1 /* $FreeBSD$ */ 2 /* 3 * Copyright (C) 1984-2007 Mark Nudelman 4 * 5 * You may distribute under the terms of either the GNU General Public 6 * License or the Less License, as specified in the README file. 7 * 8 * For more information about less, or for information on how to 9 * contact the author, see the README file. 10 */ 11 12 13 /* 14 * Routines which deal with the characteristics of the terminal. 15 * Uses termcap to be as terminal-independent as possible. 16 */ 17 18 #include "less.h" 19 #include "cmd.h" 20 21 #if MSDOS_COMPILER 22 #include "pckeys.h" 23 #if MSDOS_COMPILER==MSOFTC 24 #include <graph.h> 25 #else 26 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC 27 #include <conio.h> 28 #if MSDOS_COMPILER==DJGPPC 29 #include <pc.h> 30 extern int fd0; 31 #endif 32 #else 33 #if MSDOS_COMPILER==WIN32C 34 #include <windows.h> 35 #endif 36 #endif 37 #endif 38 #include <time.h> 39 40 #else 41 42 #if HAVE_SYS_IOCTL_H 43 #include <sys/ioctl.h> 44 #endif 45 46 #if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS 47 #include <termios.h> 48 #else 49 #if HAVE_TERMIO_H 50 #include <termio.h> 51 #else 52 #if HAVE_SGSTAT_H 53 #include <sgstat.h> 54 #else 55 #include <sgtty.h> 56 #endif 57 #endif 58 #endif 59 60 #if HAVE_TERMCAP_H 61 #include <termcap.h> 62 #endif 63 #ifdef _OSK 64 #include <signal.h> 65 #endif 66 #if OS2 67 #include <sys/signal.h> 68 #include "pckeys.h" 69 #endif 70 #if HAVE_SYS_STREAM_H 71 #include <sys/stream.h> 72 #endif 73 #if HAVE_SYS_PTEM_H 74 #include <sys/ptem.h> 75 #endif 76 77 #endif /* MSDOS_COMPILER */ 78 79 /* 80 * Check for broken termios package that forces you to manually 81 * set the line discipline. 82 */ 83 #ifdef __ultrix__ 84 #define MUST_SET_LINE_DISCIPLINE 1 85 #else 86 #define MUST_SET_LINE_DISCIPLINE 0 87 #endif 88 89 #if OS2 90 #define DEFAULT_TERM "ansi" 91 static char *windowid; 92 #else 93 #define DEFAULT_TERM "unknown" 94 #endif 95 96 #if MSDOS_COMPILER==MSOFTC 97 static int videopages; 98 static long msec_loops; 99 static int flash_created = 0; 100 #define SETCOLORS(fg,bg) { _settextcolor(fg); _setbkcolor(bg); } 101 #endif 102 103 #if MSDOS_COMPILER==BORLANDC 104 static unsigned short *whitescreen; 105 static int flash_created = 0; 106 #endif 107 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC 108 #define _settextposition(y,x) gotoxy(x,y) 109 #define _clearscreen(m) clrscr() 110 #define _outtext(s) cputs(s) 111 #define SETCOLORS(fg,bg) { textcolor(fg); textbackground(bg); } 112 extern int sc_height; 113 #endif 114 115 #if MSDOS_COMPILER==WIN32C 116 struct keyRecord 117 { 118 int ascii; 119 int scan; 120 } currentKey; 121 122 static int keyCount = 0; 123 static WORD curr_attr; 124 static int pending_scancode = 0; 125 static WORD *whitescreen; 126 127 static HANDLE con_out_save = INVALID_HANDLE_VALUE; /* previous console */ 128 static HANDLE con_out_ours = INVALID_HANDLE_VALUE; /* our own */ 129 HANDLE con_out = INVALID_HANDLE_VALUE; /* current console */ 130 131 extern int quitting; 132 static void win32_init_term(); 133 static void win32_deinit_term(); 134 135 #define FG_COLORS (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY) 136 #define BG_COLORS (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY) 137 #define MAKEATTR(fg,bg) ((WORD)((fg)|((bg)<<4))) 138 #define SETCOLORS(fg,bg) { curr_attr = MAKEATTR(fg,bg); \ 139 if (SetConsoleTextAttribute(con_out, curr_attr) == 0) \ 140 error("SETCOLORS failed"); } 141 #endif 142 143 #if MSDOS_COMPILER 144 public int nm_fg_color; /* Color of normal text */ 145 public int nm_bg_color; 146 public int bo_fg_color; /* Color of bold text */ 147 public int bo_bg_color; 148 public int ul_fg_color; /* Color of underlined text */ 149 public int ul_bg_color; 150 public int so_fg_color; /* Color of standout text */ 151 public int so_bg_color; 152 public int bl_fg_color; /* Color of blinking text */ 153 public int bl_bg_color; 154 static int sy_fg_color; /* Color of system text (before less) */ 155 static int sy_bg_color; 156 157 #else 158 159 /* 160 * Strings passed to tputs() to do various terminal functions. 161 */ 162 static char 163 *sc_pad, /* Pad string */ 164 *sc_home, /* Cursor home */ 165 *sc_addline, /* Add line, scroll down following lines */ 166 *sc_lower_left, /* Cursor to last line, first column */ 167 *sc_return, /* Cursor to beginning of current line */ 168 *sc_move, /* General cursor positioning */ 169 *sc_clear, /* Clear screen */ 170 *sc_eol_clear, /* Clear to end of line */ 171 *sc_eos_clear, /* Clear to end of screen */ 172 *sc_s_in, /* Enter standout (highlighted) mode */ 173 *sc_s_out, /* Exit standout mode */ 174 *sc_u_in, /* Enter underline mode */ 175 *sc_u_out, /* Exit underline mode */ 176 *sc_b_in, /* Enter bold mode */ 177 *sc_b_out, /* Exit bold mode */ 178 *sc_bl_in, /* Enter blink mode */ 179 *sc_bl_out, /* Exit blink mode */ 180 *sc_visual_bell, /* Visual bell (flash screen) sequence */ 181 *sc_backspace, /* Backspace cursor */ 182 *sc_s_keypad, /* Start keypad mode */ 183 *sc_e_keypad, /* End keypad mode */ 184 *sc_init, /* Startup terminal initialization */ 185 *sc_deinit; /* Exit terminal de-initialization */ 186 #endif 187 188 static int init_done = 0; 189 190 public int auto_wrap; /* Terminal does \r\n when write past margin */ 191 public int ignaw; /* Terminal ignores \n immediately after wrap */ 192 public int erase_char; /* The user's erase char */ 193 public int erase2_char; /* The user's other erase char */ 194 public int kill_char; /* The user's line-kill char */ 195 public int werase_char; /* The user's word-erase char */ 196 public int sc_width, sc_height; /* Height & width of screen */ 197 public int bo_s_width, bo_e_width; /* Printing width of boldface seq */ 198 public int ul_s_width, ul_e_width; /* Printing width of underline seq */ 199 public int so_s_width, so_e_width; /* Printing width of standout seq */ 200 public int bl_s_width, bl_e_width; /* Printing width of blink seq */ 201 public int above_mem, below_mem; /* Memory retained above/below screen */ 202 public int can_goto_line; /* Can move cursor to any line */ 203 public int clear_bg; /* Clear fills with background color */ 204 public int missing_cap = 0; /* Some capability is missing */ 205 206 static int attrmode = AT_NORMAL; 207 extern int binattr; 208 209 #if !MSDOS_COMPILER 210 static char *cheaper(); 211 static void tmodes(); 212 #endif 213 214 /* 215 * These two variables are sometimes defined in, 216 * and needed by, the termcap library. 217 */ 218 #if MUST_DEFINE_OSPEED 219 extern short ospeed; /* Terminal output baud rate */ 220 extern char PC; /* Pad character */ 221 #endif 222 #ifdef _OSK 223 short ospeed; 224 char PC_, *UP, *BC; 225 #endif 226 227 extern int quiet; /* If VERY_QUIET, use visual bell for bell */ 228 extern int no_back_scroll; 229 extern int swindow; 230 extern int no_init; 231 extern int no_keypad; 232 extern int sigs; 233 extern int wscroll; 234 extern int screen_trashed; 235 extern int tty; 236 extern int top_scroll; 237 extern int oldbot; 238 #if HILITE_SEARCH 239 extern int hilite_search; 240 #endif 241 242 extern char *tgetstr(); 243 extern char *tgoto(); 244 245 246 /* 247 * Change terminal to "raw mode", or restore to "normal" mode. 248 * "Raw mode" means 249 * 1. An outstanding read will complete on receipt of a single keystroke. 250 * 2. Input is not echoed. 251 * 3. On output, \n is mapped to \r\n. 252 * 4. \t is NOT expanded into spaces. 253 * 5. Signal-causing characters such as ctrl-C (interrupt), 254 * etc. are NOT disabled. 255 * It doesn't matter whether an input \n is mapped to \r, or vice versa. 256 */ 257 public void 258 raw_mode(on) 259 int on; 260 { 261 static int curr_on = 0; 262 263 if (on == curr_on) 264 return; 265 erase2_char = '\b'; /* in case OS doesn't know about erase2 */ 266 #if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS 267 { 268 struct termios s; 269 static struct termios save_term; 270 static int saved_term = 0; 271 272 if (on) 273 { 274 /* 275 * Get terminal modes. 276 */ 277 tcgetattr(tty, &s); 278 279 /* 280 * Save modes and set certain variables dependent on modes. 281 */ 282 if (!saved_term) 283 { 284 save_term = s; 285 saved_term = 1; 286 } 287 #if HAVE_OSPEED 288 switch (cfgetospeed(&s)) 289 { 290 #ifdef B0 291 case B0: ospeed = 0; break; 292 #endif 293 #ifdef B50 294 case B50: ospeed = 1; break; 295 #endif 296 #ifdef B75 297 case B75: ospeed = 2; break; 298 #endif 299 #ifdef B110 300 case B110: ospeed = 3; break; 301 #endif 302 #ifdef B134 303 case B134: ospeed = 4; break; 304 #endif 305 #ifdef B150 306 case B150: ospeed = 5; break; 307 #endif 308 #ifdef B200 309 case B200: ospeed = 6; break; 310 #endif 311 #ifdef B300 312 case B300: ospeed = 7; break; 313 #endif 314 #ifdef B600 315 case B600: ospeed = 8; break; 316 #endif 317 #ifdef B1200 318 case B1200: ospeed = 9; break; 319 #endif 320 #ifdef B1800 321 case B1800: ospeed = 10; break; 322 #endif 323 #ifdef B2400 324 case B2400: ospeed = 11; break; 325 #endif 326 #ifdef B4800 327 case B4800: ospeed = 12; break; 328 #endif 329 #ifdef B9600 330 case B9600: ospeed = 13; break; 331 #endif 332 #ifdef EXTA 333 case EXTA: ospeed = 14; break; 334 #endif 335 #ifdef EXTB 336 case EXTB: ospeed = 15; break; 337 #endif 338 #ifdef B57600 339 case B57600: ospeed = 16; break; 340 #endif 341 #ifdef B115200 342 case B115200: ospeed = 17; break; 343 #endif 344 default: ; 345 } 346 #endif 347 erase_char = s.c_cc[VERASE]; 348 #ifdef VERASE2 349 erase2_char = s.c_cc[VERASE2]; 350 #endif 351 kill_char = s.c_cc[VKILL]; 352 #ifdef VWERASE 353 werase_char = s.c_cc[VWERASE]; 354 #else 355 werase_char = CONTROL('W'); 356 #endif 357 358 /* 359 * Set the modes to the way we want them. 360 */ 361 s.c_lflag &= ~(0 362 #ifdef ICANON 363 | ICANON 364 #endif 365 #ifdef ECHO 366 | ECHO 367 #endif 368 #ifdef ECHOE 369 | ECHOE 370 #endif 371 #ifdef ECHOK 372 | ECHOK 373 #endif 374 #if ECHONL 375 | ECHONL 376 #endif 377 ); 378 379 s.c_oflag |= (0 380 #ifdef OXTABS 381 | OXTABS 382 #else 383 #ifdef TAB3 384 | TAB3 385 #else 386 #ifdef XTABS 387 | XTABS 388 #endif 389 #endif 390 #endif 391 #ifdef OPOST 392 | OPOST 393 #endif 394 #ifdef ONLCR 395 | ONLCR 396 #endif 397 ); 398 399 s.c_oflag &= ~(0 400 #ifdef ONOEOT 401 | ONOEOT 402 #endif 403 #ifdef OCRNL 404 | OCRNL 405 #endif 406 #ifdef ONOCR 407 | ONOCR 408 #endif 409 #ifdef ONLRET 410 | ONLRET 411 #endif 412 ); 413 s.c_cc[VMIN] = 1; 414 s.c_cc[VTIME] = 0; 415 #ifdef VLNEXT 416 s.c_cc[VLNEXT] = 0; 417 #endif 418 #ifdef VDSUSP 419 s.c_cc[VDSUSP] = 0; 420 #endif 421 #if MUST_SET_LINE_DISCIPLINE 422 /* 423 * System's termios is broken; need to explicitly 424 * request TERMIODISC line discipline. 425 */ 426 s.c_line = TERMIODISC; 427 #endif 428 } else 429 { 430 /* 431 * Restore saved modes. 432 */ 433 s = save_term; 434 } 435 #if HAVE_FSYNC 436 fsync(tty); 437 #endif 438 tcsetattr(tty, TCSADRAIN, &s); 439 #if MUST_SET_LINE_DISCIPLINE 440 if (!on) 441 { 442 /* 443 * Broken termios *ignores* any line discipline 444 * except TERMIODISC. A different old line discipline 445 * is therefore not restored, yet. Restore the old 446 * line discipline by hand. 447 */ 448 ioctl(tty, TIOCSETD, &save_term.c_line); 449 } 450 #endif 451 } 452 #else 453 #ifdef TCGETA 454 { 455 struct termio s; 456 static struct termio save_term; 457 static int saved_term = 0; 458 459 if (on) 460 { 461 /* 462 * Get terminal modes. 463 */ 464 ioctl(tty, TCGETA, &s); 465 466 /* 467 * Save modes and set certain variables dependent on modes. 468 */ 469 if (!saved_term) 470 { 471 save_term = s; 472 saved_term = 1; 473 } 474 #if HAVE_OSPEED 475 ospeed = s.c_cflag & CBAUD; 476 #endif 477 erase_char = s.c_cc[VERASE]; 478 kill_char = s.c_cc[VKILL]; 479 #ifdef VWERASE 480 werase_char = s.c_cc[VWERASE]; 481 #else 482 werase_char = CONTROL('W'); 483 #endif 484 485 /* 486 * Set the modes to the way we want them. 487 */ 488 s.c_lflag &= ~(ICANON|ECHO|ECHOE|ECHOK|ECHONL); 489 s.c_oflag |= (OPOST|ONLCR|TAB3); 490 s.c_oflag &= ~(OCRNL|ONOCR|ONLRET); 491 s.c_cc[VMIN] = 1; 492 s.c_cc[VTIME] = 0; 493 } else 494 { 495 /* 496 * Restore saved modes. 497 */ 498 s = save_term; 499 } 500 ioctl(tty, TCSETAW, &s); 501 } 502 #else 503 #ifdef TIOCGETP 504 { 505 struct sgttyb s; 506 static struct sgttyb save_term; 507 static int saved_term = 0; 508 509 if (on) 510 { 511 /* 512 * Get terminal modes. 513 */ 514 ioctl(tty, TIOCGETP, &s); 515 516 /* 517 * Save modes and set certain variables dependent on modes. 518 */ 519 if (!saved_term) 520 { 521 save_term = s; 522 saved_term = 1; 523 } 524 #if HAVE_OSPEED 525 ospeed = s.sg_ospeed; 526 #endif 527 erase_char = s.sg_erase; 528 kill_char = s.sg_kill; 529 werase_char = CONTROL('W'); 530 531 /* 532 * Set the modes to the way we want them. 533 */ 534 s.sg_flags |= CBREAK; 535 s.sg_flags &= ~(ECHO|XTABS); 536 } else 537 { 538 /* 539 * Restore saved modes. 540 */ 541 s = save_term; 542 } 543 ioctl(tty, TIOCSETN, &s); 544 } 545 #else 546 #ifdef _OSK 547 { 548 struct sgbuf s; 549 static struct sgbuf save_term; 550 static int saved_term = 0; 551 552 if (on) 553 { 554 /* 555 * Get terminal modes. 556 */ 557 _gs_opt(tty, &s); 558 559 /* 560 * Save modes and set certain variables dependent on modes. 561 */ 562 if (!saved_term) 563 { 564 save_term = s; 565 saved_term = 1; 566 } 567 erase_char = s.sg_bspch; 568 kill_char = s.sg_dlnch; 569 werase_char = CONTROL('W'); 570 571 /* 572 * Set the modes to the way we want them. 573 */ 574 s.sg_echo = 0; 575 s.sg_eofch = 0; 576 s.sg_pause = 0; 577 s.sg_psch = 0; 578 } else 579 { 580 /* 581 * Restore saved modes. 582 */ 583 s = save_term; 584 } 585 _ss_opt(tty, &s); 586 } 587 #else 588 /* MS-DOS, Windows, or OS2 */ 589 #if OS2 590 /* OS2 */ 591 LSIGNAL(SIGINT, SIG_IGN); 592 #endif 593 erase_char = '\b'; 594 #if MSDOS_COMPILER==DJGPPC 595 kill_char = CONTROL('U'); 596 /* 597 * So that when we shell out or run another program, its 598 * stdin is in cooked mode. We do not switch stdin to binary 599 * mode if fd0 is zero, since that means we were called before 600 * tty was reopened in open_getchr, in which case we would be 601 * changing the original stdin device outside less. 602 */ 603 if (fd0 != 0) 604 setmode(0, on ? O_BINARY : O_TEXT); 605 #else 606 kill_char = ESC; 607 #endif 608 werase_char = CONTROL('W'); 609 #endif 610 #endif 611 #endif 612 #endif 613 curr_on = on; 614 } 615 616 #if !MSDOS_COMPILER 617 /* 618 * Some glue to prevent calling termcap functions if tgetent() failed. 619 */ 620 static int hardcopy; 621 622 static char * 623 ltget_env(capname) 624 char *capname; 625 { 626 char name[16]; 627 char *s; 628 629 s = lgetenv("LESS_TERMCAP_DEBUG"); 630 if (s != NULL && *s != '\0') 631 { 632 struct env { struct env *next; char *name; char *value; }; 633 static struct env *envs = NULL; 634 struct env *p; 635 for (p = envs; p != NULL; p = p->next) 636 if (strcmp(p->name, capname) == 0) 637 return p->value; 638 p = (struct env *) ecalloc(1, sizeof(struct env)); 639 p->name = save(capname); 640 p->value = (char *) ecalloc(strlen(capname)+3, sizeof(char)); 641 sprintf(p->value, "<%s>", capname); 642 p->next = envs; 643 envs = p; 644 return p->value; 645 } 646 strcpy(name, "LESS_TERMCAP_"); 647 strcat(name, capname); 648 return (lgetenv(name)); 649 } 650 651 static int 652 ltgetflag(capname) 653 char *capname; 654 { 655 char *s; 656 657 if ((s = ltget_env(capname)) != NULL) 658 return (*s != '\0' && *s != '0'); 659 if (hardcopy) 660 return (0); 661 return (tgetflag(capname)); 662 } 663 664 static int 665 ltgetnum(capname) 666 char *capname; 667 { 668 char *s; 669 670 if ((s = ltget_env(capname)) != NULL) 671 return (atoi(s)); 672 if (hardcopy) 673 return (-1); 674 return (tgetnum(capname)); 675 } 676 677 static char * 678 ltgetstr(capname, pp) 679 char *capname; 680 char **pp; 681 { 682 char *s; 683 684 if ((s = ltget_env(capname)) != NULL) 685 return (s); 686 if (hardcopy) 687 return (NULL); 688 return (tgetstr(capname, pp)); 689 } 690 #endif /* MSDOS_COMPILER */ 691 692 /* 693 * Get size of the output screen. 694 */ 695 public void 696 scrsize() 697 { 698 register char *s; 699 int sys_height; 700 int sys_width; 701 #if !MSDOS_COMPILER 702 int n; 703 #endif 704 705 #define DEF_SC_WIDTH 80 706 #if MSDOS_COMPILER 707 #define DEF_SC_HEIGHT 25 708 #else 709 #define DEF_SC_HEIGHT 24 710 #endif 711 712 713 sys_width = sys_height = 0; 714 715 #if MSDOS_COMPILER==MSOFTC 716 { 717 struct videoconfig w; 718 _getvideoconfig(&w); 719 sys_height = w.numtextrows; 720 sys_width = w.numtextcols; 721 } 722 #else 723 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC 724 { 725 struct text_info w; 726 gettextinfo(&w); 727 sys_height = w.screenheight; 728 sys_width = w.screenwidth; 729 } 730 #else 731 #if MSDOS_COMPILER==WIN32C 732 { 733 CONSOLE_SCREEN_BUFFER_INFO scr; 734 GetConsoleScreenBufferInfo(con_out, &scr); 735 sys_height = scr.srWindow.Bottom - scr.srWindow.Top + 1; 736 sys_width = scr.srWindow.Right - scr.srWindow.Left + 1; 737 } 738 #else 739 #if OS2 740 { 741 int s[2]; 742 _scrsize(s); 743 sys_width = s[0]; 744 sys_height = s[1]; 745 /* 746 * When using terminal emulators for XFree86/OS2, the 747 * _scrsize function does not work well. 748 * Call the scrsize.exe program to get the window size. 749 */ 750 windowid = getenv("WINDOWID"); 751 if (windowid != NULL) 752 { 753 FILE *fd = popen("scrsize", "rt"); 754 if (fd != NULL) 755 { 756 int w, h; 757 fscanf(fd, "%i %i", &w, &h); 758 if (w > 0 && h > 0) 759 { 760 sys_width = w; 761 sys_height = h; 762 } 763 pclose(fd); 764 } 765 } 766 } 767 #else 768 #ifdef TIOCGWINSZ 769 { 770 struct winsize w; 771 if (ioctl(2, TIOCGWINSZ, &w) == 0) 772 { 773 if (w.ws_row > 0) 774 sys_height = w.ws_row; 775 if (w.ws_col > 0) 776 sys_width = w.ws_col; 777 } 778 } 779 #else 780 #ifdef WIOCGETD 781 { 782 struct uwdata w; 783 if (ioctl(2, WIOCGETD, &w) == 0) 784 { 785 if (w.uw_height > 0) 786 sys_height = w.uw_height / w.uw_vs; 787 if (w.uw_width > 0) 788 sys_width = w.uw_width / w.uw_hs; 789 } 790 } 791 #endif 792 #endif 793 #endif 794 #endif 795 #endif 796 #endif 797 798 if (sys_height > 0) 799 sc_height = sys_height; 800 else if ((s = lgetenv("LINES")) != NULL) 801 sc_height = atoi(s); 802 #if !MSDOS_COMPILER 803 else if ((n = ltgetnum("li")) > 0) 804 sc_height = n; 805 #endif 806 else 807 sc_height = DEF_SC_HEIGHT; 808 809 if (sys_width > 0) 810 sc_width = sys_width; 811 else if ((s = lgetenv("COLUMNS")) != NULL) 812 sc_width = atoi(s); 813 #if !MSDOS_COMPILER 814 else if ((n = ltgetnum("co")) > 0) 815 sc_width = n; 816 #endif 817 else 818 sc_width = DEF_SC_WIDTH; 819 } 820 821 #if MSDOS_COMPILER==MSOFTC 822 /* 823 * Figure out how many empty loops it takes to delay a millisecond. 824 */ 825 static void 826 get_clock() 827 { 828 clock_t start; 829 830 /* 831 * Get synchronized at the start of a tick. 832 */ 833 start = clock(); 834 while (clock() == start) 835 ; 836 /* 837 * Now count loops till the next tick. 838 */ 839 start = clock(); 840 msec_loops = 0; 841 while (clock() == start) 842 msec_loops++; 843 /* 844 * Convert from (loops per clock) to (loops per millisecond). 845 */ 846 msec_loops *= CLOCKS_PER_SEC; 847 msec_loops /= 1000; 848 } 849 850 /* 851 * Delay for a specified number of milliseconds. 852 */ 853 static void 854 dummy_func() 855 { 856 static long delay_dummy = 0; 857 delay_dummy++; 858 } 859 860 static void 861 delay(msec) 862 int msec; 863 { 864 long i; 865 866 while (msec-- > 0) 867 { 868 for (i = 0; i < msec_loops; i++) 869 { 870 /* 871 * Make it look like we're doing something here, 872 * so the optimizer doesn't remove the whole loop. 873 */ 874 dummy_func(); 875 } 876 } 877 } 878 #endif 879 880 /* 881 * Return the characters actually input by a "special" key. 882 */ 883 public char * 884 special_key_str(key) 885 int key; 886 { 887 static char tbuf[40]; 888 char *s; 889 #if MSDOS_COMPILER || OS2 890 static char k_right[] = { '\340', PCK_RIGHT, 0 }; 891 static char k_left[] = { '\340', PCK_LEFT, 0 }; 892 static char k_ctl_right[] = { '\340', PCK_CTL_RIGHT, 0 }; 893 static char k_ctl_left[] = { '\340', PCK_CTL_LEFT, 0 }; 894 static char k_insert[] = { '\340', PCK_INSERT, 0 }; 895 static char k_delete[] = { '\340', PCK_DELETE, 0 }; 896 static char k_ctl_delete[] = { '\340', PCK_CTL_DELETE, 0 }; 897 static char k_ctl_backspace[] = { '\177', 0 }; 898 static char k_home[] = { '\340', PCK_HOME, 0 }; 899 static char k_end[] = { '\340', PCK_END, 0 }; 900 static char k_up[] = { '\340', PCK_UP, 0 }; 901 static char k_down[] = { '\340', PCK_DOWN, 0 }; 902 static char k_backtab[] = { '\340', PCK_SHIFT_TAB, 0 }; 903 static char k_pagedown[] = { '\340', PCK_PAGEDOWN, 0 }; 904 static char k_pageup[] = { '\340', PCK_PAGEUP, 0 }; 905 static char k_f1[] = { '\340', PCK_F1, 0 }; 906 #endif 907 #if !MSDOS_COMPILER 908 char *sp = tbuf; 909 #endif 910 911 switch (key) 912 { 913 #if OS2 914 /* 915 * If windowid is not NULL, assume less is executed in 916 * the XFree86 environment. 917 */ 918 case SK_RIGHT_ARROW: 919 s = windowid ? ltgetstr("kr", &sp) : k_right; 920 break; 921 case SK_LEFT_ARROW: 922 s = windowid ? ltgetstr("kl", &sp) : k_left; 923 break; 924 case SK_UP_ARROW: 925 s = windowid ? ltgetstr("ku", &sp) : k_up; 926 break; 927 case SK_DOWN_ARROW: 928 s = windowid ? ltgetstr("kd", &sp) : k_down; 929 break; 930 case SK_PAGE_UP: 931 s = windowid ? ltgetstr("kP", &sp) : k_pageup; 932 break; 933 case SK_PAGE_DOWN: 934 s = windowid ? ltgetstr("kN", &sp) : k_pagedown; 935 break; 936 case SK_HOME: 937 s = windowid ? ltgetstr("kh", &sp) : k_home; 938 break; 939 case SK_END: 940 s = windowid ? ltgetstr("@7", &sp) : k_end; 941 break; 942 case SK_DELETE: 943 if (windowid) 944 { 945 s = ltgetstr("kD", &sp); 946 if (s == NULL) 947 { 948 tbuf[0] = '\177'; 949 tbuf[1] = '\0'; 950 s = tbuf; 951 } 952 } else 953 s = k_delete; 954 break; 955 #endif 956 #if MSDOS_COMPILER 957 case SK_RIGHT_ARROW: 958 s = k_right; 959 break; 960 case SK_LEFT_ARROW: 961 s = k_left; 962 break; 963 case SK_UP_ARROW: 964 s = k_up; 965 break; 966 case SK_DOWN_ARROW: 967 s = k_down; 968 break; 969 case SK_PAGE_UP: 970 s = k_pageup; 971 break; 972 case SK_PAGE_DOWN: 973 s = k_pagedown; 974 break; 975 case SK_HOME: 976 s = k_home; 977 break; 978 case SK_END: 979 s = k_end; 980 break; 981 case SK_DELETE: 982 s = k_delete; 983 break; 984 #endif 985 #if MSDOS_COMPILER || OS2 986 case SK_INSERT: 987 s = k_insert; 988 break; 989 case SK_CTL_LEFT_ARROW: 990 s = k_ctl_left; 991 break; 992 case SK_CTL_RIGHT_ARROW: 993 s = k_ctl_right; 994 break; 995 case SK_CTL_BACKSPACE: 996 s = k_ctl_backspace; 997 break; 998 case SK_CTL_DELETE: 999 s = k_ctl_delete; 1000 break; 1001 case SK_F1: 1002 s = k_f1; 1003 break; 1004 case SK_BACKTAB: 1005 s = k_backtab; 1006 break; 1007 #else 1008 case SK_RIGHT_ARROW: 1009 s = ltgetstr("kr", &sp); 1010 break; 1011 case SK_LEFT_ARROW: 1012 s = ltgetstr("kl", &sp); 1013 break; 1014 case SK_UP_ARROW: 1015 s = ltgetstr("ku", &sp); 1016 break; 1017 case SK_DOWN_ARROW: 1018 s = ltgetstr("kd", &sp); 1019 break; 1020 case SK_PAGE_UP: 1021 s = ltgetstr("kP", &sp); 1022 break; 1023 case SK_PAGE_DOWN: 1024 s = ltgetstr("kN", &sp); 1025 break; 1026 case SK_HOME: 1027 s = ltgetstr("kh", &sp); 1028 break; 1029 case SK_END: 1030 s = ltgetstr("@7", &sp); 1031 break; 1032 case SK_DELETE: 1033 s = ltgetstr("kD", &sp); 1034 if (s == NULL) 1035 { 1036 tbuf[0] = '\177'; 1037 tbuf[1] = '\0'; 1038 s = tbuf; 1039 } 1040 break; 1041 #endif 1042 case SK_CONTROL_K: 1043 tbuf[0] = CONTROL('K'); 1044 tbuf[1] = '\0'; 1045 s = tbuf; 1046 break; 1047 default: 1048 return (NULL); 1049 } 1050 return (s); 1051 } 1052 1053 /* 1054 * Get terminal capabilities via termcap. 1055 */ 1056 public void 1057 get_term() 1058 { 1059 #if MSDOS_COMPILER 1060 auto_wrap = 1; 1061 ignaw = 0; 1062 can_goto_line = 1; 1063 clear_bg = 1; 1064 /* 1065 * Set up default colors. 1066 * The xx_s_width and xx_e_width vars are already initialized to 0. 1067 */ 1068 #if MSDOS_COMPILER==MSOFTC 1069 sy_bg_color = _getbkcolor(); 1070 sy_fg_color = _gettextcolor(); 1071 get_clock(); 1072 #else 1073 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC 1074 { 1075 struct text_info w; 1076 gettextinfo(&w); 1077 sy_bg_color = (w.attribute >> 4) & 0x0F; 1078 sy_fg_color = (w.attribute >> 0) & 0x0F; 1079 } 1080 #else 1081 #if MSDOS_COMPILER==WIN32C 1082 { 1083 DWORD nread; 1084 CONSOLE_SCREEN_BUFFER_INFO scr; 1085 1086 con_out_save = con_out = GetStdHandle(STD_OUTPUT_HANDLE); 1087 /* 1088 * Always open stdin in binary. Note this *must* be done 1089 * before any file operations have been done on fd0. 1090 */ 1091 SET_BINARY(0); 1092 GetConsoleScreenBufferInfo(con_out, &scr); 1093 ReadConsoleOutputAttribute(con_out, &curr_attr, 1094 1, scr.dwCursorPosition, &nread); 1095 sy_bg_color = (curr_attr & BG_COLORS) >> 4; /* normalize */ 1096 sy_fg_color = curr_attr & FG_COLORS; 1097 } 1098 #endif 1099 #endif 1100 #endif 1101 nm_fg_color = sy_fg_color; 1102 nm_bg_color = sy_bg_color; 1103 bo_fg_color = 11; 1104 bo_bg_color = 0; 1105 ul_fg_color = 9; 1106 ul_bg_color = 0; 1107 so_fg_color = 15; 1108 so_bg_color = 9; 1109 bl_fg_color = 15; 1110 bl_bg_color = 0; 1111 1112 /* 1113 * Get size of the screen. 1114 */ 1115 scrsize(); 1116 pos_init(); 1117 1118 1119 #else /* !MSDOS_COMPILER */ 1120 1121 char *sp; 1122 register char *t1, *t2; 1123 char *term; 1124 char termbuf[TERMBUF_SIZE]; 1125 1126 static char sbuf[TERMSBUF_SIZE]; 1127 1128 #if OS2 1129 /* 1130 * Make sure the termcap database is available. 1131 */ 1132 sp = lgetenv("TERMCAP"); 1133 if (sp == NULL || *sp == '\0') 1134 { 1135 char *termcap; 1136 if ((sp = homefile("termcap.dat")) != NULL) 1137 { 1138 termcap = (char *) ecalloc(strlen(sp)+9, sizeof(char)); 1139 sprintf(termcap, "TERMCAP=%s", sp); 1140 free(sp); 1141 putenv(termcap); 1142 } 1143 } 1144 #endif 1145 /* 1146 * Find out what kind of terminal this is. 1147 */ 1148 if ((term = lgetenv("TERM")) == NULL) 1149 term = DEFAULT_TERM; 1150 hardcopy = 0; 1151 if (tgetent(termbuf, term) != TGETENT_OK) 1152 hardcopy = 1; 1153 if (ltgetflag("hc")) 1154 hardcopy = 1; 1155 1156 /* 1157 * Get size of the screen. 1158 */ 1159 scrsize(); 1160 pos_init(); 1161 1162 auto_wrap = ltgetflag("am"); 1163 ignaw = ltgetflag("xn"); 1164 above_mem = ltgetflag("da"); 1165 below_mem = ltgetflag("db"); 1166 clear_bg = ltgetflag("ut"); 1167 1168 /* 1169 * Assumes termcap variable "sg" is the printing width of: 1170 * the standout sequence, the end standout sequence, 1171 * the underline sequence, the end underline sequence, 1172 * the boldface sequence, and the end boldface sequence. 1173 */ 1174 if ((so_s_width = ltgetnum("sg")) < 0) 1175 so_s_width = 0; 1176 so_e_width = so_s_width; 1177 1178 bo_s_width = bo_e_width = so_s_width; 1179 ul_s_width = ul_e_width = so_s_width; 1180 bl_s_width = bl_e_width = so_s_width; 1181 1182 #if HILITE_SEARCH 1183 if (so_s_width > 0 || so_e_width > 0) 1184 /* 1185 * Disable highlighting by default on magic cookie terminals. 1186 * Turning on highlighting might change the displayed width 1187 * of a line, causing the display to get messed up. 1188 * The user can turn it back on with -g, 1189 * but she won't like the results. 1190 */ 1191 hilite_search = 0; 1192 #endif 1193 1194 /* 1195 * Get various string-valued capabilities. 1196 */ 1197 sp = sbuf; 1198 1199 #if HAVE_OSPEED 1200 sc_pad = ltgetstr("pc", &sp); 1201 if (sc_pad != NULL) 1202 PC = *sc_pad; 1203 #endif 1204 1205 sc_s_keypad = ltgetstr("ks", &sp); 1206 if (sc_s_keypad == NULL) 1207 sc_s_keypad = ""; 1208 sc_e_keypad = ltgetstr("ke", &sp); 1209 if (sc_e_keypad == NULL) 1210 sc_e_keypad = ""; 1211 1212 sc_init = ltgetstr("ti", &sp); 1213 if (sc_init == NULL) 1214 sc_init = ""; 1215 1216 sc_deinit= ltgetstr("te", &sp); 1217 if (sc_deinit == NULL) 1218 sc_deinit = ""; 1219 1220 sc_eol_clear = ltgetstr("ce", &sp); 1221 if (sc_eol_clear == NULL || *sc_eol_clear == '\0') 1222 { 1223 missing_cap = 1; 1224 sc_eol_clear = ""; 1225 } 1226 1227 sc_eos_clear = ltgetstr("cd", &sp); 1228 if (below_mem && (sc_eos_clear == NULL || *sc_eos_clear == '\0')) 1229 { 1230 missing_cap = 1; 1231 sc_eos_clear = ""; 1232 } 1233 1234 sc_clear = ltgetstr("cl", &sp); 1235 if (sc_clear == NULL || *sc_clear == '\0') 1236 { 1237 missing_cap = 1; 1238 sc_clear = "\n\n"; 1239 } 1240 1241 sc_move = ltgetstr("cm", &sp); 1242 if (sc_move == NULL || *sc_move == '\0') 1243 { 1244 /* 1245 * This is not an error here, because we don't 1246 * always need sc_move. 1247 * We need it only if we don't have home or lower-left. 1248 */ 1249 sc_move = ""; 1250 can_goto_line = 0; 1251 } else 1252 can_goto_line = 1; 1253 1254 tmodes("so", "se", &sc_s_in, &sc_s_out, "", "", &sp); 1255 tmodes("us", "ue", &sc_u_in, &sc_u_out, sc_s_in, sc_s_out, &sp); 1256 tmodes("md", "me", &sc_b_in, &sc_b_out, sc_s_in, sc_s_out, &sp); 1257 tmodes("mb", "me", &sc_bl_in, &sc_bl_out, sc_s_in, sc_s_out, &sp); 1258 1259 sc_visual_bell = ltgetstr("vb", &sp); 1260 if (sc_visual_bell == NULL) 1261 sc_visual_bell = ""; 1262 1263 if (ltgetflag("bs")) 1264 sc_backspace = "\b"; 1265 else 1266 { 1267 sc_backspace = ltgetstr("bc", &sp); 1268 if (sc_backspace == NULL || *sc_backspace == '\0') 1269 sc_backspace = "\b"; 1270 } 1271 1272 /* 1273 * Choose between using "ho" and "cm" ("home" and "cursor move") 1274 * to move the cursor to the upper left corner of the screen. 1275 */ 1276 t1 = ltgetstr("ho", &sp); 1277 if (t1 == NULL) 1278 t1 = ""; 1279 if (*sc_move == '\0') 1280 t2 = ""; 1281 else 1282 { 1283 strcpy(sp, tgoto(sc_move, 0, 0)); 1284 t2 = sp; 1285 sp += strlen(sp) + 1; 1286 } 1287 sc_home = cheaper(t1, t2, "|\b^"); 1288 1289 /* 1290 * Choose between using "ll" and "cm" ("lower left" and "cursor move") 1291 * to move the cursor to the lower left corner of the screen. 1292 */ 1293 t1 = ltgetstr("ll", &sp); 1294 if (t1 == NULL) 1295 t1 = ""; 1296 if (*sc_move == '\0') 1297 t2 = ""; 1298 else 1299 { 1300 strcpy(sp, tgoto(sc_move, 0, sc_height-1)); 1301 t2 = sp; 1302 sp += strlen(sp) + 1; 1303 } 1304 sc_lower_left = cheaper(t1, t2, "\r"); 1305 1306 /* 1307 * Get carriage return string. 1308 */ 1309 sc_return = ltgetstr("cr", &sp); 1310 if (sc_return == NULL) 1311 sc_return = "\r"; 1312 1313 /* 1314 * Choose between using "al" or "sr" ("add line" or "scroll reverse") 1315 * to add a line at the top of the screen. 1316 */ 1317 t1 = ltgetstr("al", &sp); 1318 if (t1 == NULL) 1319 t1 = ""; 1320 t2 = ltgetstr("sr", &sp); 1321 if (t2 == NULL) 1322 t2 = ""; 1323 #if OS2 1324 if (*t1 == '\0' && *t2 == '\0') 1325 sc_addline = ""; 1326 else 1327 #endif 1328 if (above_mem) 1329 sc_addline = t1; 1330 else 1331 sc_addline = cheaper(t1, t2, ""); 1332 if (*sc_addline == '\0') 1333 { 1334 /* 1335 * Force repaint on any backward movement. 1336 */ 1337 no_back_scroll = 1; 1338 } 1339 #endif /* MSDOS_COMPILER */ 1340 } 1341 1342 #if !MSDOS_COMPILER 1343 /* 1344 * Return the cost of displaying a termcap string. 1345 * We use the trick of calling tputs, but as a char printing function 1346 * we give it inc_costcount, which just increments "costcount". 1347 * This tells us how many chars would be printed by using this string. 1348 * {{ Couldn't we just use strlen? }} 1349 */ 1350 static int costcount; 1351 1352 /*ARGSUSED*/ 1353 static int 1354 inc_costcount(c) 1355 int c; 1356 { 1357 costcount++; 1358 return (c); 1359 } 1360 1361 static int 1362 cost(t) 1363 char *t; 1364 { 1365 costcount = 0; 1366 tputs(t, sc_height, inc_costcount); 1367 return (costcount); 1368 } 1369 1370 /* 1371 * Return the "best" of the two given termcap strings. 1372 * The best, if both exist, is the one with the lower 1373 * cost (see cost() function). 1374 */ 1375 static char * 1376 cheaper(t1, t2, def) 1377 char *t1, *t2; 1378 char *def; 1379 { 1380 if (*t1 == '\0' && *t2 == '\0') 1381 { 1382 missing_cap = 1; 1383 return (def); 1384 } 1385 if (*t1 == '\0') 1386 return (t2); 1387 if (*t2 == '\0') 1388 return (t1); 1389 if (cost(t1) < cost(t2)) 1390 return (t1); 1391 return (t2); 1392 } 1393 1394 static void 1395 tmodes(incap, outcap, instr, outstr, def_instr, def_outstr, spp) 1396 char *incap; 1397 char *outcap; 1398 char **instr; 1399 char **outstr; 1400 char *def_instr; 1401 char *def_outstr; 1402 char **spp; 1403 { 1404 *instr = ltgetstr(incap, spp); 1405 if (*instr == NULL) 1406 { 1407 /* Use defaults. */ 1408 *instr = def_instr; 1409 *outstr = def_outstr; 1410 return; 1411 } 1412 1413 *outstr = ltgetstr(outcap, spp); 1414 if (*outstr == NULL) 1415 /* No specific out capability; use "me". */ 1416 *outstr = ltgetstr("me", spp); 1417 if (*outstr == NULL) 1418 /* Don't even have "me"; use a null string. */ 1419 *outstr = ""; 1420 } 1421 1422 #endif /* MSDOS_COMPILER */ 1423 1424 1425 /* 1426 * Below are the functions which perform all the 1427 * terminal-specific screen manipulation. 1428 */ 1429 1430 1431 #if MSDOS_COMPILER 1432 1433 #if MSDOS_COMPILER==WIN32C 1434 static void 1435 _settextposition(int row, int col) 1436 { 1437 COORD cpos; 1438 CONSOLE_SCREEN_BUFFER_INFO csbi; 1439 1440 GetConsoleScreenBufferInfo(con_out, &csbi); 1441 cpos.X = csbi.srWindow.Left + (col - 1); 1442 cpos.Y = csbi.srWindow.Top + (row - 1); 1443 SetConsoleCursorPosition(con_out, cpos); 1444 } 1445 #endif 1446 1447 /* 1448 * Initialize the screen to the correct color at startup. 1449 */ 1450 static void 1451 initcolor() 1452 { 1453 SETCOLORS(nm_fg_color, nm_bg_color); 1454 #if 0 1455 /* 1456 * This clears the screen at startup. This is different from 1457 * the behavior of other versions of less. Disable it for now. 1458 */ 1459 char *blanks; 1460 int row; 1461 int col; 1462 1463 /* 1464 * Create a complete, blank screen using "normal" colors. 1465 */ 1466 SETCOLORS(nm_fg_color, nm_bg_color); 1467 blanks = (char *) ecalloc(width+1, sizeof(char)); 1468 for (col = 0; col < sc_width; col++) 1469 blanks[col] = ' '; 1470 blanks[sc_width] = '\0'; 1471 for (row = 0; row < sc_height; row++) 1472 _outtext(blanks); 1473 free(blanks); 1474 #endif 1475 } 1476 #endif 1477 1478 #if MSDOS_COMPILER==WIN32C 1479 1480 /* 1481 * Termcap-like init with a private win32 console. 1482 */ 1483 static void 1484 win32_init_term() 1485 { 1486 CONSOLE_SCREEN_BUFFER_INFO scr; 1487 COORD size; 1488 1489 if (con_out_save == INVALID_HANDLE_VALUE) 1490 return; 1491 1492 GetConsoleScreenBufferInfo(con_out_save, &scr); 1493 1494 if (con_out_ours == INVALID_HANDLE_VALUE) 1495 { 1496 /* 1497 * Create our own screen buffer, so that we 1498 * may restore the original when done. 1499 */ 1500 con_out_ours = CreateConsoleScreenBuffer( 1501 GENERIC_WRITE | GENERIC_READ, 1502 FILE_SHARE_WRITE | FILE_SHARE_READ, 1503 (LPSECURITY_ATTRIBUTES) NULL, 1504 CONSOLE_TEXTMODE_BUFFER, 1505 (LPVOID) NULL); 1506 } 1507 1508 size.X = scr.srWindow.Right - scr.srWindow.Left + 1; 1509 size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1; 1510 SetConsoleScreenBufferSize(con_out_ours, size); 1511 SetConsoleActiveScreenBuffer(con_out_ours); 1512 con_out = con_out_ours; 1513 } 1514 1515 /* 1516 * Restore the startup console. 1517 */ 1518 static void 1519 win32_deinit_term() 1520 { 1521 if (con_out_save == INVALID_HANDLE_VALUE) 1522 return; 1523 if (quitting) 1524 (void) CloseHandle(con_out_ours); 1525 SetConsoleActiveScreenBuffer(con_out_save); 1526 con_out = con_out_save; 1527 } 1528 1529 #endif 1530 1531 /* 1532 * Initialize terminal 1533 */ 1534 public void 1535 init() 1536 { 1537 #if !MSDOS_COMPILER 1538 if (!no_init) 1539 tputs(sc_init, sc_height, putchr); 1540 if (!no_keypad) 1541 tputs(sc_s_keypad, sc_height, putchr); 1542 if (top_scroll) 1543 { 1544 int i; 1545 1546 /* 1547 * This is nice to terminals with no alternate screen, 1548 * but with saved scrolled-off-the-top lines. This way, 1549 * no previous line is lost, but we start with a whole 1550 * screen to ourself. 1551 */ 1552 for (i = 1; i < sc_height; i++) 1553 putchr('\n'); 1554 } 1555 #else 1556 #if MSDOS_COMPILER==WIN32C 1557 if (!no_init) 1558 win32_init_term(); 1559 #endif 1560 initcolor(); 1561 flush(); 1562 #endif 1563 init_done = 1; 1564 } 1565 1566 /* 1567 * Deinitialize terminal 1568 */ 1569 public void 1570 deinit() 1571 { 1572 if (!init_done) 1573 return; 1574 #if !MSDOS_COMPILER 1575 if (!no_keypad) 1576 tputs(sc_e_keypad, sc_height, putchr); 1577 if (!no_init) 1578 tputs(sc_deinit, sc_height, putchr); 1579 #else 1580 /* Restore system colors. */ 1581 SETCOLORS(sy_fg_color, sy_bg_color); 1582 #if MSDOS_COMPILER==WIN32C 1583 if (!no_init) 1584 win32_deinit_term(); 1585 #else 1586 /* Need clreol to make SETCOLORS take effect. */ 1587 clreol(); 1588 #endif 1589 #endif 1590 init_done = 0; 1591 } 1592 1593 /* 1594 * Home cursor (move to upper left corner of screen). 1595 */ 1596 public void 1597 home() 1598 { 1599 #if !MSDOS_COMPILER 1600 tputs(sc_home, 1, putchr); 1601 #else 1602 flush(); 1603 _settextposition(1,1); 1604 #endif 1605 } 1606 1607 /* 1608 * Add a blank line (called with cursor at home). 1609 * Should scroll the display down. 1610 */ 1611 public void 1612 add_line() 1613 { 1614 #if !MSDOS_COMPILER 1615 tputs(sc_addline, sc_height, putchr); 1616 #else 1617 flush(); 1618 #if MSDOS_COMPILER==MSOFTC 1619 _scrolltextwindow(_GSCROLLDOWN); 1620 _settextposition(1,1); 1621 #else 1622 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC 1623 movetext(1,1, sc_width,sc_height-1, 1,2); 1624 gotoxy(1,1); 1625 clreol(); 1626 #else 1627 #if MSDOS_COMPILER==WIN32C 1628 { 1629 CHAR_INFO fillchar; 1630 SMALL_RECT rcSrc, rcClip; 1631 COORD new_org; 1632 CONSOLE_SCREEN_BUFFER_INFO csbi; 1633 1634 GetConsoleScreenBufferInfo(con_out,&csbi); 1635 1636 /* The clip rectangle is the entire visible screen. */ 1637 rcClip.Left = csbi.srWindow.Left; 1638 rcClip.Top = csbi.srWindow.Top; 1639 rcClip.Right = csbi.srWindow.Right; 1640 rcClip.Bottom = csbi.srWindow.Bottom; 1641 1642 /* The source rectangle is the visible screen minus the last line. */ 1643 rcSrc = rcClip; 1644 rcSrc.Bottom--; 1645 1646 /* Move the top left corner of the source window down one row. */ 1647 new_org.X = rcSrc.Left; 1648 new_org.Y = rcSrc.Top + 1; 1649 1650 /* Fill the right character and attributes. */ 1651 fillchar.Char.AsciiChar = ' '; 1652 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color); 1653 fillchar.Attributes = curr_attr; 1654 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar); 1655 _settextposition(1,1); 1656 } 1657 #endif 1658 #endif 1659 #endif 1660 #endif 1661 } 1662 1663 #if 0 1664 /* 1665 * Remove the n topmost lines and scroll everything below it in the 1666 * window upward. This is needed to stop leaking the topmost line 1667 * into the scrollback buffer when we go down-one-line (in WIN32). 1668 */ 1669 public void 1670 remove_top(n) 1671 int n; 1672 { 1673 #if MSDOS_COMPILER==WIN32C 1674 SMALL_RECT rcSrc, rcClip; 1675 CHAR_INFO fillchar; 1676 COORD new_org; 1677 CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */ 1678 1679 if (n >= sc_height - 1) 1680 { 1681 clear(); 1682 home(); 1683 return; 1684 } 1685 1686 flush(); 1687 1688 GetConsoleScreenBufferInfo(con_out, &csbi); 1689 1690 /* Get the extent of all-visible-rows-but-the-last. */ 1691 rcSrc.Left = csbi.srWindow.Left; 1692 rcSrc.Top = csbi.srWindow.Top + n; 1693 rcSrc.Right = csbi.srWindow.Right; 1694 rcSrc.Bottom = csbi.srWindow.Bottom; 1695 1696 /* Get the clip rectangle. */ 1697 rcClip.Left = rcSrc.Left; 1698 rcClip.Top = csbi.srWindow.Top; 1699 rcClip.Right = rcSrc.Right; 1700 rcClip.Bottom = rcSrc.Bottom ; 1701 1702 /* Move the source window up n rows. */ 1703 new_org.X = rcSrc.Left; 1704 new_org.Y = rcSrc.Top - n; 1705 1706 /* Fill the right character and attributes. */ 1707 fillchar.Char.AsciiChar = ' '; 1708 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color); 1709 fillchar.Attributes = curr_attr; 1710 1711 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar); 1712 1713 /* Position cursor on first blank line. */ 1714 goto_line(sc_height - n - 1); 1715 #endif 1716 } 1717 #endif 1718 1719 #if MSDOS_COMPILER==WIN32C 1720 /* 1721 * Clear the screen. 1722 */ 1723 static void 1724 win32_clear() 1725 { 1726 /* 1727 * This will clear only the currently visible rows of the NT 1728 * console buffer, which means none of the precious scrollback 1729 * rows are touched making for faster scrolling. Note that, if 1730 * the window has fewer columns than the console buffer (i.e. 1731 * there is a horizontal scrollbar as well), the entire width 1732 * of the visible rows will be cleared. 1733 */ 1734 COORD topleft; 1735 DWORD nchars; 1736 DWORD winsz; 1737 CONSOLE_SCREEN_BUFFER_INFO csbi; 1738 1739 /* get the number of cells in the current buffer */ 1740 GetConsoleScreenBufferInfo(con_out, &csbi); 1741 winsz = csbi.dwSize.X * (csbi.srWindow.Bottom - csbi.srWindow.Top + 1); 1742 topleft.X = 0; 1743 topleft.Y = csbi.srWindow.Top; 1744 1745 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color); 1746 FillConsoleOutputCharacter(con_out, ' ', winsz, topleft, &nchars); 1747 FillConsoleOutputAttribute(con_out, curr_attr, winsz, topleft, &nchars); 1748 } 1749 1750 /* 1751 * Remove the n topmost lines and scroll everything below it in the 1752 * window upward. 1753 */ 1754 public void 1755 win32_scroll_up(n) 1756 int n; 1757 { 1758 SMALL_RECT rcSrc, rcClip; 1759 CHAR_INFO fillchar; 1760 COORD topleft; 1761 COORD new_org; 1762 DWORD nchars; 1763 DWORD size; 1764 CONSOLE_SCREEN_BUFFER_INFO csbi; 1765 1766 if (n <= 0) 1767 return; 1768 1769 if (n >= sc_height - 1) 1770 { 1771 win32_clear(); 1772 _settextposition(1,1); 1773 return; 1774 } 1775 1776 /* Get the extent of what will remain visible after scrolling. */ 1777 GetConsoleScreenBufferInfo(con_out, &csbi); 1778 rcSrc.Left = csbi.srWindow.Left; 1779 rcSrc.Top = csbi.srWindow.Top + n; 1780 rcSrc.Right = csbi.srWindow.Right; 1781 rcSrc.Bottom = csbi.srWindow.Bottom; 1782 1783 /* Get the clip rectangle. */ 1784 rcClip.Left = rcSrc.Left; 1785 rcClip.Top = csbi.srWindow.Top; 1786 rcClip.Right = rcSrc.Right; 1787 rcClip.Bottom = rcSrc.Bottom ; 1788 1789 /* Move the source text to the top of the screen. */ 1790 new_org.X = rcSrc.Left; 1791 new_org.Y = 0; 1792 1793 /* Fill the right character and attributes. */ 1794 fillchar.Char.AsciiChar = ' '; 1795 fillchar.Attributes = MAKEATTR(nm_fg_color, nm_bg_color); 1796 1797 /* Scroll the window. */ 1798 SetConsoleTextAttribute(con_out, fillchar.Attributes); 1799 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar); 1800 1801 /* Clear remaining lines at bottom. */ 1802 topleft.X = csbi.dwCursorPosition.X; 1803 topleft.Y = rcSrc.Bottom - n; 1804 size = (n * csbi.dwSize.X) + (rcSrc.Right - topleft.X); 1805 FillConsoleOutputCharacter(con_out, ' ', size, topleft, 1806 &nchars); 1807 FillConsoleOutputAttribute(con_out, fillchar.Attributes, size, topleft, 1808 &nchars); 1809 SetConsoleTextAttribute(con_out, curr_attr); 1810 1811 /* Move cursor n lines up from where it was. */ 1812 csbi.dwCursorPosition.Y -= n; 1813 SetConsoleCursorPosition(con_out, csbi.dwCursorPosition); 1814 } 1815 #endif 1816 1817 /* 1818 * Move cursor to lower left corner of screen. 1819 */ 1820 public void 1821 lower_left() 1822 { 1823 #if !MSDOS_COMPILER 1824 tputs(sc_lower_left, 1, putchr); 1825 #else 1826 flush(); 1827 _settextposition(sc_height, 1); 1828 #endif 1829 } 1830 1831 /* 1832 * Move cursor to left position of current line. 1833 */ 1834 public void 1835 line_left() 1836 { 1837 #if !MSDOS_COMPILER 1838 tputs(sc_return, 1, putchr); 1839 #else 1840 int row; 1841 flush(); 1842 #if MSDOS_COMPILER==WIN32C 1843 { 1844 CONSOLE_SCREEN_BUFFER_INFO scr; 1845 GetConsoleScreenBufferInfo(con_out, &scr); 1846 row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1; 1847 } 1848 #else 1849 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC 1850 row = wherey(); 1851 #else 1852 { 1853 struct rccoord tpos = _gettextposition(); 1854 row = tpos.row; 1855 } 1856 #endif 1857 #endif 1858 _settextposition(row, 1); 1859 #endif 1860 } 1861 1862 /* 1863 * Check if the console size has changed and reset internals 1864 * (in lieu of SIGWINCH for WIN32). 1865 */ 1866 public void 1867 check_winch() 1868 { 1869 #if MSDOS_COMPILER==WIN32C 1870 CONSOLE_SCREEN_BUFFER_INFO scr; 1871 COORD size; 1872 1873 if (con_out == INVALID_HANDLE_VALUE) 1874 return; 1875 1876 flush(); 1877 GetConsoleScreenBufferInfo(con_out, &scr); 1878 size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1; 1879 size.X = scr.srWindow.Right - scr.srWindow.Left + 1; 1880 if (size.Y != sc_height || size.X != sc_width) 1881 { 1882 sc_height = size.Y; 1883 sc_width = size.X; 1884 if (!no_init && con_out_ours == con_out) 1885 SetConsoleScreenBufferSize(con_out, size); 1886 pos_init(); 1887 wscroll = (sc_height + 1) / 2; 1888 screen_trashed = 1; 1889 } 1890 #endif 1891 } 1892 1893 /* 1894 * Goto a specific line on the screen. 1895 */ 1896 public void 1897 goto_line(slinenum) 1898 int slinenum; 1899 { 1900 #if !MSDOS_COMPILER 1901 tputs(tgoto(sc_move, 0, slinenum), 1, putchr); 1902 #else 1903 flush(); 1904 _settextposition(slinenum+1, 1); 1905 #endif 1906 } 1907 1908 #if MSDOS_COMPILER==MSOFTC || MSDOS_COMPILER==BORLANDC 1909 /* 1910 * Create an alternate screen which is all white. 1911 * This screen is used to create a "flash" effect, by displaying it 1912 * briefly and then switching back to the normal screen. 1913 * {{ Yuck! There must be a better way to get a visual bell. }} 1914 */ 1915 static void 1916 create_flash() 1917 { 1918 #if MSDOS_COMPILER==MSOFTC 1919 struct videoconfig w; 1920 char *blanks; 1921 int row, col; 1922 1923 _getvideoconfig(&w); 1924 videopages = w.numvideopages; 1925 if (videopages < 2) 1926 { 1927 at_enter(AT_STANDOUT); 1928 at_exit(); 1929 } else 1930 { 1931 _setactivepage(1); 1932 at_enter(AT_STANDOUT); 1933 blanks = (char *) ecalloc(w.numtextcols, sizeof(char)); 1934 for (col = 0; col < w.numtextcols; col++) 1935 blanks[col] = ' '; 1936 for (row = w.numtextrows; row > 0; row--) 1937 _outmem(blanks, w.numtextcols); 1938 _setactivepage(0); 1939 _setvisualpage(0); 1940 free(blanks); 1941 at_exit(); 1942 } 1943 #else 1944 #if MSDOS_COMPILER==BORLANDC 1945 register int n; 1946 1947 whitescreen = (unsigned short *) 1948 malloc(sc_width * sc_height * sizeof(short)); 1949 if (whitescreen == NULL) 1950 return; 1951 for (n = 0; n < sc_width * sc_height; n++) 1952 whitescreen[n] = 0x7020; 1953 #else 1954 #if MSDOS_COMPILER==WIN32C 1955 register int n; 1956 1957 whitescreen = (WORD *) 1958 malloc(sc_height * sc_width * sizeof(WORD)); 1959 if (whitescreen == NULL) 1960 return; 1961 /* Invert the standard colors. */ 1962 for (n = 0; n < sc_width * sc_height; n++) 1963 whitescreen[n] = (WORD)((nm_fg_color << 4) | nm_bg_color); 1964 #endif 1965 #endif 1966 #endif 1967 flash_created = 1; 1968 } 1969 #endif /* MSDOS_COMPILER */ 1970 1971 /* 1972 * Output the "visual bell", if there is one. 1973 */ 1974 public void 1975 vbell() 1976 { 1977 #if !MSDOS_COMPILER 1978 if (*sc_visual_bell == '\0') 1979 return; 1980 tputs(sc_visual_bell, sc_height, putchr); 1981 #else 1982 #if MSDOS_COMPILER==DJGPPC 1983 ScreenVisualBell(); 1984 #else 1985 #if MSDOS_COMPILER==MSOFTC 1986 /* 1987 * Create a flash screen on the second video page. 1988 * Switch to that page, then switch back. 1989 */ 1990 if (!flash_created) 1991 create_flash(); 1992 if (videopages < 2) 1993 return; 1994 _setvisualpage(1); 1995 delay(100); 1996 _setvisualpage(0); 1997 #else 1998 #if MSDOS_COMPILER==BORLANDC 1999 unsigned short *currscreen; 2000 2001 /* 2002 * Get a copy of the current screen. 2003 * Display the flash screen. 2004 * Then restore the old screen. 2005 */ 2006 if (!flash_created) 2007 create_flash(); 2008 if (whitescreen == NULL) 2009 return; 2010 currscreen = (unsigned short *) 2011 malloc(sc_width * sc_height * sizeof(short)); 2012 if (currscreen == NULL) return; 2013 gettext(1, 1, sc_width, sc_height, currscreen); 2014 puttext(1, 1, sc_width, sc_height, whitescreen); 2015 delay(100); 2016 puttext(1, 1, sc_width, sc_height, currscreen); 2017 free(currscreen); 2018 #else 2019 #if MSDOS_COMPILER==WIN32C 2020 /* paint screen with an inverse color */ 2021 clear(); 2022 2023 /* leave it displayed for 100 msec. */ 2024 Sleep(100); 2025 2026 /* restore with a redraw */ 2027 repaint(); 2028 #endif 2029 #endif 2030 #endif 2031 #endif 2032 #endif 2033 } 2034 2035 /* 2036 * Make a noise. 2037 */ 2038 static void 2039 beep() 2040 { 2041 #if !MSDOS_COMPILER 2042 putchr(CONTROL('G')); 2043 #else 2044 #if MSDOS_COMPILER==WIN32C 2045 MessageBeep(0); 2046 #else 2047 write(1, "\7", 1); 2048 #endif 2049 #endif 2050 } 2051 2052 /* 2053 * Ring the terminal bell. 2054 */ 2055 public void 2056 bell() 2057 { 2058 if (quiet == VERY_QUIET) 2059 vbell(); 2060 else 2061 beep(); 2062 } 2063 2064 /* 2065 * Clear the screen. 2066 */ 2067 public void 2068 clear() 2069 { 2070 #if !MSDOS_COMPILER 2071 tputs(sc_clear, sc_height, putchr); 2072 #else 2073 flush(); 2074 #if MSDOS_COMPILER==WIN32C 2075 win32_clear(); 2076 #else 2077 _clearscreen(_GCLEARSCREEN); 2078 #endif 2079 #endif 2080 } 2081 2082 /* 2083 * Clear from the cursor to the end of the cursor's line. 2084 * {{ This must not move the cursor. }} 2085 */ 2086 public void 2087 clear_eol() 2088 { 2089 #if !MSDOS_COMPILER 2090 tputs(sc_eol_clear, 1, putchr); 2091 #else 2092 #if MSDOS_COMPILER==MSOFTC 2093 short top, left; 2094 short bot, right; 2095 struct rccoord tpos; 2096 2097 flush(); 2098 /* 2099 * Save current state. 2100 */ 2101 tpos = _gettextposition(); 2102 _gettextwindow(&top, &left, &bot, &right); 2103 /* 2104 * Set a temporary window to the current line, 2105 * from the cursor's position to the right edge of the screen. 2106 * Then clear that window. 2107 */ 2108 _settextwindow(tpos.row, tpos.col, tpos.row, sc_width); 2109 _clearscreen(_GWINDOW); 2110 /* 2111 * Restore state. 2112 */ 2113 _settextwindow(top, left, bot, right); 2114 _settextposition(tpos.row, tpos.col); 2115 #else 2116 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC 2117 flush(); 2118 clreol(); 2119 #else 2120 #if MSDOS_COMPILER==WIN32C 2121 DWORD nchars; 2122 COORD cpos; 2123 CONSOLE_SCREEN_BUFFER_INFO scr; 2124 2125 flush(); 2126 memset(&scr, 0, sizeof(scr)); 2127 GetConsoleScreenBufferInfo(con_out, &scr); 2128 cpos.X = scr.dwCursorPosition.X; 2129 cpos.Y = scr.dwCursorPosition.Y; 2130 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color); 2131 FillConsoleOutputAttribute(con_out, curr_attr, 2132 scr.dwSize.X - cpos.X, cpos, &nchars); 2133 FillConsoleOutputCharacter(con_out, ' ', 2134 scr.dwSize.X - cpos.X, cpos, &nchars); 2135 #endif 2136 #endif 2137 #endif 2138 #endif 2139 } 2140 2141 /* 2142 * Clear the current line. 2143 * Clear the screen if there's off-screen memory below the display. 2144 */ 2145 static void 2146 clear_eol_bot() 2147 { 2148 #if MSDOS_COMPILER 2149 clear_eol(); 2150 #else 2151 if (below_mem) 2152 tputs(sc_eos_clear, 1, putchr); 2153 else 2154 tputs(sc_eol_clear, 1, putchr); 2155 #endif 2156 } 2157 2158 /* 2159 * Clear the bottom line of the display. 2160 * Leave the cursor at the beginning of the bottom line. 2161 */ 2162 public void 2163 clear_bot() 2164 { 2165 /* 2166 * If we're in a non-normal attribute mode, temporarily exit 2167 * the mode while we do the clear. Some terminals fill the 2168 * cleared area with the current attribute. 2169 */ 2170 if (oldbot) 2171 lower_left(); 2172 else 2173 line_left(); 2174 2175 if (attrmode == AT_NORMAL) 2176 clear_eol_bot(); 2177 else 2178 { 2179 int saved_attrmode = attrmode; 2180 2181 at_exit(); 2182 clear_eol_bot(); 2183 at_enter(saved_attrmode); 2184 } 2185 } 2186 2187 public void 2188 at_enter(attr) 2189 int attr; 2190 { 2191 attr = apply_at_specials(attr); 2192 2193 #if !MSDOS_COMPILER 2194 /* The one with the most priority is last. */ 2195 if (attr & AT_UNDERLINE) 2196 tputs(sc_u_in, 1, putchr); 2197 if (attr & AT_BOLD) 2198 tputs(sc_b_in, 1, putchr); 2199 if (attr & AT_BLINK) 2200 tputs(sc_bl_in, 1, putchr); 2201 if (attr & AT_STANDOUT) 2202 tputs(sc_s_in, 1, putchr); 2203 #else 2204 flush(); 2205 /* The one with the most priority is first. */ 2206 if (attr & AT_STANDOUT) 2207 { 2208 SETCOLORS(so_fg_color, so_bg_color); 2209 } else if (attr & AT_BLINK) 2210 { 2211 SETCOLORS(bl_fg_color, bl_bg_color); 2212 } 2213 else if (attr & AT_BOLD) 2214 { 2215 SETCOLORS(bo_fg_color, bo_bg_color); 2216 } 2217 else if (attr & AT_UNDERLINE) 2218 { 2219 SETCOLORS(ul_fg_color, ul_bg_color); 2220 } 2221 #endif 2222 2223 attrmode = attr; 2224 } 2225 2226 public void 2227 at_exit() 2228 { 2229 #if !MSDOS_COMPILER 2230 /* Undo things in the reverse order we did them. */ 2231 if (attrmode & AT_STANDOUT) 2232 tputs(sc_s_out, 1, putchr); 2233 if (attrmode & AT_BLINK) 2234 tputs(sc_bl_out, 1, putchr); 2235 if (attrmode & AT_BOLD) 2236 tputs(sc_b_out, 1, putchr); 2237 if (attrmode & AT_UNDERLINE) 2238 tputs(sc_u_out, 1, putchr); 2239 #else 2240 flush(); 2241 SETCOLORS(nm_fg_color, nm_bg_color); 2242 #endif 2243 2244 attrmode = AT_NORMAL; 2245 } 2246 2247 public void 2248 at_switch(attr) 2249 int attr; 2250 { 2251 int new_attrmode = apply_at_specials(attr); 2252 int ignore_modes = AT_ANSI; 2253 2254 if ((new_attrmode & ~ignore_modes) != (attrmode & ~ignore_modes)) 2255 { 2256 at_exit(); 2257 at_enter(attr); 2258 } 2259 } 2260 2261 public int 2262 is_at_equiv(attr1, attr2) 2263 int attr1; 2264 int attr2; 2265 { 2266 attr1 = apply_at_specials(attr1); 2267 attr2 = apply_at_specials(attr2); 2268 2269 return (attr1 == attr2); 2270 } 2271 2272 public int 2273 apply_at_specials(attr) 2274 int attr; 2275 { 2276 if (attr & AT_BINARY) 2277 attr |= binattr; 2278 if (attr & AT_HILITE) 2279 attr |= AT_STANDOUT; 2280 attr &= ~(AT_BINARY|AT_HILITE); 2281 2282 return attr; 2283 } 2284 2285 #if 0 /* No longer used */ 2286 /* 2287 * Erase the character to the left of the cursor 2288 * and move the cursor left. 2289 */ 2290 public void 2291 backspace() 2292 { 2293 #if !MSDOS_COMPILER 2294 /* 2295 * Erase the previous character by overstriking with a space. 2296 */ 2297 tputs(sc_backspace, 1, putchr); 2298 putchr(' '); 2299 tputs(sc_backspace, 1, putchr); 2300 #else 2301 #if MSDOS_COMPILER==MSOFTC 2302 struct rccoord tpos; 2303 2304 flush(); 2305 tpos = _gettextposition(); 2306 if (tpos.col <= 1) 2307 return; 2308 _settextposition(tpos.row, tpos.col-1); 2309 _outtext(" "); 2310 _settextposition(tpos.row, tpos.col-1); 2311 #else 2312 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC 2313 cputs("\b"); 2314 #else 2315 #if MSDOS_COMPILER==WIN32C 2316 COORD cpos; 2317 DWORD cChars; 2318 CONSOLE_SCREEN_BUFFER_INFO scr; 2319 2320 flush(); 2321 GetConsoleScreenBufferInfo(con_out, &scr); 2322 cpos = scr.dwCursorPosition; 2323 if (cpos.X <= 0) 2324 return; 2325 cpos.X--; 2326 SetConsoleCursorPosition(con_out, cpos); 2327 FillConsoleOutputCharacter(con_out, (TCHAR)' ', 1, cpos, &cChars); 2328 SetConsoleCursorPosition(con_out, cpos); 2329 #endif 2330 #endif 2331 #endif 2332 #endif 2333 } 2334 #endif /* 0 */ 2335 2336 /* 2337 * Output a plain backspace, without erasing the previous char. 2338 */ 2339 public void 2340 putbs() 2341 { 2342 #if !MSDOS_COMPILER 2343 tputs(sc_backspace, 1, putchr); 2344 #else 2345 int row, col; 2346 2347 flush(); 2348 { 2349 #if MSDOS_COMPILER==MSOFTC 2350 struct rccoord tpos; 2351 tpos = _gettextposition(); 2352 row = tpos.row; 2353 col = tpos.col; 2354 #else 2355 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC 2356 row = wherey(); 2357 col = wherex(); 2358 #else 2359 #if MSDOS_COMPILER==WIN32C 2360 CONSOLE_SCREEN_BUFFER_INFO scr; 2361 GetConsoleScreenBufferInfo(con_out, &scr); 2362 row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1; 2363 col = scr.dwCursorPosition.X - scr.srWindow.Left + 1; 2364 #endif 2365 #endif 2366 #endif 2367 } 2368 if (col <= 1) 2369 return; 2370 _settextposition(row, col-1); 2371 #endif /* MSDOS_COMPILER */ 2372 } 2373 2374 #if MSDOS_COMPILER==WIN32C 2375 /* 2376 * Determine whether an input character is waiting to be read. 2377 */ 2378 static int 2379 win32_kbhit(tty) 2380 HANDLE tty; 2381 { 2382 INPUT_RECORD ip; 2383 DWORD read; 2384 2385 if (keyCount > 0) 2386 return (TRUE); 2387 2388 currentKey.ascii = 0; 2389 currentKey.scan = 0; 2390 2391 /* 2392 * Wait for a real key-down event, but 2393 * ignore SHIFT and CONTROL key events. 2394 */ 2395 do 2396 { 2397 PeekConsoleInput(tty, &ip, 1, &read); 2398 if (read == 0) 2399 return (FALSE); 2400 ReadConsoleInput(tty, &ip, 1, &read); 2401 } while (ip.EventType != KEY_EVENT || 2402 ip.Event.KeyEvent.bKeyDown != TRUE || 2403 ip.Event.KeyEvent.wVirtualScanCode == 0 || 2404 ip.Event.KeyEvent.wVirtualKeyCode == VK_SHIFT || 2405 ip.Event.KeyEvent.wVirtualKeyCode == VK_CONTROL || 2406 ip.Event.KeyEvent.wVirtualKeyCode == VK_MENU); 2407 2408 currentKey.ascii = ip.Event.KeyEvent.uChar.AsciiChar; 2409 currentKey.scan = ip.Event.KeyEvent.wVirtualScanCode; 2410 keyCount = ip.Event.KeyEvent.wRepeatCount; 2411 2412 if (ip.Event.KeyEvent.dwControlKeyState & 2413 (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED)) 2414 { 2415 switch (currentKey.scan) 2416 { 2417 case PCK_ALT_E: /* letter 'E' */ 2418 currentKey.ascii = 0; 2419 break; 2420 } 2421 } else if (ip.Event.KeyEvent.dwControlKeyState & 2422 (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED)) 2423 { 2424 switch (currentKey.scan) 2425 { 2426 case PCK_RIGHT: /* right arrow */ 2427 currentKey.scan = PCK_CTL_RIGHT; 2428 break; 2429 case PCK_LEFT: /* left arrow */ 2430 currentKey.scan = PCK_CTL_LEFT; 2431 break; 2432 case PCK_DELETE: /* delete */ 2433 currentKey.scan = PCK_CTL_DELETE; 2434 break; 2435 } 2436 } 2437 return (TRUE); 2438 } 2439 2440 /* 2441 * Read a character from the keyboard. 2442 */ 2443 public char 2444 WIN32getch(tty) 2445 int tty; 2446 { 2447 int ascii; 2448 2449 if (pending_scancode) 2450 { 2451 pending_scancode = 0; 2452 return ((char)(currentKey.scan & 0x00FF)); 2453 } 2454 2455 while (win32_kbhit((HANDLE)tty) == FALSE) 2456 { 2457 Sleep(20); 2458 if (ABORT_SIGS()) 2459 return ('\003'); 2460 continue; 2461 } 2462 keyCount --; 2463 ascii = currentKey.ascii; 2464 /* 2465 * On PC's, the extended keys return a 2 byte sequence beginning 2466 * with '00', so if the ascii code is 00, the next byte will be 2467 * the lsb of the scan code. 2468 */ 2469 pending_scancode = (ascii == 0x00); 2470 return ((char)ascii); 2471 } 2472 #endif 2473