subs.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

static char sccsid[] = "	subs.c	4.2	82/11/27	";

#include <stdio.h>
#include "back.h"

int	buffnum;
char	outbuff[BUFSIZ];

static char	plred[] = "Player is red, computer is white.";
static char	plwhite[] = "Player is white, computer is red.";
static char	nocomp[] = "(No computer play.)";

char  *descr[] = {
	"Usage:  backgammon [-] [n r w b pr pw pb t3a]\n",
	"\t-\tgets this list\n\tn\tdon't ask for rules or instructions",
	"\tr\tplayer is red (implies n)\n\tw\tplayer is white (implies n)",
	"\tb\ttwo players, red and white (implies n)",
	"\tpr\tprint the board before red's turn",
	"\tpw\tprint the board before white's turn",
	"\tpb\tprint the board before both player's turn",
	"\tterm\tterminal is a term",
	"\tsfile\trecover saved game from file",
	0
};

errexit (s)
register char	*s;
{
	write (2,"\n",1);
	perror (s);
	getout();
}

strset (s1,s2)
register char	*s1, *s2;
{
	while ( (*s1++ = *s2++) != '\0');
}

addbuf (c)
register char	c;

{
	buffnum++;
	if (buffnum == BUFSIZ)  {
		if (write(1,outbuff,BUFSIZ) != BUFSIZ)
			errexit ("addbuf (write):");
		buffnum = 0;
	}
	outbuff[buffnum] = c;
}

buflush ()  {
	if (buffnum < 0)
		return;
	buffnum++;
	if (write (1,outbuff,buffnum) != buffnum)
		errexit ("buflush (write):");
	buffnum = -1;
}

readc () {
	char	c;

	if (tflag)  {
		cline();
		newpos();
	}
	buflush();
	if (read(0,&c,1) != 1)
		errexit ("readc");
	if (c == '\177')
		getout();
	if (c == '\033' || c == '\015')
		return ('\n');
	if (cflag)
		return (c);
	if (c == '\014')
		return ('R');
	if (c >= 'a' && c <= 'z')
		return (c & 0137);
	return (c);
}

writec (c)
char	c;
{
	if (tflag)
		fancyc (c);
	else
		addbuf (c);
}

writel (l)
register char	*l;
{
#ifdef DEBUG
	register char	*s;

	if (trace == NULL)
		trace = fopen ("bgtrace","w");
	
	fprintf (trace,"writel: \"");
	for (s = l; *s; s++) {
		if (*s < ' ' || *s == '\177')
			fprintf (trace,"^%c",(*s)^0100);
		else
			putc (*s,trace);
	}
	fprintf (trace,"\"\n");
	fflush (trace);
#endif

	while (*l)
		writec (*l++);
}

proll ()   {
	if (d0)
		swap;
	if (cturn == 1)
		writel ("Red's roll:  ");
	else
		writel ("White's roll:  ");
	writec (D0+'0');
	writec ('\040');
	writec (D1+'0');
	if (tflag)
		cline();
}

wrint (n)
int	n;
{
	register int	i, j, t;

	for (i = 4; i > 0; i--)  {
		t = 1;
		for (j = 0; j<i; j++)
			t *= 10;
		if (n > t-1)
			writec ((n/t)%10+'0');
	}
	writec (n%10+'0');
}

gwrite()  {
	register int	r, c;

	if (tflag)  {
		r = curr;
		c = curc;
		curmove (16,0);
	}

	if (gvalue > 1)  {
		writel ("Game value:  ");
		wrint (gvalue);
		writel (".  ");
		if (dlast == -1)
			writel (color[0]);
		else
			writel (color[1]);
		writel (" doubled last.");
	} else  {
		switch (pnum)  {
		case -1:			    /* player is red */
			writel (plred);
			break;
		case 0:				    /* player is both colors */
			writel (nocomp);
			break;
		case 1:				    /* player is white */
			writel (plwhite);
		}
	}

	if (rscore || wscore)  {
		writel ("  ");
		wrscore();
	}

	if (tflag)  {
		cline();
		curmove (r,c);
	}
}

quit ()  {
	register int	i;

	if (tflag)  {
		curmove (20,0);
		clend();
	} else
		writec ('\n');
	writel ("Are you sure you want to quit?");
	if (yorn (0))  {
		if (rfl)  {
			writel ("Would you like to save this game?");
			if (yorn(0))
				save(0);
		}
		cturn = 0;
		return (1);
	}
	return (0);
}

yorn (special)
register char	special;			/* special response */
{
	register char	c;
	register int	i;

	i = 1;
	while ( (c = readc()) != 'Y' && c != 'N')  {
		if (special && c == special)
			return (2);
		if (i)  {
			if (special)  {
				writel ("  (Y, N, or ");
				writec (special);
				writec (')');
			} else
				writel ("  (Y or N)");
			i = 0;
		} else
			writec ('\007');
	}
	if (c == 'Y')
		writel ("  Yes.\n");
	else
		writel ("  No.\n");
	if (tflag)
		buflush();
	return (c == 'Y');
}

wrhit (i)
register int	i;
{
	writel ("Blot hit on ");
	wrint (i);
	writec ('.');
	writec ('\n');
}

nexturn ()  {
	register int	c;

	cturn = -cturn;
	c = cturn/abs(cturn);
	home = bar;
	bar = 25-bar;
	offptr += c;
	offopp -= c;
	inptr += c;
	inopp -= c;
	Colorptr += c;
	colorptr += c;
}

getarg (arg)
register char	***arg;

{
	register char	**s;

	/* process arguments here.  dashes are ignored, nbrw are ignored
	   if the game is being recovered */

	s = *arg;
	while (s[0][0] == '-') {
		switch (s[0][1])  {

		/* don't ask if rules or instructions needed */
		case 'n':
			if (rflag)
				break;
			aflag = 0;
			args[acnt++] = 'n';
			break;

		/* player is both read and white */
		case 'b':
			if (rflag)
				break;
			pnum = 0;
			aflag = 0;
			args[acnt++] = 'b';
			break;

		/* player is red */
		case 'r':
			if (rflag)
				break;
			pnum = -1;
			aflag = 0;
			args[acnt++] = 'r';
			break;

		/* player is white */
		case 'w':
			if (rflag)
				break;
			pnum = 1;
			aflag = 0;
			args[acnt++] = 'w';
			break;

		/* print board after move according to following character */
		case 'p':
			if (s[0][2] != 'r' && s[0][2] != 'w' && s[0][2] != 'b')
				break;
			args[acnt++] = 'p';
			args[acnt++] = s[0][2];
			if (s[0][2] == 'r')
				bflag = 1;
			if (s[0][2] == 'w')
				bflag = -1;
			if (s[0][2] == 'b')
				bflag = 0;
			break;

		case 't':
			if (s[0][2] == '\0') {	/* get terminal caps */
				s++;
				tflag = getcaps (*s);
			} else
				tflag = getcaps (&s[0][2]);
			break;

		case 's':
			s++;
			/* recover file */
			recover (s[0]);
			break;
		}
		s++;
	}
	if (s[0] != 0)
		recover(s[0]);
}

init ()  {
	register int	i;
	for (i = 0; i < 26;)
		board[i++] = 0;
	board[1] = 2;
	board[6] = board[13] = -5;
	board[8] = -3;
	board[12] = board[19] = 5;
	board[17] = 3;
	board[24] = -2;
	off[0] = off[1] = -15;
	in[0] = in[1] = 5;
	gvalue = 1;
	dlast = 0;
}

wrscore ()  {
	writel ("Score:  ");
	writel (color[1]);
	writec (' ');
	wrint (rscore);
	writel (", ");
	writel (color[0]);
	writec (' ');
	wrint (wscore);
}

fixtty (mode)
int	mode;
{
	if (tflag)
		newpos();
	buflush();
	tty.sg_flags = mode;
	if (stty (0,&tty) < 0)
		errexit("fixtty");
}

getout ()  {
	/* go to bottom of screen */
	if (tflag)  {
		curmove (23,0);
		cline();
	} else
		writec ('\n');

	/* fix terminal status */
	fixtty (old);
	exit();
}
roll ()  {
	register char	c;
	register int	row;
	register int	col;

	if (iroll)  {
		if (tflag)  {
			row = curr;
			col = curc;
			curmove (17,0);
		} else
			writec ('\n');
		writel ("ROLL: ");
		c = readc();
		if (c != '\n')  {
			while (c < '1' || c > '6')
				c = readc();
			D0 = c-'0';
			writec (' ');
			writec (c);
			c = readc();
			while (c < '1' || c > '6')
				c = readc();
			D1 = c-'0';
			writec (' ');
			writec (c);
			if (tflag)  {
				curmove (17,0);
				cline();
				curmove (row,col);
			} else
				writec ('\n');
			return;
		}
		if (tflag)  {
			curmove (17,0);
			cline();
			curmove (row,col);
		} else
			writec ('\n');
	}
	D0 = rnum(6)+1;
	D1 = rnum(6)+1;
	d0 = 0;
}