xref: /freebsd/contrib/less/screen.c (revision 63a938566d524836885917d95bd491aa4400b181)
1 /*
2  * Copyright (C) 1984-2017  Mark Nudelman
3  *
4  * You may distribute under the terms of either the GNU General Public
5  * License or the Less License, as specified in the README file.
6  *
7  * For more information, see the README file.
8  */
9 
10 
11 /*
12  * Routines which deal with the characteristics of the terminal.
13  * Uses termcap to be as terminal-independent as possible.
14  */
15 
16 #include "less.h"
17 #include "cmd.h"
18 
19 #if MSDOS_COMPILER
20 #include "pckeys.h"
21 #if MSDOS_COMPILER==MSOFTC
22 #include <graph.h>
23 #else
24 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
25 #include <conio.h>
26 #if MSDOS_COMPILER==DJGPPC
27 #include <pc.h>
28 extern int fd0;
29 #endif
30 #else
31 #if MSDOS_COMPILER==WIN32C
32 #include <windows.h>
33 #endif
34 #endif
35 #endif
36 #include <time.h>
37 
38 #else
39 
40 #if HAVE_SYS_IOCTL_H
41 #include <sys/ioctl.h>
42 #endif
43 
44 #if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
45 #include <termios.h>
46 #else
47 #if HAVE_TERMIO_H
48 #include <termio.h>
49 #else
50 #if HAVE_SGSTAT_H
51 #include <sgstat.h>
52 #else
53 #include <sgtty.h>
54 #endif
55 #endif
56 #endif
57 
58 #if HAVE_TERMCAP_H
59 #include <termcap.h>
60 #endif
61 #ifdef _OSK
62 #include <signal.h>
63 #endif
64 #if OS2
65 #include <sys/signal.h>
66 #include "pckeys.h"
67 #endif
68 #if HAVE_SYS_STREAM_H
69 #include <sys/stream.h>
70 #endif
71 #if HAVE_SYS_PTEM_H
72 #include <sys/ptem.h>
73 #endif
74 
75 #endif /* MSDOS_COMPILER */
76 
77 /*
78  * Check for broken termios package that forces you to manually
79  * set the line discipline.
80  */
81 #ifdef __ultrix__
82 #define MUST_SET_LINE_DISCIPLINE 1
83 #else
84 #define MUST_SET_LINE_DISCIPLINE 0
85 #endif
86 
87 #if OS2
88 #define	DEFAULT_TERM		"ansi"
89 static char *windowid;
90 #else
91 #define	DEFAULT_TERM		"unknown"
92 #endif
93 
94 #if MSDOS_COMPILER==MSOFTC
95 static int videopages;
96 static long msec_loops;
97 static int flash_created = 0;
98 #define	SETCOLORS(fg,bg)	{ _settextcolor(fg); _setbkcolor(bg); }
99 #endif
100 
101 #if MSDOS_COMPILER==BORLANDC
102 static unsigned short *whitescreen;
103 static int flash_created = 0;
104 #endif
105 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
106 #define _settextposition(y,x)   gotoxy(x,y)
107 #define _clearscreen(m)         clrscr()
108 #define _outtext(s)             cputs(s)
109 #define	SETCOLORS(fg,bg)	{ textcolor(fg); textbackground(bg); }
110 extern int sc_height;
111 #endif
112 
113 #if MSDOS_COMPILER==WIN32C
114 struct keyRecord
115 {
116 	int ascii;
117 	int scan;
118 } currentKey;
119 
120 static int keyCount = 0;
121 static WORD curr_attr;
122 static int pending_scancode = 0;
123 static WORD *whitescreen;
124 
125 static HANDLE con_out_save = INVALID_HANDLE_VALUE; /* previous console */
126 static HANDLE con_out_ours = INVALID_HANDLE_VALUE; /* our own */
127 HANDLE con_out = INVALID_HANDLE_VALUE;             /* current console */
128 
129 extern int utf_mode;
130 extern int quitting;
131 static void win32_init_term();
132 static void win32_deinit_term();
133 
134 #ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
135 #define ENABLE_VIRTUAL_TERMINAL_PROCESSING 4
136 #endif
137 
138 #define FG_COLORS       (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY)
139 #define BG_COLORS       (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY)
140 #define	MAKEATTR(fg,bg)		((WORD)((fg)|((bg)<<4)))
141 #define	SETCOLORS(fg,bg)	{ curr_attr = MAKEATTR(fg,bg); \
142 				if (SetConsoleTextAttribute(con_out, curr_attr) == 0) \
143 				error("SETCOLORS failed", NULL_PARG); }
144 #endif
145 
146 #if MSDOS_COMPILER
147 public int nm_fg_color;		/* Color of normal text */
148 public int nm_bg_color;
149 public int bo_fg_color;		/* Color of bold text */
150 public int bo_bg_color;
151 public int ul_fg_color;		/* Color of underlined text */
152 public int ul_bg_color;
153 public int so_fg_color;		/* Color of standout text */
154 public int so_bg_color;
155 public int bl_fg_color;		/* Color of blinking text */
156 public int bl_bg_color;
157 static int sy_fg_color;		/* Color of system text (before less) */
158 static int sy_bg_color;
159 public int sgr_mode;		/* Honor ANSI sequences rather than using above */
160 #if MSDOS_COMPILER==WIN32C
161 public int have_ul;		/* Is underline available? */
162 #endif
163 #else
164 
165 /*
166  * Strings passed to tputs() to do various terminal functions.
167  */
168 static char
169 	*sc_pad,		/* Pad string */
170 	*sc_home,		/* Cursor home */
171 	*sc_addline,		/* Add line, scroll down following lines */
172 	*sc_lower_left,		/* Cursor to last line, first column */
173 	*sc_return,		/* Cursor to beginning of current line */
174 	*sc_move,		/* General cursor positioning */
175 	*sc_clear,		/* Clear screen */
176 	*sc_eol_clear,		/* Clear to end of line */
177 	*sc_eos_clear,		/* Clear to end of screen */
178 	*sc_s_in,		/* Enter standout (highlighted) mode */
179 	*sc_s_out,		/* Exit standout mode */
180 	*sc_u_in,		/* Enter underline mode */
181 	*sc_u_out,		/* Exit underline mode */
182 	*sc_b_in,		/* Enter bold mode */
183 	*sc_b_out,		/* Exit bold mode */
184 	*sc_bl_in,		/* Enter blink mode */
185 	*sc_bl_out,		/* Exit blink mode */
186 	*sc_visual_bell,	/* Visual bell (flash screen) sequence */
187 	*sc_backspace,		/* Backspace cursor */
188 	*sc_s_keypad,		/* Start keypad mode */
189 	*sc_e_keypad,		/* End keypad mode */
190 	*sc_init,		/* Startup terminal initialization */
191 	*sc_deinit;		/* Exit terminal de-initialization */
192 #endif
193 
194 static int init_done = 0;
195 
196 public int auto_wrap;		/* Terminal does \r\n when write past margin */
197 public int ignaw;		/* Terminal ignores \n immediately after wrap */
198 public int erase_char;		/* The user's erase char */
199 public int erase2_char;		/* The user's other erase char */
200 public int kill_char;		/* The user's line-kill char */
201 public int werase_char;		/* The user's word-erase char */
202 public int sc_width, sc_height;	/* Height & width of screen */
203 public int bo_s_width, bo_e_width;	/* Printing width of boldface seq */
204 public int ul_s_width, ul_e_width;	/* Printing width of underline seq */
205 public int so_s_width, so_e_width;	/* Printing width of standout seq */
206 public int bl_s_width, bl_e_width;	/* Printing width of blink seq */
207 public int above_mem, below_mem;	/* Memory retained above/below screen */
208 public int can_goto_line;		/* Can move cursor to any line */
209 public int clear_bg;		/* Clear fills with background color */
210 public int missing_cap = 0;	/* Some capability is missing */
211 public char *kent = NULL;	/* Keypad ENTER sequence */
212 
213 static int attrmode = AT_NORMAL;
214 extern int binattr;
215 extern int line_count;
216 
217 #if !MSDOS_COMPILER
218 static char *cheaper();
219 static void tmodes();
220 #endif
221 
222 /*
223  * These two variables are sometimes defined in,
224  * and needed by, the termcap library.
225  */
226 #if MUST_DEFINE_OSPEED
227 extern short ospeed;	/* Terminal output baud rate */
228 extern char PC;		/* Pad character */
229 #endif
230 #ifdef _OSK
231 short ospeed;
232 char PC_, *UP, *BC;
233 #endif
234 
235 extern int quiet;		/* If VERY_QUIET, use visual bell for bell */
236 extern int no_back_scroll;
237 extern int swindow;
238 extern int no_init;
239 extern int no_keypad;
240 extern int sigs;
241 extern int wscroll;
242 extern int screen_trashed;
243 extern int tty;
244 extern int top_scroll;
245 extern int quit_if_one_screen;
246 extern int oldbot;
247 #if HILITE_SEARCH
248 extern int hilite_search;
249 #endif
250 
251 extern char *tgetstr();
252 extern char *tgoto();
253 
254 
255 /*
256  * Change terminal to "raw mode", or restore to "normal" mode.
257  * "Raw mode" means
258  *	1. An outstanding read will complete on receipt of a single keystroke.
259  *	2. Input is not echoed.
260  *	3. On output, \n is mapped to \r\n.
261  *	4. \t is NOT expanded into spaces.
262  *	5. Signal-causing characters such as ctrl-C (interrupt),
263  *	   etc. are NOT disabled.
264  * It doesn't matter whether an input \n is mapped to \r, or vice versa.
265  */
266 	public void
267 raw_mode(on)
268 	int on;
269 {
270 	static int curr_on = 0;
271 
272 	if (on == curr_on)
273 		return;
274 	erase2_char = '\b'; /* in case OS doesn't know about erase2 */
275 #if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
276     {
277 	struct termios s;
278 	static struct termios save_term;
279 	static int saved_term = 0;
280 
281 	if (on)
282 	{
283 		/*
284 		 * Get terminal modes.
285 		 */
286 		tcgetattr(tty, &s);
287 
288 		/*
289 		 * Save modes and set certain variables dependent on modes.
290 		 */
291 		if (!saved_term)
292 		{
293 			save_term = s;
294 			saved_term = 1;
295 		}
296 #if HAVE_OSPEED
297 		switch (cfgetospeed(&s))
298 		{
299 #ifdef B0
300 		case B0: ospeed = 0; break;
301 #endif
302 #ifdef B50
303 		case B50: ospeed = 1; break;
304 #endif
305 #ifdef B75
306 		case B75: ospeed = 2; break;
307 #endif
308 #ifdef B110
309 		case B110: ospeed = 3; break;
310 #endif
311 #ifdef B134
312 		case B134: ospeed = 4; break;
313 #endif
314 #ifdef B150
315 		case B150: ospeed = 5; break;
316 #endif
317 #ifdef B200
318 		case B200: ospeed = 6; break;
319 #endif
320 #ifdef B300
321 		case B300: ospeed = 7; break;
322 #endif
323 #ifdef B600
324 		case B600: ospeed = 8; break;
325 #endif
326 #ifdef B1200
327 		case B1200: ospeed = 9; break;
328 #endif
329 #ifdef B1800
330 		case B1800: ospeed = 10; break;
331 #endif
332 #ifdef B2400
333 		case B2400: ospeed = 11; break;
334 #endif
335 #ifdef B4800
336 		case B4800: ospeed = 12; break;
337 #endif
338 #ifdef B9600
339 		case B9600: ospeed = 13; break;
340 #endif
341 #ifdef EXTA
342 		case EXTA: ospeed = 14; break;
343 #endif
344 #ifdef EXTB
345 		case EXTB: ospeed = 15; break;
346 #endif
347 #ifdef B57600
348 		case B57600: ospeed = 16; break;
349 #endif
350 #ifdef B115200
351 		case B115200: ospeed = 17; break;
352 #endif
353 		default: ;
354 		}
355 #endif
356 		erase_char = s.c_cc[VERASE];
357 #ifdef VERASE2
358 		erase2_char = s.c_cc[VERASE2];
359 #endif
360 		kill_char = s.c_cc[VKILL];
361 #ifdef VWERASE
362 		werase_char = s.c_cc[VWERASE];
363 #else
364 		werase_char = CONTROL('W');
365 #endif
366 
367 		/*
368 		 * Set the modes to the way we want them.
369 		 */
370 		s.c_lflag &= ~(0
371 #ifdef ICANON
372 			| ICANON
373 #endif
374 #ifdef ECHO
375 			| ECHO
376 #endif
377 #ifdef ECHOE
378 			| ECHOE
379 #endif
380 #ifdef ECHOK
381 			| ECHOK
382 #endif
383 #if ECHONL
384 			| ECHONL
385 #endif
386 		);
387 
388 		s.c_oflag |= (0
389 #ifdef OXTABS
390 			| OXTABS
391 #else
392 #ifdef TAB3
393 			| TAB3
394 #else
395 #ifdef XTABS
396 			| XTABS
397 #endif
398 #endif
399 #endif
400 #ifdef OPOST
401 			| OPOST
402 #endif
403 #ifdef ONLCR
404 			| ONLCR
405 #endif
406 		);
407 
408 		s.c_oflag &= ~(0
409 #ifdef ONOEOT
410 			| ONOEOT
411 #endif
412 #ifdef OCRNL
413 			| OCRNL
414 #endif
415 #ifdef ONOCR
416 			| ONOCR
417 #endif
418 #ifdef ONLRET
419 			| ONLRET
420 #endif
421 		);
422 		s.c_cc[VMIN] = 1;
423 		s.c_cc[VTIME] = 0;
424 #ifdef VLNEXT
425 		s.c_cc[VLNEXT] = 0;
426 #endif
427 #ifdef VDSUSP
428 		s.c_cc[VDSUSP] = 0;
429 #endif
430 #if MUST_SET_LINE_DISCIPLINE
431 		/*
432 		 * System's termios is broken; need to explicitly
433 		 * request TERMIODISC line discipline.
434 		 */
435 		s.c_line = TERMIODISC;
436 #endif
437 	} else
438 	{
439 		/*
440 		 * Restore saved modes.
441 		 */
442 		s = save_term;
443 	}
444 #if HAVE_FSYNC
445 	fsync(tty);
446 #endif
447 	tcsetattr(tty, TCSADRAIN, &s);
448 #if MUST_SET_LINE_DISCIPLINE
449 	if (!on)
450 	{
451 		/*
452 		 * Broken termios *ignores* any line discipline
453 		 * except TERMIODISC.  A different old line discipline
454 		 * is therefore not restored, yet.  Restore the old
455 		 * line discipline by hand.
456 		 */
457 		ioctl(tty, TIOCSETD, &save_term.c_line);
458 	}
459 #endif
460     }
461 #else
462 #ifdef TCGETA
463     {
464 	struct termio s;
465 	static struct termio save_term;
466 	static int saved_term = 0;
467 
468 	if (on)
469 	{
470 		/*
471 		 * Get terminal modes.
472 		 */
473 		ioctl(tty, TCGETA, &s);
474 
475 		/*
476 		 * Save modes and set certain variables dependent on modes.
477 		 */
478 		if (!saved_term)
479 		{
480 			save_term = s;
481 			saved_term = 1;
482 		}
483 #if HAVE_OSPEED
484 		ospeed = s.c_cflag & CBAUD;
485 #endif
486 		erase_char = s.c_cc[VERASE];
487 		kill_char = s.c_cc[VKILL];
488 #ifdef VWERASE
489 		werase_char = s.c_cc[VWERASE];
490 #else
491 		werase_char = CONTROL('W');
492 #endif
493 
494 		/*
495 		 * Set the modes to the way we want them.
496 		 */
497 		s.c_lflag &= ~(ICANON|ECHO|ECHOE|ECHOK|ECHONL);
498 		s.c_oflag |=  (OPOST|ONLCR|TAB3);
499 		s.c_oflag &= ~(OCRNL|ONOCR|ONLRET);
500 		s.c_cc[VMIN] = 1;
501 		s.c_cc[VTIME] = 0;
502 	} else
503 	{
504 		/*
505 		 * Restore saved modes.
506 		 */
507 		s = save_term;
508 	}
509 	ioctl(tty, TCSETAW, &s);
510     }
511 #else
512 #ifdef TIOCGETP
513     {
514 	struct sgttyb s;
515 	static struct sgttyb save_term;
516 	static int saved_term = 0;
517 
518 	if (on)
519 	{
520 		/*
521 		 * Get terminal modes.
522 		 */
523 		ioctl(tty, TIOCGETP, &s);
524 
525 		/*
526 		 * Save modes and set certain variables dependent on modes.
527 		 */
528 		if (!saved_term)
529 		{
530 			save_term = s;
531 			saved_term = 1;
532 		}
533 #if HAVE_OSPEED
534 		ospeed = s.sg_ospeed;
535 #endif
536 		erase_char = s.sg_erase;
537 		kill_char = s.sg_kill;
538 		werase_char = CONTROL('W');
539 
540 		/*
541 		 * Set the modes to the way we want them.
542 		 */
543 		s.sg_flags |= CBREAK;
544 		s.sg_flags &= ~(ECHO|XTABS);
545 	} else
546 	{
547 		/*
548 		 * Restore saved modes.
549 		 */
550 		s = save_term;
551 	}
552 	ioctl(tty, TIOCSETN, &s);
553     }
554 #else
555 #ifdef _OSK
556     {
557 	struct sgbuf s;
558 	static struct sgbuf save_term;
559 	static int saved_term = 0;
560 
561 	if (on)
562 	{
563 		/*
564 		 * Get terminal modes.
565 		 */
566 		_gs_opt(tty, &s);
567 
568 		/*
569 		 * Save modes and set certain variables dependent on modes.
570 		 */
571 		if (!saved_term)
572 		{
573 			save_term = s;
574 			saved_term = 1;
575 		}
576 		erase_char = s.sg_bspch;
577 		kill_char = s.sg_dlnch;
578 		werase_char = CONTROL('W');
579 
580 		/*
581 		 * Set the modes to the way we want them.
582 		 */
583 		s.sg_echo = 0;
584 		s.sg_eofch = 0;
585 		s.sg_pause = 0;
586 		s.sg_psch = 0;
587 	} else
588 	{
589 		/*
590 		 * Restore saved modes.
591 		 */
592 		s = save_term;
593 	}
594 	_ss_opt(tty, &s);
595     }
596 #else
597 	/* MS-DOS, Windows, or OS2 */
598 #if OS2
599 	/* OS2 */
600 	LSIGNAL(SIGINT, SIG_IGN);
601 #endif
602 	erase_char = '\b';
603 #if MSDOS_COMPILER==DJGPPC
604 	kill_char = CONTROL('U');
605 	/*
606 	 * So that when we shell out or run another program, its
607 	 * stdin is in cooked mode.  We do not switch stdin to binary
608 	 * mode if fd0 is zero, since that means we were called before
609 	 * tty was reopened in open_getchr, in which case we would be
610 	 * changing the original stdin device outside less.
611 	 */
612 	if (fd0 != 0)
613 		setmode(0, on ? O_BINARY : O_TEXT);
614 #else
615 	kill_char = ESC;
616 #endif
617 	werase_char = CONTROL('W');
618 #endif
619 #endif
620 #endif
621 #endif
622 	curr_on = on;
623 }
624 
625 #if !MSDOS_COMPILER
626 /*
627  * Some glue to prevent calling termcap functions if tgetent() failed.
628  */
629 static int hardcopy;
630 
631 	static char *
632 ltget_env(capname)
633 	char *capname;
634 {
635 	char name[16];
636 	char *s;
637 
638 	s = lgetenv("LESS_TERMCAP_DEBUG");
639 	if (s != NULL && *s != '\0')
640 	{
641 		struct env { struct env *next; char *name; char *value; };
642 		static struct env *envs = NULL;
643 		struct env *p;
644 		for (p = envs;  p != NULL;  p = p->next)
645 			if (strcmp(p->name, capname) == 0)
646 				return p->value;
647 		p = (struct env *) ecalloc(1, sizeof(struct env));
648 		p->name = save(capname);
649 		p->value = (char *) ecalloc(strlen(capname)+3, sizeof(char));
650 		sprintf(p->value, "<%s>", capname);
651 		p->next = envs;
652 		envs = p;
653 		return p->value;
654 	}
655 	strcpy(name, "LESS_TERMCAP_");
656 	strcat(name, capname);
657 	return (lgetenv(name));
658 }
659 
660 	static int
661 ltgetflag(capname)
662 	char *capname;
663 {
664 	char *s;
665 
666 	if ((s = ltget_env(capname)) != NULL)
667 		return (*s != '\0' && *s != '0');
668 	if (hardcopy)
669 		return (0);
670 	return (tgetflag(capname));
671 }
672 
673 	static int
674 ltgetnum(capname)
675 	char *capname;
676 {
677 	char *s;
678 
679 	if ((s = ltget_env(capname)) != NULL)
680 		return (atoi(s));
681 	if (hardcopy)
682 		return (-1);
683 	return (tgetnum(capname));
684 }
685 
686 	static char *
687 ltgetstr(capname, pp)
688 	char *capname;
689 	char **pp;
690 {
691 	char *s;
692 
693 	if ((s = ltget_env(capname)) != NULL)
694 		return (s);
695 	if (hardcopy)
696 		return (NULL);
697 	return (tgetstr(capname, pp));
698 }
699 #endif /* MSDOS_COMPILER */
700 
701 /*
702  * Get size of the output screen.
703  */
704 	public void
705 scrsize()
706 {
707 	char *s;
708 	int sys_height;
709 	int sys_width;
710 #if !MSDOS_COMPILER
711 	int n;
712 #endif
713 
714 #define	DEF_SC_WIDTH	80
715 #if MSDOS_COMPILER
716 #define	DEF_SC_HEIGHT	25
717 #else
718 #define	DEF_SC_HEIGHT	24
719 #endif
720 
721 
722 	sys_width = sys_height = 0;
723 
724 #if MSDOS_COMPILER==MSOFTC
725 	{
726 		struct videoconfig w;
727 		_getvideoconfig(&w);
728 		sys_height = w.numtextrows;
729 		sys_width = w.numtextcols;
730 	}
731 #else
732 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
733 	{
734 		struct text_info w;
735 		gettextinfo(&w);
736 		sys_height = w.screenheight;
737 		sys_width = w.screenwidth;
738 	}
739 #else
740 #if MSDOS_COMPILER==WIN32C
741 	{
742 		CONSOLE_SCREEN_BUFFER_INFO scr;
743 		GetConsoleScreenBufferInfo(con_out, &scr);
744 		sys_height = scr.srWindow.Bottom - scr.srWindow.Top + 1;
745 		sys_width = scr.srWindow.Right - scr.srWindow.Left + 1;
746 	}
747 #else
748 #if OS2
749 	{
750 		int s[2];
751 		_scrsize(s);
752 		sys_width = s[0];
753 		sys_height = s[1];
754 		/*
755 		 * When using terminal emulators for XFree86/OS2, the
756 		 * _scrsize function does not work well.
757 		 * Call the scrsize.exe program to get the window size.
758 		 */
759 		windowid = getenv("WINDOWID");
760 		if (windowid != NULL)
761 		{
762 			FILE *fd = popen("scrsize", "rt");
763 			if (fd != NULL)
764 			{
765 				int w, h;
766 				fscanf(fd, "%i %i", &w, &h);
767 				if (w > 0 && h > 0)
768 				{
769 					sys_width = w;
770 					sys_height = h;
771 				}
772 				pclose(fd);
773 			}
774 		}
775 	}
776 #else
777 #ifdef TIOCGWINSZ
778 	{
779 		struct winsize w;
780 		if (ioctl(2, TIOCGWINSZ, &w) == 0)
781 		{
782 			if (w.ws_row > 0)
783 				sys_height = w.ws_row;
784 			if (w.ws_col > 0)
785 				sys_width = w.ws_col;
786 		}
787 	}
788 #else
789 #ifdef WIOCGETD
790 	{
791 		struct uwdata w;
792 		if (ioctl(2, WIOCGETD, &w) == 0)
793 		{
794 			if (w.uw_height > 0)
795 				sys_height = w.uw_height / w.uw_vs;
796 			if (w.uw_width > 0)
797 				sys_width = w.uw_width / w.uw_hs;
798 		}
799 	}
800 #endif
801 #endif
802 #endif
803 #endif
804 #endif
805 #endif
806 
807 	if (sys_height > 0)
808 		sc_height = sys_height;
809 	else if ((s = lgetenv("LINES")) != NULL)
810 		sc_height = atoi(s);
811 #if !MSDOS_COMPILER
812 	else if ((n = ltgetnum("li")) > 0)
813  		sc_height = n;
814 #endif
815 	if (sc_height <= 0)
816 		sc_height = DEF_SC_HEIGHT;
817 
818 	if (sys_width > 0)
819 		sc_width = sys_width;
820 	else if ((s = lgetenv("COLUMNS")) != NULL)
821 		sc_width = atoi(s);
822 #if !MSDOS_COMPILER
823 	else if ((n = ltgetnum("co")) > 0)
824  		sc_width = n;
825 #endif
826 	if (sc_width <= 0)
827 		sc_width = DEF_SC_WIDTH;
828 }
829 
830 #if MSDOS_COMPILER==MSOFTC
831 /*
832  * Figure out how many empty loops it takes to delay a millisecond.
833  */
834 	static void
835 get_clock()
836 {
837 	clock_t start;
838 
839 	/*
840 	 * Get synchronized at the start of a tick.
841 	 */
842 	start = clock();
843 	while (clock() == start)
844 		;
845 	/*
846 	 * Now count loops till the next tick.
847 	 */
848 	start = clock();
849 	msec_loops = 0;
850 	while (clock() == start)
851 		msec_loops++;
852 	/*
853 	 * Convert from (loops per clock) to (loops per millisecond).
854 	 */
855 	msec_loops *= CLOCKS_PER_SEC;
856 	msec_loops /= 1000;
857 }
858 
859 /*
860  * Delay for a specified number of milliseconds.
861  */
862 	static void
863 dummy_func()
864 {
865 	static long delay_dummy = 0;
866 	delay_dummy++;
867 }
868 
869 	static void
870 delay(msec)
871 	int msec;
872 {
873 	long i;
874 
875 	while (msec-- > 0)
876 	{
877 		for (i = 0;  i < msec_loops;  i++)
878 		{
879 			/*
880 			 * Make it look like we're doing something here,
881 			 * so the optimizer doesn't remove the whole loop.
882 			 */
883 			dummy_func();
884 		}
885 	}
886 }
887 #endif
888 
889 /*
890  * Return the characters actually input by a "special" key.
891  */
892 	public char *
893 special_key_str(key)
894 	int key;
895 {
896 	static char tbuf[40];
897 	char *s;
898 #if MSDOS_COMPILER || OS2
899 	static char k_right[]		= { '\340', PCK_RIGHT, 0 };
900 	static char k_left[]		= { '\340', PCK_LEFT, 0  };
901 	static char k_ctl_right[]	= { '\340', PCK_CTL_RIGHT, 0  };
902 	static char k_ctl_left[]	= { '\340', PCK_CTL_LEFT, 0  };
903 	static char k_insert[]		= { '\340', PCK_INSERT, 0  };
904 	static char k_delete[]		= { '\340', PCK_DELETE, 0  };
905 	static char k_ctl_delete[]	= { '\340', PCK_CTL_DELETE, 0  };
906 	static char k_ctl_backspace[]	= { '\177', 0 };
907 	static char k_home[]		= { '\340', PCK_HOME, 0 };
908 	static char k_end[]		= { '\340', PCK_END, 0 };
909 	static char k_up[]		= { '\340', PCK_UP, 0 };
910 	static char k_down[]		= { '\340', PCK_DOWN, 0 };
911 	static char k_backtab[]		= { '\340', PCK_SHIFT_TAB, 0 };
912 	static char k_pagedown[]	= { '\340', PCK_PAGEDOWN, 0 };
913 	static char k_pageup[]		= { '\340', PCK_PAGEUP, 0 };
914 	static char k_f1[]		= { '\340', PCK_F1, 0 };
915 #endif
916 #if !MSDOS_COMPILER
917 	char *sp = tbuf;
918 #endif
919 
920 	switch (key)
921 	{
922 #if OS2
923 	/*
924 	 * If windowid is not NULL, assume less is executed in
925 	 * the XFree86 environment.
926 	 */
927 	case SK_RIGHT_ARROW:
928 		s = windowid ? ltgetstr("kr", &sp) : k_right;
929 		break;
930 	case SK_LEFT_ARROW:
931 		s = windowid ? ltgetstr("kl", &sp) : k_left;
932 		break;
933 	case SK_UP_ARROW:
934 		s = windowid ? ltgetstr("ku", &sp) : k_up;
935 		break;
936 	case SK_DOWN_ARROW:
937 		s = windowid ? ltgetstr("kd", &sp) : k_down;
938 		break;
939 	case SK_PAGE_UP:
940 		s = windowid ? ltgetstr("kP", &sp) : k_pageup;
941 		break;
942 	case SK_PAGE_DOWN:
943 		s = windowid ? ltgetstr("kN", &sp) : k_pagedown;
944 		break;
945 	case SK_HOME:
946 		s = windowid ? ltgetstr("kh", &sp) : k_home;
947 		break;
948 	case SK_END:
949 		s = windowid ? ltgetstr("@7", &sp) : k_end;
950 		break;
951 	case SK_DELETE:
952 		if (windowid)
953 		{
954 			s = ltgetstr("kD", &sp);
955 			if (s == NULL)
956 			{
957 				tbuf[0] = '\177';
958 				tbuf[1] = '\0';
959 				s = tbuf;
960 			}
961 		} else
962 			s = k_delete;
963 		break;
964 #endif
965 #if MSDOS_COMPILER
966 	case SK_RIGHT_ARROW:
967 		s = k_right;
968 		break;
969 	case SK_LEFT_ARROW:
970 		s = k_left;
971 		break;
972 	case SK_UP_ARROW:
973 		s = k_up;
974 		break;
975 	case SK_DOWN_ARROW:
976 		s = k_down;
977 		break;
978 	case SK_PAGE_UP:
979 		s = k_pageup;
980 		break;
981 	case SK_PAGE_DOWN:
982 		s = k_pagedown;
983 		break;
984 	case SK_HOME:
985 		s = k_home;
986 		break;
987 	case SK_END:
988 		s = k_end;
989 		break;
990 	case SK_DELETE:
991 		s = k_delete;
992 		break;
993 #endif
994 #if MSDOS_COMPILER || OS2
995 	case SK_INSERT:
996 		s = k_insert;
997 		break;
998 	case SK_CTL_LEFT_ARROW:
999 		s = k_ctl_left;
1000 		break;
1001 	case SK_CTL_RIGHT_ARROW:
1002 		s = k_ctl_right;
1003 		break;
1004 	case SK_CTL_BACKSPACE:
1005 		s = k_ctl_backspace;
1006 		break;
1007 	case SK_CTL_DELETE:
1008 		s = k_ctl_delete;
1009 		break;
1010 	case SK_F1:
1011 		s = k_f1;
1012 		break;
1013 	case SK_BACKTAB:
1014 		s = k_backtab;
1015 		break;
1016 #else
1017 	case SK_RIGHT_ARROW:
1018 		s = ltgetstr("kr", &sp);
1019 		break;
1020 	case SK_LEFT_ARROW:
1021 		s = ltgetstr("kl", &sp);
1022 		break;
1023 	case SK_UP_ARROW:
1024 		s = ltgetstr("ku", &sp);
1025 		break;
1026 	case SK_DOWN_ARROW:
1027 		s = ltgetstr("kd", &sp);
1028 		break;
1029 	case SK_PAGE_UP:
1030 		s = ltgetstr("kP", &sp);
1031 		break;
1032 	case SK_PAGE_DOWN:
1033 		s = ltgetstr("kN", &sp);
1034 		break;
1035 	case SK_HOME:
1036 		s = ltgetstr("kh", &sp);
1037 		break;
1038 	case SK_END:
1039 		s = ltgetstr("@7", &sp);
1040 		break;
1041 	case SK_DELETE:
1042 		s = ltgetstr("kD", &sp);
1043 		if (s == NULL)
1044 		{
1045 			tbuf[0] = '\177';
1046 			tbuf[1] = '\0';
1047 			s = tbuf;
1048 		}
1049 		break;
1050 #endif
1051 	case SK_CONTROL_K:
1052 		tbuf[0] = CONTROL('K');
1053 		tbuf[1] = '\0';
1054 		s = tbuf;
1055 		break;
1056 	default:
1057 		return (NULL);
1058 	}
1059 	return (s);
1060 }
1061 
1062 /*
1063  * Get terminal capabilities via termcap.
1064  */
1065 	public void
1066 get_term()
1067 {
1068 #if MSDOS_COMPILER
1069 	auto_wrap = 1;
1070 	ignaw = 0;
1071 	can_goto_line = 1;
1072 	clear_bg = 1;
1073 	/*
1074 	 * Set up default colors.
1075 	 * The xx_s_width and xx_e_width vars are already initialized to 0.
1076 	 */
1077 #if MSDOS_COMPILER==MSOFTC
1078 	sy_bg_color = _getbkcolor();
1079 	sy_fg_color = _gettextcolor();
1080 	get_clock();
1081 #else
1082 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1083     {
1084 	struct text_info w;
1085 	gettextinfo(&w);
1086 	sy_bg_color = (w.attribute >> 4) & 0x0F;
1087 	sy_fg_color = (w.attribute >> 0) & 0x0F;
1088     }
1089 #else
1090 #if MSDOS_COMPILER==WIN32C
1091     {
1092 	DWORD nread;
1093 	CONSOLE_SCREEN_BUFFER_INFO scr;
1094 
1095 	con_out_save = con_out = GetStdHandle(STD_OUTPUT_HANDLE);
1096 	/*
1097 	 * Always open stdin in binary. Note this *must* be done
1098 	 * before any file operations have been done on fd0.
1099 	 */
1100 	SET_BINARY(0);
1101 	GetConsoleScreenBufferInfo(con_out, &scr);
1102 	ReadConsoleOutputAttribute(con_out, &curr_attr,
1103 					1, scr.dwCursorPosition, &nread);
1104 	sy_bg_color = (curr_attr & BG_COLORS) >> 4; /* normalize */
1105 	sy_fg_color = curr_attr & FG_COLORS;
1106     }
1107 #endif
1108 #endif
1109 #endif
1110 	nm_fg_color = sy_fg_color;
1111 	nm_bg_color = sy_bg_color;
1112 	bo_fg_color = 11;
1113 	bo_bg_color = 0;
1114 	ul_fg_color = 9;
1115 	ul_bg_color = 0;
1116 	so_fg_color = 15;
1117 	so_bg_color = 9;
1118 	bl_fg_color = 15;
1119 	bl_bg_color = 0;
1120 	sgr_mode = 0;
1121 
1122 	/*
1123 	 * Get size of the screen.
1124 	 */
1125 	scrsize();
1126 	pos_init();
1127 
1128 
1129 #else /* !MSDOS_COMPILER */
1130 
1131 	char *sp;
1132 	char *t1, *t2;
1133 	char *term;
1134 	char termbuf[TERMBUF_SIZE];
1135 
1136 	static char sbuf[TERMSBUF_SIZE];
1137 
1138 #if OS2
1139 	/*
1140 	 * Make sure the termcap database is available.
1141 	 */
1142 	sp = lgetenv("TERMCAP");
1143 	if (sp == NULL || *sp == '\0')
1144 	{
1145 		char *termcap;
1146 		if ((sp = homefile("termcap.dat")) != NULL)
1147 		{
1148 			termcap = (char *) ecalloc(strlen(sp)+9, sizeof(char));
1149 			sprintf(termcap, "TERMCAP=%s", sp);
1150 			free(sp);
1151 			putenv(termcap);
1152 		}
1153 	}
1154 #endif
1155 	/*
1156 	 * Find out what kind of terminal this is.
1157 	 */
1158  	if ((term = lgetenv("TERM")) == NULL)
1159  		term = DEFAULT_TERM;
1160 	hardcopy = 0;
1161  	if (tgetent(termbuf, term) != TGETENT_OK)
1162  		hardcopy = 1;
1163  	if (ltgetflag("hc"))
1164 		hardcopy = 1;
1165 
1166 	/*
1167 	 * Get size of the screen.
1168 	 */
1169 	scrsize();
1170 	pos_init();
1171 
1172 	auto_wrap = ltgetflag("am");
1173 	ignaw = ltgetflag("xn");
1174 	above_mem = ltgetflag("da");
1175 	below_mem = ltgetflag("db");
1176 	clear_bg = ltgetflag("ut");
1177 
1178 	/*
1179 	 * Assumes termcap variable "sg" is the printing width of:
1180 	 * the standout sequence, the end standout sequence,
1181 	 * the underline sequence, the end underline sequence,
1182 	 * the boldface sequence, and the end boldface sequence.
1183 	 */
1184 	if ((so_s_width = ltgetnum("sg")) < 0)
1185 		so_s_width = 0;
1186 	so_e_width = so_s_width;
1187 
1188 	bo_s_width = bo_e_width = so_s_width;
1189 	ul_s_width = ul_e_width = so_s_width;
1190 	bl_s_width = bl_e_width = so_s_width;
1191 
1192 #if HILITE_SEARCH
1193 	if (so_s_width > 0 || so_e_width > 0)
1194 		/*
1195 		 * Disable highlighting by default on magic cookie terminals.
1196 		 * Turning on highlighting might change the displayed width
1197 		 * of a line, causing the display to get messed up.
1198 		 * The user can turn it back on with -g,
1199 		 * but she won't like the results.
1200 		 */
1201 		hilite_search = 0;
1202 #endif
1203 
1204 	/*
1205 	 * Get various string-valued capabilities.
1206 	 */
1207 	sp = sbuf;
1208 
1209 #if HAVE_OSPEED
1210 	sc_pad = ltgetstr("pc", &sp);
1211 	if (sc_pad != NULL)
1212 		PC = *sc_pad;
1213 #endif
1214 
1215 	sc_s_keypad = ltgetstr("ks", &sp);
1216 	if (sc_s_keypad == NULL)
1217 		sc_s_keypad = "";
1218 	sc_e_keypad = ltgetstr("ke", &sp);
1219 	if (sc_e_keypad == NULL)
1220 		sc_e_keypad = "";
1221 	kent = ltgetstr("@8", &sp);
1222 
1223 	sc_init = ltgetstr("ti", &sp);
1224 	if (sc_init == NULL)
1225 		sc_init = "";
1226 
1227 	sc_deinit= ltgetstr("te", &sp);
1228 	if (sc_deinit == NULL)
1229 		sc_deinit = "";
1230 
1231 	sc_eol_clear = ltgetstr("ce", &sp);
1232 	if (sc_eol_clear == NULL || *sc_eol_clear == '\0')
1233 	{
1234 		missing_cap = 1;
1235 		sc_eol_clear = "";
1236 	}
1237 
1238 	sc_eos_clear = ltgetstr("cd", &sp);
1239 	if (below_mem && (sc_eos_clear == NULL || *sc_eos_clear == '\0'))
1240 	{
1241 		missing_cap = 1;
1242 		sc_eos_clear = "";
1243 	}
1244 
1245 	sc_clear = ltgetstr("cl", &sp);
1246 	if (sc_clear == NULL || *sc_clear == '\0')
1247 	{
1248 		missing_cap = 1;
1249 		sc_clear = "\n\n";
1250 	}
1251 
1252 	sc_move = ltgetstr("cm", &sp);
1253 	if (sc_move == NULL || *sc_move == '\0')
1254 	{
1255 		/*
1256 		 * This is not an error here, because we don't
1257 		 * always need sc_move.
1258 		 * We need it only if we don't have home or lower-left.
1259 		 */
1260 		sc_move = "";
1261 		can_goto_line = 0;
1262 	} else
1263 		can_goto_line = 1;
1264 
1265 	tmodes("so", "se", &sc_s_in, &sc_s_out, "", "", &sp);
1266 	tmodes("us", "ue", &sc_u_in, &sc_u_out, sc_s_in, sc_s_out, &sp);
1267 	tmodes("md", "me", &sc_b_in, &sc_b_out, sc_s_in, sc_s_out, &sp);
1268 	tmodes("mb", "me", &sc_bl_in, &sc_bl_out, sc_s_in, sc_s_out, &sp);
1269 
1270 	sc_visual_bell = ltgetstr("vb", &sp);
1271 	if (sc_visual_bell == NULL)
1272 		sc_visual_bell = "";
1273 
1274 	if (ltgetflag("bs"))
1275 		sc_backspace = "\b";
1276 	else
1277 	{
1278 		sc_backspace = ltgetstr("bc", &sp);
1279 		if (sc_backspace == NULL || *sc_backspace == '\0')
1280 			sc_backspace = "\b";
1281 	}
1282 
1283 	/*
1284 	 * Choose between using "ho" and "cm" ("home" and "cursor move")
1285 	 * to move the cursor to the upper left corner of the screen.
1286 	 */
1287 	t1 = ltgetstr("ho", &sp);
1288 	if (t1 == NULL)
1289 		t1 = "";
1290 	if (*sc_move == '\0')
1291 		t2 = "";
1292 	else
1293 	{
1294 		strcpy(sp, tgoto(sc_move, 0, 0));
1295 		t2 = sp;
1296 		sp += strlen(sp) + 1;
1297 	}
1298 	sc_home = cheaper(t1, t2, "|\b^");
1299 
1300 	/*
1301 	 * Choose between using "ll" and "cm"  ("lower left" and "cursor move")
1302 	 * to move the cursor to the lower left corner of the screen.
1303 	 */
1304 	t1 = ltgetstr("ll", &sp);
1305 	if (t1 == NULL)
1306 		t1 = "";
1307 	if (*sc_move == '\0')
1308 		t2 = "";
1309 	else
1310 	{
1311 		strcpy(sp, tgoto(sc_move, 0, sc_height-1));
1312 		t2 = sp;
1313 		sp += strlen(sp) + 1;
1314 	}
1315 	sc_lower_left = cheaper(t1, t2, "\r");
1316 
1317 	/*
1318 	 * Get carriage return string.
1319 	 */
1320 	sc_return = ltgetstr("cr", &sp);
1321 	if (sc_return == NULL)
1322 		sc_return = "\r";
1323 
1324 	/*
1325 	 * Choose between using "al" or "sr" ("add line" or "scroll reverse")
1326 	 * to add a line at the top of the screen.
1327 	 */
1328 	t1 = ltgetstr("al", &sp);
1329 	if (t1 == NULL)
1330 		t1 = "";
1331 	t2 = ltgetstr("sr", &sp);
1332 	if (t2 == NULL)
1333 		t2 = "";
1334 #if OS2
1335 	if (*t1 == '\0' && *t2 == '\0')
1336 		sc_addline = "";
1337 	else
1338 #endif
1339 	if (above_mem)
1340 		sc_addline = t1;
1341 	else
1342 		sc_addline = cheaper(t1, t2, "");
1343 	if (*sc_addline == '\0')
1344 	{
1345 		/*
1346 		 * Force repaint on any backward movement.
1347 		 */
1348 		no_back_scroll = 1;
1349 	}
1350 #endif /* MSDOS_COMPILER */
1351 }
1352 
1353 #if !MSDOS_COMPILER
1354 /*
1355  * Return the cost of displaying a termcap string.
1356  * We use the trick of calling tputs, but as a char printing function
1357  * we give it inc_costcount, which just increments "costcount".
1358  * This tells us how many chars would be printed by using this string.
1359  * {{ Couldn't we just use strlen? }}
1360  */
1361 static int costcount;
1362 
1363 /*ARGSUSED*/
1364 	static int
1365 inc_costcount(c)
1366 	int c;
1367 {
1368 	costcount++;
1369 	return (c);
1370 }
1371 
1372 	static int
1373 cost(t)
1374 	char *t;
1375 {
1376 	costcount = 0;
1377 	tputs(t, sc_height, inc_costcount);
1378 	return (costcount);
1379 }
1380 
1381 /*
1382  * Return the "best" of the two given termcap strings.
1383  * The best, if both exist, is the one with the lower
1384  * cost (see cost() function).
1385  */
1386 	static char *
1387 cheaper(t1, t2, def)
1388 	char *t1, *t2;
1389 	char *def;
1390 {
1391 	if (*t1 == '\0' && *t2 == '\0')
1392 	{
1393 		missing_cap = 1;
1394 		return (def);
1395 	}
1396 	if (*t1 == '\0')
1397 		return (t2);
1398 	if (*t2 == '\0')
1399 		return (t1);
1400 	if (cost(t1) < cost(t2))
1401 		return (t1);
1402 	return (t2);
1403 }
1404 
1405 	static void
1406 tmodes(incap, outcap, instr, outstr, def_instr, def_outstr, spp)
1407 	char *incap;
1408 	char *outcap;
1409 	char **instr;
1410 	char **outstr;
1411 	char *def_instr;
1412 	char *def_outstr;
1413 	char **spp;
1414 {
1415 	*instr = ltgetstr(incap, spp);
1416 	if (*instr == NULL)
1417 	{
1418 		/* Use defaults. */
1419 		*instr = def_instr;
1420 		*outstr = def_outstr;
1421 		return;
1422 	}
1423 
1424 	*outstr = ltgetstr(outcap, spp);
1425 	if (*outstr == NULL)
1426 		/* No specific out capability; use "me". */
1427 		*outstr = ltgetstr("me", spp);
1428 	if (*outstr == NULL)
1429 		/* Don't even have "me"; use a null string. */
1430 		*outstr = "";
1431 }
1432 
1433 #endif /* MSDOS_COMPILER */
1434 
1435 
1436 /*
1437  * Below are the functions which perform all the
1438  * terminal-specific screen manipulation.
1439  */
1440 
1441 
1442 #if MSDOS_COMPILER
1443 
1444 #if MSDOS_COMPILER==WIN32C
1445 	static void
1446 _settextposition(int row, int col)
1447 {
1448 	COORD cpos;
1449 	CONSOLE_SCREEN_BUFFER_INFO csbi;
1450 
1451 	GetConsoleScreenBufferInfo(con_out, &csbi);
1452 	cpos.X = csbi.srWindow.Left + (col - 1);
1453 	cpos.Y = csbi.srWindow.Top + (row - 1);
1454 	SetConsoleCursorPosition(con_out, cpos);
1455 }
1456 #endif
1457 
1458 /*
1459  * Initialize the screen to the correct color at startup.
1460  */
1461 	static void
1462 initcolor()
1463 {
1464 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1465 	intensevideo();
1466 #endif
1467 	SETCOLORS(nm_fg_color, nm_bg_color);
1468 #if 0
1469 	/*
1470 	 * This clears the screen at startup.  This is different from
1471 	 * the behavior of other versions of less.  Disable it for now.
1472 	 */
1473 	char *blanks;
1474 	int row;
1475 	int col;
1476 
1477 	/*
1478 	 * Create a complete, blank screen using "normal" colors.
1479 	 */
1480 	SETCOLORS(nm_fg_color, nm_bg_color);
1481 	blanks = (char *) ecalloc(width+1, sizeof(char));
1482 	for (col = 0;  col < sc_width;  col++)
1483 		blanks[col] = ' ';
1484 	blanks[sc_width] = '\0';
1485 	for (row = 0;  row < sc_height;  row++)
1486 		_outtext(blanks);
1487 	free(blanks);
1488 #endif
1489 }
1490 #endif
1491 
1492 #if MSDOS_COMPILER==WIN32C
1493 
1494 /*
1495  * Termcap-like init with a private win32 console.
1496  */
1497 	static void
1498 win32_init_term()
1499 {
1500 	CONSOLE_SCREEN_BUFFER_INFO scr;
1501 	COORD size;
1502 
1503 	if (con_out_save == INVALID_HANDLE_VALUE)
1504 		return;
1505 
1506 	GetConsoleScreenBufferInfo(con_out_save, &scr);
1507 
1508 	if (con_out_ours == INVALID_HANDLE_VALUE)
1509 	{
1510 		DWORD output_mode;
1511 
1512 		/*
1513 		 * Create our own screen buffer, so that we
1514 		 * may restore the original when done.
1515 		 */
1516 		con_out_ours = CreateConsoleScreenBuffer(
1517 			GENERIC_WRITE | GENERIC_READ,
1518 			FILE_SHARE_WRITE | FILE_SHARE_READ,
1519 			(LPSECURITY_ATTRIBUTES) NULL,
1520 			CONSOLE_TEXTMODE_BUFFER,
1521 			(LPVOID) NULL);
1522 		/*
1523 		 * Enable underline, if available.
1524 		 */
1525 		GetConsoleMode(con_out_ours, &output_mode);
1526 		have_ul = SetConsoleMode(con_out_ours,
1527 			    output_mode | ENABLE_VIRTUAL_TERMINAL_PROCESSING);
1528 	}
1529 
1530 	size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
1531 	size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
1532 	SetConsoleScreenBufferSize(con_out_ours, size);
1533 	SetConsoleActiveScreenBuffer(con_out_ours);
1534 	con_out = con_out_ours;
1535 }
1536 
1537 /*
1538  * Restore the startup console.
1539  */
1540 static void
1541 win32_deinit_term()
1542 {
1543 	if (con_out_save == INVALID_HANDLE_VALUE)
1544 		return;
1545 	if (quitting)
1546 		(void) CloseHandle(con_out_ours);
1547 	SetConsoleActiveScreenBuffer(con_out_save);
1548 	con_out = con_out_save;
1549 }
1550 
1551 #endif
1552 
1553 /*
1554  * Initialize terminal
1555  */
1556 	public void
1557 init()
1558 {
1559 #if !MSDOS_COMPILER
1560 	if (quit_if_one_screen && line_count >= sc_height)
1561 		quit_if_one_screen = FALSE;
1562 	if (!no_init && !quit_if_one_screen)
1563 		tputs(sc_init, sc_height, putchr);
1564 	if (!no_keypad)
1565 		tputs(sc_s_keypad, sc_height, putchr);
1566 	if (top_scroll)
1567 	{
1568 		int i;
1569 
1570 		/*
1571 		 * This is nice to terminals with no alternate screen,
1572 		 * but with saved scrolled-off-the-top lines.  This way,
1573 		 * no previous line is lost, but we start with a whole
1574 		 * screen to ourself.
1575 		 */
1576 		for (i = 1; i < sc_height; i++)
1577 			putchr('\n');
1578 	} else
1579 		line_left();
1580 #else
1581 #if MSDOS_COMPILER==WIN32C
1582 	if (!no_init)
1583 		win32_init_term();
1584 #endif
1585 	initcolor();
1586 	flush();
1587 #endif
1588 	init_done = 1;
1589 }
1590 
1591 /*
1592  * Deinitialize terminal
1593  */
1594 	public void
1595 deinit()
1596 {
1597 	if (!init_done)
1598 		return;
1599 #if !MSDOS_COMPILER
1600 	if (!no_keypad)
1601 		tputs(sc_e_keypad, sc_height, putchr);
1602 	if (!no_init && !quit_if_one_screen)
1603 		tputs(sc_deinit, sc_height, putchr);
1604 #else
1605 	/* Restore system colors. */
1606 	SETCOLORS(sy_fg_color, sy_bg_color);
1607 #if MSDOS_COMPILER==WIN32C
1608 	if (!no_init)
1609 		win32_deinit_term();
1610 #else
1611 	/* Need clreol to make SETCOLORS take effect. */
1612 	clreol();
1613 #endif
1614 #endif
1615 	init_done = 0;
1616 }
1617 
1618 /*
1619  * Home cursor (move to upper left corner of screen).
1620  */
1621 	public void
1622 home()
1623 {
1624 #if !MSDOS_COMPILER
1625 	tputs(sc_home, 1, putchr);
1626 #else
1627 	flush();
1628 	_settextposition(1,1);
1629 #endif
1630 }
1631 
1632 /*
1633  * Add a blank line (called with cursor at home).
1634  * Should scroll the display down.
1635  */
1636 	public void
1637 add_line()
1638 {
1639 #if !MSDOS_COMPILER
1640 	tputs(sc_addline, sc_height, putchr);
1641 #else
1642 	flush();
1643 #if MSDOS_COMPILER==MSOFTC
1644 	_scrolltextwindow(_GSCROLLDOWN);
1645 	_settextposition(1,1);
1646 #else
1647 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1648 	movetext(1,1, sc_width,sc_height-1, 1,2);
1649 	gotoxy(1,1);
1650 	clreol();
1651 #else
1652 #if MSDOS_COMPILER==WIN32C
1653     {
1654 	CHAR_INFO fillchar;
1655 	SMALL_RECT rcSrc, rcClip;
1656 	COORD new_org;
1657 	CONSOLE_SCREEN_BUFFER_INFO csbi;
1658 
1659 	GetConsoleScreenBufferInfo(con_out,&csbi);
1660 
1661 	/* The clip rectangle is the entire visible screen. */
1662 	rcClip.Left = csbi.srWindow.Left;
1663 	rcClip.Top = csbi.srWindow.Top;
1664 	rcClip.Right = csbi.srWindow.Right;
1665 	rcClip.Bottom = csbi.srWindow.Bottom;
1666 
1667 	/* The source rectangle is the visible screen minus the last line. */
1668 	rcSrc = rcClip;
1669 	rcSrc.Bottom--;
1670 
1671 	/* Move the top left corner of the source window down one row. */
1672 	new_org.X = rcSrc.Left;
1673 	new_org.Y = rcSrc.Top + 1;
1674 
1675 	/* Fill the right character and attributes. */
1676 	fillchar.Char.AsciiChar = ' ';
1677 	curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1678 	fillchar.Attributes = curr_attr;
1679 	ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1680 	_settextposition(1,1);
1681     }
1682 #endif
1683 #endif
1684 #endif
1685 #endif
1686 }
1687 
1688 #if 0
1689 /*
1690  * Remove the n topmost lines and scroll everything below it in the
1691  * window upward.  This is needed to stop leaking the topmost line
1692  * into the scrollback buffer when we go down-one-line (in WIN32).
1693  */
1694 	public void
1695 remove_top(n)
1696 	int n;
1697 {
1698 #if MSDOS_COMPILER==WIN32C
1699 	SMALL_RECT rcSrc, rcClip;
1700 	CHAR_INFO fillchar;
1701 	COORD new_org;
1702 	CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */
1703 
1704 	if (n >= sc_height - 1)
1705 	{
1706 		clear();
1707 		home();
1708 		return;
1709 	}
1710 
1711 	flush();
1712 
1713 	GetConsoleScreenBufferInfo(con_out, &csbi);
1714 
1715 	/* Get the extent of all-visible-rows-but-the-last. */
1716 	rcSrc.Left    = csbi.srWindow.Left;
1717 	rcSrc.Top     = csbi.srWindow.Top + n;
1718 	rcSrc.Right   = csbi.srWindow.Right;
1719 	rcSrc.Bottom  = csbi.srWindow.Bottom;
1720 
1721 	/* Get the clip rectangle. */
1722 	rcClip.Left   = rcSrc.Left;
1723 	rcClip.Top    = csbi.srWindow.Top;
1724 	rcClip.Right  = rcSrc.Right;
1725 	rcClip.Bottom = rcSrc.Bottom ;
1726 
1727 	/* Move the source window up n rows. */
1728 	new_org.X = rcSrc.Left;
1729 	new_org.Y = rcSrc.Top - n;
1730 
1731 	/* Fill the right character and attributes. */
1732 	fillchar.Char.AsciiChar = ' ';
1733 	curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1734 	fillchar.Attributes = curr_attr;
1735 
1736 	ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1737 
1738 	/* Position cursor on first blank line. */
1739 	goto_line(sc_height - n - 1);
1740 #endif
1741 }
1742 #endif
1743 
1744 #if MSDOS_COMPILER==WIN32C
1745 /*
1746  * Clear the screen.
1747  */
1748 	static void
1749 win32_clear()
1750 {
1751 	/*
1752 	 * This will clear only the currently visible rows of the NT
1753 	 * console buffer, which means none of the precious scrollback
1754 	 * rows are touched making for faster scrolling.  Note that, if
1755 	 * the window has fewer columns than the console buffer (i.e.
1756 	 * there is a horizontal scrollbar as well), the entire width
1757 	 * of the visible rows will be cleared.
1758 	 */
1759 	COORD topleft;
1760 	DWORD nchars;
1761 	DWORD winsz;
1762 	CONSOLE_SCREEN_BUFFER_INFO csbi;
1763 
1764 	/* get the number of cells in the current buffer */
1765 	GetConsoleScreenBufferInfo(con_out, &csbi);
1766 	winsz = csbi.dwSize.X * (csbi.srWindow.Bottom - csbi.srWindow.Top + 1);
1767 	topleft.X = 0;
1768 	topleft.Y = csbi.srWindow.Top;
1769 
1770 	curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1771 	FillConsoleOutputCharacter(con_out, ' ', winsz, topleft, &nchars);
1772 	FillConsoleOutputAttribute(con_out, curr_attr, winsz, topleft, &nchars);
1773 }
1774 
1775 /*
1776  * Remove the n topmost lines and scroll everything below it in the
1777  * window upward.
1778  */
1779 	public void
1780 win32_scroll_up(n)
1781 	int n;
1782 {
1783 	SMALL_RECT rcSrc, rcClip;
1784 	CHAR_INFO fillchar;
1785 	COORD topleft;
1786 	COORD new_org;
1787 	DWORD nchars;
1788 	DWORD size;
1789 	CONSOLE_SCREEN_BUFFER_INFO csbi;
1790 
1791 	if (n <= 0)
1792 		return;
1793 
1794 	if (n >= sc_height - 1)
1795 	{
1796 		win32_clear();
1797 		_settextposition(1,1);
1798 		return;
1799 	}
1800 
1801 	/* Get the extent of what will remain visible after scrolling. */
1802 	GetConsoleScreenBufferInfo(con_out, &csbi);
1803 	rcSrc.Left    = csbi.srWindow.Left;
1804 	rcSrc.Top     = csbi.srWindow.Top + n;
1805 	rcSrc.Right   = csbi.srWindow.Right;
1806 	rcSrc.Bottom  = csbi.srWindow.Bottom;
1807 
1808 	/* Get the clip rectangle. */
1809 	rcClip.Left   = rcSrc.Left;
1810 	rcClip.Top    = csbi.srWindow.Top;
1811 	rcClip.Right  = rcSrc.Right;
1812 	rcClip.Bottom = rcSrc.Bottom ;
1813 
1814 	/* Move the source text to the top of the screen. */
1815 	new_org.X = rcSrc.Left;
1816 	new_org.Y = rcClip.Top;
1817 
1818 	/* Fill the right character and attributes. */
1819 	fillchar.Char.AsciiChar = ' ';
1820 	fillchar.Attributes = MAKEATTR(nm_fg_color, nm_bg_color);
1821 
1822 	/* Scroll the window. */
1823 	SetConsoleTextAttribute(con_out, fillchar.Attributes);
1824 	ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1825 
1826 	/* Clear remaining lines at bottom. */
1827 	topleft.X = csbi.dwCursorPosition.X;
1828 	topleft.Y = rcSrc.Bottom - n;
1829 	size = (n * csbi.dwSize.X) + (rcSrc.Right - topleft.X);
1830 	FillConsoleOutputCharacter(con_out, ' ', size, topleft,
1831 		&nchars);
1832 	FillConsoleOutputAttribute(con_out, fillchar.Attributes, size, topleft,
1833 		&nchars);
1834 	SetConsoleTextAttribute(con_out, curr_attr);
1835 
1836 	/* Move cursor n lines up from where it was. */
1837 	csbi.dwCursorPosition.Y -= n;
1838 	SetConsoleCursorPosition(con_out, csbi.dwCursorPosition);
1839 }
1840 #endif
1841 
1842 /*
1843  * Move cursor to lower left corner of screen.
1844  */
1845 	public void
1846 lower_left()
1847 {
1848 	if (!init_done)
1849 		return;
1850 #if !MSDOS_COMPILER
1851 	tputs(sc_lower_left, 1, putchr);
1852 #else
1853 	flush();
1854 	_settextposition(sc_height, 1);
1855 #endif
1856 }
1857 
1858 /*
1859  * Move cursor to left position of current line.
1860  */
1861 	public void
1862 line_left()
1863 {
1864 #if !MSDOS_COMPILER
1865 	tputs(sc_return, 1, putchr);
1866 #else
1867 	int row;
1868 	flush();
1869 #if MSDOS_COMPILER==WIN32C
1870 	{
1871 		CONSOLE_SCREEN_BUFFER_INFO scr;
1872 		GetConsoleScreenBufferInfo(con_out, &scr);
1873 		row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
1874 	}
1875 #else
1876 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1877 		row = wherey();
1878 #else
1879 	{
1880 		struct rccoord tpos = _gettextposition();
1881 		row = tpos.row;
1882 	}
1883 #endif
1884 #endif
1885 	_settextposition(row, 1);
1886 #endif
1887 }
1888 
1889 /*
1890  * Check if the console size has changed and reset internals
1891  * (in lieu of SIGWINCH for WIN32).
1892  */
1893 	public void
1894 check_winch()
1895 {
1896 #if MSDOS_COMPILER==WIN32C
1897 	CONSOLE_SCREEN_BUFFER_INFO scr;
1898 	COORD size;
1899 
1900 	if (con_out == INVALID_HANDLE_VALUE)
1901 		return;
1902 
1903 	flush();
1904 	GetConsoleScreenBufferInfo(con_out, &scr);
1905 	size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
1906 	size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
1907 	if (size.Y != sc_height || size.X != sc_width)
1908 	{
1909 		sc_height = size.Y;
1910 		sc_width = size.X;
1911 		if (!no_init && con_out_ours == con_out)
1912 			SetConsoleScreenBufferSize(con_out, size);
1913 		pos_init();
1914 		wscroll = (sc_height + 1) / 2;
1915 		screen_trashed = 1;
1916 	}
1917 #endif
1918 }
1919 
1920 /*
1921  * Goto a specific line on the screen.
1922  */
1923 	public void
1924 goto_line(sindex)
1925 	int sindex;
1926 {
1927 #if !MSDOS_COMPILER
1928 	tputs(tgoto(sc_move, 0, sindex), 1, putchr);
1929 #else
1930 	flush();
1931 	_settextposition(sindex+1, 1);
1932 #endif
1933 }
1934 
1935 #if MSDOS_COMPILER==MSOFTC || MSDOS_COMPILER==BORLANDC
1936 /*
1937  * Create an alternate screen which is all white.
1938  * This screen is used to create a "flash" effect, by displaying it
1939  * briefly and then switching back to the normal screen.
1940  * {{ Yuck!  There must be a better way to get a visual bell. }}
1941  */
1942 	static void
1943 create_flash()
1944 {
1945 #if MSDOS_COMPILER==MSOFTC
1946 	struct videoconfig w;
1947 	char *blanks;
1948 	int row, col;
1949 
1950 	_getvideoconfig(&w);
1951 	videopages = w.numvideopages;
1952 	if (videopages < 2)
1953 	{
1954 		at_enter(AT_STANDOUT);
1955 		at_exit();
1956 	} else
1957 	{
1958 		_setactivepage(1);
1959 		at_enter(AT_STANDOUT);
1960 		blanks = (char *) ecalloc(w.numtextcols, sizeof(char));
1961 		for (col = 0;  col < w.numtextcols;  col++)
1962 			blanks[col] = ' ';
1963 		for (row = w.numtextrows;  row > 0;  row--)
1964 			_outmem(blanks, w.numtextcols);
1965 		_setactivepage(0);
1966 		_setvisualpage(0);
1967 		free(blanks);
1968 		at_exit();
1969 	}
1970 #else
1971 #if MSDOS_COMPILER==BORLANDC
1972 	int n;
1973 
1974 	whitescreen = (unsigned short *)
1975 		malloc(sc_width * sc_height * sizeof(short));
1976 	if (whitescreen == NULL)
1977 		return;
1978 	for (n = 0;  n < sc_width * sc_height;  n++)
1979 		whitescreen[n] = 0x7020;
1980 #else
1981 #if MSDOS_COMPILER==WIN32C
1982 	int n;
1983 
1984 	whitescreen = (WORD *)
1985 		malloc(sc_height * sc_width * sizeof(WORD));
1986 	if (whitescreen == NULL)
1987 		return;
1988 	/* Invert the standard colors. */
1989 	for (n = 0;  n < sc_width * sc_height;  n++)
1990 		whitescreen[n] = (WORD)((nm_fg_color << 4) | nm_bg_color);
1991 #endif
1992 #endif
1993 #endif
1994 	flash_created = 1;
1995 }
1996 #endif /* MSDOS_COMPILER */
1997 
1998 /*
1999  * Output the "visual bell", if there is one.
2000  */
2001 	public void
2002 vbell()
2003 {
2004 #if !MSDOS_COMPILER
2005 	if (*sc_visual_bell == '\0')
2006 		return;
2007 	tputs(sc_visual_bell, sc_height, putchr);
2008 #else
2009 #if MSDOS_COMPILER==DJGPPC
2010 	ScreenVisualBell();
2011 #else
2012 #if MSDOS_COMPILER==MSOFTC
2013 	/*
2014 	 * Create a flash screen on the second video page.
2015 	 * Switch to that page, then switch back.
2016 	 */
2017 	if (!flash_created)
2018 		create_flash();
2019 	if (videopages < 2)
2020 		return;
2021 	_setvisualpage(1);
2022 	delay(100);
2023 	_setvisualpage(0);
2024 #else
2025 #if MSDOS_COMPILER==BORLANDC
2026 	unsigned short *currscreen;
2027 
2028 	/*
2029 	 * Get a copy of the current screen.
2030 	 * Display the flash screen.
2031 	 * Then restore the old screen.
2032 	 */
2033 	if (!flash_created)
2034 		create_flash();
2035 	if (whitescreen == NULL)
2036 		return;
2037 	currscreen = (unsigned short *)
2038 		malloc(sc_width * sc_height * sizeof(short));
2039 	if (currscreen == NULL) return;
2040 	gettext(1, 1, sc_width, sc_height, currscreen);
2041 	puttext(1, 1, sc_width, sc_height, whitescreen);
2042 	delay(100);
2043 	puttext(1, 1, sc_width, sc_height, currscreen);
2044 	free(currscreen);
2045 #else
2046 #if MSDOS_COMPILER==WIN32C
2047 	/* paint screen with an inverse color */
2048 	clear();
2049 
2050 	/* leave it displayed for 100 msec. */
2051 	Sleep(100);
2052 
2053 	/* restore with a redraw */
2054 	repaint();
2055 #endif
2056 #endif
2057 #endif
2058 #endif
2059 #endif
2060 }
2061 
2062 /*
2063  * Make a noise.
2064  */
2065 	static void
2066 beep()
2067 {
2068 #if !MSDOS_COMPILER
2069 	putchr(CONTROL('G'));
2070 #else
2071 #if MSDOS_COMPILER==WIN32C
2072 	MessageBeep(0);
2073 #else
2074 	write(1, "\7", 1);
2075 #endif
2076 #endif
2077 }
2078 
2079 /*
2080  * Ring the terminal bell.
2081  */
2082 	public void
2083 bell()
2084 {
2085 	if (quiet == VERY_QUIET)
2086 		vbell();
2087 	else
2088 		beep();
2089 }
2090 
2091 /*
2092  * Clear the screen.
2093  */
2094 	public void
2095 clear()
2096 {
2097 #if !MSDOS_COMPILER
2098 	tputs(sc_clear, sc_height, putchr);
2099 #else
2100 	flush();
2101 #if MSDOS_COMPILER==WIN32C
2102 	win32_clear();
2103 #else
2104 	_clearscreen(_GCLEARSCREEN);
2105 #endif
2106 #endif
2107 }
2108 
2109 /*
2110  * Clear from the cursor to the end of the cursor's line.
2111  * {{ This must not move the cursor. }}
2112  */
2113 	public void
2114 clear_eol()
2115 {
2116 #if !MSDOS_COMPILER
2117 	tputs(sc_eol_clear, 1, putchr);
2118 #else
2119 #if MSDOS_COMPILER==MSOFTC
2120 	short top, left;
2121 	short bot, right;
2122 	struct rccoord tpos;
2123 
2124 	flush();
2125 	/*
2126 	 * Save current state.
2127 	 */
2128 	tpos = _gettextposition();
2129 	_gettextwindow(&top, &left, &bot, &right);
2130 	/*
2131 	 * Set a temporary window to the current line,
2132 	 * from the cursor's position to the right edge of the screen.
2133 	 * Then clear that window.
2134 	 */
2135 	_settextwindow(tpos.row, tpos.col, tpos.row, sc_width);
2136 	_clearscreen(_GWINDOW);
2137 	/*
2138 	 * Restore state.
2139 	 */
2140 	_settextwindow(top, left, bot, right);
2141 	_settextposition(tpos.row, tpos.col);
2142 #else
2143 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2144 	flush();
2145 	clreol();
2146 #else
2147 #if MSDOS_COMPILER==WIN32C
2148 	DWORD           nchars;
2149 	COORD           cpos;
2150 	CONSOLE_SCREEN_BUFFER_INFO scr;
2151 
2152 	flush();
2153 	memset(&scr, 0, sizeof(scr));
2154 	GetConsoleScreenBufferInfo(con_out, &scr);
2155 	cpos.X = scr.dwCursorPosition.X;
2156 	cpos.Y = scr.dwCursorPosition.Y;
2157 	curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
2158 	FillConsoleOutputAttribute(con_out, curr_attr,
2159 		scr.dwSize.X - cpos.X, cpos, &nchars);
2160 	FillConsoleOutputCharacter(con_out, ' ',
2161 		scr.dwSize.X - cpos.X, cpos, &nchars);
2162 #endif
2163 #endif
2164 #endif
2165 #endif
2166 }
2167 
2168 /*
2169  * Clear the current line.
2170  * Clear the screen if there's off-screen memory below the display.
2171  */
2172 	static void
2173 clear_eol_bot()
2174 {
2175 #if MSDOS_COMPILER
2176 	clear_eol();
2177 #else
2178 	if (below_mem)
2179 		tputs(sc_eos_clear, 1, putchr);
2180 	else
2181 		tputs(sc_eol_clear, 1, putchr);
2182 #endif
2183 }
2184 
2185 /*
2186  * Clear the bottom line of the display.
2187  * Leave the cursor at the beginning of the bottom line.
2188  */
2189 	public void
2190 clear_bot()
2191 {
2192 	/*
2193 	 * If we're in a non-normal attribute mode, temporarily exit
2194 	 * the mode while we do the clear.  Some terminals fill the
2195 	 * cleared area with the current attribute.
2196 	 */
2197 	if (oldbot)
2198 		lower_left();
2199 	else
2200 		line_left();
2201 
2202 	if (attrmode == AT_NORMAL)
2203 		clear_eol_bot();
2204 	else
2205 	{
2206 		int saved_attrmode = attrmode;
2207 
2208 		at_exit();
2209 		clear_eol_bot();
2210 		at_enter(saved_attrmode);
2211 	}
2212 }
2213 
2214 	public void
2215 at_enter(attr)
2216 	int attr;
2217 {
2218 	attr = apply_at_specials(attr);
2219 
2220 #if !MSDOS_COMPILER
2221 	/* The one with the most priority is last.  */
2222 	if (attr & AT_UNDERLINE)
2223 		tputs(sc_u_in, 1, putchr);
2224 	if (attr & AT_BOLD)
2225 		tputs(sc_b_in, 1, putchr);
2226 	if (attr & AT_BLINK)
2227 		tputs(sc_bl_in, 1, putchr);
2228 	if (attr & AT_STANDOUT)
2229 		tputs(sc_s_in, 1, putchr);
2230 #else
2231 	flush();
2232 	/* The one with the most priority is first.  */
2233 	if (attr & AT_STANDOUT)
2234 	{
2235 		SETCOLORS(so_fg_color, so_bg_color);
2236 	} else if (attr & AT_BLINK)
2237 	{
2238 		SETCOLORS(bl_fg_color, bl_bg_color);
2239 	}
2240 	else if (attr & AT_BOLD)
2241 	{
2242 		SETCOLORS(bo_fg_color, bo_bg_color);
2243 	}
2244 	else if (attr & AT_UNDERLINE)
2245 	{
2246 		SETCOLORS(ul_fg_color, ul_bg_color);
2247 	}
2248 #endif
2249 
2250 	attrmode = attr;
2251 }
2252 
2253 	public void
2254 at_exit()
2255 {
2256 #if !MSDOS_COMPILER
2257 	/* Undo things in the reverse order we did them.  */
2258 	if (attrmode & AT_STANDOUT)
2259 		tputs(sc_s_out, 1, putchr);
2260 	if (attrmode & AT_BLINK)
2261 		tputs(sc_bl_out, 1, putchr);
2262 	if (attrmode & AT_BOLD)
2263 		tputs(sc_b_out, 1, putchr);
2264 	if (attrmode & AT_UNDERLINE)
2265 		tputs(sc_u_out, 1, putchr);
2266 #else
2267 	flush();
2268 	SETCOLORS(nm_fg_color, nm_bg_color);
2269 #endif
2270 
2271 	attrmode = AT_NORMAL;
2272 }
2273 
2274 	public void
2275 at_switch(attr)
2276 	int attr;
2277 {
2278 	int new_attrmode = apply_at_specials(attr);
2279 	int ignore_modes = AT_ANSI;
2280 
2281 	if ((new_attrmode & ~ignore_modes) != (attrmode & ~ignore_modes))
2282 	{
2283 		at_exit();
2284 		at_enter(attr);
2285 	}
2286 }
2287 
2288 	public int
2289 is_at_equiv(attr1, attr2)
2290 	int attr1;
2291 	int attr2;
2292 {
2293 	attr1 = apply_at_specials(attr1);
2294 	attr2 = apply_at_specials(attr2);
2295 
2296 	return (attr1 == attr2);
2297 }
2298 
2299 	public int
2300 apply_at_specials(attr)
2301 	int attr;
2302 {
2303 	if (attr & AT_BINARY)
2304 		attr |= binattr;
2305 	if (attr & AT_HILITE)
2306 		attr |= AT_STANDOUT;
2307 	attr &= ~(AT_BINARY|AT_HILITE);
2308 
2309 	return attr;
2310 }
2311 
2312 #if 0 /* No longer used */
2313 /*
2314  * Erase the character to the left of the cursor
2315  * and move the cursor left.
2316  */
2317 	public void
2318 backspace()
2319 {
2320 #if !MSDOS_COMPILER
2321 	/*
2322 	 * Erase the previous character by overstriking with a space.
2323 	 */
2324 	tputs(sc_backspace, 1, putchr);
2325 	putchr(' ');
2326 	tputs(sc_backspace, 1, putchr);
2327 #else
2328 #if MSDOS_COMPILER==MSOFTC
2329 	struct rccoord tpos;
2330 
2331 	flush();
2332 	tpos = _gettextposition();
2333 	if (tpos.col <= 1)
2334 		return;
2335 	_settextposition(tpos.row, tpos.col-1);
2336 	_outtext(" ");
2337 	_settextposition(tpos.row, tpos.col-1);
2338 #else
2339 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2340 	cputs("\b");
2341 #else
2342 #if MSDOS_COMPILER==WIN32C
2343 	COORD cpos;
2344 	DWORD cChars;
2345 	CONSOLE_SCREEN_BUFFER_INFO scr;
2346 
2347 	flush();
2348 	GetConsoleScreenBufferInfo(con_out, &scr);
2349 	cpos = scr.dwCursorPosition;
2350 	if (cpos.X <= 0)
2351 		return;
2352 	cpos.X--;
2353 	SetConsoleCursorPosition(con_out, cpos);
2354 	FillConsoleOutputCharacter(con_out, (TCHAR)' ', 1, cpos, &cChars);
2355 	SetConsoleCursorPosition(con_out, cpos);
2356 #endif
2357 #endif
2358 #endif
2359 #endif
2360 }
2361 #endif /* 0 */
2362 
2363 /*
2364  * Output a plain backspace, without erasing the previous char.
2365  */
2366 	public void
2367 putbs()
2368 {
2369 #if !MSDOS_COMPILER
2370 	tputs(sc_backspace, 1, putchr);
2371 #else
2372 	int row, col;
2373 
2374 	flush();
2375 	{
2376 #if MSDOS_COMPILER==MSOFTC
2377 		struct rccoord tpos;
2378 		tpos = _gettextposition();
2379 		row = tpos.row;
2380 		col = tpos.col;
2381 #else
2382 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2383 		row = wherey();
2384 		col = wherex();
2385 #else
2386 #if MSDOS_COMPILER==WIN32C
2387 		CONSOLE_SCREEN_BUFFER_INFO scr;
2388 		GetConsoleScreenBufferInfo(con_out, &scr);
2389 		row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
2390 		col = scr.dwCursorPosition.X - scr.srWindow.Left + 1;
2391 #endif
2392 #endif
2393 #endif
2394 	}
2395 	if (col <= 1)
2396 		return;
2397 	_settextposition(row, col-1);
2398 #endif /* MSDOS_COMPILER */
2399 }
2400 
2401 #if MSDOS_COMPILER==WIN32C
2402 /*
2403  * Determine whether an input character is waiting to be read.
2404  */
2405 	static int
2406 win32_kbhit(tty)
2407 	HANDLE tty;
2408 {
2409 	INPUT_RECORD ip;
2410 	DWORD read;
2411 
2412 	if (keyCount > 0)
2413 		return (TRUE);
2414 
2415 	currentKey.ascii = 0;
2416 	currentKey.scan = 0;
2417 
2418 	/*
2419 	 * Wait for a real key-down event, but
2420 	 * ignore SHIFT and CONTROL key events.
2421 	 */
2422 	do
2423 	{
2424 		PeekConsoleInput(tty, &ip, 1, &read);
2425 		if (read == 0)
2426 			return (FALSE);
2427 		ReadConsoleInput(tty, &ip, 1, &read);
2428 	} while (ip.EventType != KEY_EVENT ||
2429 		ip.Event.KeyEvent.bKeyDown != TRUE ||
2430 		ip.Event.KeyEvent.wVirtualScanCode == 0 ||
2431 		ip.Event.KeyEvent.wVirtualKeyCode == VK_SHIFT ||
2432 		ip.Event.KeyEvent.wVirtualKeyCode == VK_CONTROL ||
2433 		ip.Event.KeyEvent.wVirtualKeyCode == VK_MENU);
2434 
2435 	currentKey.ascii = ip.Event.KeyEvent.uChar.AsciiChar;
2436 	currentKey.scan = ip.Event.KeyEvent.wVirtualScanCode;
2437 	keyCount = ip.Event.KeyEvent.wRepeatCount;
2438 
2439 	if (ip.Event.KeyEvent.dwControlKeyState &
2440 		(LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED))
2441 	{
2442 		switch (currentKey.scan)
2443 		{
2444 		case PCK_ALT_E:     /* letter 'E' */
2445 			currentKey.ascii = 0;
2446 			break;
2447 		}
2448 	} else if (ip.Event.KeyEvent.dwControlKeyState &
2449 		(LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED))
2450 	{
2451 		switch (currentKey.scan)
2452 		{
2453 		case PCK_RIGHT: /* right arrow */
2454 			currentKey.scan = PCK_CTL_RIGHT;
2455 			break;
2456 		case PCK_LEFT: /* left arrow */
2457 			currentKey.scan = PCK_CTL_LEFT;
2458 			break;
2459 		case PCK_DELETE: /* delete */
2460 			currentKey.scan = PCK_CTL_DELETE;
2461 			break;
2462 		}
2463 	} else if (ip.Event.KeyEvent.dwControlKeyState & SHIFT_PRESSED)
2464 	{
2465 		switch (currentKey.scan)
2466 		{
2467 		case PCK_SHIFT_TAB: /* tab */
2468 			currentKey.ascii = 0;
2469 			break;
2470 		}
2471 	}
2472 
2473 	return (TRUE);
2474 }
2475 
2476 /*
2477  * Read a character from the keyboard.
2478  */
2479 	public char
2480 WIN32getch(tty)
2481 	int tty;
2482 {
2483 	int ascii;
2484 
2485 	if (pending_scancode)
2486 	{
2487 		pending_scancode = 0;
2488 		return ((char)(currentKey.scan & 0x00FF));
2489 	}
2490 
2491 	while (win32_kbhit((HANDLE)tty) == FALSE)
2492 	{
2493 		Sleep(20);
2494 		if (ABORT_SIGS())
2495 			return ('\003');
2496 		continue;
2497 	}
2498 	keyCount --;
2499 	ascii = currentKey.ascii;
2500 	/*
2501 	 * On PC's, the extended keys return a 2 byte sequence beginning
2502 	 * with '00', so if the ascii code is 00, the next byte will be
2503 	 * the lsb of the scan code.
2504 	 */
2505 	pending_scancode = (ascii == 0x00);
2506 	return ((char)ascii);
2507 }
2508 #endif
2509 
2510 #if MSDOS_COMPILER
2511 /*
2512  */
2513 	public void
2514 WIN32setcolors(fg, bg)
2515 	int fg;
2516 	int bg;
2517 {
2518 	SETCOLORS(fg, bg);
2519 }
2520 
2521 /*
2522  */
2523 	public void
2524 WIN32textout(text, len)
2525 	char *text;
2526 	int len;
2527 {
2528 #if MSDOS_COMPILER==WIN32C
2529 	DWORD written;
2530 	if (utf_mode == 2)
2531 	{
2532 		/*
2533 		 * We've got UTF-8 text in a non-UTF-8 console.  Convert it to
2534 		 * wide and use WriteConsoleW.
2535 		 */
2536 		WCHAR wtext[1024];
2537 		len = MultiByteToWideChar(CP_UTF8, 0, text, len, wtext,
2538 					  sizeof(wtext)/sizeof(*wtext));
2539 		WriteConsoleW(con_out, wtext, len, &written, NULL);
2540 	} else
2541 		WriteConsole(con_out, text, len, &written, NULL);
2542 #else
2543 	char c = text[len];
2544 	text[len] = '\0';
2545 	cputs(text);
2546 	text[len] = c;
2547 #endif
2548 }
2549 #endif
2550