| File: | src/gnu/usr.bin/texinfo/info/display.c |
| Warning: | line 388, column 15 Value stored to 'begin' is never read |
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| 1 | /* display.c -- How to display Info windows. |
| 2 | $Id: display.c,v 1.4 2006/07/17 16:12:36 espie Exp $ |
| 3 | |
| 4 | Copyright (C) 1993, 1997, 2003, 2004 Free Software Foundation, Inc. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | |
| 20 | Originally written by Brian Fox (bfox@ai.mit.edu). */ |
| 21 | |
| 22 | #include "info.h" |
| 23 | #include "display.h" |
| 24 | |
| 25 | extern int info_any_buffered_input_p (void); /* Found in session.c. */ |
| 26 | |
| 27 | static void free_display (DISPLAY_LINE **display); |
| 28 | static DISPLAY_LINE **make_display (int width, int height); |
| 29 | |
| 30 | void handle_tag (char *tag); |
| 31 | void handle_tag_start (char *tag); |
| 32 | void handle_tag_end (char *tag); |
| 33 | |
| 34 | /* An array of display lines which tell us what is currently visible on |
| 35 | the display. */ |
| 36 | DISPLAY_LINE **the_display = (DISPLAY_LINE **)NULL((void *)0); |
| 37 | |
| 38 | /* Non-zero means do no output. */ |
| 39 | int display_inhibited = 0; |
| 40 | |
| 41 | /* Initialize THE_DISPLAY to WIDTH and HEIGHT, with nothing in it. */ |
| 42 | void |
| 43 | display_initialize_display (int width, int height) |
| 44 | { |
| 45 | free_display (the_display); |
| 46 | the_display = make_display (width, height); |
| 47 | display_clear_display (the_display); |
| 48 | } |
| 49 | |
| 50 | /* Clear all of the lines in DISPLAY making the screen blank. */ |
| 51 | void |
| 52 | display_clear_display (DISPLAY_LINE **display) |
| 53 | { |
| 54 | register int i; |
| 55 | |
| 56 | for (i = 0; display[i]; i++) |
| 57 | { |
| 58 | display[i]->text[0] = '\0'; |
| 59 | display[i]->textlen = 0; |
| 60 | display[i]->inverse = 0; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | /* Non-zero if we didn't completely redisplay a window. */ |
| 65 | int display_was_interrupted_p = 0; |
| 66 | |
| 67 | /* Update the windows pointed to by WINDOW in the_display. This actually |
| 68 | writes the text on the screen. */ |
| 69 | void |
| 70 | display_update_display (WINDOW *window) |
| 71 | { |
| 72 | register WINDOW *win; |
| 73 | |
| 74 | display_was_interrupted_p = 0; |
| 75 | |
| 76 | /* For every window in the list, check contents against the display. */ |
| 77 | for (win = window; win; win = win->next) |
| 78 | { |
| 79 | /* Only re-display visible windows which need updating. */ |
| 80 | if (((win->flags & W_WindowVisible0x04) == 0) || |
| 81 | ((win->flags & W_UpdateWindow0x01) == 0) || |
| 82 | (win->height == 0)) |
| 83 | continue; |
| 84 | |
| 85 | display_update_one_window (win); |
| 86 | if (display_was_interrupted_p) |
| 87 | break; |
| 88 | } |
| 89 | |
| 90 | /* Always update the echo area. */ |
| 91 | display_update_one_window (the_echo_area); |
| 92 | } |
| 93 | |
| 94 | void |
| 95 | handle_tag_start (char *tag) |
| 96 | { |
| 97 | /* TODO really handle this tag. */ |
| 98 | return; |
| 99 | } |
| 100 | |
| 101 | void |
| 102 | handle_tag_end (char *tag) |
| 103 | { |
| 104 | /* TODO really handle this tag. */ |
| 105 | return; |
| 106 | } |
| 107 | |
| 108 | void |
| 109 | handle_tag (char *tag) |
| 110 | { |
| 111 | if (tag[0] == '/') |
| 112 | { |
| 113 | tag++; |
| 114 | handle_tag_end (tag); |
| 115 | } |
| 116 | else |
| 117 | handle_tag_start (tag); |
| 118 | } |
| 119 | |
| 120 | /* Display WIN on the_display. Unlike display_update_display (), this |
| 121 | function only does one window. */ |
| 122 | void |
| 123 | display_update_one_window (WINDOW *win) |
| 124 | { |
| 125 | register char *nodetext; /* Current character to display. */ |
| 126 | register char *last_node_char; /* Position of the last character in node. */ |
| 127 | register int i; /* General use index. */ |
| 128 | char *printed_line; /* Buffer for a printed line. */ |
| 129 | int pl_index = 0; /* Index into PRINTED_LINE. */ |
| 130 | int line_index = 0; /* Number of lines done so far. */ |
| 131 | int pl_ignore = 0; /* How many chars use zero width on screen. */ |
| 132 | int allocated_win_width; |
| 133 | DISPLAY_LINE **display = the_display; |
| 134 | |
| 135 | /* If display is inhibited, that counts as an interrupted display. */ |
| 136 | if (display_inhibited) |
| 137 | display_was_interrupted_p = 1; |
| 138 | |
| 139 | /* If the window has no height, or display is inhibited, quit now. */ |
| 140 | if (!win->height || display_inhibited) |
| 141 | return; |
| 142 | |
| 143 | /* If the window's first row doesn't appear in the_screen, then it |
| 144 | cannot be displayed. This can happen when the_echo_area is the |
| 145 | window to be displayed, and the screen has shrunk to less than one |
| 146 | line. */ |
| 147 | if ((win->first_row < 0) || (win->first_row > the_screen->height)) |
| 148 | return; |
| 149 | |
| 150 | /* Print each line in the window into our local buffer, and then |
| 151 | check the contents of that buffer against the display. If they |
| 152 | differ, update the display. */ |
| 153 | allocated_win_width = win->width + 1; |
| 154 | printed_line = (char *)xmalloc (allocated_win_width); |
| 155 | |
| 156 | if (!win->node || !win->line_starts) |
| 157 | goto done_with_node_display; |
| 158 | |
| 159 | nodetext = win->line_starts[win->pagetop]; |
| 160 | last_node_char = win->node->contents + win->node->nodelen; |
| 161 | |
| 162 | for (; nodetext < last_node_char; nodetext++) |
| 163 | { |
| 164 | char *rep = NULL((void *)0), *rep_carried_over, rep_temp[2]; |
| 165 | int replen; |
| 166 | |
| 167 | if (isprint (*nodetext)) |
| 168 | { |
| 169 | rep_temp[0] = *nodetext; |
| 170 | replen = 1; |
| 171 | rep_temp[1] = '\0'; |
| 172 | rep = rep_temp; |
| 173 | } |
| 174 | else |
| 175 | { |
| 176 | if (*nodetext == '\r' || *nodetext == '\n') |
| 177 | { |
| 178 | replen = win->width - pl_index + pl_ignore; |
| 179 | } |
| 180 | else if (*nodetext == '\0' |
| 181 | && (nodetext + 2) < last_node_char |
| 182 | && *(nodetext + 1) == '\b' |
| 183 | && *(nodetext + 2) == '[') |
| 184 | { |
| 185 | /* Found new style tag/cookie \0\b[ |
| 186 | Read until the closing tag \0\b] */ |
| 187 | int element_len = 0; |
| 188 | char *element; |
| 189 | |
| 190 | /* Skip the escapes. */ |
| 191 | nodetext += 3; |
| 192 | |
| 193 | while (!(*nodetext == '\0' |
| 194 | && *(nodetext + 1) == '\b' |
| 195 | && *(nodetext + 2) == ']')) |
| 196 | { |
| 197 | nodetext++; |
| 198 | element_len++; |
| 199 | } |
| 200 | |
| 201 | element = (char *) malloc (element_len + 1); |
| 202 | strncpy (element, nodetext - element_len, element_len); |
| 203 | |
| 204 | /* Skip the escapes. */ |
| 205 | nodetext += 2; |
| 206 | pl_ignore += element_len + 5; |
| 207 | /* Append string terminator. */ |
| 208 | element[element_len] = '\0'; |
| 209 | |
| 210 | handle_tag (element); |
| 211 | |
| 212 | /* Over and out */ |
| 213 | free (element); |
| 214 | |
| 215 | continue; |
| 216 | } |
| 217 | else |
| 218 | { |
| 219 | rep = printed_representation (*nodetext, pl_index); |
| 220 | replen = strlen (rep); |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | /* Support ANSI escape sequences under -R. */ |
| 225 | if (raw_escapes_p |
| 226 | && *nodetext == '\033' |
| 227 | && nodetext[1] == '[' |
| 228 | && isdigit (nodetext[2])) |
| 229 | { |
| 230 | if (nodetext[3] == 'm') |
| 231 | pl_ignore += 4; |
| 232 | else if (isdigit (nodetext[3]) && nodetext[4] == 'm') |
| 233 | pl_ignore += 5; |
| 234 | } |
| 235 | while (pl_index + 2 >= allocated_win_width - 1) |
| 236 | { |
| 237 | allocated_win_width *= 2; |
| 238 | printed_line = (char *)xrealloc (printed_line, allocated_win_width); |
| 239 | } |
| 240 | |
| 241 | /* If this character can be printed without passing the width of |
| 242 | the line, then stuff it into the line. */ |
| 243 | if (replen + pl_index < win->width + pl_ignore) |
| 244 | { |
| 245 | /* Optimize if possible. */ |
| 246 | if (replen == 1) |
| 247 | { |
| 248 | printed_line[pl_index++] = *rep; |
| 249 | } |
| 250 | else |
| 251 | { |
| 252 | for (i = 0; i < replen; i++) |
| 253 | printed_line[pl_index++] = rep[i]; |
| 254 | } |
| 255 | } |
| 256 | else |
| 257 | { |
| 258 | DISPLAY_LINE *entry; |
| 259 | |
| 260 | /* If this character cannot be printed in this line, we have |
| 261 | found the end of this line as it would appear on the screen. |
| 262 | Carefully print the end of the line, and then compare. */ |
| 263 | if (*nodetext == '\n' || *nodetext == '\r' || *nodetext == '\t') |
| 264 | { |
| 265 | printed_line[pl_index] = '\0'; |
| 266 | rep_carried_over = (char *)NULL((void *)0); |
| 267 | } |
| 268 | else |
| 269 | { |
| 270 | /* The printed representation of this character extends into |
| 271 | the next line. Remember the offset of the last character |
| 272 | printed out of REP so that we can carry the character over |
| 273 | to the next line. */ |
| 274 | for (i = 0; pl_index < (win->width + pl_ignore - 1);) |
| 275 | printed_line[pl_index++] = rep[i++]; |
| 276 | |
| 277 | rep_carried_over = rep + i; |
| 278 | |
| 279 | /* If printing the last character in this window couldn't |
| 280 | possibly cause the screen to scroll, place a backslash |
| 281 | in the rightmost column. */ |
| 282 | if (1 + line_index + win->first_row < the_screen->height) |
| 283 | { |
| 284 | if (win->flags & W_NoWrap0x10) |
| 285 | printed_line[pl_index++] = '$'; |
| 286 | else |
| 287 | printed_line[pl_index++] = '\\'; |
| 288 | } |
| 289 | printed_line[pl_index] = '\0'; |
| 290 | } |
| 291 | |
| 292 | /* We have the exact line as it should appear on the screen. |
| 293 | Check to see if this line matches the one already appearing |
| 294 | on the screen. */ |
| 295 | entry = display[line_index + win->first_row]; |
| 296 | |
| 297 | /* If the screen line is inversed, then we have to clear |
| 298 | the line from the screen first. Why, I don't know. |
| 299 | (But don't do this if we have no visible entries, as can |
| 300 | happen if the window is shrunk very small.) */ |
| 301 | if ((entry && entry->inverse) |
| 302 | /* Need to erase the line if it has escape sequences. */ |
| 303 | || (raw_escapes_p && strchr (entry->text, '\033') != 0)) |
| 304 | { |
| 305 | terminal_goto_xy (0, line_index + win->first_row); |
| 306 | terminal_clear_to_eol (); |
| 307 | entry->inverse = 0; |
| 308 | entry->text[0] = '\0'; |
| 309 | entry->textlen = 0; |
| 310 | } |
| 311 | |
| 312 | /* Find the offset where these lines differ. */ |
| 313 | for (i = 0; i < pl_index; i++) |
| 314 | if (printed_line[i] != entry->text[i]) |
| 315 | break; |
| 316 | |
| 317 | /* If the lines are not the same length, or if they differed |
| 318 | at all, we must do some redrawing. */ |
| 319 | if ((i != pl_index) || (pl_index != entry->textlen)) |
| 320 | { |
| 321 | /* Move to the proper point on the terminal. */ |
| 322 | terminal_goto_xy (i, line_index + win->first_row); |
| 323 | |
| 324 | /* If there is any text to print, print it. */ |
| 325 | if (i != pl_index) |
| 326 | terminal_put_text (printed_line + i); |
| 327 | |
| 328 | /* If the printed text didn't extend all the way to the edge |
| 329 | of the window, and text was appearing between here and the |
| 330 | edge of the window, clear from here to the end of the line. */ |
| 331 | if ((pl_index < win->width + pl_ignore |
| 332 | && pl_index < entry->textlen) |
| 333 | || (entry->inverse)) |
| 334 | terminal_clear_to_eol (); |
| 335 | |
| 336 | fflush (stdout(&__sF[1])); |
| 337 | |
| 338 | /* Update the display text buffer. */ |
| 339 | if (strlen (printed_line) > (unsigned int) screenwidth) |
| 340 | /* printed_line[] can include more than screenwidth |
| 341 | characters if we are under -R and there are escape |
| 342 | sequences in it. However, entry->text was |
| 343 | allocated (in display_initialize_display) for |
| 344 | screenwidth characters only. */ |
| 345 | entry->text = xrealloc (entry->text, strlen (printed_line)+1); |
| 346 | strcpy (entry->text + i, printed_line + i); |
| 347 | entry->textlen = pl_index; |
| 348 | |
| 349 | /* Lines showing node text are not in inverse. Only modelines |
| 350 | have that distinction. */ |
| 351 | entry->inverse = 0; |
| 352 | } |
| 353 | |
| 354 | /* We have done at least one line. Increment our screen line |
| 355 | index, and check against the bottom of the window. */ |
| 356 | if (++line_index == win->height) |
| 357 | break; |
| 358 | |
| 359 | /* A line has been displayed, and the screen reflects that state. |
| 360 | If there is typeahead pending, then let that typeahead be read |
| 361 | now, instead of continuing with the display. */ |
| 362 | if (info_any_buffered_input_p ()) |
| 363 | { |
| 364 | free (printed_line); |
| 365 | display_was_interrupted_p = 1; |
| 366 | return; |
| 367 | } |
| 368 | |
| 369 | /* Reset PL_INDEX to the start of the line. */ |
| 370 | pl_index = 0; |
| 371 | pl_ignore = 0; /* this is computed per line */ |
| 372 | |
| 373 | /* If there are characters from REP left to print, stuff them |
| 374 | into the buffer now. */ |
| 375 | if (rep_carried_over) |
| 376 | for (; rep[pl_index]; pl_index++) |
| 377 | printed_line[pl_index] = rep[pl_index]; |
| 378 | |
| 379 | /* If this window has chosen not to wrap lines, skip to the end |
| 380 | of the physical line in the buffer, and start a new line here. */ |
| 381 | if (pl_index && (win->flags & W_NoWrap0x10)) |
| 382 | { |
| 383 | char *begin; |
| 384 | |
| 385 | pl_index = 0; |
| 386 | printed_line[0] = '\0'; |
| 387 | |
| 388 | begin = nodetext; |
Value stored to 'begin' is never read | |
| 389 | |
| 390 | while ((nodetext < last_node_char) && (*nodetext != '\n')) |
| 391 | nodetext++; |
| 392 | } |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | done_with_node_display: |
| 397 | /* We have reached the end of the node or the end of the window. If it |
| 398 | is the end of the node, then clear the lines of the window from here |
| 399 | to the end of the window. */ |
| 400 | for (; line_index < win->height; line_index++) |
| 401 | { |
| 402 | DISPLAY_LINE *entry = display[line_index + win->first_row]; |
| 403 | |
| 404 | /* If this line has text on it then make it go away. */ |
| 405 | if (entry && entry->textlen) |
| 406 | { |
| 407 | entry->textlen = 0; |
| 408 | entry->text[0] = '\0'; |
| 409 | |
| 410 | terminal_goto_xy (0, line_index + win->first_row); |
| 411 | terminal_clear_to_eol (); |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | /* Finally, if this window has a modeline it might need to be redisplayed. |
| 416 | Check the window's modeline against the one in the display, and update |
| 417 | if necessary. */ |
| 418 | if ((win->flags & W_InhibitMode0x08) == 0) |
| 419 | { |
| 420 | window_make_modeline (win); |
| 421 | line_index = win->first_row + win->height; |
| 422 | |
| 423 | /* This display line must both be in inverse, and have the same |
| 424 | contents. */ |
| 425 | if ((!display[line_index]->inverse) || |
| 426 | (strcmp (display[line_index]->text, win->modeline) != 0)) |
| 427 | { |
| 428 | terminal_goto_xy (0, line_index); |
| 429 | terminal_begin_inverse (); |
| 430 | terminal_put_text (win->modeline); |
| 431 | terminal_end_inverse (); |
| 432 | strcpy (display[line_index]->text, win->modeline); |
| 433 | display[line_index]->inverse = 1; |
| 434 | display[line_index]->textlen = strlen (win->modeline); |
| 435 | fflush (stdout(&__sF[1])); |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | /* Okay, this window doesn't need updating anymore. */ |
| 440 | win->flags &= ~W_UpdateWindow0x01; |
| 441 | free (printed_line); |
| 442 | fflush (stdout(&__sF[1])); |
| 443 | } |
| 444 | |
| 445 | /* Scroll the region of the_display starting at START, ending at END, and |
| 446 | moving the lines AMOUNT lines. If AMOUNT is less than zero, the lines |
| 447 | are moved up in the screen, otherwise down. Actually, it is possible |
| 448 | for no scrolling to take place in the case that the terminal doesn't |
| 449 | support it. This doesn't matter to us. */ |
| 450 | void |
| 451 | display_scroll_display (int start, int end, int amount) |
| 452 | { |
| 453 | register int i, last; |
| 454 | DISPLAY_LINE *temp; |
| 455 | |
| 456 | /* If this terminal cannot do scrolling, give up now. */ |
| 457 | if (!terminal_can_scroll) |
| 458 | return; |
| 459 | |
| 460 | /* If there isn't anything displayed on the screen because it is too |
| 461 | small, quit now. */ |
| 462 | if (!the_display[0]) |
| 463 | return; |
| 464 | |
| 465 | /* If there is typeahead pending, then don't actually do any scrolling. */ |
| 466 | if (info_any_buffered_input_p ()) |
| 467 | return; |
| 468 | |
| 469 | /* Do it on the screen. */ |
| 470 | terminal_scroll_terminal (start, end, amount); |
| 471 | |
| 472 | /* Now do it in the display buffer so our contents match the screen. */ |
| 473 | if (amount > 0) |
| 474 | { |
| 475 | last = end + amount; |
| 476 | |
| 477 | /* Shift the lines to scroll right into place. */ |
| 478 | for (i = 0; i < (end - start); i++) |
| 479 | { |
| 480 | temp = the_display[last - i]; |
| 481 | the_display[last - i] = the_display[end - i]; |
| 482 | the_display[end - i] = temp; |
| 483 | } |
| 484 | |
| 485 | /* The lines have been shifted down in the buffer. Clear all of the |
| 486 | lines that were vacated. */ |
| 487 | for (i = start; i != (start + amount); i++) |
| 488 | { |
| 489 | the_display[i]->text[0] = '\0'; |
| 490 | the_display[i]->textlen = 0; |
| 491 | the_display[i]->inverse = 0; |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | if (amount < 0) |
| 496 | { |
| 497 | last = start + amount; |
| 498 | for (i = 0; i < (end - start); i++) |
| 499 | { |
| 500 | temp = the_display[last + i]; |
| 501 | the_display[last + i] = the_display[start + i]; |
| 502 | the_display[start + i] = temp; |
| 503 | } |
| 504 | |
| 505 | /* The lines have been shifted up in the buffer. Clear all of the |
| 506 | lines that are left over. */ |
| 507 | for (i = end + amount; i != end; i++) |
| 508 | { |
| 509 | the_display[i]->text[0] = '\0'; |
| 510 | the_display[i]->textlen = 0; |
| 511 | the_display[i]->inverse = 0; |
| 512 | } |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | /* Try to scroll lines in WINDOW. OLD_PAGETOP is the pagetop of WINDOW before |
| 517 | having had its line starts recalculated. OLD_STARTS is the list of line |
| 518 | starts that used to appear in this window. OLD_COUNT is the number of lines |
| 519 | that appear in the OLD_STARTS array. */ |
| 520 | void |
| 521 | display_scroll_line_starts (WINDOW *window, int old_pagetop, |
| 522 | char **old_starts, int old_count) |
| 523 | { |
| 524 | register int i, old, new; /* Indices into the line starts arrays. */ |
| 525 | int last_new, last_old; /* Index of the last visible line. */ |
| 526 | int old_first, new_first; /* Index of the first changed line. */ |
| 527 | int unchanged_at_top = 0; |
| 528 | int already_scrolled = 0; |
| 529 | |
| 530 | /* Locate the first line which was displayed on the old window. */ |
| 531 | old_first = old_pagetop; |
| 532 | new_first = window->pagetop; |
| 533 | |
| 534 | /* Find the last line currently visible in this window. */ |
| 535 | last_new = window->pagetop + (window->height - 1); |
| 536 | if (last_new > window->line_count) |
| 537 | last_new = window->line_count - 1; |
| 538 | |
| 539 | /* Find the last line which used to be currently visible in this window. */ |
| 540 | last_old = old_pagetop + (window->height - 1); |
| 541 | if (last_old > old_count) |
| 542 | last_old = old_count - 1; |
| 543 | |
| 544 | for (old = old_first, new = new_first; |
| 545 | old < last_old && new < last_new; |
| 546 | old++, new++) |
| 547 | if (old_starts[old] != window->line_starts[new]) |
| 548 | break; |
| 549 | else |
| 550 | unchanged_at_top++; |
| 551 | |
| 552 | /* Loop through the old lines looking for a match in the new lines. */ |
| 553 | for (old = old_first + unchanged_at_top; old < last_old; old++) |
| 554 | { |
| 555 | for (new = new_first; new < last_new; new++) |
| 556 | if (old_starts[old] == window->line_starts[new]) |
| 557 | { |
| 558 | /* Find the extent of the matching lines. */ |
| 559 | for (i = 0; (old + i) < last_old; i++) |
| 560 | if (old_starts[old + i] != window->line_starts[new + i]) |
| 561 | break; |
| 562 | |
| 563 | /* Scroll these lines if there are enough of them. */ |
| 564 | { |
| 565 | int start, end, amount; |
| 566 | |
| 567 | start = (window->first_row |
| 568 | + ((old + already_scrolled) - old_pagetop)); |
| 569 | amount = new - (old + already_scrolled); |
| 570 | end = window->first_row + window->height; |
| 571 | |
| 572 | /* If we are shifting the block of lines down, then the last |
| 573 | AMOUNT lines will become invisible. Thus, don't bother |
| 574 | scrolling them. */ |
| 575 | if (amount > 0) |
| 576 | end -= amount; |
| 577 | |
| 578 | if ((end - start) > 0) |
| 579 | { |
| 580 | display_scroll_display (start, end, amount); |
| 581 | |
| 582 | /* Some lines have been scrolled. Simulate the scrolling |
| 583 | by offsetting the value of the old index. */ |
| 584 | old += i; |
| 585 | already_scrolled += amount; |
| 586 | } |
| 587 | } |
| 588 | } |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | /* Move the screen cursor to directly over the current character in WINDOW. */ |
| 593 | void |
| 594 | display_cursor_at_point (WINDOW *window) |
| 595 | { |
| 596 | int vpos, hpos; |
| 597 | |
| 598 | vpos = window_line_of_point (window) - window->pagetop + window->first_row; |
| 599 | hpos = window_get_cursor_column (window); |
| 600 | terminal_goto_xy (hpos, vpos); |
| 601 | fflush (stdout(&__sF[1])); |
| 602 | } |
| 603 | |
| 604 | /* **************************************************************** */ |
| 605 | /* */ |
| 606 | /* Functions Static to this File */ |
| 607 | /* */ |
| 608 | /* **************************************************************** */ |
| 609 | |
| 610 | /* Make a DISPLAY_LINE ** with width and height. */ |
| 611 | static DISPLAY_LINE ** |
| 612 | make_display (int width, int height) |
| 613 | { |
| 614 | register int i; |
| 615 | DISPLAY_LINE **display; |
| 616 | |
| 617 | display = (DISPLAY_LINE **)xmalloc ((1 + height) * sizeof (DISPLAY_LINE *)); |
| 618 | |
| 619 | for (i = 0; i < height; i++) |
| 620 | { |
| 621 | display[i] = (DISPLAY_LINE *)xmalloc (sizeof (DISPLAY_LINE)); |
| 622 | display[i]->text = (char *)xmalloc (1 + width); |
| 623 | display[i]->textlen = 0; |
| 624 | display[i]->inverse = 0; |
| 625 | } |
| 626 | display[i] = (DISPLAY_LINE *)NULL((void *)0); |
| 627 | return (display); |
| 628 | } |
| 629 | |
| 630 | /* Free the storage allocated to DISPLAY. */ |
| 631 | static void |
| 632 | free_display (DISPLAY_LINE **display) |
| 633 | { |
| 634 | register int i; |
| 635 | register DISPLAY_LINE *display_line; |
| 636 | |
| 637 | if (!display) |
| 638 | return; |
| 639 | |
| 640 | for (i = 0; (display_line = display[i]); i++) |
| 641 | { |
| 642 | free (display_line->text); |
| 643 | free (display_line); |
| 644 | } |
| 645 | free (display); |
| 646 | } |