1 /* $NetBSD: chared.c,v 1.40 2014/06/18 18:12:28 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[] = "@(#)chared.c 8.1 (Berkeley) 6/4/93";
39 #else
40 __RCSID("$NetBSD: chared.c,v 1.40 2014/06/18 18:12:28 christos Exp $");
41 #endif
42 #endif /* not lint && not SCCSID */
43
44 /*
45 * chared.c: Character editor utilities
46 */
47 #include <stdlib.h>
48 #include "el.h"
49
50 private void ch__clearmacro (EditLine *);
51
52 /* value to leave unused in line buffer */
53 #define EL_LEAVE 2
54
55 /* cv_undo():
56 * Handle state for the vi undo command
57 */
58 protected void
cv_undo(EditLine * el)59 cv_undo(EditLine *el)
60 {
61 c_undo_t *vu = &el->el_chared.c_undo;
62 c_redo_t *r = &el->el_chared.c_redo;
63 size_t size;
64
65 /* Save entire line for undo */
66 size = (size_t)(el->el_line.lastchar - el->el_line.buffer);
67 vu->len = (ssize_t)size;
68 vu->cursor = (int)(el->el_line.cursor - el->el_line.buffer);
69 (void)memcpy(vu->buf, el->el_line.buffer, size * sizeof(*vu->buf));
70
71 /* save command info for redo */
72 r->count = el->el_state.doingarg ? el->el_state.argument : 0;
73 r->action = el->el_chared.c_vcmd.action;
74 r->pos = r->buf;
75 r->cmd = el->el_state.thiscmd;
76 r->ch = el->el_state.thisch;
77 }
78
79 /* cv_yank():
80 * Save yank/delete data for paste
81 */
82 protected void
cv_yank(EditLine * el,const Char * ptr,int size)83 cv_yank(EditLine *el, const Char *ptr, int size)
84 {
85 c_kill_t *k = &el->el_chared.c_kill;
86
87 (void)memcpy(k->buf, ptr, (size_t)size * sizeof(*k->buf));
88 k->last = k->buf + size;
89 }
90
91
92 /* c_insert():
93 * Insert num characters
94 */
95 protected void
c_insert(EditLine * el,int num)96 c_insert(EditLine *el, int num)
97 {
98 Char *cp;
99
100 if (el->el_line.lastchar + num >= el->el_line.limit) {
101 if (!ch_enlargebufs(el, (size_t)num))
102 return; /* can't go past end of buffer */
103 }
104
105 if (el->el_line.cursor < el->el_line.lastchar) {
106 /* if I must move chars */
107 for (cp = el->el_line.lastchar; cp >= el->el_line.cursor; cp--)
108 cp[num] = *cp;
109 }
110 el->el_line.lastchar += num;
111 }
112
113
114 /* c_delafter():
115 * Delete num characters after the cursor
116 */
117 protected void
c_delafter(EditLine * el,int num)118 c_delafter(EditLine *el, int num)
119 {
120
121 if (el->el_line.cursor + num > el->el_line.lastchar)
122 num = (int)(el->el_line.lastchar - el->el_line.cursor);
123
124 if (el->el_map.current != el->el_map.emacs) {
125 cv_undo(el);
126 cv_yank(el, el->el_line.cursor, num);
127 }
128
129 if (num > 0) {
130 Char *cp;
131
132 for (cp = el->el_line.cursor; cp <= el->el_line.lastchar; cp++)
133 *cp = cp[num];
134
135 el->el_line.lastchar -= num;
136 }
137 }
138
139
140 /* c_delafter1():
141 * Delete the character after the cursor, do not yank
142 */
143 protected void
c_delafter1(EditLine * el)144 c_delafter1(EditLine *el)
145 {
146 Char *cp;
147
148 for (cp = el->el_line.cursor; cp <= el->el_line.lastchar; cp++)
149 *cp = cp[1];
150
151 el->el_line.lastchar--;
152 }
153
154
155 /* c_delbefore():
156 * Delete num characters before the cursor
157 */
158 protected void
c_delbefore(EditLine * el,int num)159 c_delbefore(EditLine *el, int num)
160 {
161
162 if (el->el_line.cursor - num < el->el_line.buffer)
163 num = (int)(el->el_line.cursor - el->el_line.buffer);
164
165 if (el->el_map.current != el->el_map.emacs) {
166 cv_undo(el);
167 cv_yank(el, el->el_line.cursor - num, num);
168 }
169
170 if (num > 0) {
171 Char *cp;
172
173 for (cp = el->el_line.cursor - num;
174 cp <= el->el_line.lastchar;
175 cp++)
176 *cp = cp[num];
177
178 el->el_line.lastchar -= num;
179 }
180 }
181
182
183 /* c_delbefore1():
184 * Delete the character before the cursor, do not yank
185 */
186 protected void
c_delbefore1(EditLine * el)187 c_delbefore1(EditLine *el)
188 {
189 Char *cp;
190
191 for (cp = el->el_line.cursor - 1; cp <= el->el_line.lastchar; cp++)
192 *cp = cp[1];
193
194 el->el_line.lastchar--;
195 }
196
197
198 /* ce__isword():
199 * Return if p is part of a word according to emacs
200 */
201 protected int
ce__isword(Int p)202 ce__isword(Int p)
203 {
204 return Isalnum(p) || Strchr(STR("*?_-.[]~="), p) != NULL;
205 }
206
207
208 /* cv__isword():
209 * Return if p is part of a word according to vi
210 */
211 protected int
cv__isword(Int p)212 cv__isword(Int p)
213 {
214 if (Isalnum(p) || p == '_')
215 return 1;
216 if (Isgraph(p))
217 return 2;
218 return 0;
219 }
220
221
222 /* cv__isWord():
223 * Return if p is part of a big word according to vi
224 */
225 protected int
cv__isWord(Int p)226 cv__isWord(Int p)
227 {
228 return !Isspace(p);
229 }
230
231
232 /* c__prev_word():
233 * Find the previous word
234 */
235 protected Char *
c__prev_word(Char * p,Char * low,int n,int (* wtest)(Int))236 c__prev_word(Char *p, Char *low, int n, int (*wtest)(Int))
237 {
238 p--;
239
240 while (n--) {
241 while ((p >= low) && !(*wtest)(*p))
242 p--;
243 while ((p >= low) && (*wtest)(*p))
244 p--;
245 }
246
247 /* cp now points to one character before the word */
248 p++;
249 if (p < low)
250 p = low;
251 /* cp now points where we want it */
252 return p;
253 }
254
255
256 /* c__next_word():
257 * Find the next word
258 */
259 protected Char *
c__next_word(Char * p,Char * high,int n,int (* wtest)(Int))260 c__next_word(Char *p, Char *high, int n, int (*wtest)(Int))
261 {
262 while (n--) {
263 while ((p < high) && !(*wtest)(*p))
264 p++;
265 while ((p < high) && (*wtest)(*p))
266 p++;
267 }
268 if (p > high)
269 p = high;
270 /* p now points where we want it */
271 return p;
272 }
273
274 /* cv_next_word():
275 * Find the next word vi style
276 */
277 protected Char *
cv_next_word(EditLine * el,Char * p,Char * high,int n,int (* wtest)(Int))278 cv_next_word(EditLine *el, Char *p, Char *high, int n, int (*wtest)(Int))
279 {
280 int test;
281
282 while (n--) {
283 test = (*wtest)(*p);
284 while ((p < high) && (*wtest)(*p) == test)
285 p++;
286 /*
287 * vi historically deletes with cw only the word preserving the
288 * trailing whitespace! This is not what 'w' does..
289 */
290 if (n || el->el_chared.c_vcmd.action != (DELETE|INSERT))
291 while ((p < high) && Isspace(*p))
292 p++;
293 }
294
295 /* p now points where we want it */
296 if (p > high)
297 return high;
298 else
299 return p;
300 }
301
302
303 /* cv_prev_word():
304 * Find the previous word vi style
305 */
306 protected Char *
cv_prev_word(Char * p,Char * low,int n,int (* wtest)(Int))307 cv_prev_word(Char *p, Char *low, int n, int (*wtest)(Int))
308 {
309 int test;
310
311 p--;
312 while (n--) {
313 while ((p > low) && Isspace(*p))
314 p--;
315 test = (*wtest)(*p);
316 while ((p >= low) && (*wtest)(*p) == test)
317 p--;
318 }
319 p++;
320
321 /* p now points where we want it */
322 if (p < low)
323 return low;
324 else
325 return p;
326 }
327
328
329 /* cv_delfini():
330 * Finish vi delete action
331 */
332 protected void
cv_delfini(EditLine * el)333 cv_delfini(EditLine *el)
334 {
335 int size;
336 int action = el->el_chared.c_vcmd.action;
337
338 if (action & INSERT)
339 el->el_map.current = el->el_map.key;
340
341 if (el->el_chared.c_vcmd.pos == 0)
342 /* sanity */
343 return;
344
345 size = (int)(el->el_line.cursor - el->el_chared.c_vcmd.pos);
346 if (size == 0)
347 size = 1;
348 el->el_line.cursor = el->el_chared.c_vcmd.pos;
349 if (action & YANK) {
350 if (size > 0)
351 cv_yank(el, el->el_line.cursor, size);
352 else
353 cv_yank(el, el->el_line.cursor + size, -size);
354 } else {
355 if (size > 0) {
356 c_delafter(el, size);
357 re_refresh_cursor(el);
358 } else {
359 c_delbefore(el, -size);
360 el->el_line.cursor += size;
361 }
362 }
363 el->el_chared.c_vcmd.action = NOP;
364 }
365
366
367 /* cv__endword():
368 * Go to the end of this word according to vi
369 */
370 protected Char *
cv__endword(Char * p,Char * high,int n,int (* wtest)(Int))371 cv__endword(Char *p, Char *high, int n, int (*wtest)(Int))
372 {
373 int test;
374
375 p++;
376
377 while (n--) {
378 while ((p < high) && Isspace(*p))
379 p++;
380
381 test = (*wtest)(*p);
382 while ((p < high) && (*wtest)(*p) == test)
383 p++;
384 }
385 p--;
386 return p;
387 }
388
389 /* ch_init():
390 * Initialize the character editor
391 */
392 protected int
ch_init(EditLine * el)393 ch_init(EditLine *el)
394 {
395 c_macro_t *ma = &el->el_chared.c_macro;
396
397 el->el_line.buffer = el_malloc(EL_BUFSIZ *
398 sizeof(*el->el_line.buffer));
399 if (el->el_line.buffer == NULL)
400 return -1;
401
402 (void) memset(el->el_line.buffer, 0, EL_BUFSIZ *
403 sizeof(*el->el_line.buffer));
404 el->el_line.cursor = el->el_line.buffer;
405 el->el_line.lastchar = el->el_line.buffer;
406 el->el_line.limit = &el->el_line.buffer[EL_BUFSIZ - EL_LEAVE];
407
408 el->el_chared.c_undo.buf = el_malloc(EL_BUFSIZ *
409 sizeof(*el->el_chared.c_undo.buf));
410 if (el->el_chared.c_undo.buf == NULL)
411 return -1;
412 (void) memset(el->el_chared.c_undo.buf, 0, EL_BUFSIZ *
413 sizeof(*el->el_chared.c_undo.buf));
414 el->el_chared.c_undo.len = -1;
415 el->el_chared.c_undo.cursor = 0;
416 el->el_chared.c_redo.buf = el_malloc(EL_BUFSIZ *
417 sizeof(*el->el_chared.c_redo.buf));
418 if (el->el_chared.c_redo.buf == NULL)
419 return -1;
420 el->el_chared.c_redo.pos = el->el_chared.c_redo.buf;
421 el->el_chared.c_redo.lim = el->el_chared.c_redo.buf + EL_BUFSIZ;
422 el->el_chared.c_redo.cmd = ED_UNASSIGNED;
423
424 el->el_chared.c_vcmd.action = NOP;
425 el->el_chared.c_vcmd.pos = el->el_line.buffer;
426
427 el->el_chared.c_kill.buf = el_malloc(EL_BUFSIZ *
428 sizeof(*el->el_chared.c_kill.buf));
429 if (el->el_chared.c_kill.buf == NULL)
430 return -1;
431 (void) memset(el->el_chared.c_kill.buf, 0, EL_BUFSIZ *
432 sizeof(*el->el_chared.c_kill.buf));
433 el->el_chared.c_kill.mark = el->el_line.buffer;
434 el->el_chared.c_kill.last = el->el_chared.c_kill.buf;
435 el->el_chared.c_resizefun = NULL;
436 el->el_chared.c_resizearg = NULL;
437 el->el_chared.c_aliasfun = NULL;
438 el->el_chared.c_aliasarg = NULL;
439
440 el->el_map.current = el->el_map.key;
441
442 el->el_state.inputmode = MODE_INSERT; /* XXX: save a default */
443 el->el_state.doingarg = 0;
444 el->el_state.metanext = 0;
445 el->el_state.argument = 1;
446 el->el_state.lastcmd = ED_UNASSIGNED;
447
448 ma->level = -1;
449 ma->offset = 0;
450 ma->macro = el_malloc(EL_MAXMACRO * sizeof(*ma->macro));
451 if (ma->macro == NULL)
452 return -1;
453 return 0;
454 }
455
456 /* ch_reset():
457 * Reset the character editor
458 */
459 protected void
ch_reset(EditLine * el,int mclear)460 ch_reset(EditLine *el, int mclear)
461 {
462 el->el_line.cursor = el->el_line.buffer;
463 el->el_line.lastchar = el->el_line.buffer;
464
465 el->el_chared.c_undo.len = -1;
466 el->el_chared.c_undo.cursor = 0;
467
468 el->el_chared.c_vcmd.action = NOP;
469 el->el_chared.c_vcmd.pos = el->el_line.buffer;
470
471 el->el_chared.c_kill.mark = el->el_line.buffer;
472
473 el->el_map.current = el->el_map.key;
474
475 el->el_state.inputmode = MODE_INSERT; /* XXX: save a default */
476 el->el_state.doingarg = 0;
477 el->el_state.metanext = 0;
478 el->el_state.argument = 1;
479 el->el_state.lastcmd = ED_UNASSIGNED;
480
481 el->el_history.eventno = 0;
482
483 if (mclear)
484 ch__clearmacro(el);
485 }
486
487 private void
ch__clearmacro(EditLine * el)488 ch__clearmacro(EditLine *el)
489 {
490 c_macro_t *ma = &el->el_chared.c_macro;
491 while (ma->level >= 0)
492 el_free(ma->macro[ma->level--]);
493 }
494
495 /* ch_enlargebufs():
496 * Enlarge line buffer to be able to hold twice as much characters.
497 * Returns 1 if successful, 0 if not.
498 */
499 protected int
ch_enlargebufs(EditLine * el,size_t addlen)500 ch_enlargebufs(EditLine *el, size_t addlen)
501 {
502 size_t sz, newsz;
503 Char *newbuffer, *oldbuf, *oldkbuf;
504
505 sz = (size_t)(el->el_line.limit - el->el_line.buffer + EL_LEAVE);
506 newsz = sz * 2;
507 /*
508 * If newly required length is longer than current buffer, we need
509 * to make the buffer big enough to hold both old and new stuff.
510 */
511 if (addlen > sz) {
512 while(newsz - sz < addlen)
513 newsz *= 2;
514 }
515
516 /*
517 * Reallocate line buffer.
518 */
519 newbuffer = el_realloc(el->el_line.buffer, newsz * sizeof(*newbuffer));
520 if (!newbuffer)
521 return 0;
522
523 /* zero the newly added memory, leave old data in */
524 (void) memset(&newbuffer[sz], 0, (newsz - sz) * sizeof(*newbuffer));
525
526 oldbuf = el->el_line.buffer;
527
528 el->el_line.buffer = newbuffer;
529 el->el_line.cursor = newbuffer + (el->el_line.cursor - oldbuf);
530 el->el_line.lastchar = newbuffer + (el->el_line.lastchar - oldbuf);
531 /* don't set new size until all buffers are enlarged */
532 el->el_line.limit = &newbuffer[sz - EL_LEAVE];
533
534 /*
535 * Reallocate kill buffer.
536 */
537 newbuffer = el_realloc(el->el_chared.c_kill.buf, newsz *
538 sizeof(*newbuffer));
539 if (!newbuffer)
540 return 0;
541
542 /* zero the newly added memory, leave old data in */
543 (void) memset(&newbuffer[sz], 0, (newsz - sz) * sizeof(*newbuffer));
544
545 oldkbuf = el->el_chared.c_kill.buf;
546
547 el->el_chared.c_kill.buf = newbuffer;
548 el->el_chared.c_kill.last = newbuffer +
549 (el->el_chared.c_kill.last - oldkbuf);
550 el->el_chared.c_kill.mark = el->el_line.buffer +
551 (el->el_chared.c_kill.mark - oldbuf);
552
553 /*
554 * Reallocate undo buffer.
555 */
556 newbuffer = el_realloc(el->el_chared.c_undo.buf,
557 newsz * sizeof(*newbuffer));
558 if (!newbuffer)
559 return 0;
560
561 /* zero the newly added memory, leave old data in */
562 (void) memset(&newbuffer[sz], 0, (newsz - sz) * sizeof(*newbuffer));
563 el->el_chared.c_undo.buf = newbuffer;
564
565 newbuffer = el_realloc(el->el_chared.c_redo.buf,
566 newsz * sizeof(*newbuffer));
567 if (!newbuffer)
568 return 0;
569 el->el_chared.c_redo.pos = newbuffer +
570 (el->el_chared.c_redo.pos - el->el_chared.c_redo.buf);
571 el->el_chared.c_redo.lim = newbuffer +
572 (el->el_chared.c_redo.lim - el->el_chared.c_redo.buf);
573 el->el_chared.c_redo.buf = newbuffer;
574
575 if (!hist_enlargebuf(el, sz, newsz))
576 return 0;
577
578 /* Safe to set enlarged buffer size */
579 el->el_line.limit = &el->el_line.buffer[newsz - EL_LEAVE];
580 if (el->el_chared.c_resizefun)
581 (*el->el_chared.c_resizefun)(el, el->el_chared.c_resizearg);
582 return 1;
583 }
584
585 /* ch_end():
586 * Free the data structures used by the editor
587 */
588 protected void
ch_end(EditLine * el)589 ch_end(EditLine *el)
590 {
591 el_free(el->el_line.buffer);
592 el->el_line.buffer = NULL;
593 el->el_line.limit = NULL;
594 el_free(el->el_chared.c_undo.buf);
595 el->el_chared.c_undo.buf = NULL;
596 el_free(el->el_chared.c_redo.buf);
597 el->el_chared.c_redo.buf = NULL;
598 el->el_chared.c_redo.pos = NULL;
599 el->el_chared.c_redo.lim = NULL;
600 el->el_chared.c_redo.cmd = ED_UNASSIGNED;
601 el_free(el->el_chared.c_kill.buf);
602 el->el_chared.c_kill.buf = NULL;
603 ch_reset(el, 1);
604 el_free(el->el_chared.c_macro.macro);
605 el->el_chared.c_macro.macro = NULL;
606 }
607
608
609 /* el_insertstr():
610 * Insert string at cursorI
611 */
612 public int
FUN(el,insertstr)613 FUN(el,insertstr)(EditLine *el, const Char *s)
614 {
615 size_t len;
616
617 if (s == NULL || (len = Strlen(s)) == 0)
618 return -1;
619 if (el->el_line.lastchar + len >= el->el_line.limit) {
620 if (!ch_enlargebufs(el, len))
621 return -1;
622 }
623
624 c_insert(el, (int)len);
625 while (*s)
626 *el->el_line.cursor++ = *s++;
627 return 0;
628 }
629
630
631 /* el_deletestr():
632 * Delete num characters before the cursor
633 */
634 public void
el_deletestr(EditLine * el,int n)635 el_deletestr(EditLine *el, int n)
636 {
637 if (n <= 0)
638 return;
639
640 if (el->el_line.cursor < &el->el_line.buffer[n])
641 return;
642
643 c_delbefore(el, n); /* delete before dot */
644 el->el_line.cursor -= n;
645 if (el->el_line.cursor < el->el_line.buffer)
646 el->el_line.cursor = el->el_line.buffer;
647 }
648
649 /* el_cursor():
650 * Move the cursor to the left or the right of the current position
651 */
652 public int
el_cursor(EditLine * el,int n)653 el_cursor(EditLine *el, int n)
654 {
655 if (n == 0)
656 goto out;
657
658 el->el_line.cursor += n;
659
660 if (el->el_line.cursor < el->el_line.buffer)
661 el->el_line.cursor = el->el_line.buffer;
662 if (el->el_line.cursor > el->el_line.lastchar)
663 el->el_line.cursor = el->el_line.lastchar;
664 out:
665 return (int)(el->el_line.cursor - el->el_line.buffer);
666 }
667
668 /* c_gets():
669 * Get a string
670 */
671 protected int
c_gets(EditLine * el,Char * buf,const Char * prompt)672 c_gets(EditLine *el, Char *buf, const Char *prompt)
673 {
674 Char ch;
675 ssize_t len;
676 Char *cp = el->el_line.buffer;
677
678 if (prompt) {
679 len = (ssize_t)Strlen(prompt);
680 (void)memcpy(cp, prompt, (size_t)len * sizeof(*cp));
681 cp += len;
682 }
683 len = 0;
684
685 for (;;) {
686 el->el_line.cursor = cp;
687 *cp = ' ';
688 el->el_line.lastchar = cp + 1;
689 re_refresh(el);
690
691 if (FUN(el,getc)(el, &ch) != 1) {
692 ed_end_of_file(el, 0);
693 len = -1;
694 break;
695 }
696
697 switch (ch) {
698
699 case 0010: /* Delete and backspace */
700 case 0177:
701 if (len == 0) {
702 len = -1;
703 break;
704 }
705 cp--;
706 continue;
707
708 case 0033: /* ESC */
709 case '\r': /* Newline */
710 case '\n':
711 buf[len] = ch;
712 break;
713
714 default:
715 if (len >= (ssize_t)(EL_BUFSIZ - 16))
716 terminal_beep(el);
717 else {
718 buf[len++] = ch;
719 *cp++ = ch;
720 }
721 continue;
722 }
723 break;
724 }
725
726 el->el_line.buffer[0] = '\0';
727 el->el_line.lastchar = el->el_line.buffer;
728 el->el_line.cursor = el->el_line.buffer;
729 return (int)len;
730 }
731
732
733 /* c_hpos():
734 * Return the current horizontal position of the cursor
735 */
736 protected int
c_hpos(EditLine * el)737 c_hpos(EditLine *el)
738 {
739 Char *ptr;
740
741 /*
742 * Find how many characters till the beginning of this line.
743 */
744 if (el->el_line.cursor == el->el_line.buffer)
745 return 0;
746 else {
747 for (ptr = el->el_line.cursor - 1;
748 ptr >= el->el_line.buffer && *ptr != '\n';
749 ptr--)
750 continue;
751 return (int)(el->el_line.cursor - ptr - 1);
752 }
753 }
754
755 protected int
ch_resizefun(EditLine * el,el_zfunc_t f,void * a)756 ch_resizefun(EditLine *el, el_zfunc_t f, void *a)
757 {
758 el->el_chared.c_resizefun = f;
759 el->el_chared.c_resizearg = a;
760 return 0;
761 }
762
763 protected int
ch_aliasfun(EditLine * el,el_afunc_t f,void * a)764 ch_aliasfun(EditLine *el, el_afunc_t f, void *a)
765 {
766 el->el_chared.c_aliasfun = f;
767 el->el_chared.c_aliasarg = a;
768 return 0;
769 }
770