1 /* $NetBSD: chared.c,v 1.36 2011/10/23 17:37:55 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 1.36 2011/10/23 17:37:55 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; 437 438 el->el_map.current = el->el_map.key; 439 440 el->el_state.inputmode = MODE_INSERT; /* XXX: save a default */ 441 el->el_state.doingarg = 0; 442 el->el_state.metanext = 0; 443 el->el_state.argument = 1; 444 el->el_state.lastcmd = ED_UNASSIGNED; 445 446 ma->level = -1; 447 ma->offset = 0; 448 ma->macro = el_malloc(EL_MAXMACRO * sizeof(*ma->macro)); 449 if (ma->macro == NULL) 450 return -1; 451 return 0; 452 } 453 454 /* ch_reset(): 455 * Reset the character editor 456 */ 457 protected void 458 ch_reset(EditLine *el, int mclear) 459 { 460 el->el_line.cursor = el->el_line.buffer; 461 el->el_line.lastchar = el->el_line.buffer; 462 463 el->el_chared.c_undo.len = -1; 464 el->el_chared.c_undo.cursor = 0; 465 466 el->el_chared.c_vcmd.action = NOP; 467 el->el_chared.c_vcmd.pos = el->el_line.buffer; 468 469 el->el_chared.c_kill.mark = el->el_line.buffer; 470 471 el->el_map.current = el->el_map.key; 472 473 el->el_state.inputmode = MODE_INSERT; /* XXX: save a default */ 474 el->el_state.doingarg = 0; 475 el->el_state.metanext = 0; 476 el->el_state.argument = 1; 477 el->el_state.lastcmd = ED_UNASSIGNED; 478 479 el->el_history.eventno = 0; 480 481 if (mclear) 482 ch__clearmacro(el); 483 } 484 485 private void 486 ch__clearmacro(EditLine *el) 487 { 488 c_macro_t *ma = &el->el_chared.c_macro; 489 while (ma->level >= 0) 490 el_free(ma->macro[ma->level--]); 491 } 492 493 /* ch_enlargebufs(): 494 * Enlarge line buffer to be able to hold twice as much characters. 495 * Returns 1 if successful, 0 if not. 496 */ 497 protected int 498 ch_enlargebufs(EditLine *el, size_t addlen) 499 { 500 size_t sz, newsz; 501 Char *newbuffer, *oldbuf, *oldkbuf; 502 503 sz = (size_t)(el->el_line.limit - el->el_line.buffer + EL_LEAVE); 504 newsz = sz * 2; 505 /* 506 * If newly required length is longer than current buffer, we need 507 * to make the buffer big enough to hold both old and new stuff. 508 */ 509 if (addlen > sz) { 510 while(newsz - sz < addlen) 511 newsz *= 2; 512 } 513 514 /* 515 * Reallocate line buffer. 516 */ 517 newbuffer = el_realloc(el->el_line.buffer, newsz * sizeof(*newbuffer)); 518 if (!newbuffer) 519 return 0; 520 521 /* zero the newly added memory, leave old data in */ 522 (void) memset(&newbuffer[sz], 0, (newsz - sz) * sizeof(*newbuffer)); 523 524 oldbuf = el->el_line.buffer; 525 526 el->el_line.buffer = newbuffer; 527 el->el_line.cursor = newbuffer + (el->el_line.cursor - oldbuf); 528 el->el_line.lastchar = newbuffer + (el->el_line.lastchar - oldbuf); 529 /* don't set new size until all buffers are enlarged */ 530 el->el_line.limit = &newbuffer[sz - EL_LEAVE]; 531 532 /* 533 * Reallocate kill buffer. 534 */ 535 newbuffer = el_realloc(el->el_chared.c_kill.buf, newsz * 536 sizeof(*newbuffer)); 537 if (!newbuffer) 538 return 0; 539 540 /* zero the newly added memory, leave old data in */ 541 (void) memset(&newbuffer[sz], 0, (newsz - sz) * sizeof(*newbuffer)); 542 543 oldkbuf = el->el_chared.c_kill.buf; 544 545 el->el_chared.c_kill.buf = newbuffer; 546 el->el_chared.c_kill.last = newbuffer + 547 (el->el_chared.c_kill.last - oldkbuf); 548 el->el_chared.c_kill.mark = el->el_line.buffer + 549 (el->el_chared.c_kill.mark - oldbuf); 550 551 /* 552 * Reallocate undo buffer. 553 */ 554 newbuffer = el_realloc(el->el_chared.c_undo.buf, 555 newsz * sizeof(*newbuffer)); 556 if (!newbuffer) 557 return 0; 558 559 /* zero the newly added memory, leave old data in */ 560 (void) memset(&newbuffer[sz], 0, (newsz - sz) * sizeof(*newbuffer)); 561 el->el_chared.c_undo.buf = newbuffer; 562 563 newbuffer = el_realloc(el->el_chared.c_redo.buf, 564 newsz * sizeof(*newbuffer)); 565 if (!newbuffer) 566 return 0; 567 el->el_chared.c_redo.pos = newbuffer + 568 (el->el_chared.c_redo.pos - el->el_chared.c_redo.buf); 569 el->el_chared.c_redo.lim = newbuffer + 570 (el->el_chared.c_redo.lim - el->el_chared.c_redo.buf); 571 el->el_chared.c_redo.buf = newbuffer; 572 573 if (!hist_enlargebuf(el, sz, newsz)) 574 return 0; 575 576 /* Safe to set enlarged buffer size */ 577 el->el_line.limit = &el->el_line.buffer[newsz - EL_LEAVE]; 578 if (el->el_chared.c_resizefun) 579 (*el->el_chared.c_resizefun)(el, el->el_chared.c_resizearg); 580 return 1; 581 } 582 583 /* ch_end(): 584 * Free the data structures used by the editor 585 */ 586 protected void 587 ch_end(EditLine *el) 588 { 589 el_free(el->el_line.buffer); 590 el->el_line.buffer = NULL; 591 el->el_line.limit = NULL; 592 el_free(el->el_chared.c_undo.buf); 593 el->el_chared.c_undo.buf = NULL; 594 el_free(el->el_chared.c_redo.buf); 595 el->el_chared.c_redo.buf = NULL; 596 el->el_chared.c_redo.pos = NULL; 597 el->el_chared.c_redo.lim = NULL; 598 el->el_chared.c_redo.cmd = ED_UNASSIGNED; 599 el_free(el->el_chared.c_kill.buf); 600 el->el_chared.c_kill.buf = NULL; 601 ch_reset(el, 1); 602 el_free(el->el_chared.c_macro.macro); 603 el->el_chared.c_macro.macro = NULL; 604 } 605 606 607 /* el_insertstr(): 608 * Insert string at cursorI 609 */ 610 public int 611 FUN(el,insertstr)(EditLine *el, const Char *s) 612 { 613 size_t len; 614 615 if ((len = Strlen(s)) == 0) 616 return -1; 617 if (el->el_line.lastchar + len >= el->el_line.limit) { 618 if (!ch_enlargebufs(el, len)) 619 return -1; 620 } 621 622 c_insert(el, (int)len); 623 while (*s) 624 *el->el_line.cursor++ = *s++; 625 return 0; 626 } 627 628 629 /* el_deletestr(): 630 * Delete num characters before the cursor 631 */ 632 public void 633 el_deletestr(EditLine *el, int n) 634 { 635 if (n <= 0) 636 return; 637 638 if (el->el_line.cursor < &el->el_line.buffer[n]) 639 return; 640 641 c_delbefore(el, n); /* delete before dot */ 642 el->el_line.cursor -= n; 643 if (el->el_line.cursor < el->el_line.buffer) 644 el->el_line.cursor = el->el_line.buffer; 645 } 646 647 /* c_gets(): 648 * Get a string 649 */ 650 protected int 651 c_gets(EditLine *el, Char *buf, const Char *prompt) 652 { 653 Char ch; 654 ssize_t len; 655 Char *cp = el->el_line.buffer; 656 657 if (prompt) { 658 len = (ssize_t)Strlen(prompt); 659 (void)memcpy(cp, prompt, (size_t)len * sizeof(*cp)); 660 cp += len; 661 } 662 len = 0; 663 664 for (;;) { 665 el->el_line.cursor = cp; 666 *cp = ' '; 667 el->el_line.lastchar = cp + 1; 668 re_refresh(el); 669 670 if (FUN(el,getc)(el, &ch) != 1) { 671 ed_end_of_file(el, 0); 672 len = -1; 673 break; 674 } 675 676 switch (ch) { 677 678 case 0010: /* Delete and backspace */ 679 case 0177: 680 if (len == 0) { 681 len = -1; 682 break; 683 } 684 cp--; 685 continue; 686 687 case 0033: /* ESC */ 688 case '\r': /* Newline */ 689 case '\n': 690 buf[len] = ch; 691 break; 692 693 default: 694 if (len >= (ssize_t)(EL_BUFSIZ - 16)) 695 terminal_beep(el); 696 else { 697 buf[len++] = ch; 698 *cp++ = ch; 699 } 700 continue; 701 } 702 break; 703 } 704 705 el->el_line.buffer[0] = '\0'; 706 el->el_line.lastchar = el->el_line.buffer; 707 el->el_line.cursor = el->el_line.buffer; 708 return (int)len; 709 } 710 711 712 /* c_hpos(): 713 * Return the current horizontal position of the cursor 714 */ 715 protected int 716 c_hpos(EditLine *el) 717 { 718 Char *ptr; 719 720 /* 721 * Find how many characters till the beginning of this line. 722 */ 723 if (el->el_line.cursor == el->el_line.buffer) 724 return 0; 725 else { 726 for (ptr = el->el_line.cursor - 1; 727 ptr >= el->el_line.buffer && *ptr != '\n'; 728 ptr--) 729 continue; 730 return (int)(el->el_line.cursor - ptr - 1); 731 } 732 } 733 734 protected int 735 ch_resizefun(EditLine *el, el_zfunc_t f, void *a) 736 { 737 el->el_chared.c_resizefun = f; 738 el->el_chared.c_resizearg = a; 739 return 0; 740 } 741