lib/libedit/chared.c

   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
  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
  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
  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
 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
 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
 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
 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
 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
 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
 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 *
 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 *
 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 *
 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 *
 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
 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 *
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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 }