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freebsd-dev/games/backgammon/common_source/backgammon.c
Jordan K. Hubbard 554eb505f8 Bring in the 4.4 Lite games directory, modulo man page changes and segregation 
of the x11 based games.  I'm not going to tag the originals with bsd_44_lite
and do this in two stages since it's just not worth it for this collection,
and I've got directory renames to deal with that way.  Bleah.
Submitted by:	jkh
1994-09-04 04:03:31 +00:00

752 lines
16 KiB
C
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/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)backgammon.c 8.1 (Berkeley) 5/31/93";
#endif /* not lint */
/*
** The game of Backgammon
*/
#include <stdio.h>
#define WHITE 0
#define BROWN 1
#define NIL (-1)
#define MAXGMOV 10
#define MAXIMOVES 1000
#define RULES "/usr/games/lib/backrules"
char level; /*'b'=beginner, 'i'=intermediate, 'e'=expert*/
int die1;
int die2;
int i;
int j;
int l;
int m;
int pflg = 1;
int nobroll = 0;
int count;
int imoves;
int goodmoves[MAXGMOV];
int probmoves[MAXGMOV];
int brown[] = { /* brown position table */
0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5,
0, 0, 0, 0, 3, 0, 5, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0
};
int white[] = { /* white position table */
0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5,
0, 0, 0, 0, 3, 0, 5, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0
};
int probability[] = {
0, 11, 12, 13, 14, 15, 16,
06, 05, 04, 03, 02, 01
};
struct {
int pos[4];
int mov[4];
} moves[MAXIMOVES];
main()
{
int go[5], tvec[2];
int k, n, pid, ret, rpid, t;
char s[100];
srand(time(0));
go[5] = NIL;
fprintf(stdout, "Instructions? ");
gets(s);
if(*s == 'y')
instructions();
putchar('\n');
fprintf(stdout, "Opponent's level: b - beginner,\n");
fprintf(stdout, "i - intermediate, e - expert? ");
level='e';
gets(s);
if(*s == 'b')
level = 'b';
else if(*s == 'i')
level = 'i';
putchar('\n');
fprintf(stdout, "You will play brown.\n\n");
fprintf(stdout, "Would you like to roll your own dice? ");
gets(s);
putchar('\n');
if(*s == 'y')
nobroll = 1;
fprintf(stdout, "Would you like to go first? ");
gets(s);
putchar('\n');
if(*s == 'y')
goto nowhmove;
whitesmv:
roll(WHITE);
fprintf(stdout, "white rolls %d, %d\n", die1, die2);
fprintf(stdout, "white's move is:");
if(nextmove(white, brown) == NIL)
goto nowhmove;
if(piececount(white, 0, 24) == 0){
fprintf(stdout, "White wins");
if(piececount(brown, 0, 6) != 0)
fprintf(stdout, " with a Backgammon!\n");
else if (piececount(brown, 0, 24) == 24)
fprintf(stdout, " with a Gammon.\n");
else
fprintf(stdout, ".\n");
exit(0);
}
nowhmove:
if(pflg)
prtbrd();
roll(BROWN);
retry:
fprintf(stdout, "\nYour roll is %d %d\n", die1, die2);
fprintf(stdout, "Move? ");
gets(s);
switch(*s) {
case '\0': /* empty line */
fprintf(stdout, "Brown's move skipped.\n");
goto whitesmv;
case 'b': /* how many beared off? */
fprintf(stdout, "Brown: %d\n", piececount(brown, 0, 24) - 15);
fprintf(stdout, "White: %d\n", piececount(white, 0, 24) - 15);
goto retry;
case 'p': /* print board */
prtbrd();
goto retry;
case 's': /* stop auto printing of board */
pflg = 0;
goto retry;
case 'r': /* resume auto printing */
pflg = 1;
goto retry;
case 'm': /* print possible moves */
pmoves();
goto retry;
case 'q': /* i give up */
exit(0);
case '!': /* escape to Shell */
if(s[1] != '\0')
system(s+1);
else if((pid = fork()) == 0) {
execl("/bin/sh", "sh", "-", 0);
fprintf(stderr, "back: cannot exec /bin/sh!\n");
exit(2);
}
while((rpid = wait(&ret)) != pid && rpid != -1)
;
goto retry;
case '?': /* well, what can i do? */
fprintf(stdout, "<newline> skip this move\n");
fprintf(stdout, "b number beared off\n");
fprintf(stdout, "p print board\n");
fprintf(stdout, "q quit\n");
fprintf(stdout, "r resume auto print of board\n");
fprintf(stdout, "s stop auto print of board\n");
fprintf(stdout, "! escape to Shell\n");
goto retry;
}
n = sscanf(s,"%d%d%d%d%d",&go[0],&go[1],&go[2],&go[3],&go[4]);
if((die1 != die2 && n > 2) || n > 4){
fprintf(stdout, "Too many moves.\n");
goto retry;
}
go[n] = NIL;
if(*s=='-'){
go[0]= -go[0];
t=die1;
die1=die2;
die2=t;
}
for(k = 0; k < n; k++){
if(0 <= go[k] && go[k] <= 24)
continue;
else{
fprintf(stdout, "Move %d illegal.\n", go[k]);
goto retry;
}
}
if(play(brown, white, go))
goto retry;
if(piececount(brown, 0, 24) == 0){
fprintf(stdout, "Brown wins");
if(piececount(white, 0, 6) != 0)
fprintf(stdout, " with a Backgammon.\n");
else if(piececount(white, 0, 24) == 24)
fprintf(stdout, " with a gammon.\n");
else
fprintf(stdout, ".\n");
exit(0);
}
goto whitesmv;
}
play(player,playee,pos)
int *player,*playee,pos[];
{
int k, n, die, ipos;
for(k=0; k < player[0]; k++){ /*blots on player[0] must be moved first*/
if(pos[k] == NIL)
break;
if(pos[k] != 0){
fprintf(stdout, "Stone on bar must be moved first.\n");
return(NIL);
}
}
for(k = 0; (ipos=pos[k]) != NIL; k++){
die = k?die2:die1;
n = 25-ipos-die;
if(player[ipos] == 0)
goto badmove;
if(n > 0 && playee[n] >= 2)
goto badmove;
if(n <= 0){
if(piececount(player,0,18) != 0)
goto badmove;
if((ipos+die) != 25 && piececount(player,19,24-die)!=0)
goto badmove;
}
player[ipos]--;
player[ipos+die]++;
}
for(k = 0; pos[k] != NIL; k++){
die = k?die2:die1;
n = 25-pos[k]-die;
if(n>0 && playee[n]==1){
playee[n]=0;
playee[0]++;
}
}
return(0);
badmove:
fprintf(stdout, "Move %d illegal.\n", ipos);
while(k--){
die=k?die2:die1;
player[pos[k]]++;
player[pos[k]+die]--;
}
return(NIL);
}
nextmove(player,playee)
int *player,*playee;
{
int k;
imoves=0;
movegen(player,playee);
if(die1!=die2){
k=die1;
die1=die2;
die2=k;
movegen(player,playee);
}
if(imoves==0){
fprintf(stdout, "no move possible.\n");
return(NIL);
}
k=strategy(player,playee); /*select kth possible move*/
prtmov(k);
update(player,playee,k);
return(0);
}
prtmov(k)
int k;
{
int n;
if(k == NIL)
fprintf(stdout, "No move possible\n");
else for(n = 0; n < 4; n++){
if(moves[k].pos[n] == NIL)
break;
fprintf(stdout, " %d, %d",25-moves[k].pos[n],moves[k].mov[n]);
}
fprintf(stdout, "\n");
}
update(player,playee,k)
int *player,*playee,k;
{
int n,t;
for(n = 0; n < 4; n++){
if(moves[k].pos[n] == NIL)
break;
player[moves[k].pos[n]]--;
player[moves[k].pos[n]+moves[k].mov[n]]++;
t=25-moves[k].pos[n]-moves[k].mov[n];
if(t>0 && playee[t]==1){
playee[0]++;
playee[t]--;
}
}
}
piececount(player,startrow,endrow)
int *player,startrow,endrow;
{
int sum;
sum=0;
while(startrow <= endrow)
sum += player[startrow++];
return(sum);
}
pmoves()
{
int i1, i2;
fprintf(stdout, "Possible moves are:\n");
for(i1 = 0; i1 < imoves; i1++){
fprintf(stdout, "\n%d",i1);
for (i2 = 0; i2<4; i2++){
if(moves[i1].pos[i2] == NIL)
break;
fprintf(stdout, "%d, %d",moves[i1].pos[i2],moves[i1].mov[i2]);
}
}
fprintf(stdout, "\n");
}
roll(who)
{
register n;
char s[10];
if(who == BROWN && nobroll) {
fprintf(stdout, "Roll? ");
gets(s);
n = sscanf(s, "%d%d", &die1, &die2);
if(n != 2 || die1 < 1 || die1 > 6 || die2 < 1 || die2 > 6)
fprintf(stdout, "Illegal - I'll do it!\n");
else
return;
}
die1 = ((rand()>>8) % 6) + 1;
die2 = ((rand()>>8) % 6) + 1;
}
movegen(mover,movee)
int *mover,*movee;
{
int k;
for(i = 0; i <= 24; i++){
count = 0;
if(mover[i] == 0)
continue;
if((k=25-i-die1) > 0 && movee[k] >= 2)
if(mover[0] > 0)
break;
else
continue;
if(k <= 0){
if(piececount(mover, 0, 18) != 0)
break;
if((i+die1) != 25 && piececount(mover,19,i-1) != 0)
break;
}
mover[i]--;
mover[i+die1]++;
count = 1;
for(j = 0; j <= 24; j++){
if(mover[j]==0)
continue;
if((k=25-j-die2) > 0 && movee[k] >= 2)
if(mover[0] > 0)
break;
else
continue;
if(k <= 0){
if(piececount(mover,0,18) != 0)
break;
if((j+die2) != 25 && piececount(mover,19,j-1) != 0)
break;
}
mover[j]--;
mover[j+die2]++;
count = 2;
if(die1 != die2){
moverecord(mover);
if(mover[0] > 0)
break;
else
continue;
}
for(l = 0; l <= 24; l++){
if(mover[l] == 0)
continue;
if((k=25-l-die1) > 0 && movee[k] >= 2)
if(mover[0] > 0)
break;
else
continue;
if(k <= 0){
if(piececount(mover, 0, 18) != 0)
break;
if((l+die2) != 25 && piececount(mover,19,l-1) != 0)
break;
}
mover[l]--;
mover[l+die1]++;
count=3;
for(m=0;m<=24;m++){
if(mover[m]==0)
continue;
if((k=25-m-die1) >= 0 && movee[k] >= 2)
if(mover[0] > 0)
break;
else
continue;
if(k <= 0){
if(piececount(mover,0,18) != 0)
break;
if((m+die2) != 25 && piececount(mover,19,m-1) != 0)
break;
}
count=4;
moverecord(mover);
if(mover[0] > 0)
break;
}
if(count == 3)
moverecord(mover);
else{
mover[l]++;
mover[l+die1]--;
}
if(mover[0] > 0)
break;
}
if(count == 2)
moverecord(mover);
else{
mover[j]++;
mover[j+die1]--;
}
if(mover[0] > 0)
break;
}
if(count == 1)
moverecord(mover);
else{
mover[i]++;
mover[i+die1]--;
}
if(mover[0] > 0)
break;
}
}
moverecord(mover)
int *mover;
{
int t;
if(imoves < MAXIMOVES) {
for(t = 0; t <= 3; t++)
moves[imoves].pos[t] = NIL;
switch(count) {
case 4:
moves[imoves].pos[3]=m;
moves[imoves].mov[3]=die1;
case 3:
moves[imoves].pos[2]=l;
moves[imoves].mov[2]=die1;
case 2:
moves[imoves].pos[1]=j;
moves[imoves].mov[1]=die2;
case 1:
moves[imoves].pos[0]=i;
moves[imoves].mov[0]=die1;
imoves++;
}
}
switch(count) {
case 4:
break;
case 3:
mover[l]++;
mover[l+die1]--;
break;
case 2:
mover[j]++;
mover[j+die2]--;
break;
case 1:
mover[i]++;
mover[i+die1]--;
}
}
strategy(player,playee)
int *player,*playee;
{
int k, n, nn, bestval, moveval, prob;
n = 0;
if(imoves == 0)
return(NIL);
goodmoves[0] = NIL;
bestval = -32000;
for(k = 0; k < imoves; k++){
if((moveval=eval(player,playee,k,&prob)) < bestval)
continue;
if(moveval > bestval){
bestval = moveval;
n = 0;
}
if(n<MAXGMOV){
goodmoves[n]=k;
probmoves[n++]=prob;
}
}
if(level=='e' && n>1){
nn=n;
n=0;
prob=32000;
for(k = 0; k < nn; k++){
if((moveval=probmoves[k]) > prob)
continue;
if(moveval<prob){
prob=moveval;
n=0;
}
goodmoves[n]=goodmoves[k];
probmoves[n++]=probmoves[k];
}
}
return(goodmoves[(rand()>>4)%n]);
}
eval(player,playee,k,prob)
int *player,*playee,k,*prob;
{
int newtry[31], newother[31], *r, *q, *p, n, sum, first;
int ii, lastwhite, lastbrown;
*prob = sum = 0;
r = player+25;
p = newtry;
q = newother;
while(player<r){
*p++= *player++;
*q++= *playee++;
}
q=newtry+31;
for(p = newtry+25; p < q; p++) /* zero out spaces for hit pieces */
*p = 0;
for(n = 0; n < 4; n++){
if(moves[k].pos[n] == NIL)
break;
newtry[moves[k].pos[n]]--;
newtry[ii=moves[k].pos[n]+moves[k].mov[n]]++;
if(ii<25 && newother[25-ii]==1){
newother[25-ii]=0;
newother[0]++;
if(ii<=15 && level=='e') /* hit if near other's home */
sum++;
}
}
for(lastbrown = 0; newother[lastbrown] == 0; lastbrown++);
;
for(lastwhite = 0; newtry[lastwhite] == 0; lastwhite++)
;
lastwhite = 25-lastwhite;
if(lastwhite<=6 && lastwhite<lastbrown)
sum=1000;
/* experts running game. */
/* first priority is to */
/* get all pieces into */
/* white's home */
if(lastwhite<lastbrown && level=='e' && lastwhite>6) {
for(sum = 1000; lastwhite > 6; lastwhite--)
sum = sum-lastwhite*newtry[25-lastwhite];
}
for(first = 0; first < 25; first++)
if(newother[first] != 0) /*find other's first piece*/
break;
q = newtry+25;
for(p = newtry+1; p < q;) /* blocked points are good */
if(*p++ > 1)
sum++;
if(first > 5) { /* only stress removing pieces if */
/* homeboard cannot be hit */
q = newtry+31;
p=newtry+25;
for(n = 6; p < q; n--)
sum += *p++ * n; /*remove pieces, but just barely*/
}
if(level != 'b'){
r = newtry+25-first; /*singles past this point can't be hit*/
for(p = newtry+7; p < r; )
if(*p++ == 1) /*singles are bad after 1st 6 points if they can be hit*/
sum--;
q = newtry+3;
for(p = newtry; p < q; ) /*bad to be on 1st three points*/
sum -= *p++;
}
for(n = 1; n <= 4; n++)
*prob += n*getprob(newtry,newother,6*n-5,6*n);
return(sum);
}
instructions()
{
register fd, r;
char buf[BUFSIZ];
if((fd = open(RULES, 0)) < 0) {
fprintf(stderr, "back: cannot open %s\n", RULES);
return;
}
while(r = read(fd, buf, BUFSIZ))
write(1, buf, r);
}
getprob(player,playee,start,finish)
int *player,*playee,start,finish;
{ /*returns the probability (times 102) that any
pieces belonging to 'player' and lying between
his points 'start' and 'finish' will be hit
by a piece belonging to playee
*/
int k, n, sum;
sum = 0;
for(; start <= finish; start++){
if(player[start] == 1){
for(k = 1; k <= 12; k++){
if((n=25-start-k) < 0)
break;
if(playee[n] != 0)
sum += probability[k];
}
}
}
return(sum);
}
prtbrd()
{
int k;
static char undersc[]="______________________________________________________";
fprintf(stdout, "White's Home\n%s\r",undersc);
for(k = 1; k <= 6; k++)
fprintf(stdout, "%4d",k);
fprintf(stdout, " ");
for(k = 7; k <= 12; k++)
fprintf(stdout, "%4d",k);
putchar('\n');
numline(brown, white, 1, 6);
fprintf(stdout, " ");
numline(brown, white, 7, 12);
putchar('\n');
colorline(brown, 'B', white, 'W', 1, 6);
fprintf(stdout, " ");
colorline(brown, 'B', white, 'W', 7, 12);
putchar('\n');
if(white[0] != 0)
fprintf(stdout, "%28dW\n",white[0]);
else
putchar('\n');
if(brown[0] != 0)
fprintf(stdout, "%28dB\n", brown[0]);
else
putchar('\n');
colorline(white, 'W', brown, 'B', 1, 6);
fprintf(stdout, " ");
colorline(white, 'W', brown, 'B', 7, 12);
fprintf(stdout, "\n%s\r",undersc);
numline(white, brown, 1, 6);
fprintf(stdout, " ");
numline(white, brown, 7, 12);
putchar('\n');
for(k = 24; k >= 19; k--)
fprintf(stdout, "%4d",k);
fprintf(stdout, " ");
for(k = 18; k >= 13; k--)
fprintf(stdout, "%4d",k);
fprintf(stdout, "\nBrown's Home\n\n\n\n\n");
}
numline(upcol,downcol,start,fin)
int *upcol,*downcol,start,fin;
{
int k, n;
for(k = start; k <= fin; k++){
if((n = upcol[k]) != 0 || (n = downcol[25-k]) != 0)
fprintf(stdout, "%4d", n);
else
fprintf(stdout, " ");
}
}
colorline(upcol,c1,downcol,c2,start,fin)
int *upcol,*downcol,start,fin;
char c1,c2;
{
int k;
char c;
for(k = start; k <= fin; k++){
c = ' ';
if(upcol[k] != 0)
c = c1;
if(downcol[25-k] != 0)
c = c2;
fprintf(stdout, " %c",c);
}
}
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