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Fix up still more casts; use NULL instead of (char *)0.

/*	$NetBSD: hack.main.c,v 1.17 2011/08/06 20:42:43 dholland Exp $	*/

/*
 * Copyright (c) 1985, Stichting Centrum voor Wiskunde en Informatica,
 * Amsterdam
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * - 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.
 *
 * - Neither the name of the Stichting Centrum voor Wiskunde en
 * Informatica, 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
 * 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.
 */

/*
 * Copyright (c) 1982 Jay Fenlason <hack@gnu.org>
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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 <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: hack.main.c,v 1.17 2011/08/06 20:42:43 dholland Exp $");
#endif				/* not lint */

#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include "hack.h"
#include "extern.h"

#ifdef QUEST
#define	gamename	"quest"
#else
#define	gamename	"hack"
#endif

int             (*afternmv)(void);
int             (*occupation)(void);
const char           *occtxt;		/* defined when occupation != NULL */

int             hackpid;	/* current pid */
int             locknum;	/* max num of players */
#ifdef DEF_PAGER
const char     *catmore;	/* default pager */
#endif
char            SAVEF[PL_NSIZ + 11] = "save/";	/* save/99999player */
char           *hname;		/* name of the game (argv[0] of call) */

static char obuf[BUFSIZ];	/* BUFSIZ is defined in stdio.h */

int main(int, char *[]);
static void chdirx(const char *, boolean);

int
main(int argc, char *argv[])
{
	int             fd;
#ifdef CHDIR
	char           *dir;
#endif

	/* Check for dirty tricks with closed fds 0, 1, 2 */
	fd = open("/dev/null", O_RDONLY);
	if (fd < 3)
		exit(1);
	close(fd);

	hname = argv[0];
	hackpid = getpid();

#ifdef CHDIR			/* otherwise no chdir() */
	/*
	 * See if we must change directory to the playground.
	 * (Perhaps hack runs suid and playground is inaccessible
	 *  for the player.)
	 * The environment variable HACKDIR is overridden by a
	 *  -d command line option (must be the first option given)
	 */

	dir = getenv("HACKDIR");
	if (argc > 1 && !strncmp(argv[1], "-d", 2)) {
		argc--;
		argv++;
		dir = argv[0] + 2;
		if (*dir == '=' || *dir == ':')
			dir++;
		if (!*dir && argc > 1) {
			argc--;
			argv++;
			dir = argv[0];
		}
		if (!*dir)
			error("Flag -d must be followed by a directory name.");
	}
#endif

	/*
	 * Who am i? Algorithm: 1. Use name as specified in HACKOPTIONS
	 *			2. Use $USER or $LOGNAME	(if 1. fails)
	 *			3. Use getlogin()		(if 2. fails)
	 * The resulting name is overridden by command line options.
	 * If everything fails, or if the resulting name is some generic
	 * account like "games", "play", "player", "hack" then eventually
	 * we'll ask him.
	 * Note that we trust him here; it is possible to play under
	 * somebody else's name.
	 */
	{
		char           *s;

		initoptions();
		if (!*plname && (s = getenv("USER")))
			(void) strncpy(plname, s, sizeof(plname) - 1);
		if (!*plname && (s = getenv("LOGNAME")))
			(void) strncpy(plname, s, sizeof(plname) - 1);
		if (!*plname && (s = getlogin()))
			(void) strncpy(plname, s, sizeof(plname) - 1);
	}

	/*
	 * Now we know the directory containing 'record' and
	 * may do a prscore().
	 */
	if (argc > 1 && !strncmp(argv[1], "-s", 2)) {
#ifdef CHDIR
		chdirx(dir, 0);
#endif
		prscore(argc, argv);
		exit(0);
	}
	/*
	 * It seems he really wants to play.
	 * Remember tty modes, to be restored on exit.
	 */
	gettty();
	setbuf(stdout, obuf);
	setrandom();
	startup();
	cls();
	u.uhp = 1;		/* prevent RIP on early quits */
	u.ux = FAR;		/* prevent nscr() */
	(void) signal(SIGHUP, hang_up);

	/*
	 * Find the creation date of this game,
	 * so as to avoid restoring outdated savefiles.
	 */
	gethdate(hname);

	/*
	 * We cannot do chdir earlier, otherwise gethdate will fail.
	 */
#ifdef CHDIR
	chdirx(dir, 1);
#endif

	/*
	 * Process options.
	 */
	while (argc > 1 && argv[1][0] == '-') {
		argv++;
		argc--;
		switch (argv[0][1]) {
#ifdef WIZARD
		case 'D':
			/* if(!strcmp(getlogin(), WIZARD)) */
			wizard = TRUE;
			/*
			 * else printf("Sorry.\n");
			 */
			break;
#endif
#ifdef NEWS
		case 'n':
			flags.nonews = TRUE;
			break;
#endif
		case 'u':
			if (argv[0][2])
				(void) strncpy(plname, argv[0] + 2, sizeof(plname) - 1);
			else if (argc > 1) {
				argc--;
				argv++;
				(void) strncpy(plname, argv[0], sizeof(plname) - 1);
			} else
				printf("Player name expected after -u\n");
			break;
		default:
			/* allow -T for Tourist, etc. */
			(void) strncpy(pl_character, argv[0] + 1,
				       sizeof(pl_character) - 1);

			/* printf("Unknown option: %s\n", *argv); */
		}
	}

	if (argc > 1)
		locknum = atoi(argv[1]);
#ifdef MAX_NR_OF_PLAYERS
	if (!locknum || locknum > MAX_NR_OF_PLAYERS)
		locknum = MAX_NR_OF_PLAYERS;
#endif
#ifdef DEF_PAGER
	if (((catmore = getenv("HACKPAGER")) == NULL &&
	    (catmore = getenv("PAGER")) == NULL) ||
	    catmore[0] == '\0')
		catmore = DEF_PAGER;
#endif
#ifdef MAIL
	getmailstatus();
#endif
#ifdef WIZARD
	if (wizard)
		(void) strcpy(plname, "wizard");
	else
#endif
		if (!*plname || !strncmp(plname, "player", 4)
		    || !strncmp(plname, "games", 4))
		askname();
	plnamesuffix();		/* strip suffix from name; calls askname() */
	/* again if suffix was whole name */
	/* accepts any suffix */
#ifdef WIZARD
	if (!wizard) {
#endif
		/*
		 * check for multiple games under the same name
		 * (if !locknum) or check max nr of players (otherwise)
		 */
		(void) signal(SIGQUIT, SIG_IGN);
		(void) signal(SIGINT, SIG_IGN);
		if (!locknum)
			(void) strcpy(lock, plname);
		getlock();	/* sets lock if locknum != 0 */
#ifdef WIZARD
	} else {
		char           *sfoo;
		(void) strcpy(lock, plname);
		if ((sfoo = getenv("MAGIC")) != NULL)
			while (*sfoo) {
				switch (*sfoo++) {
				case 'n':
					(void) srandom(*sfoo++);
					break;
				}
			}
		if ((sfoo = getenv("GENOCIDED")) != NULL) {
			if (*sfoo == '!') {
				const struct permonst *pm = mons;
				char           *gp = genocided;

				while (pm < mons + CMNUM + 2) {
					if (!strchr(sfoo, pm->mlet))
						*gp++ = pm->mlet;
					pm++;
				}
				*gp = 0;
			} else
				(void) strlcpy(genocided, sfoo,
						sizeof(genocided));
			(void) strcpy(fut_geno, genocided);
		}
	}
#endif
	setftty();
	(void) snprintf(SAVEF, sizeof(SAVEF), "save/%d%s", getuid(), plname);
	regularize(SAVEF + 5);	/* avoid . or / in name */
	if ((fd = open(SAVEF, O_RDONLY)) >= 0 &&
	    (uptodate(fd) || unlink(SAVEF) == 666)) {
		(void) signal(SIGINT, done1);
		pline("Restoring old save file...");
		(void) fflush(stdout);
		if (!dorecover(fd))
			goto not_recovered;
		pline("Hello %s, welcome to %s!", plname, gamename);
		flags.move = 0;
	} else {
not_recovered:
		fobj = fcobj = invent = 0;
		fmon = fallen_down = 0;
		ftrap = 0;
		fgold = 0;
		flags.ident = 1;
		init_objects();
		u_init();

		(void) signal(SIGINT, done1);
		mklev();
		u.ux = xupstair;
		u.uy = yupstair;
		(void) inshop();
		setsee();
		flags.botlx = 1;
		makedog();
		{
			struct monst   *mtmp;
			if ((mtmp = m_at(u.ux, u.uy)) != NULL)
				mnexto(mtmp);	/* riv05!a3 */
		}
		seemons();
#ifdef NEWS
		if (flags.nonews || !readnews())
			/* after reading news we did docrt() already */
#endif
			docrt();

		/* give welcome message before pickup messages */
		pline("Hello %s, welcome to %s!", plname, gamename);

		pickup(1);
		read_engr_at(u.ux, u.uy);
		flags.move = 1;
	}

	flags.moonphase = phase_of_the_moon();
	if (flags.moonphase == FULL_MOON) {
		pline("You are lucky! Full moon tonight.");
		u.uluck++;
	} else if (flags.moonphase == NEW_MOON) {
		pline("Be careful! New moon tonight.");
	}
	initrack();

	for (;;) {
		if (flags.move) {	/* actual time passed */

			settrack();

			if (moves % 2 == 0 ||
			    (!(Fast & ~INTRINSIC) && (!Fast || rn2(3)))) {
				movemon();
				if (!rn2(70))
					(void) makemon((struct permonst *) 0, 0, 0);
			}
			if (Glib)
				glibr();
			timeout();
			++moves;
			if (flags.time)
				flags.botl = 1;
			if (u.uhp < 1) {
				pline("You die...");
				done("died");
			}
			if (u.uhp * 10 < u.uhpmax && moves - wailmsg > 50) {
				wailmsg = moves;
				if (u.uhp == 1)
					pline("You hear the wailing of the Banshee...");
				else
					pline("You hear the howling of the CwnAnnwn...");
			}
			if (u.uhp < u.uhpmax) {
				if (u.ulevel > 9) {
					if (Regeneration || !(moves % 3)) {
						flags.botl = 1;
						u.uhp += rnd((int) u.ulevel - 9);
						if (u.uhp > u.uhpmax)
							u.uhp = u.uhpmax;
					}
				} else if (Regeneration ||
					 (!(moves % (22 - u.ulevel * 2)))) {
					flags.botl = 1;
					u.uhp++;
				}
			}
			if (Teleportation && !rn2(85))
				tele();
			if (Searching && multi >= 0)
				(void) dosearch();
			gethungry();
			invault();
			amulet();
		}
		if (multi < 0) {
			if (!++multi) {
				if (nomovemsg)
					pline("%s", nomovemsg);
				else
					pline("You can move again.");
				nomovemsg = 0;
				if (afternmv)
					(*afternmv) ();
				afternmv = 0;
			}
		}
		find_ac();
#ifndef QUEST
		if (!flags.mv || Blind)
#endif
		{
			seeobjs();
			seemons();
			nscr();
		}
		if (flags.botl || flags.botlx)
			bot();

		flags.move = 1;

		if (multi >= 0 && occupation) {
			if (monster_nearby())
				stop_occupation();
			else if ((*occupation) () == 0)
				occupation = 0;
			continue;
		}
		if (multi > 0) {
#ifdef QUEST
			if (flags.run >= 4)
				finddir();
#endif
			lookaround();
			if (!multi) {	/* lookaround may clear multi */
				flags.move = 0;
				continue;
			}
			if (flags.mv) {
				if (multi < COLNO && !--multi)
					flags.mv = flags.run = 0;
				domove();
			} else {
				--multi;
				rhack(save_cm);
			}
		} else if (multi == 0) {
#ifdef MAIL
			ckmailstatus();
#endif
			rhack(NULL);
		}
		if (multi && multi % 7 == 0)
			(void) fflush(stdout);
	}
}

void
glo(int foo)
{
	/* construct the string  xlock.n  */
	size_t pos;

	pos = 0;
	while (lock[pos] && lock[pos] != '.')
		pos++;
	(void) snprintf(lock + pos, sizeof(lock) - pos, ".%d", foo);
}

/*
 * plname is filled either by an option (-u Player  or  -uPlayer) or
 * explicitly (-w implies wizard) or by askname.
 * It may still contain a suffix denoting pl_character.
 */
void
askname(void)
{
	int             c, ct;
	printf("\nWho are you? ");
	(void) fflush(stdout);
	ct = 0;
	while ((c = getchar()) != '\n') {
		if (c == EOF)
			error("End of input\n");
		/* some people get confused when their erase char is not ^H */
		if (c == '\010') {
			if (ct)
				ct--;
			continue;
		}
		if (c != '-')
			if (c < 'A' || (c > 'Z' && c < 'a') || c > 'z')
				c = '_';
		if (ct < (int)sizeof(plname) - 1)
			plname[ct++] = c;
	}
	plname[ct] = 0;
	if (ct == 0)
		askname();
}

/* VARARGS1 */
void
impossible(const char *s, ...)
{
	va_list ap;

	va_start(ap, s);
	vpline(s, ap);
	va_end(ap);
	pline("Program in disorder - perhaps you'd better Quit.");
}

#ifdef CHDIR
static void
chdirx(const char *dir, boolean wr)
{

#ifdef SECURE
	if (dir			/* User specified directory? */
#ifdef HACKDIR
	    && strcmp(dir, HACKDIR)	/* and not the default? */
#endif
		) {
		(void) setuid(getuid());	/* Ron Wessels */
		(void) setgid(getgid());
	}
#endif

#ifdef HACKDIR
	if (dir == NULL)
		dir = HACKDIR;
#endif

	if (dir && chdir(dir) < 0) {
		perror(dir);
		error("Cannot chdir to %s.", dir);
	}
	/* warn the player if he cannot write the record file */
	/* perhaps we should also test whether . is writable */
	/* unfortunately the access systemcall is worthless */
	if (wr) {
		int fd;

		if (dir == NULL)
			dir = ".";
		if ((fd = open(RECORD, O_RDWR)) < 0) {
			printf("Warning: cannot write %s/%s", dir, RECORD);
			getret();
		} else
			(void) close(fd);
	}
}
#endif

void
stop_occupation(void)
{
	if (occupation) {
		pline("You stop %s.", occtxt);
		occupation = 0;
	}
}