/*      $OpenBSD: hack.lev.c,v 1.10 2016/01/09 18:33:15 mestre 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 <stdlib.h>
#include <unistd.h>

#include "hack.h"

extern struct obj *billobjs;
extern char SAVEF[];
extern int hackpid;
extern xchar dlevel;
extern char nul[];

#ifndef NOWORM
extern struct wseg *wsegs[32], *wheads[32];
extern long wgrowtime[32];
#endif /* NOWORM */

boolean level_exists[MAXLEVEL+1];

void
savelev(int fd, xchar lev)
{
#ifndef NOWORM
        struct wseg *wtmp, *wtmp2;
        int tmp;
#endif /* NOWORM */

        if (fd < 0)
                panic("Save on bad file!");     /* impossible */
        if (lev >= 0 && lev <= MAXLEVEL)
                level_exists[(int)lev] = TRUE;

        bwrite(fd, &hackpid,sizeof(hackpid));
        bwrite(fd, &lev,sizeof(lev));
        bwrite(fd, levl,sizeof(levl));
        bwrite(fd, &moves,sizeof(long));
        bwrite(fd, &xupstair,sizeof(xupstair));
        bwrite(fd, &yupstair,sizeof(yupstair));
        bwrite(fd, &xdnstair,sizeof(xdnstair));
        bwrite(fd, &ydnstair,sizeof(ydnstair));
        savemonchn(fd, fmon);
        savegoldchn(fd, fgold);
        savetrapchn(fd, ftrap);
        saveobjchn(fd, fobj);
        saveobjchn(fd, billobjs);
        billobjs = 0;
        save_engravings(fd);
#ifndef QUEST
        bwrite(fd, rooms,sizeof(rooms));
        bwrite(fd, doors,sizeof(doors));
#endif /* QUEST */
        fgold = 0;
        ftrap = 0;
        fmon = 0;
        fobj = 0;
#ifndef NOWORM
        bwrite(fd, wsegs,sizeof(wsegs));
        for(tmp=1; tmp<32; tmp++){
                for(wtmp = wsegs[tmp]; wtmp; wtmp = wtmp2){
                        wtmp2 = wtmp->nseg;
                        bwrite(fd, wtmp,sizeof(struct wseg));
                }
                wsegs[tmp] = 0;
        }
        bwrite(fd, wgrowtime,sizeof(wgrowtime));
#endif /* NOWORM */
}

void
bwrite(int fd, const void *loc, ssize_t num)
{
        if(write(fd, loc, num) != num)
                panic("cannot write %zd bytes to file #%d", num, fd);
}

void
saveobjchn(int fd, struct obj *otmp)
{
        struct obj *otmp2;
        unsigned xl;
        int minusone = -1;

        while(otmp) {
                otmp2 = otmp->nobj;
                xl = otmp->onamelth;
                bwrite(fd, &xl, sizeof(int));
                bwrite(fd, otmp, xl + sizeof(struct obj));
                free(otmp);
                otmp = otmp2;
        }
        bwrite(fd, &minusone, sizeof(int));
}

void
savemonchn(int fd, struct monst *mtmp)
{
        struct monst *mtmp2;
        unsigned xl;
        int minusone = -1;
        struct permonst *monbegin = &mons[0];

        bwrite(fd, &monbegin, sizeof(monbegin));

        while(mtmp) {
                mtmp2 = mtmp->nmon;
                xl = mtmp->mxlth + mtmp->mnamelth;
                bwrite(fd, &xl, sizeof(int));
                bwrite(fd, mtmp, xl + sizeof(struct monst));
                if(mtmp->minvent) saveobjchn(fd,mtmp->minvent);
                free(mtmp);
                mtmp = mtmp2;
        }
        bwrite(fd, &minusone, sizeof(int));
}

void
savegoldchn(int fd, struct gold *gold)
{
        struct gold *gold2;
        while(gold) {
                gold2 = gold->ngold;
                bwrite(fd, gold, sizeof(struct gold));
                free(gold);
                gold = gold2;
        }
        bwrite(fd, nul, sizeof(struct gold));
}

void
savetrapchn(int fd, struct trap *trap)
{
        struct trap *trap2;
        while(trap) {
                trap2 = trap->ntrap;
                bwrite(fd, trap, sizeof(struct trap));
                free(trap);
                trap = trap2;
        }
        bwrite(fd, nul, sizeof(struct trap));
}

void
getlev(int fd, int pid, xchar lev)
{
        struct gold *gold;
        struct trap *trap;
#ifndef NOWORM
        struct wseg *wtmp;
#endif /* NOWORM */
        int tmp;
        long omoves;
        int hpid;
        xchar dlvl;

        /* First some sanity checks */
        mread(fd, (char *) &hpid, sizeof(hpid));
        mread(fd, (char *) &dlvl, sizeof(dlvl));
        if((pid && pid != hpid) || (lev && dlvl != lev)) {
                pline("Strange, this map is not as I remember it.");
                pline("Somebody is trying some trickery here ...");
                pline("This game is void ...");
                done("tricked");
        }

        fgold = 0;
        ftrap = 0;
        mread(fd, (char *) levl, sizeof(levl));
        mread(fd, (char *)&omoves, sizeof(omoves));
        mread(fd, (char *)&xupstair, sizeof(xupstair));
        mread(fd, (char *)&yupstair, sizeof(yupstair));
        mread(fd, (char *)&xdnstair, sizeof(xdnstair));
        mread(fd, (char *)&ydnstair, sizeof(ydnstair));

        fmon = restmonchn(fd);

        /* regenerate animals while on another level */
        { long tmoves = (moves > omoves) ? moves-omoves : 0;
          struct monst *mtmp, *mtmp2;
          extern char genocided[];

          for(mtmp = fmon; mtmp; mtmp = mtmp2) {
                long newhp;             /* tmoves may be very large */

                mtmp2 = mtmp->nmon;
                if(strchr(genocided, mtmp->data->mlet)) {
                        mondead(mtmp);
                        continue;
                }

                if(mtmp->mtame && tmoves > 250) {
                        mtmp->mtame = 0;
                        mtmp->mpeaceful = 0;
                }

                newhp = mtmp->mhp +
                        (strchr(MREGEN, mtmp->data->mlet) ? tmoves : tmoves/20);
                if(newhp > mtmp->mhpmax)
                        mtmp->mhp = mtmp->mhpmax;
                else
                        mtmp->mhp = newhp;
          }
        }

        setgd();
        gold = newgold();
        mread(fd, (char *)gold, sizeof(struct gold));
        while(gold->gx) {
                gold->ngold = fgold;
                fgold = gold;
                gold = newgold();
                mread(fd, (char *)gold, sizeof(struct gold));
        }
        free(gold);
        trap = newtrap();
        mread(fd, (char *)trap, sizeof(struct trap));
        while(trap->tx) {
                trap->ntrap = ftrap;
                ftrap = trap;
                trap = newtrap();
                mread(fd, (char *)trap, sizeof(struct trap));
        }
        free(trap);
        fobj = restobjchn(fd);
        billobjs = restobjchn(fd);
        rest_engravings(fd);
#ifndef QUEST
        mread(fd, (char *)rooms, sizeof(rooms));
        mread(fd, (char *)doors, sizeof(doors));
#endif /* QUEST */
#ifndef NOWORM
        mread(fd, (char *)wsegs, sizeof(wsegs));
        for(tmp = 1; tmp < 32; tmp++) if(wsegs[tmp]){
                wheads[tmp] = wsegs[tmp] = wtmp = newseg();
                while(1) {
                        mread(fd, (char *)wtmp, sizeof(struct wseg));
                        if(!wtmp->nseg) break;
                        wheads[tmp]->nseg = wtmp = newseg();
                        wheads[tmp] = wtmp;
                }
        }
        mread(fd, (char *)wgrowtime, sizeof(wgrowtime));
#endif /* NOWORM */
}

void
mread(int fd, char *buf, unsigned len)
{
        int rlen;
        extern boolean restoring;

        rlen = read(fd, buf, (int) len);
        if(rlen != len){
                pline("Read %d instead of %u bytes.\n", rlen, len);
                if(restoring) {
                        (void) unlink(SAVEF);
                        error("Error restoring old game.");
                }
                panic("Error reading level file.");
        }
}

void
mklev(void)
{
        extern boolean in_mklev;

        if(getbones()) return;

        in_mklev = TRUE;
        makelevel();
        in_mklev = FALSE;
}