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if both stdout and stderr are redirected to a non-tty, pledge(2) will kill
ncurses applications, e.g.:

/usr/games/worms 2>&1 | cat

solve this by only calling pledge(2) after initscr(3) is set and done, or
whatever function that calls it. since pledge(2) is called later now the
promises might be reduced, but this a diff for another day.

found by naddy@ almost a year ago, discussed with him deraadt@ and tb@
ok tb@

/*	$OpenBSD: crib.c,v 1.24 2021/10/23 11:22:48 mestre Exp $	*/
/*	$NetBSD: crib.c,v 1.7 1997/07/10 06:47:29 mikel Exp $	*/

/*-
 * Copyright (c) 1980, 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. 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.
 */

#include <err.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>

#include "cribbage.h"
#include "cribcur.h"

int
main(int argc, char *argv[])
{
	bool playing;
	int ch;

	while ((ch = getopt(argc, argv, "ehmqr")) != -1)
		switch (ch) {
		case 'e':
			explain = TRUE;
			break;
		case 'm':
			muggins = TRUE;
			break;
		case 'q':
			quiet = TRUE;
			break;
		case 'r':
			rflag = TRUE;
			break;
		case 'h':
		default:
			(void) fprintf(stderr, "usage: %s [-emqr]\n",
			    getprogname());
			return 1;
		}

	initscr();
	(void)signal(SIGINT, rintsig);
	cbreak();
	noecho();

	Playwin = subwin(stdscr, PLAY_Y, PLAY_X, 0, 0);
	Tablewin = subwin(stdscr, TABLE_Y, TABLE_X, 0, PLAY_X);
	Compwin = subwin(stdscr, COMP_Y, COMP_X, 0, TABLE_X + PLAY_X);
	Msgwin = subwin(stdscr, MSG_Y, MSG_X, Y_MSG_START, SCORE_X + 1);

	leaveok(Playwin, TRUE);
	leaveok(Tablewin, TRUE);
	leaveok(Compwin, TRUE);
	clearok(stdscr, FALSE);

	if (!quiet) {
		msg("Do you need instructions for cribbage? ");
		if (getuchar() == 'Y') {
			endwin();
			clear();
			mvcur(0, COLS - 1, LINES - 1, 0);
			fflush(stdout);
			instructions();
			cbreak();
			noecho();
			clear();
			refresh();
			msg("For cribbage rules, use \"man cribbage\"");
		}
	}

	if (pledge("stdio tty", NULL) == -1)
		err(1, "pledge");

	playing = TRUE;
	do {
		wclrtobot(Msgwin);
		msg(quiet ? "L or S? " : "Long (to 121) or Short (to 61)? ");
		if (glimit == SGAME)
			glimit = (getuchar() == 'L' ? LGAME : SGAME);
		else
			glimit = (getuchar() == 'S' ? SGAME : LGAME);
		game();
		msg("Another game? ");
		playing = (getuchar() == 'Y');
	} while (playing);

	bye();
	return 0;
}

/*
 * makeboard:
 *	Print out the initial board on the screen
 */
void
makeboard(void)
{
	mvaddstr(SCORE_Y + 0, SCORE_X,
	    "+---------------------------------------+");
	mvaddstr(SCORE_Y + 1, SCORE_X,
	    "|  Score:   0     YOU                   |");
	mvaddstr(SCORE_Y + 2, SCORE_X,
	    "| *.....:.....:.....:.....:.....:.....  |");
	mvaddstr(SCORE_Y + 3, SCORE_X,
	    "| *.....:.....:.....:.....:.....:.....  |");
	mvaddstr(SCORE_Y + 4, SCORE_X,
	    "|                                       |");
	mvaddstr(SCORE_Y + 5, SCORE_X,
	    "| *.....:.....:.....:.....:.....:.....  |");
	mvaddstr(SCORE_Y + 6, SCORE_X,
	    "| *.....:.....:.....:.....:.....:.....  |");
	mvaddstr(SCORE_Y + 7, SCORE_X,
	    "|  Score:   0      ME                   |");
	mvaddstr(SCORE_Y + 8, SCORE_X,
	    "+---------------------------------------+");
	gamescore();
}

/*
 * gamescore:
 *	Print out the current game score
 */
void
gamescore(void)
{
	if (pgames || cgames) {
		mvprintw(SCORE_Y + 1, SCORE_X + 28, "Games: %3d", pgames);
		mvprintw(SCORE_Y + 7, SCORE_X + 28, "Games: %3d", cgames);
	}
	Lastscore[0] = -1;
	Lastscore[1] = -1;
}

/*
 * game:
 *	Play one game up to glimit points.  Actually, we only ASK the
 *	player what card to turn.  We do a random one, anyway.
 */
void
game(void)
{
	int i, j;
	bool flag;
	bool compcrib;

	makedeck(deck);
	shuffle(deck);
	if (gamecount == 0) {
		flag = TRUE;
		do {
			if (!rflag) {			/* player cuts deck */
				char *foo;

				/* This is silly, but we should parse user input
				 * even if we're not actually going to use it.
				 */
				do {
					msg(quiet ? "Cut for crib? " :
				    "Cut to see whose crib it is -- low card wins? ");
					foo = get_line();
					if (*foo != '\0' && ((i = atoi(foo)) < 4 || i > 48))
						msg("Invalid cut");
					else
						*foo = '\0';
				} while (*foo != '\0');
			}
			i = arc4random_uniform(CARDS);	/* random cut */
			do {	/* comp cuts deck */
				j = arc4random_uniform(CARDS);
			} while (j == i);
			addmsg(quiet ? "You cut " : "You cut the ");
			msgcard(deck[i], FALSE);
			endmsg();
			addmsg(quiet ? "I cut " : "I cut the ");
			msgcard(deck[j], FALSE);
			endmsg();
			flag = (deck[i].rank == deck[j].rank);
			if (flag) {
				msg(quiet ? "We tied..." :
				    "We tied and have to try again...");
				shuffle(deck);
				continue;
			} else
				compcrib = (deck[i].rank > deck[j].rank);
		} while (flag);
		do_wait();
		clear();
		makeboard();
		refresh();
	} else {
		makeboard();
		refresh();
		werase(Tablewin);
		wrefresh(Tablewin);
		werase(Compwin);
		wrefresh(Compwin);
		msg("Loser (%s) gets first crib", (iwon ? "you" : "me"));
		compcrib = !iwon;
	}

	pscore = cscore = 0;
	flag = TRUE;
	do {
		shuffle(deck);
		flag = !playhand(compcrib);
		compcrib = !compcrib;
	} while (flag);
	++gamecount;
	if (cscore < pscore) {
		if (glimit - cscore > 60) {
			msg("YOU DOUBLE SKUNKED ME!");
			pgames += 4;
		} else
			if (glimit - cscore > 30) {
				msg("YOU SKUNKED ME!");
				pgames += 2;
			} else {
				msg("YOU WON!");
				++pgames;
			}
		iwon = FALSE;
	} else {
		if (glimit - pscore > 60) {
			msg("I DOUBLE SKUNKED YOU!");
			cgames += 4;
		} else
			if (glimit - pscore > 30) {
				msg("I SKUNKED YOU!");
				cgames += 2;
			} else {
				msg("I WON!");
				++cgames;
			}
		iwon = TRUE;
	}
	gamescore();
}

/*
 * playhand:
 *	Do up one hand of the game
 */
int
playhand(bool mycrib)
{
	int deckpos;

	werase(Compwin);
	wrefresh(Compwin);
	werase(Tablewin);
	wrefresh(Tablewin);

	knownum = 0;
	deckpos = deal(mycrib);
	sorthand(chand, FULLHAND);
	sorthand(phand, FULLHAND);
	makeknown(chand, FULLHAND);
	prhand(phand, FULLHAND, Playwin, FALSE);
	discard(mycrib);
	if (cut(mycrib, deckpos))
		return TRUE;
	if (peg(mycrib))
		return TRUE;
	werase(Tablewin);
	wrefresh(Tablewin);
	if (score(mycrib))
		return TRUE;
	return FALSE;
}

/*
 * deal cards to both players from deck
 */
int
deal(bool mycrib)
{
	int i, j;

	for (i = j = 0; i < FULLHAND; i++) {
		if (mycrib) {
			phand[i] = deck[j++];
			chand[i] = deck[j++];
		} else {
			chand[i] = deck[j++];
			phand[i] = deck[j++];
		}
	}
	return (j);
}

/*
 * discard:
 *	Handle players discarding into the crib...
 * Note: we call cdiscard() after prining first message so player doesn't wait
 */
void
discard(bool mycrib)
{
	char *prompt;
	CARD crd;

	prcrib(mycrib, TRUE);
	prompt = (quiet ? "Discard --> " : "Discard a card --> ");
	cdiscard(mycrib);	/* puts best discard at end */
	crd = phand[infrom(phand, FULLHAND, prompt)];
	cremove(crd, phand, FULLHAND);
	prhand(phand, FULLHAND, Playwin, FALSE);
	crib[0] = crd;

	/* Next four lines same as last four except for cdiscard(). */
	crd = phand[infrom(phand, FULLHAND - 1, prompt)];
	cremove(crd, phand, FULLHAND - 1);
	prhand(phand, FULLHAND, Playwin, FALSE);
	crib[1] = crd;
	crib[2] = chand[4];
	crib[3] = chand[5];
	chand[4].rank = chand[4].suit = chand[5].rank = chand[5].suit = EMPTY;
}

/*
 * cut:
 *	Cut the deck and set turnover.  Actually, we only ASK the
 *	player what card to turn.  We do a random one, anyway.
 */
int
cut(bool mycrib, int pos)
{
	int i;
	bool win;

	win = FALSE;
	if (mycrib) {
		if (!rflag) {	/* random cut */
			char *foo;

			/* This is silly, but we should parse user input,
			 * even if we're not actually going to use it.
			 */
			do {
				msg(quiet ? "Cut the deck? " :
				    "How many cards down do you wish to cut the deck? ");
				foo = get_line();
				if (*foo != '\0' && ((i = atoi(foo)) < 4 || i > 36))
					msg("Invalid cut");
				else
					*foo = '\0';
			} while (*foo != '\0');
		}
		i = arc4random_uniform(CARDS - pos);
		turnover = deck[i + pos];
		addmsg(quiet ? "You cut " : "You cut the ");
		msgcard(turnover, FALSE);
		endmsg();
		prcrib(mycrib, FALSE);
		if (turnover.rank == JACK) {
			msg("I get two for his heels");
			win = chkscr(&cscore, 2);
		}
	} else {
		i = arc4random_uniform(CARDS - pos) + pos;
		turnover = deck[i];
		addmsg(quiet ? "I cut " : "I cut the ");
		msgcard(turnover, FALSE);
		endmsg();
		prcrib(mycrib, FALSE);
		if (turnover.rank == JACK) {
			msg("You get two for his heels");
			win = chkscr(&pscore, 2);
		}
	}
	makeknown(&turnover, 1);
	return (win);
}

/*
 * prcrib:
 *	Print out the turnover card with crib indicator
 */
void
prcrib(bool mycrib, bool blank)
{
	int y, cardx;

	if (mycrib)
		cardx = CRIB_X;
	else
		cardx = 0;

	mvaddstr(CRIB_Y, cardx + 1, "CRIB");
	prcard(stdscr, CRIB_Y + 1, cardx, turnover, blank);

	if (mycrib)
		cardx = 0;
	else
		cardx = CRIB_X;

	for (y = CRIB_Y; y <= CRIB_Y + 5; y++)
		mvaddstr(y, cardx, "       ");
	refresh();
}

/*
 * peg:
 *	Handle all the pegging...
 */
static CARD Table[14];
static int Tcnt;

int
peg(bool mycrib)
{
	static CARD ch[CINHAND], ph[CINHAND];
	int i, j, k;
	int l;
	int cnum, pnum, sum;
	bool myturn, mego, ugo, last, played;
	CARD crd;

	played = FALSE;
	cnum = pnum = CINHAND;
	for (i = 0; i < CINHAND; i++) {	/* make copies of hands */
		ch[i] = chand[i];
		ph[i] = phand[i];
	}
	Tcnt = 0;		/* index to table of cards played */
	sum = 0;		/* sum of cards played */
	mego = ugo = FALSE;
	myturn = !mycrib;
	for (;;) {
		last = TRUE;	/* enable last flag */
		prhand(ph, pnum, Playwin, FALSE);
		prhand(ch, cnum, Compwin, TRUE);
		prtable(sum);
		if (myturn) {
			if (!anymove(ch, cnum, sum)) {	/* if no card to play */
				if (!mego && cnum) {	/* go for comp? */
					msg("GO");
					mego = TRUE;
				}
							/* can player move? */
				if (anymove(ph, pnum, sum))
					myturn = !myturn;
				else {			/* give him his point */
					msg(quiet ? "You get one" :
					    "You get one point");
					do_wait();
					if (chkscr(&pscore, 1))
						return TRUE;
					sum = 0;
					mego = ugo = FALSE;
					Tcnt = 0;
				}
			} else {
				played = TRUE;
				j = -1;
				k = 0;
							/* maximize score */
				for (i = 0; i < cnum; i++) {
					l = pegscore(ch[i], Table, Tcnt, sum);
					if (l > k) {
						k = l;
						j = i;
					}
				}
				if (j < 0)		/* if nothing scores */
					j = cchose(ch, cnum, sum);
				crd = ch[j];
				cremove(crd, ch, cnum--);
				sum += VAL(crd.rank);
				Table[Tcnt++] = crd;
				if (k > 0) {
					addmsg(quiet ? "I get %d playing " :
					    "I get %d points playing ", k);
					msgcard(crd, FALSE);
					endmsg();
					prhand(ph, pnum, Playwin, FALSE);
					prhand(ch, cnum, Compwin, TRUE);
					prtable(sum);
					if (chkscr(&cscore, k))
						return TRUE;
				}
				myturn = !myturn;
			}
		} else {
			if (!anymove(ph, pnum, sum)) {	/* can player move? */
				if (!ugo && pnum) {	/* go for player */
					msg("You have a GO");
					ugo = TRUE;
				}
							/* can computer play? */
				if (anymove(ch, cnum, sum))
					myturn = !myturn;
				else {
					msg(quiet ? "I get one" :
					    "I get one point");
					do_wait();
					prhand(ph, pnum, Playwin, FALSE);
					prhand(ch, cnum, Compwin, TRUE);
					prtable(sum);
					if (chkscr(&cscore, 1))
						return TRUE;
					sum = 0;
					mego = ugo = FALSE;
					Tcnt = 0;
				}
			} else {			/* player plays */
				played = FALSE;
				if (pnum == 1) {
					crd = ph[0];
					msg("You play your last card");
				} else
					for (;;) {
						prhand(ph,
						    pnum, Playwin, FALSE);
						crd = ph[infrom(ph,
						    pnum, "Your play: ")];
						if (sum + VAL(crd.rank) <= 31)
							break;
						else
					msg("Total > 31 -- try again");
					}
				makeknown(&crd, 1);
				cremove(crd, ph, pnum--);
				i = pegscore(crd, Table, Tcnt, sum);
				sum += VAL(crd.rank);
				Table[Tcnt++] = crd;
				if (i > 0) {
					msg(quiet ? "You got %d" :
					    "You got %d points", i);
					if (pnum == 0)
						do_wait();
					prhand(ph, pnum, Playwin, FALSE);
					prhand(ch, cnum, Compwin, TRUE);
					prtable(sum);
					if (chkscr(&pscore, i))
						return TRUE;
				}
				myturn = !myturn;
			}
		}
		if (sum >= 31) {
			if (!myturn)
				do_wait();
			sum = 0;
			mego = ugo = FALSE;
			Tcnt = 0;
			last = FALSE;			/* disable last flag */
		}
		if (!pnum && !cnum)
			break;				/* both done */
	}
	prhand(ph, pnum, Playwin, FALSE);
	prhand(ch, cnum, Compwin, TRUE);
	prtable(sum);
	if (last) {
		if (played) {
			msg(quiet ? "I get one for last" :
			    "I get one point for last");
			do_wait();
			if (chkscr(&cscore, 1))
				return TRUE;
		} else {
			msg(quiet ? "You get one for last" :
			    "You get one point for last");
			do_wait();
			if (chkscr(&pscore, 1))
				return TRUE;
		}
	}
	return (FALSE);
}

/*
 * prtable:
 *	Print out the table with the current score
 */
void
prtable(int score)
{
	prhand(Table, Tcnt, Tablewin, FALSE);
	mvwprintw(Tablewin, (Tcnt + 2) * 2, Tcnt + 1, "%2d", score);
	wrefresh(Tablewin);
}

/*
 * score:
 *	Handle the scoring of the hands
 */
int
score(bool mycrib)
{
	sorthand(crib, CINHAND);
	if (mycrib) {
		if (plyrhand(phand, "hand"))
			return (TRUE);
		if (comphand(chand, "hand"))
			return (TRUE);
		do_wait();
		if (comphand(crib, "crib"))
			return (TRUE);
		do_wait();
	} else {
		if (comphand(chand, "hand"))
			return (TRUE);
		if (plyrhand(phand, "hand"))
			return (TRUE);
		if (plyrhand(crib, "crib"))
			return (TRUE);
	}
	return (FALSE);
}