
1483 cmd_exec();
1484 save_hshift = hshift;
1485 hshift = 0;
1486 save_bs_mode = bs_mode;
1487 bs_mode = BS_SPECIAL;
1488 (void) edit(FAKE_HELPFILE);
1489 break;
1490
1491 case A_EXAMINE:
1492 #if EXAMINE
1493 /*
1494 * Edit a new file. Get the filename.
1495 */
1496 if (secure)
1497 {
1498 error("Command not available", NULL_PARG);
1499 break;
1500 }
1501 start_mca(A_EXAMINE, "Examine: ", ml_examine, 0);
1502 c = getcc();
1503 goto again;
1504 #else
1505 error("Command not available", NULL_PARG);
1506 break;
1507 #endif
1508
1509 case A_VISUAL:
1510 /*
1511 * Invoke an editor on the input file.
1512 */
1513 #if EDITOR
1514 if (secure)
1515 {
1516 error("Command not available", NULL_PARG);
1517 break;
1518 }
1519 if (ch_getflags() & CH_HELPFILE)
1520 break;
1521 if (strcmp(get_filename(curr_ifile), "-") == 0)
1522 {
1523 error("Cannot edit standard input", NULL_PARG);
1524 break;
1525 }
1526 if (curr_altfilename != NULL)
1527 {
1528 error("WARNING: This file was viewed via LESSOPEN",
1529 NULL_PARG);
1530 }
1531 start_mca(A_SHELL, "!", ml_shell, 0);
1532 /*
1533 * Expand the editor prototype string
1534 * and pass it to the system to execute.
1535 * (Make sure the screen is displayed so the
1536 * expansion of "+%lm" works.)
1537 */
1538 make_display();
1539 cmd_exec();
1540 lsystem(pr_expand(editproto, 0), (char*)NULL);
1541 break;
1542 #else
1543 error("Command not available", NULL_PARG);
1544 break;
1545 #endif
1546
1547 case A_NEXT_FILE:
1548 /*
1549 * Examine next file.
1550 */
1551 #if TAGS
1552 if (ntags())
1553 {
1554 error("No next file", NULL_PARG);
1555 break;
1556 }
1557 #endif
1558 if (number <= 0)
1559 number = 1;
1560 if (edit_next((int) number))
1561 {
1562 if (get_quit_at_eof() && eof_displayed() &&
1563 !(ch_getflags() & CH_HELPFILE))
1564 quit(QUIT_OK);
1565 parg.p_string = (number > 1) ? "(N-th) " : "";
1566 error("No %snext file", &parg);
1567 }
1568 break;
1569
1570 case A_PREV_FILE:
1571 /*
1572 * Examine previous file.
1573 */
1574 #if TAGS
1575 if (ntags())
1576 {
1577 error("No previous file", NULL_PARG);
1578 break;
1579 }
1580 #endif
1581 if (number <= 0)
1582 number = 1;
1583 if (edit_prev((int) number))
1584 {
1585 parg.p_string = (number > 1) ? "(N-th) " : "";
1586 error("No %sprevious file", &parg);
1587 }
1588 break;
1589
1590 case A_NEXT_TAG:
1591 #if TAGS
1592 if (number <= 0)
1593 number = 1;
1594 tagfile = nexttag((int) number);
1595 if (tagfile == NULL)
1596 {
1597 error("No next tag", NULL_PARG);
1598 break;
1599 }
1600 if (edit(tagfile) == 0)
1601 {
1602 POSITION pos = tagsearch();
1603 if (pos != NULL_POSITION)
1604 jump_loc(pos, jump_sline);
1605 }
1606 #else
1607 error("Command not available", NULL_PARG);
1608 #endif
1609 break;
1610
1611 case A_PREV_TAG:
1612 #if TAGS
1613 if (number <= 0)
1614 number = 1;
1615 tagfile = prevtag((int) number);
1616 if (tagfile == NULL)
1617 {
1618 error("No previous tag", NULL_PARG);
1619 break;
1620 }
1621 if (edit(tagfile) == 0)
1622 {
1623 POSITION pos = tagsearch();
1624 if (pos != NULL_POSITION)
1625 jump_loc(pos, jump_sline);
1626 }
1627 #else
1628 error("Command not available", NULL_PARG);
1629 #endif
1630 break;
1631
1632 case A_INDEX_FILE:
1633 /*
1634 * Examine a particular file.
1635 */
1636 if (number <= 0)
1637 number = 1;
1638 if (edit_index((int) number))
1639 error("No such file", NULL_PARG);
1640 break;
1641
1642 case A_REMOVE_FILE:
1643 if (ch_getflags() & CH_HELPFILE)
1644 break;
1645 old_ifile = curr_ifile;
1646 new_ifile = getoff_ifile(curr_ifile);
1647 if (new_ifile == NULL_IFILE)
1648 {
1649 bell();
1650 break;
1651 }
1652 if (edit_ifile(new_ifile) != 0)
1653 {
1654 reedit_ifile(old_ifile);
1655 break;
1656 }
1657 del_ifile(old_ifile);
1658 break;
1659
1660 case A_OPT_TOGGLE:
1661 optflag = OPT_TOGGLE;
1662 optgetname = FALSE;
1663 mca_opt_toggle();
1664 c = getcc();
1665 goto again;
1666
1667 case A_DISP_OPTION:
1668 /*
1669 * Report a flag setting.
1670 */
1671 optflag = OPT_NO_TOGGLE;
1672 optgetname = FALSE;
1673 mca_opt_toggle();
1674 c = getcc();
1675 goto again;
1676
1677 case A_FIRSTCMD:
1678 /*
1679 * Set an initial command for new files.
1680 */
1681 start_mca(A_FIRSTCMD, "+", (void*)NULL, 0);
1682 c = getcc();
1683 goto again;
1684
1685 case A_SHELL:
1686 /*
1687 * Shell escape.
1688 */
1689 #if SHELL_ESCAPE
1690 if (secure)
1691 {
1692 error("Command not available", NULL_PARG);
1693 break;
1694 }
1695 start_mca(A_SHELL, "!", ml_shell, 0);
1696 c = getcc();
1697 goto again;
1698 #else
1699 error("Command not available", NULL_PARG);
1700 break;
1701 #endif
1702
1703 case A_SETMARK:
1704 /*
1705 * Set a mark.
1706 */
1707 if (ch_getflags() & CH_HELPFILE)
1708 break;
1709 start_mca(A_SETMARK, "mark: ", (void*)NULL, 0);
1710 c = getcc();
1711 if (c == erase_char || c == erase2_char ||
1712 c == kill_char || c == '\n' || c == '\r')
1713 break;
1714 setmark(c);
1715 break;
1716
1717 case A_GOMARK:
1718 /*
1719 * Go to a mark.
1720 */
1721 start_mca(A_GOMARK, "goto mark: ", (void*)NULL, 0);
1722 c = getcc();
1723 if (c == erase_char || c == erase2_char ||
1724 c == kill_char || c == '\n' || c == '\r')
1725 break;
1726 cmd_exec();
1727 gomark(c);
1728 break;
1729
1730 case A_PIPE:
1731 #if PIPEC
1732 if (secure)
1733 {
1734 error("Command not available", NULL_PARG);
1735 break;
1736 }
1737 start_mca(A_PIPE, "|mark: ", (void*)NULL, 0);
1738 c = getcc();
1739 if (c == erase_char || c == erase2_char || c == kill_char)
1740 break;
1741 if (c == '\n' || c == '\r')
1742 c = '.';
1743 if (badmark(c))
1744 break;
1745 pipec = c;
1746 start_mca(A_PIPE, "!", ml_shell, 0);
1747 c = getcc();
1748 goto again;
1749 #else
1750 error("Command not available", NULL_PARG);
1751 break;
1752 #endif
1753
1754 case A_B_BRACKET:
1755 case A_F_BRACKET:
1756 start_mca(action, "Brackets: ", (void*)NULL, 0);
1757 c = getcc();
1758 goto again;
1759
1760 case A_LSHIFT:
1761 if (number > 0)
1762 shift_count = number;
1763 else
1764 number = (shift_count > 0) ?
1765 shift_count : sc_width / 2;
1766 if (number > hshift)
1767 number = hshift;
1768 hshift -= number;
1769 screen_trashed = 1;
1770 break;
1771
1772 case A_RSHIFT:
1773 if (number > 0)
1774 shift_count = number;
1775 else
1776 number = (shift_count > 0) ?
1777 shift_count : sc_width / 2;
1778 hshift += number;
1779 screen_trashed = 1;
1780 break;
1781
1782 case A_PREFIX:
1783 /*
1784 * The command is incomplete (more chars are needed).
1785 * Display the current char, so the user knows
1786 * what's going on, and get another character.
1787 */
1788 if (mca != A_PREFIX)
1789 {
1790 cmd_reset();
1791 start_mca(A_PREFIX, " ", (void*)NULL,
1792 CF_QUIT_ON_ERASE);
1793 (void) cmd_char(c);
1794 }
1795 c = getcc();
1796 goto again;
1797
1798 case A_NOACTION:
1799 break;
1800
1801 default:
1802 bell();
1803 break;
1804 }
1805 }
1806 }
DragonFly BSD