1 /* $NetBSD: chared.c,v 1.59 2019/07/23 10:18:52 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 1.59 2019/07/23 10:18:52 christos Exp $"); 41 #endif 42 #endif /* not lint && not SCCSID */ 43 44 /* 45 * chared.c: Character editor utilities 46 */ 47 #include <ctype.h> 48 #include <stdlib.h> 49 #include <string.h> 50 51 #include "el.h" 52 #include "common.h" 53 #include "fcns.h" 54 55 /* value to leave unused in line buffer */ 56 #define EL_LEAVE 2 57 58 /* cv_undo(): 59 * Handle state for the vi undo command 60 */ 61 libedit_private void 62 cv_undo(EditLine *el) 63 { 64 c_undo_t *vu = &el->el_chared.c_undo; 65 c_redo_t *r = &el->el_chared.c_redo; 66 size_t size; 67 68 /* Save entire line for undo */ 69 size = (size_t)(el->el_line.lastchar - el->el_line.buffer); 70 vu->len = (ssize_t)size; 71 vu->cursor = (int)(el->el_line.cursor - el->el_line.buffer); 72 (void)memcpy(vu->buf, el->el_line.buffer, size * sizeof(*vu->buf)); 73 74 /* save command info for redo */ 75 r->count = el->el_state.doingarg ? el->el_state.argument : 0; 76 r->action = el->el_chared.c_vcmd.action; 77 r->pos = r->buf; 78 r->cmd = el->el_state.thiscmd; 79 r->ch = el->el_state.thisch; 80 } 81 82 /* cv_yank(): 83 * Save yank/delete data for paste 84 */ 85 libedit_private void 86 cv_yank(EditLine *el, const wchar_t *ptr, int size) 87 { 88 c_kill_t *k = &el->el_chared.c_kill; 89 90 (void)memcpy(k->buf, ptr, (size_t)size * sizeof(*k->buf)); 91 k->last = k->buf + size; 92 } 93 94 95 /* c_insert(): 96 * Insert num characters 97 */ 98 libedit_private void 99 c_insert(EditLine *el, int num) 100 { 101 wchar_t *cp; 102 103 if (el->el_line.lastchar + num >= el->el_line.limit) { 104 if (!ch_enlargebufs(el, (size_t)num)) 105 return; /* can't go past end of buffer */ 106 } 107 108 if (el->el_line.cursor < el->el_line.lastchar) { 109 /* if I must move chars */ 110 for (cp = el->el_line.lastchar; cp >= el->el_line.cursor; cp--) 111 cp[num] = *cp; 112 } 113 el->el_line.lastchar += num; 114 } 115 116 117 /* c_delafter(): 118 * Delete num characters after the cursor 119 */ 120 libedit_private void 121 c_delafter(EditLine *el, int num) 122 { 123 124 if (el->el_line.cursor + num > el->el_line.lastchar) 125 num = (int)(el->el_line.lastchar - el->el_line.cursor); 126 127 if (el->el_map.current != el->el_map.emacs) { 128 cv_undo(el); 129 cv_yank(el, el->el_line.cursor, num); 130 } 131 132 if (num > 0) { 133 wchar_t *cp; 134 135 for (cp = el->el_line.cursor; cp <= el->el_line.lastchar; cp++) 136 *cp = cp[num]; 137 138 el->el_line.lastchar -= num; 139 } 140 } 141 142 143 /* c_delafter1(): 144 * Delete the character after the cursor, do not yank 145 */ 146 libedit_private void 147 c_delafter1(EditLine *el) 148 { 149 wchar_t *cp; 150 151 for (cp = el->el_line.cursor; cp <= el->el_line.lastchar; cp++) 152 *cp = cp[1]; 153 154 el->el_line.lastchar--; 155 } 156 157 158 /* c_delbefore(): 159 * Delete num characters before the cursor 160 */ 161 libedit_private void 162 c_delbefore(EditLine *el, int num) 163 { 164 165 if (el->el_line.cursor - num < el->el_line.buffer) 166 num = (int)(el->el_line.cursor - el->el_line.buffer); 167 168 if (el->el_map.current != el->el_map.emacs) { 169 cv_undo(el); 170 cv_yank(el, el->el_line.cursor - num, num); 171 } 172 173 if (num > 0) { 174 wchar_t *cp; 175 176 for (cp = el->el_line.cursor - num; 177 &cp[num] <= el->el_line.lastchar; 178 cp++) 179 *cp = cp[num]; 180 181 el->el_line.lastchar -= num; 182 } 183 } 184 185 186 /* c_delbefore1(): 187 * Delete the character before the cursor, do not yank 188 */ 189 libedit_private void 190 c_delbefore1(EditLine *el) 191 { 192 wchar_t *cp; 193 194 for (cp = el->el_line.cursor - 1; cp <= el->el_line.lastchar; cp++) 195 *cp = cp[1]; 196 197 el->el_line.lastchar--; 198 } 199 200 201 /* ce__isword(): 202 * Return if p is part of a word according to emacs 203 */ 204 libedit_private int 205 ce__isword(wint_t p) 206 { 207 return iswalnum(p) || wcschr(L"*?_-.[]~=", p) != NULL; 208 } 209 210 211 /* cv__isword(): 212 * Return if p is part of a word according to vi 213 */ 214 libedit_private int 215 cv__isword(wint_t p) 216 { 217 if (iswalnum(p) || p == L'_') 218 return 1; 219 if (iswgraph(p)) 220 return 2; 221 return 0; 222 } 223 224 225 /* cv__isWord(): 226 * Return if p is part of a big word according to vi 227 */ 228 libedit_private int 229 cv__isWord(wint_t p) 230 { 231 return !iswspace(p); 232 } 233 234 235 /* c__prev_word(): 236 * Find the previous word 237 */ 238 libedit_private wchar_t * 239 c__prev_word(wchar_t *p, wchar_t *low, int n, int (*wtest)(wint_t)) 240 { 241 p--; 242 243 while (n--) { 244 while ((p >= low) && !(*wtest)(*p)) 245 p--; 246 while ((p >= low) && (*wtest)(*p)) 247 p--; 248 } 249 250 /* cp now points to one character before the word */ 251 p++; 252 if (p < low) 253 p = low; 254 /* cp now points where we want it */ 255 return p; 256 } 257 258 259 /* c__next_word(): 260 * Find the next word 261 */ 262 libedit_private wchar_t * 263 c__next_word(wchar_t *p, wchar_t *high, int n, int (*wtest)(wint_t)) 264 { 265 while (n--) { 266 while ((p < high) && !(*wtest)(*p)) 267 p++; 268 while ((p < high) && (*wtest)(*p)) 269 p++; 270 } 271 if (p > high) 272 p = high; 273 /* p now points where we want it */ 274 return p; 275 } 276 277 /* cv_next_word(): 278 * Find the next word vi style 279 */ 280 libedit_private wchar_t * 281 cv_next_word(EditLine *el, wchar_t *p, wchar_t *high, int n, 282 int (*wtest)(wint_t)) 283 { 284 int test; 285 286 while (n--) { 287 test = (*wtest)(*p); 288 while ((p < high) && (*wtest)(*p) == test) 289 p++; 290 /* 291 * vi historically deletes with cw only the word preserving the 292 * trailing whitespace! This is not what 'w' does.. 293 */ 294 if (n || el->el_chared.c_vcmd.action != (DELETE|INSERT)) 295 while ((p < high) && iswspace(*p)) 296 p++; 297 } 298 299 /* p now points where we want it */ 300 if (p > high) 301 return high; 302 else 303 return p; 304 } 305 306 307 /* cv_prev_word(): 308 * Find the previous word vi style 309 */ 310 libedit_private wchar_t * 311 cv_prev_word(wchar_t *p, wchar_t *low, int n, int (*wtest)(wint_t)) 312 { 313 int test; 314 315 p--; 316 while (n--) { 317 while ((p > low) && iswspace(*p)) 318 p--; 319 test = (*wtest)(*p); 320 while ((p >= low) && (*wtest)(*p) == test) 321 p--; 322 } 323 p++; 324 325 /* p now points where we want it */ 326 if (p < low) 327 return low; 328 else 329 return p; 330 } 331 332 333 /* cv_delfini(): 334 * Finish vi delete action 335 */ 336 libedit_private void 337 cv_delfini(EditLine *el) 338 { 339 int size; 340 int action = el->el_chared.c_vcmd.action; 341 342 if (action & INSERT) 343 el->el_map.current = el->el_map.key; 344 345 if (el->el_chared.c_vcmd.pos == 0) 346 /* sanity */ 347 return; 348 349 size = (int)(el->el_line.cursor - el->el_chared.c_vcmd.pos); 350 if (size == 0) 351 size = 1; 352 el->el_line.cursor = el->el_chared.c_vcmd.pos; 353 if (action & YANK) { 354 if (size > 0) 355 cv_yank(el, el->el_line.cursor, size); 356 else 357 cv_yank(el, el->el_line.cursor + size, -size); 358 } else { 359 if (size > 0) { 360 c_delafter(el, size); 361 re_refresh_cursor(el); 362 } else { 363 c_delbefore(el, -size); 364 el->el_line.cursor += size; 365 } 366 } 367 el->el_chared.c_vcmd.action = NOP; 368 } 369 370 371 /* cv__endword(): 372 * Go to the end of this word according to vi 373 */ 374 libedit_private wchar_t * 375 cv__endword(wchar_t *p, wchar_t *high, int n, int (*wtest)(wint_t)) 376 { 377 int test; 378 379 p++; 380 381 while (n--) { 382 while ((p < high) && iswspace(*p)) 383 p++; 384 385 test = (*wtest)(*p); 386 while ((p < high) && (*wtest)(*p) == test) 387 p++; 388 } 389 p--; 390 return p; 391 } 392 393 /* ch_init(): 394 * Initialize the character editor 395 */ 396 libedit_private int 397 ch_init(EditLine *el) 398 { 399 el->el_line.buffer = el_calloc(EL_BUFSIZ, 400 sizeof(*el->el_line.buffer)); 401 if (el->el_line.buffer == NULL) 402 return -1; 403 404 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_calloc(EL_BUFSIZ, 409 sizeof(*el->el_chared.c_undo.buf)); 410 if (el->el_chared.c_undo.buf == NULL) 411 return -1; 412 el->el_chared.c_undo.len = -1; 413 el->el_chared.c_undo.cursor = 0; 414 el->el_chared.c_redo.buf = el_calloc(EL_BUFSIZ, 415 sizeof(*el->el_chared.c_redo.buf)); 416 if (el->el_chared.c_redo.buf == NULL) 417 return -1; 418 el->el_chared.c_redo.pos = el->el_chared.c_redo.buf; 419 el->el_chared.c_redo.lim = el->el_chared.c_redo.buf + EL_BUFSIZ; 420 el->el_chared.c_redo.cmd = ED_UNASSIGNED; 421 422 el->el_chared.c_vcmd.action = NOP; 423 el->el_chared.c_vcmd.pos = el->el_line.buffer; 424 425 el->el_chared.c_kill.buf = el_calloc(EL_BUFSIZ, 426 sizeof(*el->el_chared.c_kill.buf)); 427 if (el->el_chared.c_kill.buf == NULL) 428 return -1; 429 el->el_chared.c_kill.mark = el->el_line.buffer; 430 el->el_chared.c_kill.last = el->el_chared.c_kill.buf; 431 el->el_chared.c_resizefun = NULL; 432 el->el_chared.c_resizearg = NULL; 433 el->el_chared.c_aliasfun = NULL; 434 el->el_chared.c_aliasarg = NULL; 435 436 el->el_map.current = el->el_map.key; 437 438 el->el_state.inputmode = MODE_INSERT; /* XXX: save a default */ 439 el->el_state.doingarg = 0; 440 el->el_state.metanext = 0; 441 el->el_state.argument = 1; 442 el->el_state.lastcmd = ED_UNASSIGNED; 443 444 return 0; 445 } 446 447 /* ch_reset(): 448 * Reset the character editor 449 */ 450 libedit_private void 451 ch_reset(EditLine *el) 452 { 453 el->el_line.cursor = el->el_line.buffer; 454 el->el_line.lastchar = el->el_line.buffer; 455 456 el->el_chared.c_undo.len = -1; 457 el->el_chared.c_undo.cursor = 0; 458 459 el->el_chared.c_vcmd.action = NOP; 460 el->el_chared.c_vcmd.pos = el->el_line.buffer; 461 462 el->el_chared.c_kill.mark = el->el_line.buffer; 463 464 el->el_map.current = el->el_map.key; 465 466 el->el_state.inputmode = MODE_INSERT; /* XXX: save a default */ 467 el->el_state.doingarg = 0; 468 el->el_state.metanext = 0; 469 el->el_state.argument = 1; 470 el->el_state.lastcmd = ED_UNASSIGNED; 471 472 el->el_history.eventno = 0; 473 } 474 475 /* ch_enlargebufs(): 476 * Enlarge line buffer to be able to hold twice as much characters. 477 * Returns 1 if successful, 0 if not. 478 */ 479 libedit_private int 480 ch_enlargebufs(EditLine *el, size_t addlen) 481 { 482 size_t sz, newsz; 483 wchar_t *newbuffer, *oldbuf, *oldkbuf; 484 485 sz = (size_t)(el->el_line.limit - el->el_line.buffer + EL_LEAVE); 486 newsz = sz * 2; 487 /* 488 * If newly required length is longer than current buffer, we need 489 * to make the buffer big enough to hold both old and new stuff. 490 */ 491 if (addlen > sz) { 492 while(newsz - sz < addlen) 493 newsz *= 2; 494 } 495 496 /* 497 * Reallocate line buffer. 498 */ 499 newbuffer = el_realloc(el->el_line.buffer, newsz * sizeof(*newbuffer)); 500 if (!newbuffer) 501 return 0; 502 503 /* zero the newly added memory, leave old data in */ 504 (void) memset(&newbuffer[sz], 0, (newsz - sz) * sizeof(*newbuffer)); 505 506 oldbuf = el->el_line.buffer; 507 508 el->el_line.buffer = newbuffer; 509 el->el_line.cursor = newbuffer + (el->el_line.cursor - oldbuf); 510 el->el_line.lastchar = newbuffer + (el->el_line.lastchar - oldbuf); 511 /* don't set new size until all buffers are enlarged */ 512 el->el_line.limit = &newbuffer[sz - EL_LEAVE]; 513 514 /* 515 * Reallocate kill buffer. 516 */ 517 newbuffer = el_realloc(el->el_chared.c_kill.buf, newsz * 518 sizeof(*newbuffer)); 519 if (!newbuffer) 520 return 0; 521 522 /* zero the newly added memory, leave old data in */ 523 (void) memset(&newbuffer[sz], 0, (newsz - sz) * sizeof(*newbuffer)); 524 525 oldkbuf = el->el_chared.c_kill.buf; 526 527 el->el_chared.c_kill.buf = newbuffer; 528 el->el_chared.c_kill.last = newbuffer + 529 (el->el_chared.c_kill.last - oldkbuf); 530 el->el_chared.c_kill.mark = el->el_line.buffer + 531 (el->el_chared.c_kill.mark - oldbuf); 532 533 /* 534 * Reallocate undo buffer. 535 */ 536 newbuffer = el_realloc(el->el_chared.c_undo.buf, 537 newsz * sizeof(*newbuffer)); 538 if (!newbuffer) 539 return 0; 540 541 /* zero the newly added memory, leave old data in */ 542 (void) memset(&newbuffer[sz], 0, (newsz - sz) * sizeof(*newbuffer)); 543 el->el_chared.c_undo.buf = newbuffer; 544 545 newbuffer = el_realloc(el->el_chared.c_redo.buf, 546 newsz * sizeof(*newbuffer)); 547 if (!newbuffer) 548 return 0; 549 el->el_chared.c_redo.pos = newbuffer + 550 (el->el_chared.c_redo.pos - el->el_chared.c_redo.buf); 551 el->el_chared.c_redo.lim = newbuffer + 552 (el->el_chared.c_redo.lim - el->el_chared.c_redo.buf); 553 el->el_chared.c_redo.buf = newbuffer; 554 555 if (!hist_enlargebuf(el, sz, newsz)) 556 return 0; 557 558 /* Safe to set enlarged buffer size */ 559 el->el_line.limit = &el->el_line.buffer[newsz - EL_LEAVE]; 560 if (el->el_chared.c_resizefun) 561 (*el->el_chared.c_resizefun)(el, el->el_chared.c_resizearg); 562 return 1; 563 } 564 565 /* ch_end(): 566 * Free the data structures used by the editor 567 */ 568 libedit_private void 569 ch_end(EditLine *el) 570 { 571 el_free(el->el_line.buffer); 572 el->el_line.buffer = NULL; 573 el->el_line.limit = NULL; 574 el_free(el->el_chared.c_undo.buf); 575 el->el_chared.c_undo.buf = NULL; 576 el_free(el->el_chared.c_redo.buf); 577 el->el_chared.c_redo.buf = NULL; 578 el->el_chared.c_redo.pos = NULL; 579 el->el_chared.c_redo.lim = NULL; 580 el->el_chared.c_redo.cmd = ED_UNASSIGNED; 581 el_free(el->el_chared.c_kill.buf); 582 el->el_chared.c_kill.buf = NULL; 583 ch_reset(el); 584 } 585 586 587 /* el_insertstr(): 588 * Insert string at cursor 589 */ 590 int 591 el_winsertstr(EditLine *el, const wchar_t *s) 592 { 593 size_t len; 594 595 if (s == NULL || (len = wcslen(s)) == 0) 596 return -1; 597 if (el->el_line.lastchar + len >= el->el_line.limit) { 598 if (!ch_enlargebufs(el, len)) 599 return -1; 600 } 601 602 c_insert(el, (int)len); 603 while (*s) 604 *el->el_line.cursor++ = *s++; 605 return 0; 606 } 607 608 609 /* el_deletestr(): 610 * Delete num characters before the cursor 611 */ 612 void 613 el_deletestr(EditLine *el, int n) 614 { 615 if (n <= 0) 616 return; 617 618 if (el->el_line.cursor < &el->el_line.buffer[n]) 619 return; 620 621 c_delbefore(el, n); /* delete before dot */ 622 el->el_line.cursor -= n; 623 if (el->el_line.cursor < el->el_line.buffer) 624 el->el_line.cursor = el->el_line.buffer; 625 } 626 627 /* el_cursor(): 628 * Move the cursor to the left or the right of the current position 629 */ 630 int 631 el_cursor(EditLine *el, int n) 632 { 633 if (n == 0) 634 goto out; 635 636 el->el_line.cursor += n; 637 638 if (el->el_line.cursor < el->el_line.buffer) 639 el->el_line.cursor = el->el_line.buffer; 640 if (el->el_line.cursor > el->el_line.lastchar) 641 el->el_line.cursor = el->el_line.lastchar; 642 out: 643 return (int)(el->el_line.cursor - el->el_line.buffer); 644 } 645 646 /* c_gets(): 647 * Get a string 648 */ 649 libedit_private int 650 c_gets(EditLine *el, wchar_t *buf, const wchar_t *prompt) 651 { 652 ssize_t len; 653 wchar_t *cp = el->el_line.buffer, ch; 654 655 if (prompt) { 656 len = (ssize_t)wcslen(prompt); 657 (void)memcpy(cp, prompt, (size_t)len * sizeof(*cp)); 658 cp += len; 659 } 660 len = 0; 661 662 for (;;) { 663 el->el_line.cursor = cp; 664 *cp = ' '; 665 el->el_line.lastchar = cp + 1; 666 re_refresh(el); 667 668 if (el_wgetc(el, &ch) != 1) { 669 ed_end_of_file(el, 0); 670 len = -1; 671 break; 672 } 673 674 switch (ch) { 675 676 case L'\b': /* Delete and backspace */ 677 case 0177: 678 if (len == 0) { 679 len = -1; 680 break; 681 } 682 len--; 683 cp--; 684 continue; 685 686 case 0033: /* ESC */ 687 case L'\r': /* Newline */ 688 case L'\n': 689 buf[len] = ch; 690 break; 691 692 default: 693 if (len >= (ssize_t)(EL_BUFSIZ - 16)) 694 terminal_beep(el); 695 else { 696 buf[len++] = ch; 697 *cp++ = ch; 698 } 699 continue; 700 } 701 break; 702 } 703 704 el->el_line.buffer[0] = '\0'; 705 el->el_line.lastchar = el->el_line.buffer; 706 el->el_line.cursor = el->el_line.buffer; 707 return (int)len; 708 } 709 710 711 /* c_hpos(): 712 * Return the current horizontal position of the cursor 713 */ 714 libedit_private int 715 c_hpos(EditLine *el) 716 { 717 wchar_t *ptr; 718 719 /* 720 * Find how many characters till the beginning of this line. 721 */ 722 if (el->el_line.cursor == el->el_line.buffer) 723 return 0; 724 else { 725 for (ptr = el->el_line.cursor - 1; 726 ptr >= el->el_line.buffer && *ptr != '\n'; 727 ptr--) 728 continue; 729 return (int)(el->el_line.cursor - ptr - 1); 730 } 731 } 732 733 libedit_private int 734 ch_resizefun(EditLine *el, el_zfunc_t f, void *a) 735 { 736 el->el_chared.c_resizefun = f; 737 el->el_chared.c_resizearg = a; 738 return 0; 739 } 740 741 libedit_private int 742 ch_aliasfun(EditLine *el, el_afunc_t f, void *a) 743 { 744 el->el_chared.c_aliasfun = f; 745 el->el_chared.c_aliasarg = a; 746 return 0; 747 } 748