Fix:	SE031

Problem:
	Colours don't work properly under Linux (affects Debian's xterms and
	both Debian and RedHat's consoles, possibly others).

	There are a number of problems here.
	
	Firstly, the termcap code was using hardcoded ANSI escape sequences
	for colours, but using the HE value read from the termcap database
	to clear them. This causes the infamous "leaky colours" if HE does
	not change the colours. I've gone for the sledgehammer approach of
	using ESC [ 0 m to clear them since this should work on just about
	any terminal which understands ANSI escape sequences. It would
	break any attempt by NetHack/Slash'EM to clear colour while preserving
	some other attribute (bold, standout etc.), but as far as I know,
	this never happens.

	Secondly, the terminfo code assumes that the Sf and AF codes to set
	the foreground colour are equivalent. At least under version 4.2 of
	ncurses (which Linux uses), this is not the case. AF sets the colours
	according to a RGB model and Sf according to a BGR model. curses.h
	defines the COLOR_FOO macros according to the RGB model regardless
	causing reds and blues to be switched around. We solve this by
	manually swapping red and blue if we decide to use Sf under ncurses.

	Finally, I believe AF should be preferred over Sf, because other
	curses packages may have similar characteristics to ncurses and
	the swapping code is only active for an ncurses implementation.

	Note that the terminfo code (enabled with TERMINFO in config.h)
	is the better option for Linux.

	Thanks to the following for their help in testing my theories and/or
	for providing patches to address the problem:
		Matt Reishus
		David Damerell
		Peter Makholm
		Kalle Sandstroem
		Kresimir Kukulj

Compatible with:
	Slash'EM 0.0.5E5 through 0.0.5E7
	NetHack 3.2.2 plus SE008

Author: J. Ali Harlow, ali@avrc.city.ac.uk

Date:	7 Dec 1999

*** win/tty/termcap.c.orig	Sun Dec  5 16:17:57 1999
--- win/tty/termcap.c	Tue Dec  7 15:53:13 1999
***************
*** 816,822 ****
  #  endif
  #define COLOR_BLACK COLOR_BLUE
  
! const int ti_map[8] = {
  	COLOR_BLACK, COLOR_RED, COLOR_GREEN, COLOR_YELLOW,
  	COLOR_BLUE, COLOR_MAGENTA, COLOR_CYAN, COLOR_WHITE };
  
--- 816,825 ----
  #  endif
  #define COLOR_BLACK COLOR_BLUE
  
! #ifndef NCURSES_VERSION
! const
! #endif
! int ti_map[8] = {
  	COLOR_BLACK, COLOR_RED, COLOR_GREEN, COLOR_YELLOW,
  	COLOR_BLUE, COLOR_MAGENTA, COLOR_CYAN, COLOR_WHITE };
  
***************
*** 824,831 ****
  init_hilite()
  {
  	register int c;
! 	char *setf, *scratch;
  	extern char *tparm();
  
  	for (c = 0; c < SIZE(hilites); c++)
  		hilites[c] = HI;
--- 827,836 ----
  init_hilite()
  {
  	register int c;
! 	char *setf, *setaf, *scratch;
! #ifndef NCURSES_VERSION
  	extern char *tparm();
+ #endif
  
  	for (c = 0; c < SIZE(hilites); c++)
  		hilites[c] = HI;
***************
*** 834,842 ****
  
  	if (tgetnum("Co") < 8)
  		return;
! 	if ((setf = tgetstr("Sf", (char **)0)) == (char *)0
! 	  && (setf = tgetstr("AF", (char **)0)) == (char *)0)
  		return;
  
  	for (c = 0; c < CLR_MAX / 2; c++) {
  		scratch = tparm(setf, ti_map[c]);
--- 839,872 ----
  
  	if (tgetnum("Co") < 8)
  		return;
! 	setf = tgetstr("Sf", (char **)0);
! 	setaf = tgetstr("AF", (char **)0);
! 	if (!setf && !setaf)
  		return;
+ 	/*
+ 	 * Prefer ANSI version if defined in case other curses packages
+ 	 * do similar colour re-mappings to ncurses.
+ 	 */
+ 	if (setaf)
+ 		setf=setaf;
+ #ifdef NCURSES_VERSION
+ 	else
+ 	{
+ 		/*
+ 		 * ALI
+ 		 *
+ 		 * ncurses seems to switch from RGB to BGR if
+ 		 * you use setf rather than setaf. This is despite
+ 		 * the values for COLOR_FOO in curses.h which
+ 		 * always remain RGB. Tested against ncurses v4.2
+ 		 */
+ #define SWAP_COLOR(c1,c2) (c=ti_map[c1],ti_map[c1]=ti_map[c2],ti_map[c2]=c)
+ 		SWAP_COLOR(CLR_RED,CLR_BLUE);
+ 		SWAP_COLOR(CLR_CYAN,CLR_YELLOW);
+ 		ti_map[CLR_BLACK]=ti_map[CLR_BLUE];
+ #undef SWAP_COLOR
+ 	}
+ #endif
  
  	for (c = 0; c < CLR_MAX / 2; c++) {
  		scratch = tparm(setf, ti_map[c]);
***************
*** 970,976 ****
  	for (c = 0; c < SIZE(hilites); c++)
  	    hilites[c] = HI;
  	hilites[CLR_GRAY] = hilites[NO_COLOR] = (char *)0;
! 	hilite_end = HE;
  
  	analyze_seq(HI, &hi_foreg, &hi_backg);
  	analyze_seq(HE, &foreg, &backg);
--- 1000,1006 ----
  	for (c = 0; c < SIZE(hilites); c++)
  	    hilites[c] = HI;
  	hilites[CLR_GRAY] = hilites[NO_COLOR] = (char *)0;
! 	hilite_end = "\033[0m";
  
  	analyze_seq(HI, &hi_foreg, &hi_backg);
  	analyze_seq(HE, &foreg, &backg);