🚀 go-pugleaf

> #include "stdio.h"
> 
> #ifndef BUFSIZ
> #define BUFSIZ		1024
> #endif
> 
> #define RANKCOUNT	13
> 
> char	leader[] = 	"A234567891JQK";
> int	ihave[RANKCOUNT];
> int	uhave[RANKCOUNT];
> 
> char *	begins(string, beginning)
> char *	string;
> char *	beginning;
> {
> 	while (*beginning != '\0')
> 		if (*string++ != *beginning++)
> 			return 0;
> 	return string;
> }
> 
> main(argc, argv)
> int	argc;
> char *	argv[];
> {
> 	char *	cp;
> 	int	i;
> 	int	result;
> 	int	didpro;
> 	int	itoufids[2];
> 	int	utoifids[2];
> 	char	buf[BUFSIZ];
> 	char	outbuf[4];
> 
> 	if (pipe(itoufids) != 0 || pipe(utoifids) != 0)
> 		return 2;
> 	switch (fork()) {
> 		case 0:	/* child */
> 			if (close(0) == 0 && close(1) == 0 &&
> 				dup(itoufids[0]) == 0 && dup(utoifids[1]) == 1)
> 					execl("/usr/games/fish", "fish", 0);
> 		case -1:
> 			return 2;
> 	}
> 	close(utoifids[1]);
> 	didpro = 0;
> 	while ((i = getit(buf, utoifids[0], itoufids[1])) > 0) {
> 		if (argc == 1)
> 			printf("%s", buf);
> 		if (begins(buf, "instructions?")) {
> 			write(itoufids[1], "n\n", 2);
> 			if (argc == 1)
> 				printf("n\n");
> 		}
> 		if (cp = begins(buf, "your hand is: ")) {
> 			for (i = 0; i < RANKCOUNT; ++i)
> 				ihave[i] = 0;
> 			for ( ; *cp != '+' && *cp != '\0'; ++cp)
> 				for (i = 0; i < RANKCOUNT; ++i)
> 					if (*cp == leader[i])
> 						ihave[i] = 1;
> 		}
> 		if (begins(buf + 1, "ou ask me for: ")) {
> 			cp = outbuf;
> 			if (didpro == 0) {
> 				*cp++ = 'p';
> 				didpro = 1;
> 			} else if ((i = which()) >= 0) {
> 				uhave[i] = 0;
> 				if ((*cp++ = leader[i]) == '1')
> 					*cp++ = '0';
> 			}
> 			*cp++ = '\n';
> 			*cp = '\0';
> 			write(itoufids[1], outbuf, cp - outbuf);
> 			if (argc == 1)
> 				printf(outbuf);
> 		}
> 		if (cp = begins(buf, "I ask you for: "))
> 			for (i = 0; i < RANKCOUNT; ++i)
> 				if (*cp == leader[i])
> 					uhave[i] = 1;
> 		if (cp = begins(buf, "Your books: "))
> 			result = (strlen(cp) - 1) / 2;
> 	}
> 	if (i < 0)
> 		return 2;
> 	if (argc != 1)
> 		printf("%d\n", result);
> 	return result <= RANKCOUNT / 2;
> }
> 
> int	lasti;
> 
> int	which()
> {
> 	int	i;
> 
> 	for (i = 0; i < RANKCOUNT; ++i)
> 		if (ihave[i] && uhave[i])
> 			return lasti = i;
> 	for (i = 0; i < RANKCOUNT; ++i)
> 		if (ihave[lasti = (lasti + 1) % RANKCOUNT])
> 			return lasti;
> 	return -1;
> }
> 
> int	unread;
> char	mybuf[BUFSIZ + 1];
> char *	saveptr = mybuf;
> 
> #define WHATLEN	strlen("what?\n")
> 
> int	getit(buf, in, out)
> char *	buf;
> {
> 	char *	cp;
> 	int	i;
> 
> 	cp = buf;
> 	for ( ; ; ) {
> 		if (*saveptr == '\0') {
> 			unread = unread - WHATLEN;
> 			i = 0;
> 			while (unread <= BUFSIZ) {
> 				mybuf[i++] = 'n';
> 				mybuf[i++] = '\n';
> 				unread = unread + WHATLEN;
> 			}
> 			write(out, mybuf, i);
> 			i = read(in, mybuf, BUFSIZ);
> 			if (i <= 0)
> 				return i;
> 			mybuf[i] = '\0';
> 			saveptr = mybuf;
> 		}
> 		if ((*cp++ = *saveptr++) == '\n') {
> 			*cp = '\0';
> 			if (strcmp(buf, "what?\n") != 0)
> 				return cp - buf;
> 			unread = unread - WHATLEN;
> 			cp = buf;
> 			continue;
> 		}
> 		*cp = '\0';
> 		if (begins(buf + 1, "ou ask me for: "))
> 			return cp - buf;
> 	}
> }

How is this program used??
What does it do ? - Play go-fish (or does it chop, grind and liquify
					the bones?)
Hmmmmmmmmmm, That's good bass!!