/*      $OpenBSD: hack.main.c,v 1.26 2023/09/06 11:53:56 jsg 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/stat.h>
#include <errno.h>

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

#include "hack.h"

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

extern char plname[PL_NSIZ], pl_character[PL_CSIZ];
extern struct permonst mons[CMNUM+2];
extern char genocided[60], fut_geno[60];

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

int hackpid;                            /* current pid */
int locknum;                            /* max num of players */
#ifdef DEF_PAGER
char *catmore;                          /* default pager */
#endif
char SAVEF[PL_NSIZ + 11] = "save/";     /* save/99999player */
char obuf[BUFSIZ];      /* BUFSIZ is defined in stdio.h */

extern char *nomovemsg;
extern long wailmsg;

#ifdef CHDIR
static void chdirx(char *, boolean);
#endif

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

        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 $LOGNAME or $USER        (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("LOGNAME")))
                (void) strlcpy(plname, s, sizeof(plname));
          if(!*plname && (s = getenv("USER")))
                (void) strlcpy(plname, s, sizeof(plname));
          if(!*plname && (s = getlogin()))
                (void) strlcpy(plname, s, sizeof(plname));
        }

        /*
         * 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);
                return 0;
        }

        /*
         * It seems he really wants to play.
         * Remember tty modes, to be restored on exit.
         */
        gettty();
        setvbuf(stdout, obuf, _IOFBF, sizeof obuf);
        umask(007);
        startup();
        cls();
        u.uhp = 1;      /* prevent RIP on early quits */
        u.ux = FAR;     /* prevent nscr() */
        (void) signal(SIGHUP, hackhangup);

#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) strlcpy(plname, argv[0]+2, sizeof(plname));
                        } else if(argc > 1) {
                          argc--;
                          argv++;
                          (void) strlcpy(plname, argv[0], sizeof(plname));
                        } else
                                printf("Player name expected after -u\n");
                        break;
                default:
                        /* allow -T for Tourist, etc. */
                        (void) strlcpy(pl_character, argv[0]+1, sizeof(pl_character));
                        /* 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")) && !(catmore = getenv("PAGER")))
                catmore = DEF_PAGER;
#endif
#ifdef MAIL
        getmailstatus();
#endif
#ifdef WIZARD
        if(wizard) (void) strlcpy(plname, "wizard", sizeof plname); 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) strlcpy(lock,plname,sizeof lock);
                getlock();      /* sets lock if locknum != 0 */
#ifdef WIZARD
        } else {
                char *sfoo;
                (void) strlcpy(lock,plname,sizeof lock);
                if ((sfoo = getenv("MAGIC")))
                        while(*sfoo) {
                                switch(*sfoo++) {
                                case 'n': (void) srandom_deterministic(*sfoo++);
                                        break;
                                }
                        }
                if ((sfoo = getenv("GENOCIDED"))) {
                        if(*sfoo == '!'){
                                struct permonst *pm = mons;
                                char *gp = genocided;

                                while(pm < mons+CMNUM+2){
                                        if(!strchr(sfoo, pm->mlet))
                                                *gp++ = pm->mlet;
                                        pm++;
                                }
                                *gp = 0;
                        } else
                                strlcpy(genocided, sfoo, sizeof genocided);
                        strlcpy(fut_geno, genocided, sizeof fut_geno);
                }
        }
#endif
        setftty();
        (void) snprintf(SAVEF, sizeof SAVEF, "save/%u%s", getuid(), plname);
        regularize(SAVEF+5);            /* avoid . or / in name */
        if((fd = open(SAVEF, O_RDONLY)) >= 0) {
                (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)))
                          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();
                        hacktimeout();
                        ++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){
                                pline("%s", nomovemsg ? nomovemsg :
                                        "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  */
        char *tf;

        tf = lock;
        while(*tf && *tf != '.') tf++;
        (void) snprintf(tf, lock + sizeof lock - tf, ".%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 < sizeof(plname)-1) plname[ct++] = c;
        }
        plname[ct] = 0;
        if(ct == 0) askname();
}

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(char *dir, boolean wr)
{
        gid_t gid;

#ifdef SECURE
        if(dir                                  /* User specified directory? */
#ifdef HACKDIR
               && strcmp(dir, HACKDIR)          /* and not the default? */
#endif
                ) {
                /* revoke privs */
                gid = getgid();
                setresgid(gid, gid, gid);
        }
#endif

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

        if(dir && chdir(dir) == -1) {
                perror(dir);
                error("Cannot chdir to %s.", dir);
        }

        /* warn the player if he cannot write the record file */
        /* warn the player if he cannot read the permanent lock file */
        /* warn the player if he cannot create the save directory */
        /* 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 | O_CREAT, FMASK)) == -1) {
                printf("Warning: cannot write %s/%s", dir, RECORD);
                getret();
            } else
                (void) close(fd);
            if((fd = open(HLOCK, O_RDONLY | O_CREAT, FMASK)) == -1) {
                printf("Warning: cannot read %s/%s", dir, HLOCK);
                getret();
            } else
                (void) close(fd);
            if(mkdir("save", 0770) && errno != EEXIST) {
                printf("Warning: cannot create %s/save", dir);
                getret();
            }
        }
}
#endif

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