Update libedit from version 2012-03-11 to 2012-12-13 on vendor branch
[dragonfly.git] / contrib / libedit / src / common.c
1 /*      $NetBSD: common.c,v 1.29 2012/03/24 20:08:43 christos Exp $     */
2
3 /*-
4  * Copyright (c) 1992, 1993
5  *      The Regents of the University of California.  All rights reserved.
6  *
7  * This code is derived from software contributed to Berkeley by
8  * Christos Zoulas of Cornell University.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34
35 #include "config.h"
36 #if !defined(lint) && !defined(SCCSID)
37 #if 0
38 static char sccsid[] = "@(#)common.c    8.1 (Berkeley) 6/4/93";
39 #else
40 __RCSID("$NetBSD: common.c,v 1.29 2012/03/24 20:08:43 christos Exp $");
41 #endif
42 #endif /* not lint && not SCCSID */
43
44 /*
45  * common.c: Common Editor functions
46  */
47 #include "el.h"
48
49 /* ed_end_of_file():
50  *      Indicate end of file
51  *      [^D]
52  */
53 protected el_action_t
54 /*ARGSUSED*/
55 ed_end_of_file(EditLine *el, Int c __attribute__((__unused__)))
56 {
57
58         re_goto_bottom(el);
59         *el->el_line.lastchar = '\0';
60         return CC_EOF;
61 }
62
63
64 /* ed_insert():
65  *      Add character to the line
66  *      Insert a character [bound to all insert keys]
67  */
68 protected el_action_t
69 ed_insert(EditLine *el, Int c)
70 {
71         int count = el->el_state.argument;
72
73         if (c == '\0')
74                 return CC_ERROR;
75
76         if (el->el_line.lastchar + el->el_state.argument >=
77             el->el_line.limit) {
78                 /* end of buffer space, try to allocate more */
79                 if (!ch_enlargebufs(el, (size_t) count))
80                         return CC_ERROR;        /* error allocating more */
81         }
82
83         if (count == 1) {
84                 if (el->el_state.inputmode == MODE_INSERT
85                     || el->el_line.cursor >= el->el_line.lastchar)
86                         c_insert(el, 1);
87
88                 *el->el_line.cursor++ = c;
89                 re_fastaddc(el);                /* fast refresh for one char. */
90         } else {
91                 if (el->el_state.inputmode != MODE_REPLACE_1)
92                         c_insert(el, el->el_state.argument);
93
94                 while (count-- && el->el_line.cursor < el->el_line.lastchar)
95                         *el->el_line.cursor++ = c;
96                 re_refresh(el);
97         }
98
99         if (el->el_state.inputmode == MODE_REPLACE_1)
100                 return vi_command_mode(el, 0);
101
102         return CC_NORM;
103 }
104
105
106 /* ed_delete_prev_word():
107  *      Delete from beginning of current word to cursor
108  *      [M-^?] [^W]
109  */
110 protected el_action_t
111 /*ARGSUSED*/
112 ed_delete_prev_word(EditLine *el, Int c __attribute__((__unused__)))
113 {
114         Char *cp, *p, *kp;
115
116         if (el->el_line.cursor == el->el_line.buffer)
117                 return CC_ERROR;
118
119         cp = c__prev_word(el->el_line.cursor, el->el_line.buffer,
120             el->el_state.argument, ce__isword);
121
122         for (p = cp, kp = el->el_chared.c_kill.buf; p < el->el_line.cursor; p++)
123                 *kp++ = *p;
124         el->el_chared.c_kill.last = kp;
125
126         c_delbefore(el, (int)(el->el_line.cursor - cp));/* delete before dot */
127         el->el_line.cursor = cp;
128         if (el->el_line.cursor < el->el_line.buffer)
129                 el->el_line.cursor = el->el_line.buffer; /* bounds check */
130         return CC_REFRESH;
131 }
132
133
134 /* ed_delete_next_char():
135  *      Delete character under cursor
136  *      [^D] [x]
137  */
138 protected el_action_t
139 /*ARGSUSED*/
140 ed_delete_next_char(EditLine *el, Int c __attribute__((__unused__)))
141 {
142 #ifdef DEBUG_EDIT
143 #define EL      el->el_line
144         (void) fprintf(el->el_errlfile,
145             "\nD(b: %x(%s)  c: %x(%s) last: %x(%s) limit: %x(%s)\n",
146             EL.buffer, EL.buffer, EL.cursor, EL.cursor, EL.lastchar,
147             EL.lastchar, EL.limit, EL.limit);
148 #endif
149         if (el->el_line.cursor == el->el_line.lastchar) {
150                         /* if I'm at the end */
151                 if (el->el_map.type == MAP_VI) {
152                         if (el->el_line.cursor == el->el_line.buffer) {
153                                 /* if I'm also at the beginning */
154 #ifdef KSHVI
155                                 return CC_ERROR;
156 #else
157                                 /* then do an EOF */
158                                 terminal_writec(el, c);
159                                 return CC_EOF;
160 #endif
161                         } else {
162 #ifdef KSHVI
163                                 el->el_line.cursor--;
164 #else
165                                 return CC_ERROR;
166 #endif
167                         }
168                 } else
169                                 return CC_ERROR;
170         }
171         c_delafter(el, el->el_state.argument);  /* delete after dot */
172         if (el->el_map.type == MAP_VI &&
173             el->el_line.cursor >= el->el_line.lastchar &&
174             el->el_line.cursor > el->el_line.buffer)
175                         /* bounds check */
176                 el->el_line.cursor = el->el_line.lastchar - 1;
177         return CC_REFRESH;
178 }
179
180
181 /* ed_kill_line():
182  *      Cut to the end of line
183  *      [^K] [^K]
184  */
185 protected el_action_t
186 /*ARGSUSED*/
187 ed_kill_line(EditLine *el, Int c __attribute__((__unused__)))
188 {
189         Char *kp, *cp;
190
191         cp = el->el_line.cursor;
192         kp = el->el_chared.c_kill.buf;
193         while (cp < el->el_line.lastchar)
194                 *kp++ = *cp++;  /* copy it */
195         el->el_chared.c_kill.last = kp;
196                         /* zap! -- delete to end */
197         el->el_line.lastchar = el->el_line.cursor;
198         return CC_REFRESH;
199 }
200
201
202 /* ed_move_to_end():
203  *      Move cursor to the end of line
204  *      [^E] [^E]
205  */
206 protected el_action_t
207 /*ARGSUSED*/
208 ed_move_to_end(EditLine *el, Int c __attribute__((__unused__)))
209 {
210
211         el->el_line.cursor = el->el_line.lastchar;
212         if (el->el_map.type == MAP_VI) {
213                 if (el->el_chared.c_vcmd.action != NOP) {
214                         cv_delfini(el);
215                         return CC_REFRESH;
216                 }
217 #ifdef VI_MOVE
218                 el->el_line.cursor--;
219 #endif
220         }
221         return CC_CURSOR;
222 }
223
224
225 /* ed_move_to_beg():
226  *      Move cursor to the beginning of line
227  *      [^A] [^A]
228  */
229 protected el_action_t
230 /*ARGSUSED*/
231 ed_move_to_beg(EditLine *el, Int c __attribute__((__unused__)))
232 {
233
234         el->el_line.cursor = el->el_line.buffer;
235
236         if (el->el_map.type == MAP_VI) {
237                         /* We want FIRST non space character */
238                 while (Isspace(*el->el_line.cursor))
239                         el->el_line.cursor++;
240                 if (el->el_chared.c_vcmd.action != NOP) {
241                         cv_delfini(el);
242                         return CC_REFRESH;
243                 }
244         }
245         return CC_CURSOR;
246 }
247
248
249 /* ed_transpose_chars():
250  *      Exchange the character to the left of the cursor with the one under it
251  *      [^T] [^T]
252  */
253 protected el_action_t
254 ed_transpose_chars(EditLine *el, Int c)
255 {
256
257         if (el->el_line.cursor < el->el_line.lastchar) {
258                 if (el->el_line.lastchar <= &el->el_line.buffer[1])
259                         return CC_ERROR;
260                 else
261                         el->el_line.cursor++;
262         }
263         if (el->el_line.cursor > &el->el_line.buffer[1]) {
264                 /* must have at least two chars entered */
265                 c = el->el_line.cursor[-2];
266                 el->el_line.cursor[-2] = el->el_line.cursor[-1];
267                 el->el_line.cursor[-1] = c;
268                 return CC_REFRESH;
269         } else
270                 return CC_ERROR;
271 }
272
273
274 /* ed_next_char():
275  *      Move to the right one character
276  *      [^F] [^F]
277  */
278 protected el_action_t
279 /*ARGSUSED*/
280 ed_next_char(EditLine *el, Int c __attribute__((__unused__)))
281 {
282         Char *lim = el->el_line.lastchar;
283
284         if (el->el_line.cursor >= lim ||
285             (el->el_line.cursor == lim - 1 &&
286             el->el_map.type == MAP_VI &&
287             el->el_chared.c_vcmd.action == NOP))
288                 return CC_ERROR;
289
290         el->el_line.cursor += el->el_state.argument;
291         if (el->el_line.cursor > lim)
292                 el->el_line.cursor = lim;
293
294         if (el->el_map.type == MAP_VI)
295                 if (el->el_chared.c_vcmd.action != NOP) {
296                         cv_delfini(el);
297                         return CC_REFRESH;
298                 }
299         return CC_CURSOR;
300 }
301
302
303 /* ed_prev_word():
304  *      Move to the beginning of the current word
305  *      [M-b] [b]
306  */
307 protected el_action_t
308 /*ARGSUSED*/
309 ed_prev_word(EditLine *el, Int c __attribute__((__unused__)))
310 {
311
312         if (el->el_line.cursor == el->el_line.buffer)
313                 return CC_ERROR;
314
315         el->el_line.cursor = c__prev_word(el->el_line.cursor,
316             el->el_line.buffer,
317             el->el_state.argument,
318             ce__isword);
319
320         if (el->el_map.type == MAP_VI)
321                 if (el->el_chared.c_vcmd.action != NOP) {
322                         cv_delfini(el);
323                         return CC_REFRESH;
324                 }
325         return CC_CURSOR;
326 }
327
328
329 /* ed_prev_char():
330  *      Move to the left one character
331  *      [^B] [^B]
332  */
333 protected el_action_t
334 /*ARGSUSED*/
335 ed_prev_char(EditLine *el, Int c __attribute__((__unused__)))
336 {
337
338         if (el->el_line.cursor > el->el_line.buffer) {
339                 el->el_line.cursor -= el->el_state.argument;
340                 if (el->el_line.cursor < el->el_line.buffer)
341                         el->el_line.cursor = el->el_line.buffer;
342
343                 if (el->el_map.type == MAP_VI)
344                         if (el->el_chared.c_vcmd.action != NOP) {
345                                 cv_delfini(el);
346                                 return CC_REFRESH;
347                         }
348                 return CC_CURSOR;
349         } else
350                 return CC_ERROR;
351 }
352
353
354 /* ed_quoted_insert():
355  *      Add the next character typed verbatim
356  *      [^V] [^V]
357  */
358 protected el_action_t
359 ed_quoted_insert(EditLine *el, Int c)
360 {
361         int num;
362         Char tc;
363
364         tty_quotemode(el);
365         num = FUN(el,getc)(el, &tc);
366         c = tc;
367         tty_noquotemode(el);
368         if (num == 1)
369                 return ed_insert(el, c);
370         else
371                 return ed_end_of_file(el, 0);
372 }
373
374
375 /* ed_digit():
376  *      Adds to argument or enters a digit
377  */
378 protected el_action_t
379 ed_digit(EditLine *el, Int c)
380 {
381
382         if (!Isdigit(c))
383                 return CC_ERROR;
384
385         if (el->el_state.doingarg) {
386                         /* if doing an arg, add this in... */
387                 if (el->el_state.lastcmd == EM_UNIVERSAL_ARGUMENT)
388                         el->el_state.argument = c - '0';
389                 else {
390                         if (el->el_state.argument > 1000000)
391                                 return CC_ERROR;
392                         el->el_state.argument =
393                             (el->el_state.argument * 10) + (c - '0');
394                 }
395                 return CC_ARGHACK;
396         }
397
398         return ed_insert(el, c);
399 }
400
401
402 /* ed_argument_digit():
403  *      Digit that starts argument
404  *      For ESC-n
405  */
406 protected el_action_t
407 ed_argument_digit(EditLine *el, Int c)
408 {
409
410         if (!Isdigit(c))
411                 return CC_ERROR;
412
413         if (el->el_state.doingarg) {
414                 if (el->el_state.argument > 1000000)
415                         return CC_ERROR;
416                 el->el_state.argument = (el->el_state.argument * 10) +
417                     (c - '0');
418         } else {                /* else starting an argument */
419                 el->el_state.argument = c - '0';
420                 el->el_state.doingarg = 1;
421         }
422         return CC_ARGHACK;
423 }
424
425
426 /* ed_unassigned():
427  *      Indicates unbound character
428  *      Bound to keys that are not assigned
429  */
430 protected el_action_t
431 /*ARGSUSED*/
432 ed_unassigned(EditLine *el __attribute__((__unused__)),
433     Int c __attribute__((__unused__)))
434 {
435
436         return CC_ERROR;
437 }
438
439
440 /**
441  ** TTY key handling.
442  **/
443
444 /* ed_tty_sigint():
445  *      Tty interrupt character
446  *      [^C]
447  */
448 protected el_action_t
449 /*ARGSUSED*/
450 ed_tty_sigint(EditLine *el __attribute__((__unused__)), 
451               Int c __attribute__((__unused__)))
452 {
453
454         return CC_NORM;
455 }
456
457
458 /* ed_tty_dsusp():
459  *      Tty delayed suspend character
460  *      [^Y]
461  */
462 protected el_action_t
463 /*ARGSUSED*/
464 ed_tty_dsusp(EditLine *el __attribute__((__unused__)), 
465              Int c __attribute__((__unused__)))
466 {
467
468         return CC_NORM;
469 }
470
471
472 /* ed_tty_flush_output():
473  *      Tty flush output characters
474  *      [^O]
475  */
476 protected el_action_t
477 /*ARGSUSED*/
478 ed_tty_flush_output(EditLine *el __attribute__((__unused__)), 
479                     Int c __attribute__((__unused__)))
480 {
481
482         return CC_NORM;
483 }
484
485
486 /* ed_tty_sigquit():
487  *      Tty quit character
488  *      [^\]
489  */
490 protected el_action_t
491 /*ARGSUSED*/
492 ed_tty_sigquit(EditLine *el __attribute__((__unused__)), 
493                Int c __attribute__((__unused__)))
494 {
495
496         return CC_NORM;
497 }
498
499
500 /* ed_tty_sigtstp():
501  *      Tty suspend character
502  *      [^Z]
503  */
504 protected el_action_t
505 /*ARGSUSED*/
506 ed_tty_sigtstp(EditLine *el __attribute__((__unused__)), 
507                Int c __attribute__((__unused__)))
508 {
509
510         return CC_NORM;
511 }
512
513
514 /* ed_tty_stop_output():
515  *      Tty disallow output characters
516  *      [^S]
517  */
518 protected el_action_t
519 /*ARGSUSED*/
520 ed_tty_stop_output(EditLine *el __attribute__((__unused__)), 
521                    Int c __attribute__((__unused__)))
522 {
523
524         return CC_NORM;
525 }
526
527
528 /* ed_tty_start_output():
529  *      Tty allow output characters
530  *      [^Q]
531  */
532 protected el_action_t
533 /*ARGSUSED*/
534 ed_tty_start_output(EditLine *el __attribute__((__unused__)), 
535                     Int c __attribute__((__unused__)))
536 {
537
538         return CC_NORM;
539 }
540
541
542 /* ed_newline():
543  *      Execute command
544  *      [^J]
545  */
546 protected el_action_t
547 /*ARGSUSED*/
548 ed_newline(EditLine *el, Int c __attribute__((__unused__)))
549 {
550
551         re_goto_bottom(el);
552         *el->el_line.lastchar++ = '\n';
553         *el->el_line.lastchar = '\0';
554         return CC_NEWLINE;
555 }
556
557
558 /* ed_delete_prev_char():
559  *      Delete the character to the left of the cursor
560  *      [^?]
561  */
562 protected el_action_t
563 /*ARGSUSED*/
564 ed_delete_prev_char(EditLine *el, Int c __attribute__((__unused__)))
565 {
566
567         if (el->el_line.cursor <= el->el_line.buffer)
568                 return CC_ERROR;
569
570         c_delbefore(el, el->el_state.argument);
571         el->el_line.cursor -= el->el_state.argument;
572         if (el->el_line.cursor < el->el_line.buffer)
573                 el->el_line.cursor = el->el_line.buffer;
574         return CC_REFRESH;
575 }
576
577
578 /* ed_clear_screen():
579  *      Clear screen leaving current line at the top
580  *      [^L]
581  */
582 protected el_action_t
583 /*ARGSUSED*/
584 ed_clear_screen(EditLine *el, Int c __attribute__((__unused__)))
585 {
586
587         terminal_clear_screen(el);      /* clear the whole real screen */
588         re_clear_display(el);   /* reset everything */
589         return CC_REFRESH;
590 }
591
592
593 /* ed_redisplay():
594  *      Redisplay everything
595  *      ^R
596  */
597 protected el_action_t
598 /*ARGSUSED*/
599 ed_redisplay(EditLine *el __attribute__((__unused__)), 
600              Int c __attribute__((__unused__)))
601 {
602
603         return CC_REDISPLAY;
604 }
605
606
607 /* ed_start_over():
608  *      Erase current line and start from scratch
609  *      [^G]
610  */
611 protected el_action_t
612 /*ARGSUSED*/
613 ed_start_over(EditLine *el, Int c __attribute__((__unused__)))
614 {
615
616         ch_reset(el, 0);
617         return CC_REFRESH;
618 }
619
620
621 /* ed_sequence_lead_in():
622  *      First character in a bound sequence
623  *      Placeholder for external keys
624  */
625 protected el_action_t
626 /*ARGSUSED*/
627 ed_sequence_lead_in(EditLine *el __attribute__((__unused__)), 
628                     Int c __attribute__((__unused__)))
629 {
630
631         return CC_NORM;
632 }
633
634
635 /* ed_prev_history():
636  *      Move to the previous history line
637  *      [^P] [k]
638  */
639 protected el_action_t
640 /*ARGSUSED*/
641 ed_prev_history(EditLine *el, Int c __attribute__((__unused__)))
642 {
643         char beep = 0;
644         int sv_event = el->el_history.eventno;
645
646         el->el_chared.c_undo.len = -1;
647         *el->el_line.lastchar = '\0';           /* just in case */
648
649         if (el->el_history.eventno == 0) {      /* save the current buffer
650                                                  * away */
651                 (void) Strncpy(el->el_history.buf, el->el_line.buffer,
652                     EL_BUFSIZ);
653                 el->el_history.last = el->el_history.buf +
654                     (el->el_line.lastchar - el->el_line.buffer);
655         }
656         el->el_history.eventno += el->el_state.argument;
657
658         if (hist_get(el) == CC_ERROR) {
659                 if (el->el_map.type == MAP_VI) {
660                         el->el_history.eventno = sv_event;
661                         
662                 }
663                 beep = 1;
664                 /* el->el_history.eventno was fixed by first call */
665                 (void) hist_get(el);
666         }
667         if (beep)
668                 return CC_REFRESH_BEEP;
669         return CC_REFRESH;
670 }
671
672
673 /* ed_next_history():
674  *      Move to the next history line
675  *      [^N] [j]
676  */
677 protected el_action_t
678 /*ARGSUSED*/
679 ed_next_history(EditLine *el, Int c __attribute__((__unused__)))
680 {
681         el_action_t beep = CC_REFRESH, rval;
682
683         el->el_chared.c_undo.len = -1;
684         *el->el_line.lastchar = '\0';   /* just in case */
685
686         el->el_history.eventno -= el->el_state.argument;
687
688         if (el->el_history.eventno < 0) {
689                 el->el_history.eventno = 0;
690                 beep = CC_REFRESH_BEEP;
691         }
692         rval = hist_get(el);
693         if (rval == CC_REFRESH)
694                 return beep;
695         return rval;
696
697 }
698
699
700 /* ed_search_prev_history():
701  *      Search previous in history for a line matching the current
702  *      next search history [M-P] [K]
703  */
704 protected el_action_t
705 /*ARGSUSED*/
706 ed_search_prev_history(EditLine *el, Int c __attribute__((__unused__)))
707 {
708         const Char *hp;
709         int h;
710         bool_t found = 0;
711
712         el->el_chared.c_vcmd.action = NOP;
713         el->el_chared.c_undo.len = -1;
714         *el->el_line.lastchar = '\0';   /* just in case */
715         if (el->el_history.eventno < 0) {
716 #ifdef DEBUG_EDIT
717                 (void) fprintf(el->el_errfile,
718                     "e_prev_search_hist(): eventno < 0;\n");
719 #endif
720                 el->el_history.eventno = 0;
721                 return CC_ERROR;
722         }
723         if (el->el_history.eventno == 0) {
724                 (void) Strncpy(el->el_history.buf, el->el_line.buffer,
725                     EL_BUFSIZ);
726                 el->el_history.last = el->el_history.buf +
727                     (el->el_line.lastchar - el->el_line.buffer);
728         }
729         if (el->el_history.ref == NULL)
730                 return CC_ERROR;
731
732         hp = HIST_FIRST(el);
733         if (hp == NULL)
734                 return CC_ERROR;
735
736         c_setpat(el);           /* Set search pattern !! */
737
738         for (h = 1; h <= el->el_history.eventno; h++)
739                 hp = HIST_NEXT(el);
740
741         while (hp != NULL) {
742 #ifdef SDEBUG
743                 (void) fprintf(el->el_errfile, "Comparing with \"%s\"\n", hp);
744 #endif
745                 if ((Strncmp(hp, el->el_line.buffer, (size_t)
746                             (el->el_line.lastchar - el->el_line.buffer)) ||
747                         hp[el->el_line.lastchar - el->el_line.buffer]) &&
748                     c_hmatch(el, hp)) {
749                         found++;
750                         break;
751                 }
752                 h++;
753                 hp = HIST_NEXT(el);
754         }
755
756         if (!found) {
757 #ifdef SDEBUG
758                 (void) fprintf(el->el_errfile, "not found\n");
759 #endif
760                 return CC_ERROR;
761         }
762         el->el_history.eventno = h;
763
764         return hist_get(el);
765 }
766
767
768 /* ed_search_next_history():
769  *      Search next in history for a line matching the current
770  *      [M-N] [J]
771  */
772 protected el_action_t
773 /*ARGSUSED*/
774 ed_search_next_history(EditLine *el, Int c __attribute__((__unused__)))
775 {
776         const Char *hp;
777         int h;
778         bool_t found = 0;
779
780         el->el_chared.c_vcmd.action = NOP;
781         el->el_chared.c_undo.len = -1;
782         *el->el_line.lastchar = '\0';   /* just in case */
783
784         if (el->el_history.eventno == 0)
785                 return CC_ERROR;
786
787         if (el->el_history.ref == NULL)
788                 return CC_ERROR;
789
790         hp = HIST_FIRST(el);
791         if (hp == NULL)
792                 return CC_ERROR;
793
794         c_setpat(el);           /* Set search pattern !! */
795
796         for (h = 1; h < el->el_history.eventno && hp; h++) {
797 #ifdef SDEBUG
798                 (void) fprintf(el->el_errfile, "Comparing with \"%s\"\n", hp);
799 #endif
800                 if ((Strncmp(hp, el->el_line.buffer, (size_t)
801                             (el->el_line.lastchar - el->el_line.buffer)) ||
802                         hp[el->el_line.lastchar - el->el_line.buffer]) &&
803                     c_hmatch(el, hp))
804                         found = h;
805                 hp = HIST_NEXT(el);
806         }
807
808         if (!found) {           /* is it the current history number? */
809                 if (!c_hmatch(el, el->el_history.buf)) {
810 #ifdef SDEBUG
811                         (void) fprintf(el->el_errfile, "not found\n");
812 #endif
813                         return CC_ERROR;
814                 }
815         }
816         el->el_history.eventno = found;
817
818         return hist_get(el);
819 }
820
821
822 /* ed_prev_line():
823  *      Move up one line
824  *      Could be [k] [^p]
825  */
826 protected el_action_t
827 /*ARGSUSED*/
828 ed_prev_line(EditLine *el, Int c __attribute__((__unused__)))
829 {
830         Char *ptr;
831         int nchars = c_hpos(el);
832
833         /*
834          * Move to the line requested
835          */
836         if (*(ptr = el->el_line.cursor) == '\n')
837                 ptr--;
838
839         for (; ptr >= el->el_line.buffer; ptr--)
840                 if (*ptr == '\n' && --el->el_state.argument <= 0)
841                         break;
842
843         if (el->el_state.argument > 0)
844                 return CC_ERROR;
845
846         /*
847          * Move to the beginning of the line
848          */
849         for (ptr--; ptr >= el->el_line.buffer && *ptr != '\n'; ptr--)
850                 continue;
851
852         /*
853          * Move to the character requested
854          */
855         for (ptr++;
856             nchars-- > 0 && ptr < el->el_line.lastchar && *ptr != '\n';
857             ptr++)
858                 continue;
859
860         el->el_line.cursor = ptr;
861         return CC_CURSOR;
862 }
863
864
865 /* ed_next_line():
866  *      Move down one line
867  *      Could be [j] [^n]
868  */
869 protected el_action_t
870 /*ARGSUSED*/
871 ed_next_line(EditLine *el, Int c __attribute__((__unused__)))
872 {
873         Char *ptr;
874         int nchars = c_hpos(el);
875
876         /*
877          * Move to the line requested
878          */
879         for (ptr = el->el_line.cursor; ptr < el->el_line.lastchar; ptr++)
880                 if (*ptr == '\n' && --el->el_state.argument <= 0)
881                         break;
882
883         if (el->el_state.argument > 0)
884                 return CC_ERROR;
885
886         /*
887          * Move to the character requested
888          */
889         for (ptr++;
890             nchars-- > 0 && ptr < el->el_line.lastchar && *ptr != '\n';
891             ptr++)
892                 continue;
893
894         el->el_line.cursor = ptr;
895         return CC_CURSOR;
896 }
897
898
899 /* ed_command():
900  *      Editline extended command
901  *      [M-X] [:]
902  */
903 protected el_action_t
904 /*ARGSUSED*/
905 ed_command(EditLine *el, Int c __attribute__((__unused__)))
906 {
907         Char tmpbuf[EL_BUFSIZ];
908         int tmplen;
909
910         tmplen = c_gets(el, tmpbuf, STR("\n: "));
911         terminal__putc(el, '\n');
912
913         if (tmplen < 0 || (tmpbuf[tmplen] = 0, parse_line(el, tmpbuf)) == -1)
914                 terminal_beep(el);
915
916         el->el_map.current = el->el_map.key;
917         re_clear_display(el);
918         return CC_REFRESH;
919 }