| 1 | /* display.c -- readline redisplay facility. */ |
| 2 | |
| 3 | /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the GNU Readline Library, a library for |
| 6 | reading lines of text with interactive input and history editing. |
| 7 | |
| 8 | The GNU Readline Library is free software; you can redistribute it |
| 9 | and/or modify it under the terms of the GNU General Public License |
| 10 | as published by the Free Software Foundation; either version 1, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | The GNU Readline Library is distributed in the hope that it will be |
| 14 | useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
| 15 | of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | The GNU General Public License is often shipped with GNU software, and |
| 19 | is generally kept in a file called COPYING or LICENSE. If you do not |
| 20 | have a copy of the license, write to the Free Software Foundation, |
| 21 | 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include <sys/types.h> |
| 25 | |
| 26 | /* System-specific feature definitions and include files. */ |
| 27 | #include "rldefs.h" |
| 28 | |
| 29 | /* Some standard library routines. */ |
| 30 | #include "readline.h" |
| 31 | #include "history.h" |
| 32 | |
| 33 | #if !defined (strrchr) |
| 34 | extern char *strrchr (); |
| 35 | #endif /* !strchr */ |
| 36 | |
| 37 | /* Global and pseudo-global variables and functions |
| 38 | imported from readline.c. */ |
| 39 | extern char *rl_prompt; |
| 40 | extern int readline_echoing_p; |
| 41 | extern char *term_clreol, *term_im, *term_ic, *term_ei, *term_DC; |
| 42 | /* Termcap variables. */ |
| 43 | extern char *term_up, *term_dc, *term_cr, *term_IC; |
| 44 | extern int screenheight, screenwidth, terminal_can_insert, term_xn; |
| 45 | |
| 46 | extern void _rl_output_some_chars (); |
| 47 | extern int _rl_output_character_function (); |
| 48 | |
| 49 | extern int _rl_convert_meta_chars_to_ascii; |
| 50 | extern int _rl_horizontal_scroll_mode; |
| 51 | extern int _rl_mark_modified_lines; |
| 52 | extern int _rl_prefer_visible_bell; |
| 53 | |
| 54 | /* Pseudo-global functions (local to the readline library) exported |
| 55 | by this file. */ |
| 56 | void _rl_move_cursor_relative (), _rl_output_some_chars (); |
| 57 | void _rl_move_vert (); |
| 58 | |
| 59 | static void update_line (), clear_to_eol (); |
| 60 | static void delete_chars (), insert_some_chars (); |
| 61 | |
| 62 | extern char *xmalloc (), *xrealloc (); |
| 63 | |
| 64 | /* **************************************************************** */ |
| 65 | /* */ |
| 66 | /* Display stuff */ |
| 67 | /* */ |
| 68 | /* **************************************************************** */ |
| 69 | |
| 70 | /* This is the stuff that is hard for me. I never seem to write good |
| 71 | display routines in C. Let's see how I do this time. */ |
| 72 | |
| 73 | /* (PWP) Well... Good for a simple line updater, but totally ignores |
| 74 | the problems of input lines longer than the screen width. |
| 75 | |
| 76 | update_line and the code that calls it makes a multiple line, |
| 77 | automatically wrapping line update. Carefull attention needs |
| 78 | to be paid to the vertical position variables. */ |
| 79 | |
| 80 | /* Keep two buffers; one which reflects the current contents of the |
| 81 | screen, and the other to draw what we think the new contents should |
| 82 | be. Then compare the buffers, and make whatever changes to the |
| 83 | screen itself that we should. Finally, make the buffer that we |
| 84 | just drew into be the one which reflects the current contents of the |
| 85 | screen, and place the cursor where it belongs. |
| 86 | |
| 87 | Commands that want to can fix the display themselves, and then let |
| 88 | this function know that the display has been fixed by setting the |
| 89 | RL_DISPLAY_FIXED variable. This is good for efficiency. */ |
| 90 | |
| 91 | /* What YOU turn on when you have handled all redisplay yourself. */ |
| 92 | int rl_display_fixed = 0; |
| 93 | |
| 94 | /* The stuff that gets printed out before the actual text of the line. |
| 95 | This is usually pointing to rl_prompt. */ |
| 96 | char *rl_display_prompt = (char *)NULL; |
| 97 | |
| 98 | /* Pseudo-global variables declared here. */ |
| 99 | /* The visible cursor position. If you print some text, adjust this. */ |
| 100 | int _rl_last_c_pos = 0; |
| 101 | int _rl_last_v_pos = 0; |
| 102 | |
| 103 | /* Number of lines currently on screen minus 1. */ |
| 104 | int _rl_vis_botlin = 0; |
| 105 | |
| 106 | /* Variables used only in this file. */ |
| 107 | /* The last left edge of text that was displayed. This is used when |
| 108 | doing horizontal scrolling. It shifts in thirds of a screenwidth. */ |
| 109 | static int last_lmargin = 0; |
| 110 | |
| 111 | /* The line display buffers. One is the line currently displayed on |
| 112 | the screen. The other is the line about to be displayed. */ |
| 113 | static char *visible_line = (char *)NULL; |
| 114 | static char *invisible_line = (char *)NULL; |
| 115 | |
| 116 | /* A buffer for `modeline' messages. */ |
| 117 | static char msg_buf[128]; |
| 118 | |
| 119 | /* Non-zero forces the redisplay even if we thought it was unnecessary. */ |
| 120 | static int forced_display = 0; |
| 121 | |
| 122 | /* Default and initial buffer size. Can grow. */ |
| 123 | static int line_size = 1024; |
| 124 | |
| 125 | /* Basic redisplay algorithm. */ |
| 126 | rl_redisplay () |
| 127 | { |
| 128 | register int in, out, c, linenum; |
| 129 | register char *line = invisible_line; |
| 130 | char *prompt_this_line; |
| 131 | int c_pos = 0; |
| 132 | int inv_botlin = 0; /* Number of lines in newly drawn buffer. */ |
| 133 | |
| 134 | if (!readline_echoing_p) |
| 135 | return; |
| 136 | |
| 137 | if (!rl_display_prompt) |
| 138 | rl_display_prompt = ""; |
| 139 | |
| 140 | if (!invisible_line) |
| 141 | { |
| 142 | visible_line = (char *)xmalloc (line_size); |
| 143 | invisible_line = (char *)xmalloc (line_size); |
| 144 | line = invisible_line; |
| 145 | for (in = 0; in < line_size; in++) |
| 146 | { |
| 147 | visible_line[in] = 0; |
| 148 | invisible_line[in] = 1; |
| 149 | } |
| 150 | rl_on_new_line (); |
| 151 | } |
| 152 | |
| 153 | /* Draw the line into the buffer. */ |
| 154 | c_pos = -1; |
| 155 | |
| 156 | /* Mark the line as modified or not. We only do this for history |
| 157 | lines. */ |
| 158 | out = 0; |
| 159 | if (_rl_mark_modified_lines && current_history () && rl_undo_list) |
| 160 | { |
| 161 | line[out++] = '*'; |
| 162 | line[out] = '\0'; |
| 163 | } |
| 164 | |
| 165 | /* If someone thought that the redisplay was handled, but the currently |
| 166 | visible line has a different modification state than the one about |
| 167 | to become visible, then correct the caller's misconception. */ |
| 168 | if (visible_line[0] != invisible_line[0]) |
| 169 | rl_display_fixed = 0; |
| 170 | |
| 171 | prompt_this_line = strrchr (rl_display_prompt, '\n'); |
| 172 | if (!prompt_this_line) |
| 173 | prompt_this_line = rl_display_prompt; |
| 174 | else |
| 175 | { |
| 176 | prompt_this_line++; |
| 177 | if (forced_display) |
| 178 | _rl_output_some_chars |
| 179 | (rl_display_prompt, prompt_this_line - rl_display_prompt); |
| 180 | } |
| 181 | |
| 182 | strncpy (line + out, prompt_this_line, strlen (prompt_this_line)); |
| 183 | out += strlen (prompt_this_line); |
| 184 | line[out] = '\0'; |
| 185 | |
| 186 | for (in = 0; in < rl_end; in++) |
| 187 | { |
| 188 | c = (unsigned char)rl_line_buffer[in]; |
| 189 | |
| 190 | if (out + 8 >= line_size) /* XXX - 8 for \t */ |
| 191 | { |
| 192 | line_size *= 2; |
| 193 | visible_line = (char *)xrealloc (visible_line, line_size); |
| 194 | invisible_line = (char *)xrealloc (invisible_line, line_size); |
| 195 | line = invisible_line; |
| 196 | } |
| 197 | |
| 198 | if (in == rl_point) |
| 199 | c_pos = out; |
| 200 | |
| 201 | if (META_CHAR (c)) |
| 202 | { |
| 203 | if (_rl_convert_meta_chars_to_ascii) |
| 204 | { |
| 205 | sprintf (line + out, "\\%o", c); |
| 206 | out += 4; |
| 207 | } |
| 208 | else |
| 209 | line[out++] = c; |
| 210 | } |
| 211 | #define DISPLAY_TABS |
| 212 | #if defined (DISPLAY_TABS) |
| 213 | else if (c == '\t') |
| 214 | { |
| 215 | register int newout = (out | (int)7) + 1; |
| 216 | while (out < newout) |
| 217 | line[out++] = ' '; |
| 218 | } |
| 219 | #endif |
| 220 | else if (c < ' ') |
| 221 | { |
| 222 | line[out++] = '^'; |
| 223 | line[out++] = UNCTRL (c); /* XXX was c ^ 0x40 */ |
| 224 | } |
| 225 | else if (c == 127) |
| 226 | { |
| 227 | line[out++] = '^'; |
| 228 | line[out++] = '?'; |
| 229 | } |
| 230 | else |
| 231 | line[out++] = c; |
| 232 | } |
| 233 | line[out] = '\0'; |
| 234 | if (c_pos < 0) |
| 235 | c_pos = out; |
| 236 | |
| 237 | /* PWP: now is when things get a bit hairy. The visible and invisible |
| 238 | line buffers are really multiple lines, which would wrap every |
| 239 | screenwidth characters. Go through each in turn, finding |
| 240 | the changed region and updating it. The line order is top to bottom. */ |
| 241 | |
| 242 | /* If we can move the cursor up and down, then use multiple lines, |
| 243 | otherwise, let long lines display in a single terminal line, and |
| 244 | horizontally scroll it. */ |
| 245 | |
| 246 | if (!_rl_horizontal_scroll_mode && term_up && *term_up) |
| 247 | { |
| 248 | int total_screen_chars = (screenwidth * screenheight); |
| 249 | |
| 250 | if (!rl_display_fixed || forced_display) |
| 251 | { |
| 252 | forced_display = 0; |
| 253 | |
| 254 | /* If we have more than a screenful of material to display, then |
| 255 | only display a screenful. We should display the last screen, |
| 256 | not the first. I'll fix this in a minute. */ |
| 257 | if (out >= total_screen_chars) |
| 258 | out = total_screen_chars - 1; |
| 259 | |
| 260 | /* Number of screen lines to display. */ |
| 261 | inv_botlin = out / screenwidth; |
| 262 | |
| 263 | /* For each line in the buffer, do the updating display. */ |
| 264 | for (linenum = 0; linenum <= inv_botlin; linenum++) |
| 265 | update_line (linenum > _rl_vis_botlin ? "" |
| 266 | : &visible_line[linenum * screenwidth], |
| 267 | &invisible_line[linenum * screenwidth], |
| 268 | linenum); |
| 269 | |
| 270 | /* We may have deleted some lines. If so, clear the left over |
| 271 | blank ones at the bottom out. */ |
| 272 | if (_rl_vis_botlin > inv_botlin) |
| 273 | { |
| 274 | char *tt; |
| 275 | for (; linenum <= _rl_vis_botlin; linenum++) |
| 276 | { |
| 277 | tt = &visible_line[linenum * screenwidth]; |
| 278 | _rl_move_vert (linenum); |
| 279 | _rl_move_cursor_relative (0, tt); |
| 280 | clear_to_eol |
| 281 | ((linenum == _rl_vis_botlin) ? strlen (tt) : screenwidth); |
| 282 | } |
| 283 | } |
| 284 | _rl_vis_botlin = inv_botlin; |
| 285 | |
| 286 | /* Move the cursor where it should be. */ |
| 287 | _rl_move_vert (c_pos / screenwidth); |
| 288 | _rl_move_cursor_relative (c_pos % screenwidth, |
| 289 | &invisible_line[(c_pos / screenwidth) * screenwidth]); |
| 290 | } |
| 291 | } |
| 292 | else /* Do horizontal scrolling. */ |
| 293 | { |
| 294 | int lmargin; |
| 295 | |
| 296 | /* Always at top line. */ |
| 297 | _rl_last_v_pos = 0; |
| 298 | |
| 299 | /* If the display position of the cursor would be off the edge |
| 300 | of the screen, start the display of this line at an offset that |
| 301 | leaves the cursor on the screen. */ |
| 302 | if (c_pos - last_lmargin > screenwidth - 2) |
| 303 | lmargin = (c_pos / (screenwidth / 3) - 2) * (screenwidth / 3); |
| 304 | else if (c_pos - last_lmargin < 1) |
| 305 | lmargin = ((c_pos - 1) / (screenwidth / 3)) * (screenwidth / 3); |
| 306 | else |
| 307 | lmargin = last_lmargin; |
| 308 | |
| 309 | /* If the first character on the screen isn't the first character |
| 310 | in the display line, indicate this with a special character. */ |
| 311 | if (lmargin > 0) |
| 312 | line[lmargin] = '<'; |
| 313 | |
| 314 | if (lmargin + screenwidth < out) |
| 315 | line[lmargin + screenwidth - 1] = '>'; |
| 316 | |
| 317 | if (!rl_display_fixed || forced_display || lmargin != last_lmargin) |
| 318 | { |
| 319 | forced_display = 0; |
| 320 | update_line (&visible_line[last_lmargin], |
| 321 | &invisible_line[lmargin], 0); |
| 322 | |
| 323 | _rl_move_cursor_relative (c_pos - lmargin, &invisible_line[lmargin]); |
| 324 | last_lmargin = lmargin; |
| 325 | } |
| 326 | } |
| 327 | fflush (rl_outstream); |
| 328 | |
| 329 | /* Swap visible and non-visible lines. */ |
| 330 | { |
| 331 | char *temp = visible_line; |
| 332 | visible_line = invisible_line; |
| 333 | invisible_line = temp; |
| 334 | rl_display_fixed = 0; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | /* PWP: update_line() is based on finding the middle difference of each |
| 339 | line on the screen; vis: |
| 340 | |
| 341 | /old first difference |
| 342 | /beginning of line | /old last same /old EOL |
| 343 | v v v v |
| 344 | old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as |
| 345 | new: eddie> Oh, my little buggy says to me, as lurgid as |
| 346 | ^ ^ ^ ^ |
| 347 | \beginning of line | \new last same \new end of line |
| 348 | \new first difference |
| 349 | |
| 350 | All are character pointers for the sake of speed. Special cases for |
| 351 | no differences, as well as for end of line additions must be handeled. |
| 352 | |
| 353 | Could be made even smarter, but this works well enough */ |
| 354 | static void |
| 355 | update_line (old, new, current_line) |
| 356 | register char *old, *new; |
| 357 | int current_line; |
| 358 | { |
| 359 | register char *ofd, *ols, *oe, *nfd, *nls, *ne; |
| 360 | int lendiff, wsatend; |
| 361 | |
| 362 | if (_rl_last_c_pos == screenwidth && term_xn && new[0]) |
| 363 | { |
| 364 | putc (new[0], rl_outstream); |
| 365 | _rl_last_c_pos = 1; |
| 366 | _rl_last_v_pos++; |
| 367 | if (old[0]) |
| 368 | old[0] = new[0]; |
| 369 | } |
| 370 | |
| 371 | /* Find first difference. */ |
| 372 | for (ofd = old, nfd = new; |
| 373 | (ofd - old < screenwidth) && *ofd && (*ofd == *nfd); |
| 374 | ofd++, nfd++) |
| 375 | ; |
| 376 | |
| 377 | /* Move to the end of the screen line. */ |
| 378 | for (oe = ofd; ((oe - old) < screenwidth) && *oe; oe++); |
| 379 | for (ne = nfd; ((ne - new) < screenwidth) && *ne; ne++); |
| 380 | |
| 381 | /* If no difference, continue to next line. */ |
| 382 | if (ofd == oe && nfd == ne) |
| 383 | return; |
| 384 | |
| 385 | wsatend = 1; /* flag for trailing whitespace */ |
| 386 | ols = oe - 1; /* find last same */ |
| 387 | nls = ne - 1; |
| 388 | while ((ols > ofd) && (nls > nfd) && (*ols == *nls)) |
| 389 | { |
| 390 | if (*ols != ' ') |
| 391 | wsatend = 0; |
| 392 | ols--; |
| 393 | nls--; |
| 394 | } |
| 395 | |
| 396 | if (wsatend) |
| 397 | { |
| 398 | ols = oe; |
| 399 | nls = ne; |
| 400 | } |
| 401 | else if (*ols != *nls) |
| 402 | { |
| 403 | if (*ols) /* don't step past the NUL */ |
| 404 | ols++; |
| 405 | if (*nls) |
| 406 | nls++; |
| 407 | } |
| 408 | |
| 409 | _rl_move_vert (current_line); |
| 410 | _rl_move_cursor_relative (ofd - old, old); |
| 411 | |
| 412 | /* if (len (new) > len (old)) */ |
| 413 | lendiff = (nls - nfd) - (ols - ofd); |
| 414 | |
| 415 | /* Insert (diff (len (old), len (new)) ch. */ |
| 416 | if (lendiff > 0) |
| 417 | { |
| 418 | if (terminal_can_insert) |
| 419 | { |
| 420 | /* Sometimes it is cheaper to print the characters rather than |
| 421 | use the terminal's capabilities. */ |
| 422 | if ((2 * (ne - nfd)) < lendiff && !term_IC) |
| 423 | { |
| 424 | _rl_output_some_chars (nfd, (ne - nfd)); |
| 425 | _rl_last_c_pos += (ne - nfd); |
| 426 | } |
| 427 | else |
| 428 | { |
| 429 | if (*ols) |
| 430 | { |
| 431 | insert_some_chars (nfd, lendiff); |
| 432 | _rl_last_c_pos += lendiff; |
| 433 | } |
| 434 | else |
| 435 | { |
| 436 | /* At the end of a line the characters do not have to |
| 437 | be "inserted". They can just be placed on the screen. */ |
| 438 | _rl_output_some_chars (nfd, lendiff); |
| 439 | _rl_last_c_pos += lendiff; |
| 440 | } |
| 441 | /* Copy (new) chars to screen from first diff to last match. */ |
| 442 | if (((nls - nfd) - lendiff) > 0) |
| 443 | { |
| 444 | _rl_output_some_chars (&nfd[lendiff], ((nls - nfd) - lendiff)); |
| 445 | _rl_last_c_pos += ((nls - nfd) - lendiff); |
| 446 | } |
| 447 | } |
| 448 | } |
| 449 | else |
| 450 | { /* cannot insert chars, write to EOL */ |
| 451 | _rl_output_some_chars (nfd, (ne - nfd)); |
| 452 | _rl_last_c_pos += (ne - nfd); |
| 453 | } |
| 454 | } |
| 455 | else /* Delete characters from line. */ |
| 456 | { |
| 457 | /* If possible and inexpensive to use terminal deletion, then do so. */ |
| 458 | if (term_dc && (2 * (ne - nfd)) >= (-lendiff)) |
| 459 | { |
| 460 | if (lendiff) |
| 461 | delete_chars (-lendiff); /* delete (diff) characters */ |
| 462 | |
| 463 | /* Copy (new) chars to screen from first diff to last match */ |
| 464 | if ((nls - nfd) > 0) |
| 465 | { |
| 466 | _rl_output_some_chars (nfd, (nls - nfd)); |
| 467 | _rl_last_c_pos += (nls - nfd); |
| 468 | } |
| 469 | } |
| 470 | /* Otherwise, print over the existing material. */ |
| 471 | else |
| 472 | { |
| 473 | _rl_output_some_chars (nfd, (ne - nfd)); |
| 474 | _rl_last_c_pos += (ne - nfd); |
| 475 | clear_to_eol ((oe - old) - (ne - new)); |
| 476 | } |
| 477 | } |
| 478 | } |
| 479 | |
| 480 | /* Tell the update routines that we have moved onto a new (empty) line. */ |
| 481 | rl_on_new_line () |
| 482 | { |
| 483 | if (visible_line) |
| 484 | visible_line[0] = '\0'; |
| 485 | |
| 486 | _rl_last_c_pos = _rl_last_v_pos = 0; |
| 487 | _rl_vis_botlin = last_lmargin = 0; |
| 488 | } |
| 489 | |
| 490 | /* Actually update the display, period. */ |
| 491 | rl_forced_update_display () |
| 492 | { |
| 493 | if (visible_line) |
| 494 | { |
| 495 | register char *temp = visible_line; |
| 496 | |
| 497 | while (*temp) *temp++ = '\0'; |
| 498 | } |
| 499 | rl_on_new_line (); |
| 500 | forced_display++; |
| 501 | rl_redisplay (); |
| 502 | } |
| 503 | |
| 504 | /* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices. |
| 505 | DATA is the contents of the screen line of interest; i.e., where |
| 506 | the movement is being done. */ |
| 507 | void |
| 508 | _rl_move_cursor_relative (new, data) |
| 509 | int new; |
| 510 | char *data; |
| 511 | { |
| 512 | register int i; |
| 513 | |
| 514 | /* It may be faster to output a CR, and then move forwards instead |
| 515 | of moving backwards. */ |
| 516 | if (new + 1 < _rl_last_c_pos - new) |
| 517 | { |
| 518 | #ifdef __MSDOS__ |
| 519 | putc('\r', rl_outstream); |
| 520 | #else |
| 521 | tputs (term_cr, 1, _rl_output_character_function); |
| 522 | #endif |
| 523 | _rl_last_c_pos = 0; |
| 524 | } |
| 525 | |
| 526 | if (_rl_last_c_pos == new) return; |
| 527 | |
| 528 | if (_rl_last_c_pos < new) |
| 529 | { |
| 530 | /* Move the cursor forward. We do it by printing the command |
| 531 | to move the cursor forward if there is one, else print that |
| 532 | portion of the output buffer again. Which is cheaper? */ |
| 533 | |
| 534 | /* The above comment is left here for posterity. It is faster |
| 535 | to print one character (non-control) than to print a control |
| 536 | sequence telling the terminal to move forward one character. |
| 537 | That kind of control is for people who don't know what the |
| 538 | data is underneath the cursor. */ |
| 539 | #if defined (HACK_TERMCAP_MOTION) |
| 540 | extern char *term_forward_char; |
| 541 | |
| 542 | if (term_forward_char) |
| 543 | for (i = _rl_last_c_pos; i < new; i++) |
| 544 | tputs (term_forward_char, 1, _rl_output_character_function); |
| 545 | else |
| 546 | for (i = _rl_last_c_pos; i < new; i++) |
| 547 | putc (data[i], rl_outstream); |
| 548 | #else |
| 549 | for (i = _rl_last_c_pos; i < new; i++) |
| 550 | putc (data[i], rl_outstream); |
| 551 | #endif /* HACK_TERMCAP_MOTION */ |
| 552 | } |
| 553 | else |
| 554 | backspace (_rl_last_c_pos - new); |
| 555 | _rl_last_c_pos = new; |
| 556 | } |
| 557 | |
| 558 | /* PWP: move the cursor up or down. */ |
| 559 | void |
| 560 | _rl_move_vert (to) |
| 561 | int to; |
| 562 | { |
| 563 | register int delta, i; |
| 564 | |
| 565 | if (_rl_last_v_pos == to || to > screenheight) |
| 566 | return; |
| 567 | |
| 568 | #ifdef __GO32__ |
| 569 | { |
| 570 | int row, col; |
| 571 | ScreenGetCursor (&row, &col); |
| 572 | ScreenSetCursor ((row + to - _rl_last_v_pos), col); |
| 573 | } |
| 574 | #else /* __GO32__ */ |
| 575 | if ((delta = to - _rl_last_v_pos) > 0) |
| 576 | { |
| 577 | for (i = 0; i < delta; i++) |
| 578 | putc ('\n', rl_outstream); |
| 579 | tputs (term_cr, 1, _rl_output_character_function); |
| 580 | _rl_last_c_pos = 0; |
| 581 | } |
| 582 | else |
| 583 | { /* delta < 0 */ |
| 584 | if (term_up && *term_up) |
| 585 | for (i = 0; i < -delta; i++) |
| 586 | tputs (term_up, 1, _rl_output_character_function); |
| 587 | } |
| 588 | #endif /* !__GO32__ */ |
| 589 | _rl_last_v_pos = to; /* Now TO is here */ |
| 590 | } |
| 591 | |
| 592 | /* Physically print C on rl_outstream. This is for functions which know |
| 593 | how to optimize the display. */ |
| 594 | rl_show_char (c) |
| 595 | int c; |
| 596 | { |
| 597 | if (META_CHAR (c) && _rl_convert_meta_chars_to_ascii) |
| 598 | { |
| 599 | fprintf (rl_outstream, "M-"); |
| 600 | c = UNMETA (c); |
| 601 | } |
| 602 | |
| 603 | #if defined (DISPLAY_TABS) |
| 604 | if (c < 32 && c != '\t') |
| 605 | #else |
| 606 | if (c < 32) |
| 607 | #endif /* !DISPLAY_TABS */ |
| 608 | { |
| 609 | |
| 610 | c += 64; |
| 611 | } |
| 612 | |
| 613 | putc (c, rl_outstream); |
| 614 | fflush (rl_outstream); |
| 615 | } |
| 616 | |
| 617 | int |
| 618 | rl_character_len (c, pos) |
| 619 | register int c, pos; |
| 620 | { |
| 621 | if (META_CHAR (c)) |
| 622 | return (_rl_convert_meta_chars_to_ascii ? 4 : 1); |
| 623 | |
| 624 | if (c == '\t') |
| 625 | { |
| 626 | #if defined (DISPLAY_TABS) |
| 627 | return (((pos | (int)7) + 1) - pos); |
| 628 | #else |
| 629 | return (2); |
| 630 | #endif /* !DISPLAY_TABS */ |
| 631 | } |
| 632 | |
| 633 | if (isprint (c)) |
| 634 | return (1); |
| 635 | else |
| 636 | return (2); |
| 637 | } |
| 638 | |
| 639 | /* How to print things in the "echo-area". The prompt is treated as a |
| 640 | mini-modeline. */ |
| 641 | |
| 642 | #if defined (HAVE_VARARGS_H) |
| 643 | rl_message (va_alist) |
| 644 | va_dcl |
| 645 | { |
| 646 | char *format; |
| 647 | va_list args; |
| 648 | |
| 649 | va_start (args); |
| 650 | format = va_arg (args, char *); |
| 651 | vsprintf (msg_buf, format, args); |
| 652 | va_end (args); |
| 653 | |
| 654 | rl_display_prompt = msg_buf; |
| 655 | rl_redisplay (); |
| 656 | } |
| 657 | #else /* !HAVE_VARARGS_H */ |
| 658 | rl_message (format, arg1, arg2) |
| 659 | char *format; |
| 660 | { |
| 661 | sprintf (msg_buf, format, arg1, arg2); |
| 662 | rl_display_prompt = msg_buf; |
| 663 | rl_redisplay (); |
| 664 | } |
| 665 | #endif /* !HAVE_VARARGS_H */ |
| 666 | |
| 667 | /* How to clear things from the "echo-area". */ |
| 668 | rl_clear_message () |
| 669 | { |
| 670 | rl_display_prompt = rl_prompt; |
| 671 | rl_redisplay (); |
| 672 | } |
| 673 | |
| 674 | rl_reset_line_state () |
| 675 | { |
| 676 | rl_on_new_line (); |
| 677 | |
| 678 | rl_display_prompt = rl_prompt ? rl_prompt : ""; |
| 679 | forced_display = 1; |
| 680 | } |
| 681 | |
| 682 | /* Quick redisplay hack when erasing characters at the end of the line. */ |
| 683 | void |
| 684 | _rl_erase_at_end_of_line (l) |
| 685 | int l; |
| 686 | { |
| 687 | register int i; |
| 688 | |
| 689 | backspace (l); |
| 690 | for (i = 0; i < l; i++) |
| 691 | putc (' ', rl_outstream); |
| 692 | backspace (l); |
| 693 | for (i = 0; i < l; i++) |
| 694 | visible_line[--_rl_last_c_pos] = '\0'; |
| 695 | rl_display_fixed++; |
| 696 | } |
| 697 | |
| 698 | /* Clear to the end of the line. COUNT is the minimum |
| 699 | number of character spaces to clear, */ |
| 700 | static void |
| 701 | clear_to_eol (count) |
| 702 | int count; |
| 703 | { |
| 704 | #ifndef __GO32__ |
| 705 | if (term_clreol) |
| 706 | { |
| 707 | tputs (term_clreol, 1, _rl_output_character_function); |
| 708 | } |
| 709 | else |
| 710 | #endif /* !__GO32__ */ |
| 711 | { |
| 712 | register int i; |
| 713 | |
| 714 | /* Do one more character space. */ |
| 715 | count++; |
| 716 | |
| 717 | for (i = 0; i < count; i++) |
| 718 | putc (' ', rl_outstream); |
| 719 | |
| 720 | backspace (count); |
| 721 | } |
| 722 | } |
| 723 | /* Insert COUNT characters from STRING to the output stream. */ |
| 724 | static void |
| 725 | insert_some_chars (string, count) |
| 726 | char *string; |
| 727 | int count; |
| 728 | { |
| 729 | #ifdef __GO32__ |
| 730 | int row, col, width; |
| 731 | char *row_start; |
| 732 | |
| 733 | ScreenGetCursor (&row, &col); |
| 734 | width = ScreenCols (); |
| 735 | row_start = ScreenPrimary + (row * width); |
| 736 | memcpy (row_start + col + count, row_start + col, width - col - count); |
| 737 | /* Place the text on the screen. */ |
| 738 | _rl_output_some_chars (string, count); |
| 739 | #else /* __GO32__ */ |
| 740 | /* If IC is defined, then we do not have to "enter" insert mode. */ |
| 741 | if (term_IC) |
| 742 | { |
| 743 | char *tgoto (), *buffer; |
| 744 | buffer = tgoto (term_IC, 0, count); |
| 745 | tputs (buffer, 1, _rl_output_character_function); |
| 746 | _rl_output_some_chars (string, count); |
| 747 | } |
| 748 | else |
| 749 | { |
| 750 | register int i; |
| 751 | |
| 752 | /* If we have to turn on insert-mode, then do so. */ |
| 753 | if (term_im && *term_im) |
| 754 | tputs (term_im, 1, _rl_output_character_function); |
| 755 | |
| 756 | /* If there is a special command for inserting characters, then |
| 757 | use that first to open up the space. */ |
| 758 | if (term_ic && *term_ic) |
| 759 | { |
| 760 | for (i = count; i--; ) |
| 761 | tputs (term_ic, 1, _rl_output_character_function); |
| 762 | } |
| 763 | |
| 764 | /* Print the text. */ |
| 765 | _rl_output_some_chars (string, count); |
| 766 | |
| 767 | /* If there is a string to turn off insert mode, we had best use |
| 768 | it now. */ |
| 769 | if (term_ei && *term_ei) |
| 770 | tputs (term_ei, 1, _rl_output_character_function); |
| 771 | } |
| 772 | #endif /* __GO32__ */ |
| 773 | } |
| 774 | |
| 775 | /* Delete COUNT characters from the display line. */ |
| 776 | static void |
| 777 | delete_chars (count) |
| 778 | int count; |
| 779 | { |
| 780 | #if defined (__GO32__) |
| 781 | int row, col, width; |
| 782 | char *row_start; |
| 783 | |
| 784 | ScreenGetCursor (&row, &col); |
| 785 | width = ScreenCols (); |
| 786 | row_start = ScreenPrimary + (row * width); |
| 787 | memcpy (row_start + col, row_start + col + count, width - col - count); |
| 788 | memset (row_start + width - count, 0, count * 2); |
| 789 | #else /* !__GO32__ */ |
| 790 | if (count > screenwidth) |
| 791 | return; |
| 792 | |
| 793 | if (term_DC && *term_DC) |
| 794 | { |
| 795 | char *tgoto (), *buffer; |
| 796 | buffer = tgoto (term_DC, 0, count); |
| 797 | tputs (buffer, 1, _rl_output_character_function); |
| 798 | } |
| 799 | else |
| 800 | { |
| 801 | if (term_dc && *term_dc) |
| 802 | while (count--) |
| 803 | tputs (term_dc, 1, _rl_output_character_function); |
| 804 | } |
| 805 | #endif /* !__GO32__ */ |
| 806 | } |