display.c revision 119614
1/* $FreeBSD: head/contrib/libreadline/display.c 119614 2003-08-31 18:29:38Z ache $ */ 2/* display.c -- readline redisplay facility. */ 3 4/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. 5 6 This file is part of the GNU Readline Library, a library for 7 reading lines of text with interactive input and history editing. 8 9 The GNU Readline Library is free software; you can redistribute it 10 and/or modify it under the terms of the GNU General Public License 11 as published by the Free Software Foundation; either version 2, or 12 (at your option) any later version. 13 14 The GNU Readline Library is distributed in the hope that it will be 15 useful, but WITHOUT ANY WARRANTY; without even the implied warranty 16 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 The GNU General Public License is often shipped with GNU software, and 20 is generally kept in a file called COPYING or LICENSE. If you do not 21 have a copy of the license, write to the Free Software Foundation, 22 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ 23#define READLINE_LIBRARY 24 25#if defined (HAVE_CONFIG_H) 26# include <config.h> 27#endif 28 29#include <sys/types.h> 30 31#if defined (HAVE_UNISTD_H) 32# include <unistd.h> 33#endif /* HAVE_UNISTD_H */ 34 35#include "posixstat.h" 36 37#if defined (HAVE_STDLIB_H) 38# include <stdlib.h> 39#else 40# include "ansi_stdlib.h" 41#endif /* HAVE_STDLIB_H */ 42 43#include <stdio.h> 44 45/* System-specific feature definitions and include files. */ 46#include "rldefs.h" 47#include "rlmbutil.h" 48 49/* Termcap library stuff. */ 50#include "tcap.h" 51 52/* Some standard library routines. */ 53#include "readline.h" 54#include "history.h" 55 56#include "rlprivate.h" 57#include "xmalloc.h" 58 59#if !defined (strchr) && !defined (__STDC__) 60extern char *strchr (), *strrchr (); 61#endif /* !strchr && !__STDC__ */ 62 63#if defined (HACK_TERMCAP_MOTION) 64extern char *_rl_term_forward_char; 65#endif 66 67static void update_line PARAMS((char *, char *, int, int, int, int)); 68static void space_to_eol PARAMS((int)); 69static void delete_chars PARAMS((int)); 70static void insert_some_chars PARAMS((char *, int, int)); 71static void cr PARAMS((void)); 72 73#if defined (HANDLE_MULTIBYTE) 74static int _rl_col_width PARAMS((char *, int, int)); 75static int *_rl_wrapped_line; 76#else 77# define _rl_col_width(l, s, e) (((e) <= (s)) ? 0 : (e) - (s)) 78#endif 79 80static int *inv_lbreaks, *vis_lbreaks; 81static int inv_lbsize, vis_lbsize; 82 83/* Heuristic used to decide whether it is faster to move from CUR to NEW 84 by backing up or outputting a carriage return and moving forward. */ 85#define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new))) 86 87/* **************************************************************** */ 88/* */ 89/* Display stuff */ 90/* */ 91/* **************************************************************** */ 92 93/* This is the stuff that is hard for me. I never seem to write good 94 display routines in C. Let's see how I do this time. */ 95 96/* (PWP) Well... Good for a simple line updater, but totally ignores 97 the problems of input lines longer than the screen width. 98 99 update_line and the code that calls it makes a multiple line, 100 automatically wrapping line update. Careful attention needs 101 to be paid to the vertical position variables. */ 102 103/* Keep two buffers; one which reflects the current contents of the 104 screen, and the other to draw what we think the new contents should 105 be. Then compare the buffers, and make whatever changes to the 106 screen itself that we should. Finally, make the buffer that we 107 just drew into be the one which reflects the current contents of the 108 screen, and place the cursor where it belongs. 109 110 Commands that want to can fix the display themselves, and then let 111 this function know that the display has been fixed by setting the 112 RL_DISPLAY_FIXED variable. This is good for efficiency. */ 113 114/* Application-specific redisplay function. */ 115rl_voidfunc_t *rl_redisplay_function = rl_redisplay; 116 117/* Global variables declared here. */ 118/* What YOU turn on when you have handled all redisplay yourself. */ 119int rl_display_fixed = 0; 120 121int _rl_suppress_redisplay = 0; 122 123/* The stuff that gets printed out before the actual text of the line. 124 This is usually pointing to rl_prompt. */ 125char *rl_display_prompt = (char *)NULL; 126 127/* Pseudo-global variables declared here. */ 128/* The visible cursor position. If you print some text, adjust this. */ 129int _rl_last_c_pos = 0; 130int _rl_last_v_pos = 0; 131 132/* Number of lines currently on screen minus 1. */ 133int _rl_vis_botlin = 0; 134 135/* Variables used only in this file. */ 136/* The last left edge of text that was displayed. This is used when 137 doing horizontal scrolling. It shifts in thirds of a screenwidth. */ 138static int last_lmargin; 139 140/* The line display buffers. One is the line currently displayed on 141 the screen. The other is the line about to be displayed. */ 142static char *visible_line = (char *)NULL; 143static char *invisible_line = (char *)NULL; 144 145/* A buffer for `modeline' messages. */ 146static char msg_buf[128]; 147 148/* Non-zero forces the redisplay even if we thought it was unnecessary. */ 149static int forced_display; 150 151/* Default and initial buffer size. Can grow. */ 152static int line_size = 1024; 153 154/* Variables to keep track of the expanded prompt string, which may 155 include invisible characters. */ 156 157static char *local_prompt, *local_prompt_prefix; 158static int prompt_visible_length, prompt_prefix_length; 159 160/* The number of invisible characters in the line currently being 161 displayed on the screen. */ 162static int visible_wrap_offset; 163 164/* The number of invisible characters in the prompt string. Static so it 165 can be shared between rl_redisplay and update_line */ 166static int wrap_offset; 167 168/* The index of the last invisible character in the prompt string. */ 169static int prompt_last_invisible; 170 171/* The length (buffer offset) of the first line of the last (possibly 172 multi-line) buffer displayed on the screen. */ 173static int visible_first_line_len; 174 175/* Number of invisible characters on the first physical line of the prompt. 176 Only valid when the number of physical characters in the prompt exceeds 177 (or is equal to) _rl_screenwidth. */ 178static int prompt_invis_chars_first_line; 179 180static int prompt_last_screen_line; 181 182/* Expand the prompt string S and return the number of visible 183 characters in *LP, if LP is not null. This is currently more-or-less 184 a placeholder for expansion. LIP, if non-null is a place to store the 185 index of the last invisible character in the returned string. NIFLP, 186 if non-zero, is a place to store the number of invisible characters in 187 the first prompt line. */ 188 189/* Current implementation: 190 \001 (^A) start non-visible characters 191 \002 (^B) end non-visible characters 192 all characters except \001 and \002 (following a \001) are copied to 193 the returned string; all characters except those between \001 and 194 \002 are assumed to be `visible'. */ 195 196static char * 197expand_prompt (pmt, lp, lip, niflp) 198 char *pmt; 199 int *lp, *lip, *niflp; 200{ 201 char *r, *ret, *p; 202 int l, rl, last, ignoring, ninvis, invfl; 203 204 /* Short-circuit if we can. */ 205 if (strchr (pmt, RL_PROMPT_START_IGNORE) == 0) 206 { 207 r = savestring (pmt); 208 if (lp) 209 *lp = strlen (r); 210 return r; 211 } 212 213 l = strlen (pmt); 214 r = ret = (char *)xmalloc (l + 1); 215 216 invfl = 0; /* invisible chars in first line of prompt */ 217 218 for (rl = ignoring = last = ninvis = 0, p = pmt; p && *p; p++) 219 { 220 /* This code strips the invisible character string markers 221 RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */ 222 if (*p == RL_PROMPT_START_IGNORE) 223 { 224 ignoring++; 225 continue; 226 } 227 else if (ignoring && *p == RL_PROMPT_END_IGNORE) 228 { 229 ignoring = 0; 230 last = r - ret - 1; 231 continue; 232 } 233 else 234 { 235 *r++ = *p; 236 if (!ignoring) 237 rl++; 238 else 239 ninvis++; 240 if (rl == _rl_screenwidth) 241 invfl = ninvis; 242 } 243 } 244 245 if (rl < _rl_screenwidth) 246 invfl = ninvis; 247 248 *r = '\0'; 249 if (lp) 250 *lp = rl; 251 if (lip) 252 *lip = last; 253 if (niflp) 254 *niflp = invfl; 255 return ret; 256} 257 258/* Just strip out RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE from 259 PMT and return the rest of PMT. */ 260char * 261_rl_strip_prompt (pmt) 262 char *pmt; 263{ 264 char *ret; 265 266 ret = expand_prompt (pmt, (int *)NULL, (int *)NULL, (int *)NULL); 267 return ret; 268} 269 270/* 271 * Expand the prompt string into the various display components, if 272 * necessary. 273 * 274 * local_prompt = expanded last line of string in rl_display_prompt 275 * (portion after the final newline) 276 * local_prompt_prefix = portion before last newline of rl_display_prompt, 277 * expanded via expand_prompt 278 * prompt_visible_length = number of visible characters in local_prompt 279 * prompt_prefix_length = number of visible characters in local_prompt_prefix 280 * 281 * This function is called once per call to readline(). It may also be 282 * called arbitrarily to expand the primary prompt. 283 * 284 * The return value is the number of visible characters on the last line 285 * of the (possibly multi-line) prompt. 286 */ 287int 288rl_expand_prompt (prompt) 289 char *prompt; 290{ 291 char *p, *t; 292 int c; 293 294 /* Clear out any saved values. */ 295 FREE (local_prompt); 296 FREE (local_prompt_prefix); 297 298 local_prompt = local_prompt_prefix = (char *)0; 299 prompt_last_invisible = prompt_visible_length = 0; 300 301 if (prompt == 0 || *prompt == 0) 302 return (0); 303 304 p = strrchr (prompt, '\n'); 305 if (!p) 306 { 307 /* The prompt is only one logical line, though it might wrap. */ 308 local_prompt = expand_prompt (prompt, &prompt_visible_length, 309 &prompt_last_invisible, 310 &prompt_invis_chars_first_line); 311 local_prompt_prefix = (char *)0; 312 return (prompt_visible_length); 313 } 314 else 315 { 316 /* The prompt spans multiple lines. */ 317 t = ++p; 318 local_prompt = expand_prompt (p, &prompt_visible_length, 319 &prompt_last_invisible, 320 &prompt_invis_chars_first_line); 321 c = *t; *t = '\0'; 322 /* The portion of the prompt string up to and including the 323 final newline is now null-terminated. */ 324 local_prompt_prefix = expand_prompt (prompt, &prompt_prefix_length, 325 (int *)NULL, 326 &prompt_invis_chars_first_line); 327 *t = c; 328 return (prompt_prefix_length); 329 } 330} 331 332/* Initialize the VISIBLE_LINE and INVISIBLE_LINE arrays, and their associated 333 arrays of line break markers. MINSIZE is the minimum size of VISIBLE_LINE 334 and INVISIBLE_LINE; if it is greater than LINE_SIZE, LINE_SIZE is 335 increased. If the lines have already been allocated, this ensures that 336 they can hold at least MINSIZE characters. */ 337static void 338init_line_structures (minsize) 339 int minsize; 340{ 341 register int n; 342 343 if (invisible_line == 0) /* initialize it */ 344 { 345 if (line_size < minsize) 346 line_size = minsize; 347 visible_line = (char *)xmalloc (line_size); 348 invisible_line = (char *)xmalloc (line_size); 349 } 350 else if (line_size < minsize) /* ensure it can hold MINSIZE chars */ 351 { 352 line_size *= 2; 353 if (line_size < minsize) 354 line_size = minsize; 355 visible_line = (char *)xrealloc (visible_line, line_size); 356 invisible_line = (char *)xrealloc (invisible_line, line_size); 357 } 358 359 for (n = minsize; n < line_size; n++) 360 { 361 visible_line[n] = 0; 362 invisible_line[n] = 1; 363 } 364 365 if (vis_lbreaks == 0) 366 { 367 /* should be enough. */ 368 inv_lbsize = vis_lbsize = 256; 369 inv_lbreaks = (int *)xmalloc (inv_lbsize * sizeof (int)); 370 vis_lbreaks = (int *)xmalloc (vis_lbsize * sizeof (int)); 371#if defined (HANDLE_MULTIBYTE) 372 _rl_wrapped_line = (int *)xmalloc (vis_lbsize * sizeof (int)); 373#endif 374 inv_lbreaks[0] = vis_lbreaks[0] = 0; 375 } 376} 377 378/* Basic redisplay algorithm. */ 379void 380rl_redisplay () 381{ 382 register int in, out, c, linenum, cursor_linenum; 383 register char *line; 384 int c_pos, inv_botlin, lb_botlin, lb_linenum; 385 int newlines, lpos, temp; 386 char *prompt_this_line; 387#if defined (HANDLE_MULTIBYTE) 388 wchar_t wc; 389 size_t wc_bytes; 390 int wc_width; 391 mbstate_t ps; 392 int _rl_wrapped_multicolumn = 0; 393#endif 394 395 if (!readline_echoing_p) 396 return; 397 398 if (!rl_display_prompt) 399 rl_display_prompt = ""; 400 401 if (invisible_line == 0) 402 { 403 init_line_structures (0); 404 rl_on_new_line (); 405 } 406 407 /* Draw the line into the buffer. */ 408 c_pos = -1; 409 410 line = invisible_line; 411 out = inv_botlin = 0; 412 413 /* Mark the line as modified or not. We only do this for history 414 lines. */ 415 if (_rl_mark_modified_lines && current_history () && rl_undo_list) 416 { 417 line[out++] = '*'; 418 line[out] = '\0'; 419 } 420 421 /* If someone thought that the redisplay was handled, but the currently 422 visible line has a different modification state than the one about 423 to become visible, then correct the caller's misconception. */ 424 if (visible_line[0] != invisible_line[0]) 425 rl_display_fixed = 0; 426 427 /* If the prompt to be displayed is the `primary' readline prompt (the 428 one passed to readline()), use the values we have already expanded. 429 If not, use what's already in rl_display_prompt. WRAP_OFFSET is the 430 number of non-visible characters in the prompt string. */ 431 if (rl_display_prompt == rl_prompt || local_prompt) 432 { 433 int local_len = local_prompt ? strlen (local_prompt) : 0; 434 if (local_prompt_prefix && forced_display) 435 _rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix)); 436 437 if (local_len > 0) 438 { 439 temp = local_len + out + 2; 440 if (temp >= line_size) 441 { 442 line_size = (temp + 1024) - (temp % 1024); 443 visible_line = (char *)xrealloc (visible_line, line_size); 444 line = invisible_line = (char *)xrealloc (invisible_line, line_size); 445 } 446 strncpy (line + out, local_prompt, local_len); 447 out += local_len; 448 } 449 line[out] = '\0'; 450 wrap_offset = local_len - prompt_visible_length; 451 } 452 else 453 { 454 int pmtlen; 455 prompt_this_line = strrchr (rl_display_prompt, '\n'); 456 if (!prompt_this_line) 457 prompt_this_line = rl_display_prompt; 458 else 459 { 460 prompt_this_line++; 461 pmtlen = prompt_this_line - rl_display_prompt; /* temp var */ 462 if (forced_display) 463 { 464 _rl_output_some_chars (rl_display_prompt, pmtlen); 465 /* Make sure we are at column zero even after a newline, 466 regardless of the state of terminal output processing. */ 467 if (pmtlen < 2 || prompt_this_line[-2] != '\r') 468 cr (); 469 } 470 } 471 472 pmtlen = strlen (prompt_this_line); 473 temp = pmtlen + out + 2; 474 if (temp >= line_size) 475 { 476 line_size = (temp + 1024) - (temp % 1024); 477 visible_line = (char *)xrealloc (visible_line, line_size); 478 line = invisible_line = (char *)xrealloc (invisible_line, line_size); 479 } 480 strncpy (line + out, prompt_this_line, pmtlen); 481 out += pmtlen; 482 line[out] = '\0'; 483 wrap_offset = prompt_invis_chars_first_line = 0; 484 } 485 486#define CHECK_INV_LBREAKS() \ 487 do { \ 488 if (newlines >= (inv_lbsize - 2)) \ 489 { \ 490 inv_lbsize *= 2; \ 491 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \ 492 } \ 493 } while (0) 494 495#if defined (HANDLE_MULTIBYTE) 496#define CHECK_LPOS() \ 497 do { \ 498 lpos++; \ 499 if (lpos >= _rl_screenwidth) \ 500 { \ 501 if (newlines >= (inv_lbsize - 2)) \ 502 { \ 503 inv_lbsize *= 2; \ 504 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \ 505 _rl_wrapped_line = (int *)xrealloc (_rl_wrapped_line, inv_lbsize * sizeof (int)); \ 506 } \ 507 inv_lbreaks[++newlines] = out; \ 508 _rl_wrapped_line[newlines] = _rl_wrapped_multicolumn; \ 509 lpos = 0; \ 510 } \ 511 } while (0) 512#else 513#define CHECK_LPOS() \ 514 do { \ 515 lpos++; \ 516 if (lpos >= _rl_screenwidth) \ 517 { \ 518 if (newlines >= (inv_lbsize - 2)) \ 519 { \ 520 inv_lbsize *= 2; \ 521 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \ 522 } \ 523 inv_lbreaks[++newlines] = out; \ 524 lpos = 0; \ 525 } \ 526 } while (0) 527#endif 528 529 /* inv_lbreaks[i] is where line i starts in the buffer. */ 530 inv_lbreaks[newlines = 0] = 0; 531 lpos = out - wrap_offset; 532#if defined (HANDLE_MULTIBYTE) 533 memset (_rl_wrapped_line, 0, vis_lbsize); 534#endif 535 536 /* prompt_invis_chars_first_line is the number of invisible characters in 537 the first physical line of the prompt. 538 wrap_offset - prompt_invis_chars_first_line is the number of invis 539 chars on the second line. */ 540 541 /* what if lpos is already >= _rl_screenwidth before we start drawing the 542 contents of the command line? */ 543 while (lpos >= _rl_screenwidth) 544 { 545 /* fix from Darin Johnson <darin@acuson.com> for prompt string with 546 invisible characters that is longer than the screen width. The 547 prompt_invis_chars_first_line variable could be made into an array 548 saying how many invisible characters there are per line, but that's 549 probably too much work for the benefit gained. How many people have 550 prompts that exceed two physical lines? */ 551 temp = ((newlines + 1) * _rl_screenwidth) + 552#if 0 553 ((newlines == 0) ? prompt_invis_chars_first_line : 0) + 554#else 555 ((newlines == 0 && local_prompt_prefix == 0) ? prompt_invis_chars_first_line : 0) + 556#endif 557 ((newlines == 1) ? wrap_offset : 0); 558 559 inv_lbreaks[++newlines] = temp; 560 lpos -= _rl_screenwidth; 561 } 562 563 prompt_last_screen_line = newlines; 564 565 /* Draw the rest of the line (after the prompt) into invisible_line, keeping 566 track of where the cursor is (c_pos), the number of the line containing 567 the cursor (lb_linenum), the last line number (lb_botlin and inv_botlin). 568 It maintains an array of line breaks for display (inv_lbreaks). 569 This handles expanding tabs for display and displaying meta characters. */ 570 lb_linenum = 0; 571#if defined (HANDLE_MULTIBYTE) 572 in = 0; 573 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 574 { 575 memset (&ps, 0, sizeof (mbstate_t)); 576 wc_bytes = mbrtowc (&wc, rl_line_buffer, rl_end, &ps); 577 } 578 else 579 wc_bytes = 1; 580 while (in < rl_end) 581#else 582 for (in = 0; in < rl_end; in++) 583#endif 584 { 585 c = (unsigned char)rl_line_buffer[in]; 586 587#if defined (HANDLE_MULTIBYTE) 588 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 589 { 590 if (wc_bytes == (size_t)-1 || wc_bytes == (size_t)-2) 591 { 592 /* Byte sequence is invalid or shortened. Assume that the 593 first byte represents a character. */ 594 wc_bytes = 1; 595 /* Assume that a character occupies a single column. */ 596 wc_width = 1; 597 memset (&ps, 0, sizeof (mbstate_t)); 598 } 599 else if (wc_bytes == (size_t)0) 600 break; /* Found '\0' */ 601 else 602 { 603 temp = wcwidth (wc); 604 wc_width = (temp < 0) ? 1 : temp; 605 } 606 } 607#endif 608 609 if (out + 8 >= line_size) /* XXX - 8 for \t */ 610 { 611 line_size *= 2; 612 visible_line = (char *)xrealloc (visible_line, line_size); 613 invisible_line = (char *)xrealloc (invisible_line, line_size); 614 line = invisible_line; 615 } 616 617 if (in == rl_point) 618 { 619 c_pos = out; 620 lb_linenum = newlines; 621 } 622 623#if defined (HANDLE_MULTIBYTE) 624 if (META_CHAR (c) && _rl_output_meta_chars == 0) /* XXX - clean up */ 625#else 626 if (META_CHAR (c)) 627#endif 628 { 629 if (_rl_output_meta_chars == 0) 630 { 631 sprintf (line + out, "\\%o", c); 632 633 if (lpos + 4 >= _rl_screenwidth) 634 { 635 temp = _rl_screenwidth - lpos; 636 CHECK_INV_LBREAKS (); 637 inv_lbreaks[++newlines] = out + temp; 638 lpos = 4 - temp; 639 } 640 else 641 lpos += 4; 642 643 out += 4; 644 } 645 else 646 { 647 line[out++] = c; 648 CHECK_LPOS(); 649 } 650 } 651#if defined (DISPLAY_TABS) 652 else if (c == '\t') 653 { 654 register int newout; 655 656#if 0 657 newout = (out | (int)7) + 1; 658#else 659 newout = out + 8 - lpos % 8; 660#endif 661 temp = newout - out; 662 if (lpos + temp >= _rl_screenwidth) 663 { 664 register int temp2; 665 temp2 = _rl_screenwidth - lpos; 666 CHECK_INV_LBREAKS (); 667 inv_lbreaks[++newlines] = out + temp2; 668 lpos = temp - temp2; 669 while (out < newout) 670 line[out++] = ' '; 671 } 672 else 673 { 674 while (out < newout) 675 line[out++] = ' '; 676 lpos += temp; 677 } 678 } 679#endif 680 else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up) 681 { 682 line[out++] = '\0'; /* XXX - sentinel */ 683 CHECK_INV_LBREAKS (); 684 inv_lbreaks[++newlines] = out; 685 lpos = 0; 686 } 687 else if (CTRL_CHAR (c) || c == RUBOUT) 688 { 689 line[out++] = '^'; 690 CHECK_LPOS(); 691 line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?'; 692 CHECK_LPOS(); 693 } 694 else 695 { 696#if defined (HANDLE_MULTIBYTE) 697 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 698 { 699 register int i; 700 701 _rl_wrapped_multicolumn = 0; 702 703 if (_rl_screenwidth < lpos + wc_width) 704 for (i = lpos; i < _rl_screenwidth; i++) 705 { 706 /* The space will be removed in update_line() */ 707 line[out++] = ' '; 708 _rl_wrapped_multicolumn++; 709 CHECK_LPOS(); 710 } 711 if (in == rl_point) 712 { 713 c_pos = out; 714 lb_linenum = newlines; 715 } 716 for (i = in; i < in+wc_bytes; i++) 717 line[out++] = rl_line_buffer[i]; 718 for (i = 0; i < wc_width; i++) 719 CHECK_LPOS(); 720 } 721 else 722 { 723 line[out++] = c; 724 CHECK_LPOS(); 725 } 726#else 727 line[out++] = c; 728 CHECK_LPOS(); 729#endif 730 } 731 732#if defined (HANDLE_MULTIBYTE) 733 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 734 { 735 in += wc_bytes; 736 wc_bytes = mbrtowc (&wc, rl_line_buffer + in, rl_end - in, &ps); 737 } 738 else 739 in++; 740#endif 741 742 } 743 line[out] = '\0'; 744 if (c_pos < 0) 745 { 746 c_pos = out; 747 lb_linenum = newlines; 748 } 749 750 inv_botlin = lb_botlin = newlines; 751 CHECK_INV_LBREAKS (); 752 inv_lbreaks[newlines+1] = out; 753 cursor_linenum = lb_linenum; 754 755 /* C_POS == position in buffer where cursor should be placed. 756 CURSOR_LINENUM == line number where the cursor should be placed. */ 757 758 /* PWP: now is when things get a bit hairy. The visible and invisible 759 line buffers are really multiple lines, which would wrap every 760 (screenwidth - 1) characters. Go through each in turn, finding 761 the changed region and updating it. The line order is top to bottom. */ 762 763 /* If we can move the cursor up and down, then use multiple lines, 764 otherwise, let long lines display in a single terminal line, and 765 horizontally scroll it. */ 766 767 if (_rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up) 768 { 769 int nleft, pos, changed_screen_line; 770 771 if (!rl_display_fixed || forced_display) 772 { 773 forced_display = 0; 774 775 /* If we have more than a screenful of material to display, then 776 only display a screenful. We should display the last screen, 777 not the first. */ 778 if (out >= _rl_screenchars) 779 { 780 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 781 out = _rl_find_prev_mbchar (line, _rl_screenchars, MB_FIND_ANY); 782 else 783 out = _rl_screenchars - 1; 784 } 785 786 /* The first line is at character position 0 in the buffer. The 787 second and subsequent lines start at inv_lbreaks[N], offset by 788 OFFSET (which has already been calculated above). */ 789 790#define W_OFFSET(line, offset) ((line) == 0 ? offset : 0) 791#define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l])) 792#define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l]) 793#define VIS_CHARS(line) (visible_line + vis_lbreaks[line]) 794#define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line) 795#define INV_LINE(line) (invisible_line + inv_lbreaks[line]) 796 797 /* For each line in the buffer, do the updating display. */ 798 for (linenum = 0; linenum <= inv_botlin; linenum++) 799 { 800 update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum, 801 VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin); 802 803 /* If this is the line with the prompt, we might need to 804 compensate for invisible characters in the new line. Do 805 this only if there is not more than one new line (which 806 implies that we completely overwrite the old visible line) 807 and the new line is shorter than the old. Make sure we are 808 at the end of the new line before clearing. */ 809 if (linenum == 0 && 810 inv_botlin == 0 && _rl_last_c_pos == out && 811 (wrap_offset > visible_wrap_offset) && 812 (_rl_last_c_pos < visible_first_line_len)) 813 { 814 nleft = _rl_screenwidth + wrap_offset - _rl_last_c_pos; 815 if (nleft) 816 _rl_clear_to_eol (nleft); 817 } 818 819 /* Since the new first line is now visible, save its length. */ 820 if (linenum == 0) 821 visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset; 822 } 823 824 /* We may have deleted some lines. If so, clear the left over 825 blank ones at the bottom out. */ 826 if (_rl_vis_botlin > inv_botlin) 827 { 828 char *tt; 829 for (; linenum <= _rl_vis_botlin; linenum++) 830 { 831 tt = VIS_CHARS (linenum); 832 _rl_move_vert (linenum); 833 _rl_move_cursor_relative (0, tt); 834 _rl_clear_to_eol 835 ((linenum == _rl_vis_botlin) ? strlen (tt) : _rl_screenwidth); 836 } 837 } 838 _rl_vis_botlin = inv_botlin; 839 840 /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a 841 different screen line during this redisplay. */ 842 changed_screen_line = _rl_last_v_pos != cursor_linenum; 843 if (changed_screen_line) 844 { 845 _rl_move_vert (cursor_linenum); 846 /* If we moved up to the line with the prompt using _rl_term_up, 847 the physical cursor position on the screen stays the same, 848 but the buffer position needs to be adjusted to account 849 for invisible characters. */ 850 if (cursor_linenum == 0 && wrap_offset) 851 _rl_last_c_pos += wrap_offset; 852 } 853 854 /* We have to reprint the prompt if it contains invisible 855 characters, since it's not generally OK to just reprint 856 the characters from the current cursor position. But we 857 only need to reprint it if the cursor is before the last 858 invisible character in the prompt string. */ 859 nleft = prompt_visible_length + wrap_offset; 860 if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 && 861 _rl_last_c_pos <= prompt_last_invisible && local_prompt) 862 { 863#if defined (__MSDOS__) 864 putc ('\r', rl_outstream); 865#else 866 if (_rl_term_cr) 867 tputs (_rl_term_cr, 1, _rl_output_character_function); 868#endif 869 _rl_output_some_chars (local_prompt, nleft); 870 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 871 _rl_last_c_pos = _rl_col_width(local_prompt, 0, nleft); 872 else 873 _rl_last_c_pos = nleft; 874 } 875 876 /* Where on that line? And where does that line start 877 in the buffer? */ 878 pos = inv_lbreaks[cursor_linenum]; 879 /* nleft == number of characters in the line buffer between the 880 start of the line and the cursor position. */ 881 nleft = c_pos - pos; 882 883 /* Since _rl_backspace() doesn't know about invisible characters in the 884 prompt, and there's no good way to tell it, we compensate for 885 those characters here and call _rl_backspace() directly. */ 886 if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos) 887 { 888 _rl_backspace (_rl_last_c_pos - nleft); 889 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 890 _rl_last_c_pos = _rl_col_width (&visible_line[pos], 0, nleft); 891 else 892 _rl_last_c_pos = nleft; 893 } 894 895 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 896 _rl_move_cursor_relative (nleft, &invisible_line[pos]); 897 else if (nleft != _rl_last_c_pos) 898 _rl_move_cursor_relative (nleft, &invisible_line[pos]); 899 } 900 } 901 else /* Do horizontal scrolling. */ 902 { 903#define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0) 904 int lmargin, ndisp, nleft, phys_c_pos, t; 905 906 /* Always at top line. */ 907 _rl_last_v_pos = 0; 908 909 /* Compute where in the buffer the displayed line should start. This 910 will be LMARGIN. */ 911 912 /* The number of characters that will be displayed before the cursor. */ 913 ndisp = c_pos - wrap_offset; 914 nleft = prompt_visible_length + wrap_offset; 915 /* Where the new cursor position will be on the screen. This can be 916 longer than SCREENWIDTH; if it is, lmargin will be adjusted. */ 917 phys_c_pos = c_pos - (last_lmargin ? last_lmargin : wrap_offset); 918 t = _rl_screenwidth / 3; 919 920 /* If the number of characters had already exceeded the screenwidth, 921 last_lmargin will be > 0. */ 922 923 /* If the number of characters to be displayed is more than the screen 924 width, compute the starting offset so that the cursor is about 925 two-thirds of the way across the screen. */ 926 if (phys_c_pos > _rl_screenwidth - 2) 927 { 928 lmargin = c_pos - (2 * t); 929 if (lmargin < 0) 930 lmargin = 0; 931 /* If the left margin would be in the middle of a prompt with 932 invisible characters, don't display the prompt at all. */ 933 if (wrap_offset && lmargin > 0 && lmargin < nleft) 934 lmargin = nleft; 935 } 936 else if (ndisp < _rl_screenwidth - 2) /* XXX - was -1 */ 937 lmargin = 0; 938 else if (phys_c_pos < 1) 939 { 940 /* If we are moving back towards the beginning of the line and 941 the last margin is no longer correct, compute a new one. */ 942 lmargin = ((c_pos - 1) / t) * t; /* XXX */ 943 if (wrap_offset && lmargin > 0 && lmargin < nleft) 944 lmargin = nleft; 945 } 946 else 947 lmargin = last_lmargin; 948 949 /* If the first character on the screen isn't the first character 950 in the display line, indicate this with a special character. */ 951 if (lmargin > 0) 952 line[lmargin] = '<'; 953 954 /* If SCREENWIDTH characters starting at LMARGIN do not encompass 955 the whole line, indicate that with a special character at the 956 right edge of the screen. If LMARGIN is 0, we need to take the 957 wrap offset into account. */ 958 t = lmargin + M_OFFSET (lmargin, wrap_offset) + _rl_screenwidth; 959 if (t < out) 960 line[t - 1] = '>'; 961 962 if (!rl_display_fixed || forced_display || lmargin != last_lmargin) 963 { 964 forced_display = 0; 965 update_line (&visible_line[last_lmargin], 966 &invisible_line[lmargin], 967 0, 968 _rl_screenwidth + visible_wrap_offset, 969 _rl_screenwidth + (lmargin ? 0 : wrap_offset), 970 0); 971 972 /* If the visible new line is shorter than the old, but the number 973 of invisible characters is greater, and we are at the end of 974 the new line, we need to clear to eol. */ 975 t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset); 976 if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) && 977 (_rl_last_c_pos == out) && 978 t < visible_first_line_len) 979 { 980 nleft = _rl_screenwidth - t; 981 _rl_clear_to_eol (nleft); 982 } 983 visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset); 984 if (visible_first_line_len > _rl_screenwidth) 985 visible_first_line_len = _rl_screenwidth; 986 987 _rl_move_cursor_relative (c_pos - lmargin, &invisible_line[lmargin]); 988 last_lmargin = lmargin; 989 } 990 } 991 fflush (rl_outstream); 992 993 /* Swap visible and non-visible lines. */ 994 { 995 char *vtemp = visible_line; 996 int *itemp = vis_lbreaks, ntemp = vis_lbsize; 997 998 visible_line = invisible_line; 999 invisible_line = vtemp; 1000 1001 vis_lbreaks = inv_lbreaks; 1002 inv_lbreaks = itemp; 1003 1004 vis_lbsize = inv_lbsize; 1005 inv_lbsize = ntemp; 1006 1007 rl_display_fixed = 0; 1008 /* If we are displaying on a single line, and last_lmargin is > 0, we 1009 are not displaying any invisible characters, so set visible_wrap_offset 1010 to 0. */ 1011 if (_rl_horizontal_scroll_mode && last_lmargin) 1012 visible_wrap_offset = 0; 1013 else 1014 visible_wrap_offset = wrap_offset; 1015 } 1016} 1017 1018/* PWP: update_line() is based on finding the middle difference of each 1019 line on the screen; vis: 1020 1021 /old first difference 1022 /beginning of line | /old last same /old EOL 1023 v v v v 1024old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as 1025new: eddie> Oh, my little buggy says to me, as lurgid as 1026 ^ ^ ^ ^ 1027 \beginning of line | \new last same \new end of line 1028 \new first difference 1029 1030 All are character pointers for the sake of speed. Special cases for 1031 no differences, as well as for end of line additions must be handled. 1032 1033 Could be made even smarter, but this works well enough */ 1034static void 1035update_line (old, new, current_line, omax, nmax, inv_botlin) 1036 register char *old, *new; 1037 int current_line, omax, nmax, inv_botlin; 1038{ 1039 register char *ofd, *ols, *oe, *nfd, *nls, *ne; 1040 int temp, lendiff, wsatend, od, nd; 1041 int current_invis_chars; 1042 int col_lendiff, col_temp; 1043#if defined (HANDLE_MULTIBYTE) 1044 mbstate_t ps_new, ps_old; 1045 int new_offset, old_offset, tmp; 1046#endif 1047 1048 /* If we're at the right edge of a terminal that supports xn, we're 1049 ready to wrap around, so do so. This fixes problems with knowing 1050 the exact cursor position and cut-and-paste with certain terminal 1051 emulators. In this calculation, TEMP is the physical screen 1052 position of the cursor. */ 1053 temp = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset); 1054 if (temp == _rl_screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode 1055 && _rl_last_v_pos == current_line - 1) 1056 { 1057#if defined (HANDLE_MULTIBYTE) 1058 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1059 { 1060 wchar_t wc; 1061 mbstate_t ps; 1062 int tempwidth, bytes; 1063 size_t ret; 1064 1065 /* This fixes only double-column characters, but if the wrapped 1066 character comsumes more than three columns, spaces will be 1067 inserted in the string buffer. */ 1068 if (_rl_wrapped_line[current_line] > 0) 1069 _rl_clear_to_eol (_rl_wrapped_line[current_line]); 1070 1071 memset (&ps, 0, sizeof (mbstate_t)); 1072 ret = mbrtowc (&wc, new, MB_CUR_MAX, &ps); 1073 if (ret == (size_t)-1 || ret == (size_t)-2) 1074 { 1075 tempwidth = 1; 1076 ret = 1; 1077 } 1078 else if (ret == 0) 1079 tempwidth = 0; 1080 else 1081 tempwidth = wcwidth (wc); 1082 1083 if (tempwidth > 0) 1084 { 1085 int count; 1086 bytes = ret; 1087 for (count = 0; count < bytes; count++) 1088 putc (new[count], rl_outstream); 1089 _rl_last_c_pos = tempwidth; 1090 _rl_last_v_pos++; 1091 memset (&ps, 0, sizeof (mbstate_t)); 1092 ret = mbrtowc (&wc, old, MB_CUR_MAX, &ps); 1093 if (ret != 0 && bytes != 0) 1094 { 1095 if (ret == (size_t)-1 || ret == (size_t)-2) 1096 memmove (old+bytes, old+1, strlen (old+1)); 1097 else 1098 memmove (old+bytes, old+ret, strlen (old+ret)); 1099 memcpy (old, new, bytes); 1100 } 1101 } 1102 else 1103 { 1104 putc (' ', rl_outstream); 1105 _rl_last_c_pos = 1; 1106 _rl_last_v_pos++; 1107 if (old[0] && new[0]) 1108 old[0] = new[0]; 1109 } 1110 } 1111 else 1112#endif 1113 { 1114 if (new[0]) 1115 putc (new[0], rl_outstream); 1116 else 1117 putc (' ', rl_outstream); 1118 _rl_last_c_pos = 1; /* XXX */ 1119 _rl_last_v_pos++; 1120 if (old[0] && new[0]) 1121 old[0] = new[0]; 1122 } 1123 } 1124 1125 1126 /* Find first difference. */ 1127#if defined (HANDLE_MULTIBYTE) 1128 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1129 { 1130 memset (&ps_new, 0, sizeof(mbstate_t)); 1131 memset (&ps_old, 0, sizeof(mbstate_t)); 1132 1133 new_offset = old_offset = 0; 1134 for (ofd = old, nfd = new; 1135 (ofd - old < omax) && *ofd && 1136 _rl_compare_chars(old, old_offset, &ps_old, new, new_offset, &ps_new); ) 1137 { 1138 old_offset = _rl_find_next_mbchar (old, old_offset, 1, MB_FIND_ANY); 1139 new_offset = _rl_find_next_mbchar (new, new_offset, 1, MB_FIND_ANY); 1140 ofd = old + old_offset; 1141 nfd = new + new_offset; 1142 } 1143 } 1144 else 1145#endif 1146 for (ofd = old, nfd = new; 1147 (ofd - old < omax) && *ofd && (*ofd == *nfd); 1148 ofd++, nfd++) 1149 ; 1150 1151 /* Move to the end of the screen line. ND and OD are used to keep track 1152 of the distance between ne and new and oe and old, respectively, to 1153 move a subtraction out of each loop. */ 1154 for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++); 1155 for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++); 1156 1157 /* If no difference, continue to next line. */ 1158 if (ofd == oe && nfd == ne) 1159 return; 1160 1161 wsatend = 1; /* flag for trailing whitespace */ 1162 1163#if defined (HANDLE_MULTIBYTE) 1164 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1165 { 1166 ols = old + _rl_find_prev_mbchar (old, oe - old, MB_FIND_ANY); 1167 nls = new + _rl_find_prev_mbchar (new, ne - new, MB_FIND_ANY); 1168 while ((ols > ofd) && (nls > nfd)) 1169 { 1170 memset (&ps_old, 0, sizeof (mbstate_t)); 1171 memset (&ps_new, 0, sizeof (mbstate_t)); 1172 1173 _rl_adjust_point (old, ols - old, &ps_old); 1174 _rl_adjust_point (new, nls - new, &ps_new); 1175 1176 if (_rl_compare_chars (old, ols - old, &ps_old, new, nls - new, &ps_new) == 0) 1177 break; 1178 1179 if (*ols == ' ') 1180 wsatend = 0; 1181 1182 ols = old + _rl_find_prev_mbchar (old, ols - old, MB_FIND_ANY); 1183 nls = new + _rl_find_prev_mbchar (new, nls - new, MB_FIND_ANY); 1184 } 1185 } 1186 else 1187 { 1188#endif /* HANDLE_MULTIBYTE */ 1189 ols = oe - 1; /* find last same */ 1190 nls = ne - 1; 1191 while ((ols > ofd) && (nls > nfd) && (*ols == *nls)) 1192 { 1193 if (*ols != ' ') 1194 wsatend = 0; 1195 ols--; 1196 nls--; 1197 } 1198#if defined (HANDLE_MULTIBYTE) 1199 } 1200#endif 1201 1202 if (wsatend) 1203 { 1204 ols = oe; 1205 nls = ne; 1206 } 1207#if defined (HANDLE_MULTIBYTE) 1208 /* This may not work for stateful encoding, but who cares? To handle 1209 stateful encoding properly, we have to scan each string from the 1210 beginning and compare. */ 1211 else if (_rl_compare_chars (ols, 0, NULL, nls, 0, NULL) == 0) 1212#else 1213 else if (*ols != *nls) 1214#endif 1215 { 1216 if (*ols) /* don't step past the NUL */ 1217 { 1218 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1219 ols = old + _rl_find_next_mbchar (old, ols - old, 1, MB_FIND_ANY); 1220 else 1221 ols++; 1222 } 1223 if (*nls) 1224 { 1225 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1226 nls = new + _rl_find_next_mbchar (new, nls - new, 1, MB_FIND_ANY); 1227 else 1228 nls++; 1229 } 1230 } 1231 1232 /* count of invisible characters in the current invisible line. */ 1233 current_invis_chars = W_OFFSET (current_line, wrap_offset); 1234 if (_rl_last_v_pos != current_line) 1235 { 1236 _rl_move_vert (current_line); 1237 if (current_line == 0 && visible_wrap_offset) 1238 _rl_last_c_pos += visible_wrap_offset; 1239 } 1240 1241 /* If this is the first line and there are invisible characters in the 1242 prompt string, and the prompt string has not changed, and the current 1243 cursor position is before the last invisible character in the prompt, 1244 and the index of the character to move to is past the end of the prompt 1245 string, then redraw the entire prompt string. We can only do this 1246 reliably if the terminal supports a `cr' capability. 1247 1248 This is not an efficiency hack -- there is a problem with redrawing 1249 portions of the prompt string if they contain terminal escape 1250 sequences (like drawing the `unbold' sequence without a corresponding 1251 `bold') that manifests itself on certain terminals. */ 1252 1253 lendiff = local_prompt ? strlen (local_prompt) : 0; 1254 od = ofd - old; /* index of first difference in visible line */ 1255 if (current_line == 0 && !_rl_horizontal_scroll_mode && 1256 _rl_term_cr && lendiff > prompt_visible_length && _rl_last_c_pos > 0 && 1257 od >= lendiff && _rl_last_c_pos <= prompt_last_invisible) 1258 { 1259#if defined (__MSDOS__) 1260 putc ('\r', rl_outstream); 1261#else 1262 tputs (_rl_term_cr, 1, _rl_output_character_function); 1263#endif 1264 _rl_output_some_chars (local_prompt, lendiff); 1265 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1266 _rl_last_c_pos = _rl_col_width (local_prompt, 0, lendiff); 1267 else 1268 _rl_last_c_pos = lendiff; 1269 } 1270 1271 _rl_move_cursor_relative (od, old); 1272 1273 /* if (len (new) > len (old)) 1274 lendiff == difference in buffer 1275 col_lendiff == difference on screen 1276 When not using multibyte characters, these are equal */ 1277 lendiff = (nls - nfd) - (ols - ofd); 1278 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1279 col_lendiff = _rl_col_width (new, nfd - new, nls - new) - _rl_col_width (old, ofd - old, ols - old); 1280 else 1281 col_lendiff = lendiff; 1282 1283 /* If we are changing the number of invisible characters in a line, and 1284 the spot of first difference is before the end of the invisible chars, 1285 lendiff needs to be adjusted. */ 1286 if (current_line == 0 && !_rl_horizontal_scroll_mode && 1287 current_invis_chars != visible_wrap_offset) 1288 { 1289 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1290 { 1291 lendiff += visible_wrap_offset - current_invis_chars; 1292 col_lendiff += visible_wrap_offset - current_invis_chars; 1293 } 1294 else 1295 { 1296 lendiff += visible_wrap_offset - current_invis_chars; 1297 col_lendiff = lendiff; 1298 } 1299 } 1300 1301 /* Insert (diff (len (old), len (new)) ch. */ 1302 temp = ne - nfd; 1303 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1304 col_temp = _rl_col_width (new, nfd - new, ne - new); 1305 else 1306 col_temp = temp; 1307 1308 if (col_lendiff > 0) /* XXX - was lendiff */ 1309 { 1310 /* Non-zero if we're increasing the number of lines. */ 1311 int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin; 1312 /* Sometimes it is cheaper to print the characters rather than 1313 use the terminal's capabilities. If we're growing the number 1314 of lines, make sure we actually cause the new line to wrap 1315 around on auto-wrapping terminals. */ 1316 if (_rl_terminal_can_insert && ((2 * col_temp) >= col_lendiff || _rl_term_IC) && (!_rl_term_autowrap || !gl)) 1317 { 1318 /* If lendiff > prompt_visible_length and _rl_last_c_pos == 0 and 1319 _rl_horizontal_scroll_mode == 1, inserting the characters with 1320 _rl_term_IC or _rl_term_ic will screw up the screen because of the 1321 invisible characters. We need to just draw them. */ 1322 if (*ols && (!_rl_horizontal_scroll_mode || _rl_last_c_pos > 0 || 1323 lendiff <= prompt_visible_length || !current_invis_chars)) 1324 { 1325 insert_some_chars (nfd, lendiff, col_lendiff); 1326 _rl_last_c_pos += col_lendiff; 1327 } 1328 else if (*ols == 0) 1329 { 1330 /* At the end of a line the characters do not have to 1331 be "inserted". They can just be placed on the screen. */ 1332 /* However, this screws up the rest of this block, which 1333 assumes you've done the insert because you can. */ 1334 _rl_output_some_chars (nfd, lendiff); 1335 _rl_last_c_pos += col_lendiff; 1336 } 1337 else 1338 { 1339 /* We have horizontal scrolling and we are not inserting at 1340 the end. We have invisible characters in this line. This 1341 is a dumb update. */ 1342 _rl_output_some_chars (nfd, temp); 1343 _rl_last_c_pos += col_temp; 1344 return; 1345 } 1346 /* Copy (new) chars to screen from first diff to last match. */ 1347 temp = nls - nfd; 1348 if ((temp - lendiff) > 0) 1349 { 1350 _rl_output_some_chars (nfd + lendiff, temp - lendiff); 1351#if 0 1352 _rl_last_c_pos += _rl_col_width (nfd+lendiff, 0, temp-lendiff) - col_lendiff; 1353#else 1354 _rl_last_c_pos += _rl_col_width (nfd+lendiff, 0, temp-col_lendiff); 1355#endif 1356 } 1357 } 1358 else 1359 { 1360 /* cannot insert chars, write to EOL */ 1361 _rl_output_some_chars (nfd, temp); 1362 _rl_last_c_pos += col_temp; 1363 } 1364 } 1365 else /* Delete characters from line. */ 1366 { 1367 /* If possible and inexpensive to use terminal deletion, then do so. */ 1368 if (_rl_term_dc && (2 * col_temp) >= -col_lendiff) 1369 { 1370 /* If all we're doing is erasing the invisible characters in the 1371 prompt string, don't bother. It screws up the assumptions 1372 about what's on the screen. */ 1373 if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 && 1374 -lendiff == visible_wrap_offset) 1375 col_lendiff = 0; 1376 1377 if (col_lendiff) 1378 delete_chars (-col_lendiff); /* delete (diff) characters */ 1379 1380 /* Copy (new) chars to screen from first diff to last match */ 1381 temp = nls - nfd; 1382 if (temp > 0) 1383 { 1384 _rl_output_some_chars (nfd, temp); 1385 _rl_last_c_pos += _rl_col_width (nfd, 0, temp);; 1386 } 1387 } 1388 /* Otherwise, print over the existing material. */ 1389 else 1390 { 1391 if (temp > 0) 1392 { 1393 _rl_output_some_chars (nfd, temp); 1394 _rl_last_c_pos += col_temp; 1395 } 1396 lendiff = (oe - old) - (ne - new); 1397 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1398 col_lendiff = _rl_col_width (old, 0, oe - old) - _rl_col_width (new, 0, ne - new); 1399 else 1400 col_lendiff = lendiff; 1401 1402 if (col_lendiff) 1403 { 1404 if (_rl_term_autowrap && current_line < inv_botlin) 1405 space_to_eol (col_lendiff); 1406 else 1407 _rl_clear_to_eol (col_lendiff); 1408 } 1409 } 1410 } 1411} 1412 1413/* Tell the update routines that we have moved onto a new (empty) line. */ 1414int 1415rl_on_new_line () 1416{ 1417 if (visible_line) 1418 visible_line[0] = '\0'; 1419 1420 _rl_last_c_pos = _rl_last_v_pos = 0; 1421 _rl_vis_botlin = last_lmargin = 0; 1422 if (vis_lbreaks) 1423 vis_lbreaks[0] = vis_lbreaks[1] = 0; 1424 visible_wrap_offset = 0; 1425 return 0; 1426} 1427 1428/* Tell the update routines that we have moved onto a new line with the 1429 prompt already displayed. Code originally from the version of readline 1430 distributed with CLISP. */ 1431int 1432rl_on_new_line_with_prompt () 1433{ 1434 int prompt_size, i, l, real_screenwidth, newlines; 1435 char *prompt_last_line; 1436 1437 /* Initialize visible_line and invisible_line to ensure that they can hold 1438 the already-displayed prompt. */ 1439 prompt_size = strlen (rl_prompt) + 1; 1440 init_line_structures (prompt_size); 1441 1442 /* Make sure the line structures hold the already-displayed prompt for 1443 redisplay. */ 1444 strcpy (visible_line, rl_prompt); 1445 strcpy (invisible_line, rl_prompt); 1446 1447 /* If the prompt contains newlines, take the last tail. */ 1448 prompt_last_line = strrchr (rl_prompt, '\n'); 1449 if (!prompt_last_line) 1450 prompt_last_line = rl_prompt; 1451 1452 l = strlen (prompt_last_line); 1453 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1454 _rl_last_c_pos = _rl_col_width (prompt_last_line, 0, l); 1455 else 1456 _rl_last_c_pos = l; 1457 1458 /* Dissect prompt_last_line into screen lines. Note that here we have 1459 to use the real screenwidth. Readline's notion of screenwidth might be 1460 one less, see terminal.c. */ 1461 real_screenwidth = _rl_screenwidth + (_rl_term_autowrap ? 0 : 1); 1462 _rl_last_v_pos = l / real_screenwidth; 1463 /* If the prompt length is a multiple of real_screenwidth, we don't know 1464 whether the cursor is at the end of the last line, or already at the 1465 beginning of the next line. Output a newline just to be safe. */ 1466 if (l > 0 && (l % real_screenwidth) == 0) 1467 _rl_output_some_chars ("\n", 1); 1468 last_lmargin = 0; 1469 1470 newlines = 0; i = 0; 1471 while (i <= l) 1472 { 1473 _rl_vis_botlin = newlines; 1474 vis_lbreaks[newlines++] = i; 1475 i += real_screenwidth; 1476 } 1477 vis_lbreaks[newlines] = l; 1478 visible_wrap_offset = 0; 1479 1480 return 0; 1481} 1482 1483/* Actually update the display, period. */ 1484int 1485rl_forced_update_display () 1486{ 1487 if (visible_line) 1488 { 1489 register char *temp = visible_line; 1490 1491 while (*temp) 1492 *temp++ = '\0'; 1493 } 1494 rl_on_new_line (); 1495 forced_display++; 1496 (*rl_redisplay_function) (); 1497 return 0; 1498} 1499 1500/* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices. 1501 DATA is the contents of the screen line of interest; i.e., where 1502 the movement is being done. */ 1503void 1504_rl_move_cursor_relative (new, data) 1505 int new; 1506 const char *data; 1507{ 1508 register int i; 1509 1510 /* If we don't have to do anything, then return. */ 1511#if defined (HANDLE_MULTIBYTE) 1512 /* If we have multibyte characters, NEW is indexed by the buffer point in 1513 a multibyte string, but _rl_last_c_pos is the display position. In 1514 this case, NEW's display position is not obvious. */ 1515 if ((MB_CUR_MAX == 1 || rl_byte_oriented ) && _rl_last_c_pos == new) return; 1516#else 1517 if (_rl_last_c_pos == new) return; 1518#endif 1519 1520 /* It may be faster to output a CR, and then move forwards instead 1521 of moving backwards. */ 1522 /* i == current physical cursor position. */ 1523 i = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset); 1524 if (new == 0 || CR_FASTER (new, _rl_last_c_pos) || 1525 (_rl_term_autowrap && i == _rl_screenwidth)) 1526 { 1527#if defined (__MSDOS__) 1528 putc ('\r', rl_outstream); 1529#else 1530 tputs (_rl_term_cr, 1, _rl_output_character_function); 1531#endif /* !__MSDOS__ */ 1532 _rl_last_c_pos = 0; 1533 } 1534 1535 if (_rl_last_c_pos < new) 1536 { 1537 /* Move the cursor forward. We do it by printing the command 1538 to move the cursor forward if there is one, else print that 1539 portion of the output buffer again. Which is cheaper? */ 1540 1541 /* The above comment is left here for posterity. It is faster 1542 to print one character (non-control) than to print a control 1543 sequence telling the terminal to move forward one character. 1544 That kind of control is for people who don't know what the 1545 data is underneath the cursor. */ 1546#if defined (HACK_TERMCAP_MOTION) 1547 if (_rl_term_forward_char) 1548 { 1549 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1550 { 1551 int width; 1552 width = _rl_col_width (data, _rl_last_c_pos, new); 1553 for (i = 0; i < width; i++) 1554 tputs (_rl_term_forward_char, 1, _rl_output_character_function); 1555 } 1556 else 1557 { 1558 for (i = _rl_last_c_pos; i < new; i++) 1559 tputs (_rl_term_forward_char, 1, _rl_output_character_function); 1560 } 1561 } 1562 else if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1563 { 1564 tputs (_rl_term_cr, 1, _rl_output_character_function); 1565 for (i = 0; i < new; i++) 1566 putc (data[i], rl_outstream); 1567 } 1568 else 1569 for (i = _rl_last_c_pos; i < new; i++) 1570 putc (data[i], rl_outstream); 1571 1572#else /* !HACK_TERMCAP_MOTION */ 1573 1574 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1575 { 1576 tputs (_rl_term_cr, 1, _rl_output_character_function); 1577 for (i = 0; i < new; i++) 1578 putc (data[i], rl_outstream); 1579 } 1580 else 1581 for (i = _rl_last_c_pos; i < new; i++) 1582 putc (data[i], rl_outstream); 1583 1584#endif /* !HACK_TERMCAP_MOTION */ 1585 1586 } 1587#if defined (HANDLE_MULTIBYTE) 1588 /* NEW points to the buffer point, but _rl_last_c_pos is the display point. 1589 The byte length of the string is probably bigger than the column width 1590 of the string, which means that if NEW == _rl_last_c_pos, then NEW's 1591 display point is less than _rl_last_c_pos. */ 1592 else if (_rl_last_c_pos >= new) 1593#else 1594 else if (_rl_last_c_pos > new) 1595#endif 1596 { 1597 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1598 { 1599 tputs (_rl_term_cr, 1, _rl_output_character_function); 1600 for (i = 0; i < new; i++) 1601 putc (data[i], rl_outstream); 1602 } 1603 else 1604 _rl_backspace (_rl_last_c_pos - new); 1605 } 1606 1607 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) 1608 _rl_last_c_pos = _rl_col_width (data, 0, new); 1609 else 1610 _rl_last_c_pos = new; 1611} 1612 1613/* PWP: move the cursor up or down. */ 1614void 1615_rl_move_vert (to) 1616 int to; 1617{ 1618 register int delta, i; 1619 1620 if (_rl_last_v_pos == to || to > _rl_screenheight) 1621 return; 1622 1623 if ((delta = to - _rl_last_v_pos) > 0) 1624 { 1625 for (i = 0; i < delta; i++) 1626 putc ('\n', rl_outstream); 1627#if defined (__MSDOS__) 1628 putc ('\r', rl_outstream); 1629#else 1630 tputs (_rl_term_cr, 1, _rl_output_character_function); 1631#endif 1632 _rl_last_c_pos = 0; 1633 } 1634 else 1635 { /* delta < 0 */ 1636 if (_rl_term_up && *_rl_term_up) 1637 for (i = 0; i < -delta; i++) 1638 tputs (_rl_term_up, 1, _rl_output_character_function); 1639 } 1640 1641 _rl_last_v_pos = to; /* Now TO is here */ 1642} 1643 1644/* Physically print C on rl_outstream. This is for functions which know 1645 how to optimize the display. Return the number of characters output. */ 1646int 1647rl_show_char (c) 1648 int c; 1649{ 1650 int n = 1; 1651 if (META_CHAR (c) && (_rl_output_meta_chars == 0)) 1652 { 1653 fprintf (rl_outstream, "M-"); 1654 n += 2; 1655 c = UNMETA (c); 1656 } 1657 1658#if defined (DISPLAY_TABS) 1659 if ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT) 1660#else 1661 if (CTRL_CHAR (c) || c == RUBOUT) 1662#endif /* !DISPLAY_TABS */ 1663 { 1664 fprintf (rl_outstream, "C-"); 1665 n += 2; 1666 c = CTRL_CHAR (c) ? UNCTRL (c) : '?'; 1667 } 1668 1669 putc (c, rl_outstream); 1670 fflush (rl_outstream); 1671 return n; 1672} 1673 1674int 1675rl_character_len (c, pos) 1676 register int c, pos; 1677{ 1678 unsigned char uc; 1679 1680 uc = (unsigned char)c; 1681 1682 if (META_CHAR (uc)) 1683 return ((_rl_output_meta_chars == 0) ? 4 : 1); 1684 1685 if (uc == '\t') 1686 { 1687#if defined (DISPLAY_TABS) 1688 return (((pos | 7) + 1) - pos); 1689#else 1690 return (2); 1691#endif /* !DISPLAY_TABS */ 1692 } 1693 1694 if (CTRL_CHAR (c) || c == RUBOUT) 1695 return (2); 1696 1697 return ((ISPRINT (uc)) ? 1 : 2); 1698} 1699 1700/* How to print things in the "echo-area". The prompt is treated as a 1701 mini-modeline. */ 1702 1703#if defined (USE_VARARGS) 1704int 1705#if defined (PREFER_STDARG) 1706rl_message (const char *format, ...) 1707#else 1708rl_message (va_alist) 1709 va_dcl 1710#endif 1711{ 1712 va_list args; 1713#if defined (PREFER_VARARGS) 1714 char *format; 1715#endif 1716 1717#if defined (PREFER_STDARG) 1718 va_start (args, format); 1719#else 1720 va_start (args); 1721 format = va_arg (args, char *); 1722#endif 1723 1724#if defined (HAVE_VSNPRINTF) 1725 vsnprintf (msg_buf, sizeof (msg_buf) - 1, format, args); 1726#else 1727 vsprintf (msg_buf, format, args); 1728 msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */ 1729#endif 1730 va_end (args); 1731 1732 rl_display_prompt = msg_buf; 1733 (*rl_redisplay_function) (); 1734 return 0; 1735} 1736#else /* !USE_VARARGS */ 1737int 1738rl_message (format, arg1, arg2) 1739 char *format; 1740{ 1741 sprintf (msg_buf, format, arg1, arg2); 1742 msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */ 1743 rl_display_prompt = msg_buf; 1744 (*rl_redisplay_function) (); 1745 return 0; 1746} 1747#endif /* !USE_VARARGS */ 1748 1749/* How to clear things from the "echo-area". */ 1750int 1751rl_clear_message () 1752{ 1753 rl_display_prompt = rl_prompt; 1754 (*rl_redisplay_function) (); 1755 return 0; 1756} 1757 1758int 1759rl_reset_line_state () 1760{ 1761 rl_on_new_line (); 1762 1763 rl_display_prompt = rl_prompt ? rl_prompt : ""; 1764 forced_display = 1; 1765 return 0; 1766} 1767 1768static char *saved_local_prompt; 1769static char *saved_local_prefix; 1770static int saved_last_invisible; 1771static int saved_visible_length; 1772 1773void 1774rl_save_prompt () 1775{ 1776 saved_local_prompt = local_prompt; 1777 saved_local_prefix = local_prompt_prefix; 1778 saved_last_invisible = prompt_last_invisible; 1779 saved_visible_length = prompt_visible_length; 1780 1781 local_prompt = local_prompt_prefix = (char *)0; 1782 prompt_last_invisible = prompt_visible_length = 0; 1783} 1784 1785void 1786rl_restore_prompt () 1787{ 1788 FREE (local_prompt); 1789 FREE (local_prompt_prefix); 1790 1791 local_prompt = saved_local_prompt; 1792 local_prompt_prefix = saved_local_prefix; 1793 prompt_last_invisible = saved_last_invisible; 1794 prompt_visible_length = saved_visible_length; 1795} 1796 1797char * 1798_rl_make_prompt_for_search (pchar) 1799 int pchar; 1800{ 1801 int len; 1802 char *pmt; 1803 1804 rl_save_prompt (); 1805 1806 if (saved_local_prompt == 0) 1807 { 1808 len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0; 1809 pmt = (char *)xmalloc (len + 2); 1810 if (len) 1811 strcpy (pmt, rl_prompt); 1812 pmt[len] = pchar; 1813 pmt[len+1] = '\0'; 1814 } 1815 else 1816 { 1817 len = *saved_local_prompt ? strlen (saved_local_prompt) : 0; 1818 pmt = (char *)xmalloc (len + 2); 1819 if (len) 1820 strcpy (pmt, saved_local_prompt); 1821 pmt[len] = pchar; 1822 pmt[len+1] = '\0'; 1823 local_prompt = savestring (pmt); 1824 prompt_last_invisible = saved_last_invisible; 1825 prompt_visible_length = saved_visible_length + 1; 1826 } 1827 return pmt; 1828} 1829 1830/* Quick redisplay hack when erasing characters at the end of the line. */ 1831void 1832_rl_erase_at_end_of_line (l) 1833 int l; 1834{ 1835 register int i; 1836 1837 _rl_backspace (l); 1838 for (i = 0; i < l; i++) 1839 putc (' ', rl_outstream); 1840 _rl_backspace (l); 1841 for (i = 0; i < l; i++) 1842 visible_line[--_rl_last_c_pos] = '\0'; 1843 rl_display_fixed++; 1844} 1845 1846/* Clear to the end of the line. COUNT is the minimum 1847 number of character spaces to clear, */ 1848void 1849_rl_clear_to_eol (count) 1850 int count; 1851{ 1852 if (_rl_term_clreol) 1853 tputs (_rl_term_clreol, 1, _rl_output_character_function); 1854 else if (count) 1855 space_to_eol (count); 1856} 1857 1858/* Clear to the end of the line using spaces. COUNT is the minimum 1859 number of character spaces to clear, */ 1860static void 1861space_to_eol (count) 1862 int count; 1863{ 1864 register int i; 1865 1866 for (i = 0; i < count; i++) 1867 putc (' ', rl_outstream); 1868 1869 _rl_last_c_pos += count; 1870} 1871 1872void 1873_rl_clear_screen () 1874{ 1875 if (_rl_term_clrpag) 1876 tputs (_rl_term_clrpag, 1, _rl_output_character_function); 1877 else 1878 rl_crlf (); 1879} 1880 1881/* Insert COUNT characters from STRING to the output stream at column COL. */ 1882static void 1883insert_some_chars (string, count, col) 1884 char *string; 1885 int count, col; 1886{ 1887 /* DEBUGGING */ 1888 if (MB_CUR_MAX == 1 || rl_byte_oriented) 1889 if (count != col) 1890 fprintf(stderr, "readline: debug: insert_some_chars: count (%d) != col (%d)\n", count, col); 1891 1892 /* If IC is defined, then we do not have to "enter" insert mode. */ 1893 if (_rl_term_IC) 1894 { 1895 char *buffer; 1896 1897 buffer = tgoto (_rl_term_IC, 0, col); 1898 tputs (buffer, 1, _rl_output_character_function); 1899 _rl_output_some_chars (string, count); 1900 } 1901 else 1902 { 1903 register int i; 1904 1905 /* If we have to turn on insert-mode, then do so. */ 1906 if (_rl_term_im && *_rl_term_im) 1907 tputs (_rl_term_im, 1, _rl_output_character_function); 1908 1909 /* If there is a special command for inserting characters, then 1910 use that first to open up the space. */ 1911 if (_rl_term_ic && *_rl_term_ic) 1912 { 1913 for (i = col; i--; ) 1914 tputs (_rl_term_ic, 1, _rl_output_character_function); 1915 } 1916 1917 /* Print the text. */ 1918 _rl_output_some_chars (string, count); 1919 1920 /* If there is a string to turn off insert mode, we had best use 1921 it now. */ 1922 if (_rl_term_ei && *_rl_term_ei) 1923 tputs (_rl_term_ei, 1, _rl_output_character_function); 1924 } 1925} 1926 1927/* Delete COUNT characters from the display line. */ 1928static void 1929delete_chars (count) 1930 int count; 1931{ 1932 if (count > _rl_screenwidth) /* XXX */ 1933 return; 1934 1935 if (_rl_term_DC && *_rl_term_DC) 1936 { 1937 char *buffer; 1938 buffer = tgoto (_rl_term_DC, count, count); 1939 tputs (buffer, count, _rl_output_character_function); 1940 } 1941 else 1942 { 1943 if (_rl_term_dc && *_rl_term_dc) 1944 while (count--) 1945 tputs (_rl_term_dc, 1, _rl_output_character_function); 1946 } 1947} 1948 1949void 1950_rl_update_final () 1951{ 1952 int full_lines; 1953 1954 full_lines = 0; 1955 /* If the cursor is the only thing on an otherwise-blank last line, 1956 compensate so we don't print an extra CRLF. */ 1957 if (_rl_vis_botlin && _rl_last_c_pos == 0 && 1958 visible_line[vis_lbreaks[_rl_vis_botlin]] == 0) 1959 { 1960 _rl_vis_botlin--; 1961 full_lines = 1; 1962 } 1963 _rl_move_vert (_rl_vis_botlin); 1964 /* If we've wrapped lines, remove the final xterm line-wrap flag. */ 1965 if (full_lines && _rl_term_autowrap && (VIS_LLEN(_rl_vis_botlin) == _rl_screenwidth)) 1966 { 1967 char *last_line; 1968 1969 last_line = &visible_line[vis_lbreaks[_rl_vis_botlin]]; 1970 _rl_move_cursor_relative (_rl_screenwidth - 1, last_line); 1971 _rl_clear_to_eol (0); 1972 putc (last_line[_rl_screenwidth - 1], rl_outstream); 1973 } 1974 _rl_vis_botlin = 0; 1975 rl_crlf (); 1976 fflush (rl_outstream); 1977 rl_display_fixed++; 1978} 1979 1980/* Move to the start of the current line. */ 1981static void 1982cr () 1983{ 1984 if (_rl_term_cr) 1985 { 1986#if defined (__MSDOS__) 1987 putc ('\r', rl_outstream); 1988#else 1989 tputs (_rl_term_cr, 1, _rl_output_character_function); 1990#endif 1991 _rl_last_c_pos = 0; 1992 } 1993} 1994 1995/* Redraw the last line of a multi-line prompt that may possibly contain 1996 terminal escape sequences. Called with the cursor at column 0 of the 1997 line to draw the prompt on. */ 1998static void 1999redraw_prompt (t) 2000 char *t; 2001{ 2002 char *oldp, *oldl, *oldlprefix; 2003 int oldlen, oldlast, oldplen, oldninvis; 2004 2005 /* Geez, I should make this a struct. */ 2006 oldp = rl_display_prompt; 2007 oldl = local_prompt; 2008 oldlprefix = local_prompt_prefix; 2009 oldlen = prompt_visible_length; 2010 oldplen = prompt_prefix_length; 2011 oldlast = prompt_last_invisible; 2012 oldninvis = prompt_invis_chars_first_line; 2013 2014 rl_display_prompt = t; 2015 local_prompt = expand_prompt (t, &prompt_visible_length, 2016 &prompt_last_invisible, 2017 &prompt_invis_chars_first_line); 2018 local_prompt_prefix = (char *)NULL; 2019 rl_forced_update_display (); 2020 2021 rl_display_prompt = oldp; 2022 local_prompt = oldl; 2023 local_prompt_prefix = oldlprefix; 2024 prompt_visible_length = oldlen; 2025 prompt_prefix_length = oldplen; 2026 prompt_last_invisible = oldlast; 2027 prompt_invis_chars_first_line = oldninvis; 2028} 2029 2030/* Redisplay the current line after a SIGWINCH is received. */ 2031void 2032_rl_redisplay_after_sigwinch () 2033{ 2034 char *t; 2035 2036 /* Clear the current line and put the cursor at column 0. Make sure 2037 the right thing happens if we have wrapped to a new screen line. */ 2038 if (_rl_term_cr) 2039 { 2040#if defined (__MSDOS__) 2041 putc ('\r', rl_outstream); 2042#else 2043 tputs (_rl_term_cr, 1, _rl_output_character_function); 2044#endif 2045 _rl_last_c_pos = 0; 2046#if defined (__MSDOS__) 2047 space_to_eol (_rl_screenwidth); 2048 putc ('\r', rl_outstream); 2049#else 2050 if (_rl_term_clreol) 2051 tputs (_rl_term_clreol, 1, _rl_output_character_function); 2052 else 2053 { 2054 space_to_eol (_rl_screenwidth); 2055 tputs (_rl_term_cr, 1, _rl_output_character_function); 2056 } 2057#endif 2058 if (_rl_last_v_pos > 0) 2059 _rl_move_vert (0); 2060 } 2061 else 2062 rl_crlf (); 2063 2064 /* Redraw only the last line of a multi-line prompt. */ 2065 t = strrchr (rl_display_prompt, '\n'); 2066 if (t) 2067 redraw_prompt (++t); 2068 else 2069 rl_forced_update_display (); 2070} 2071 2072void 2073_rl_clean_up_for_exit () 2074{ 2075 if (readline_echoing_p) 2076 { 2077 _rl_move_vert (_rl_vis_botlin); 2078 _rl_vis_botlin = 0; 2079 fflush (rl_outstream); 2080 rl_restart_output (1, 0); 2081 } 2082} 2083 2084void 2085_rl_erase_entire_line () 2086{ 2087 cr (); 2088 _rl_clear_to_eol (0); 2089 cr (); 2090 fflush (rl_outstream); 2091} 2092 2093/* return the `current display line' of the cursor -- the number of lines to 2094 move up to get to the first screen line of the current readline line. */ 2095int 2096_rl_current_display_line () 2097{ 2098 int ret, nleft; 2099 2100 /* Find out whether or not there might be invisible characters in the 2101 editing buffer. */ 2102 if (rl_display_prompt == rl_prompt) 2103 nleft = _rl_last_c_pos - _rl_screenwidth - rl_visible_prompt_length; 2104 else 2105 nleft = _rl_last_c_pos - _rl_screenwidth; 2106 2107 if (nleft > 0) 2108 ret = 1 + nleft / _rl_screenwidth; 2109 else 2110 ret = 0; 2111 2112 return ret; 2113} 2114 2115#if defined (HANDLE_MULTIBYTE) 2116/* Calculate the number of screen columns occupied by STR from START to END. 2117 In the case of multibyte characters with stateful encoding, we have to 2118 scan from the beginning of the string to take the state into account. */ 2119static int 2120_rl_col_width (str, start, end) 2121 char *str; 2122 int start, end; 2123{ 2124 wchar_t wc; 2125 mbstate_t ps = {0}; 2126 int tmp, point, width, max; 2127 2128 if (end <= start) 2129 return 0; 2130 2131 point = 0; 2132 max = end; 2133 2134 while (point < start) 2135 { 2136 tmp = mbrlen (str + point, max, &ps); 2137 if ((size_t)tmp == (size_t)-1 || (size_t)tmp == (size_t)-2) 2138 { 2139 /* In this case, the bytes are invalid or too short to compose a 2140 multibyte character, so we assume that the first byte represents 2141 a single character. */ 2142 point++; 2143 max--; 2144 2145 /* Clear the state of the byte sequence, because in this case the 2146 effect of mbstate is undefined. */ 2147 memset (&ps, 0, sizeof (mbstate_t)); 2148 } 2149 else if (tmp == 0) 2150 break; /* Found '\0' */ 2151 else 2152 { 2153 point += tmp; 2154 max -= tmp; 2155 } 2156 } 2157 2158 /* If START is not a byte that starts a character, then POINT will be 2159 greater than START. In this case, assume that (POINT - START) gives 2160 a byte count that is the number of columns of difference. */ 2161 width = point - start; 2162 2163 while (point < end) 2164 { 2165 tmp = mbrtowc (&wc, str + point, max, &ps); 2166 if ((size_t)tmp == (size_t)-1 || (size_t)tmp == (size_t)-2) 2167 { 2168 /* In this case, the bytes are invalid or too short to compose a 2169 multibyte character, so we assume that the first byte represents 2170 a single character. */ 2171 point++; 2172 max--; 2173 2174 /* and assume that the byte occupies a single column. */ 2175 width++; 2176 2177 /* Clear the state of the byte sequence, because in this case the 2178 effect of mbstate is undefined. */ 2179 memset (&ps, 0, sizeof (mbstate_t)); 2180 } 2181 else if (tmp == 0) 2182 break; /* Found '\0' */ 2183 else 2184 { 2185 point += tmp; 2186 max -= tmp; 2187 tmp = wcwidth(wc); 2188 width += (tmp >= 0) ? tmp : 1; 2189 } 2190 } 2191 2192 width += point - end; 2193 2194 return width; 2195} 2196#endif /* HANDLE_MULTIBYTE */ 2197 2198