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Annotation of 43BSDTahoe/games/hack/hack.unix.c, revision 1.1

1.1     ! root        1: /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
        !             2: /* hack.unix.c - version 1.0.3 */
        !             3: 
        !             4: /* This file collects some Unix dependencies; hack.pager.c contains some more */
        !             5: 
        !             6: /*
        !             7:  * The time is used for:
        !             8:  *     - seed for random()
        !             9:  *     - year on tombstone and yymmdd in record file
        !            10:  *     - phase of the moon (various monsters react to NEW_MOON or FULL_MOON)
        !            11:  *     - night and midnight (the undead are dangerous at midnight)
        !            12:  *     - determination of what files are "very old"
        !            13:  */
        !            14: 
        !            15: #include <stdio.h>
        !            16: #include <errno.h>
        !            17: #include "hack.h"      /* mainly for index() which depends on BSD */
        !            18: 
        !            19: #include       <sys/types.h>           /* for time_t and stat */
        !            20: #include       <sys/stat.h>
        !            21: #ifdef BSD
        !            22: #include       <sys/time.h>
        !            23: #else
        !            24: #include       <time.h>
        !            25: #endif BSD
        !            26: 
        !            27: extern char *getenv();
        !            28: extern time_t time();
        !            29: 
        !            30: setrandom()
        !            31: {
        !            32:        (void) srandom((int) time ((time_t *) 0));
        !            33: }
        !            34: 
        !            35: struct tm *
        !            36: getlt()
        !            37: {
        !            38:        time_t date;
        !            39:        struct tm *localtime();
        !            40: 
        !            41:        (void) time(&date);
        !            42:        return(localtime(&date));
        !            43: }
        !            44: 
        !            45: getyear()
        !            46: {
        !            47:        return(1900 + getlt()->tm_year);
        !            48: }
        !            49: 
        !            50: char *
        !            51: getdate()
        !            52: {
        !            53:        static char datestr[7];
        !            54:        register struct tm *lt = getlt();
        !            55: 
        !            56:        (void) sprintf(datestr, "%2d%2d%2d",
        !            57:                lt->tm_year, lt->tm_mon + 1, lt->tm_mday);
        !            58:        if(datestr[2] == ' ') datestr[2] = '0';
        !            59:        if(datestr[4] == ' ') datestr[4] = '0';
        !            60:        return(datestr);
        !            61: }
        !            62: 
        !            63: phase_of_the_moon()                    /* 0-7, with 0: new, 4: full */
        !            64: {                                      /* moon period: 29.5306 days */
        !            65:                                        /* year: 365.2422 days */
        !            66:        register struct tm *lt = getlt();
        !            67:        register int epact, diy, golden;
        !            68: 
        !            69:        diy = lt->tm_yday;
        !            70:        golden = (lt->tm_year % 19) + 1;
        !            71:        epact = (11 * golden + 18) % 30;
        !            72:        if ((epact == 25 && golden > 11) || epact == 24)
        !            73:                epact++;
        !            74: 
        !            75:        return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 );
        !            76: }
        !            77: 
        !            78: night()
        !            79: {
        !            80:        register int hour = getlt()->tm_hour;
        !            81: 
        !            82:        return(hour < 6 || hour > 21);
        !            83: }
        !            84: 
        !            85: midnight()
        !            86: {
        !            87:        return(getlt()->tm_hour == 0);
        !            88: }
        !            89: 
        !            90: struct stat buf, hbuf;
        !            91: 
        !            92: gethdate(name) char *name; {
        !            93: /* old version - for people short of space */
        !            94: /*
        !            95: /* register char *np;
        !            96: /*     if(stat(name, &hbuf))
        !            97: /*             error("Cannot get status of %s.",
        !            98: /*                     (np = rindex(name, '/')) ? np+1 : name);
        !            99: /*
        !           100: /* version using PATH from: [email protected] (Greg Couch) */
        !           101: 
        !           102: 
        !           103: /*
        !           104:  * The problem with   #include <sys/param.h>   is that this include file
        !           105:  * does not exist on all systems, and moreover, that it sometimes includes
        !           106:  * <sys/types.h> again, so that the compiler sees these typedefs twice.
        !           107:  */
        !           108: #define                MAXPATHLEN      1024
        !           109: 
        !           110: register char *np, *path;
        !           111: char filename[MAXPATHLEN+1];
        !           112:        if (index(name, '/') != NULL || (path = getenv("PATH")) == NULL)
        !           113:                path = "";
        !           114: 
        !           115:        for (;;) {
        !           116:                if ((np = index(path, ':')) == NULL)
        !           117:                        np = path + strlen(path);       /* point to end str */
        !           118:                if (np - path <= 1)                     /* %% */
        !           119:                        (void) strcpy(filename, name);
        !           120:                else {
        !           121:                        (void) strncpy(filename, path, np - path);
        !           122:                        filename[np - path] = '/';
        !           123:                        (void) strcpy(filename + (np - path) + 1, name);
        !           124:                }
        !           125:                if (stat(filename, &hbuf) == 0)
        !           126:                        return;
        !           127:                if (*np == '\0')
        !           128:                        break;
        !           129:                path = np + 1;
        !           130:        }
        !           131:        error("Cannot get status of %s.",
        !           132:                (np = rindex(name, '/')) ? np+1 : name);
        !           133: }
        !           134: 
        !           135: uptodate(fd) {
        !           136:        if(fstat(fd, &buf)) {
        !           137:                pline("Cannot get status of saved level? ");
        !           138:                return(0);
        !           139:        }
        !           140:        if(buf.st_mtime < hbuf.st_mtime) {
        !           141:                pline("Saved level is out of date. ");
        !           142:                return(0);
        !           143:        }
        !           144:        return(1);
        !           145: }
        !           146: 
        !           147: /* see whether we should throw away this xlock file */
        !           148: veryold(fd) {
        !           149:        register int i;
        !           150:        time_t date;
        !           151: 
        !           152:        if(fstat(fd, &buf)) return(0);                  /* cannot get status */
        !           153:        if(buf.st_size != sizeof(int)) return(0);       /* not an xlock file */
        !           154:        (void) time(&date);
        !           155:        if(date - buf.st_mtime < 3L*24L*60L*60L) {      /* recent */
        !           156:                extern int errno;
        !           157:                int lockedpid;  /* should be the same size as hackpid */
        !           158: 
        !           159:                if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) !=
        !           160:                        sizeof(lockedpid))
        !           161:                        /* strange ... */
        !           162:                        return(0);
        !           163: 
        !           164:                /* From: Rick Adams <seismo!rick>
        !           165:                /* This will work on 4.1cbsd, 4.2bsd and system 3? & 5.
        !           166:                /* It will do nothing on V7 or 4.1bsd. */
        !           167:                if(!(kill(lockedpid, 0) == -1 && errno == ESRCH))
        !           168:                        return(0);
        !           169:        }
        !           170:        (void) close(fd);
        !           171:        for(i = 1; i <= MAXLEVEL; i++) {                /* try to remove all */
        !           172:                glo(i);
        !           173:                (void) unlink(lock);
        !           174:        }
        !           175:        glo(0);
        !           176:        if(unlink(lock)) return(0);                     /* cannot remove it */
        !           177:        return(1);                                      /* success! */
        !           178: }
        !           179: 
        !           180: getlock()
        !           181: {
        !           182:        extern int errno, hackpid, locknum;
        !           183:        register int i = 0, fd;
        !           184: 
        !           185:        (void) fflush(stdout);
        !           186: 
        !           187:        /* we ignore QUIT and INT at this point */
        !           188:        if (link(HLOCK, LLOCK) == -1) {
        !           189:                register int errnosv = errno;
        !           190: 
        !           191:                perror(HLOCK);
        !           192:                printf("Cannot link %s to %s\n", LLOCK, HLOCK);
        !           193:                switch(errnosv) {
        !           194:                case ENOENT:
        !           195:                    printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
        !           196:                    break;
        !           197:                case EACCES:
        !           198:                    printf("It seems you don't have write permission here.\n");
        !           199:                    break;
        !           200:                case EEXIST:
        !           201:                    printf("(Try again or rm %s.)\n", LLOCK);
        !           202:                    break;
        !           203:                default:
        !           204:                    printf("I don't know what is wrong.");
        !           205:                }
        !           206:                getret();
        !           207:                error("");
        !           208:                /*NOTREACHED*/
        !           209:        }
        !           210: 
        !           211:        regularize(lock);
        !           212:        glo(0);
        !           213:        if(locknum > 25) locknum = 25;
        !           214: 
        !           215:        do {
        !           216:                if(locknum) lock[0] = 'a' + i++;
        !           217: 
        !           218:                if((fd = open(lock, 0)) == -1) {
        !           219:                        if(errno == ENOENT) goto gotlock;    /* no such file */
        !           220:                        perror(lock);
        !           221:                        (void) unlink(LLOCK);
        !           222:                        error("Cannot open %s", lock);
        !           223:                }
        !           224: 
        !           225:                if(veryold(fd)) /* if true, this closes fd and unlinks lock */
        !           226:                        goto gotlock;
        !           227:                (void) close(fd);
        !           228:        } while(i < locknum);
        !           229: 
        !           230:        (void) unlink(LLOCK);
        !           231:        error(locknum ? "Too many hacks running now."
        !           232:                      : "There is a game in progress under your name.");
        !           233: gotlock:
        !           234:        fd = creat(lock, FMASK);
        !           235:        if(unlink(LLOCK) == -1)
        !           236:                error("Cannot unlink %s.", LLOCK);
        !           237:        if(fd == -1) {
        !           238:                error("cannot creat lock file.");
        !           239:        } else {
        !           240:                if(write(fd, (char *) &hackpid, sizeof(hackpid))
        !           241:                    != sizeof(hackpid)){
        !           242:                        error("cannot write lock");
        !           243:                }
        !           244:                if(close(fd) == -1) {
        !           245:                        error("cannot close lock");
        !           246:                }
        !           247:        }
        !           248: }      
        !           249: 
        !           250: #ifdef MAIL
        !           251: 
        !           252: /*
        !           253:  * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
        !           254:  * I don't know the details of his implementation.]
        !           255:  * { Later note: he disliked my calling a general mailreader and felt that
        !           256:  *   hack should do the paging itself. But when I get mail, I want to put it
        !           257:  *   in some folder, reply, etc. - it would be unreasonable to put all these
        !           258:  *   functions in hack. }
        !           259:  * The mail daemon '2' is at present not a real monster, but only a visual
        !           260:  * effect. Thus, makemon() is superfluous. This might become otherwise,
        !           261:  * however. The motion of '2' is less restrained than usual: diagonal moves
        !           262:  * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
        !           263:  * in a ROOM, even when you are Blind.
        !           264:  * Its path should be longer when you are Telepat-hic and Blind.
        !           265:  *
        !           266:  * Interesting side effects:
        !           267:  *     - You can get rich by sending yourself a lot of mail and selling
        !           268:  *       it to the shopkeeper. Unfortunately mail isn't very valuable.
        !           269:  *     - You might die in case '2' comes along at a critical moment during
        !           270:  *       a fight and delivers a scroll the weight of which causes you to
        !           271:  *       collapse.
        !           272:  *
        !           273:  * Possible extensions:
        !           274:  *     - Open the file MAIL and do fstat instead of stat for efficiency.
        !           275:  *       (But sh uses stat, so this cannot be too bad.)
        !           276:  *     - Examine the mail and produce a scroll of mail called "From somebody".
        !           277:  *     - Invoke MAILREADER in such a way that only this single letter is read.
        !           278:  *
        !           279:  *     - Make him lose his mail when a Nymph steals the letter.
        !           280:  *     - Do something to the text when the scroll is enchanted or cancelled.
        !           281:  */
        !           282: #include       "def.mkroom.h"
        !           283: static struct stat omstat,nmstat;
        !           284: static char *mailbox;
        !           285: static long laststattime;
        !           286: 
        !           287: getmailstatus() {
        !           288:        if(!(mailbox = getenv("MAIL")))
        !           289:                return;
        !           290:        if(stat(mailbox, &omstat)){
        !           291: #ifdef PERMANENT_MAILBOX
        !           292:                pline("Cannot get status of MAIL=%s .", mailbox);
        !           293:                mailbox = 0;
        !           294: #else
        !           295:                omstat.st_mtime = 0;
        !           296: #endif PERMANENT_MAILBOX
        !           297:        }
        !           298: }
        !           299: 
        !           300: ckmailstatus() {
        !           301:        if(!mailbox
        !           302: #ifdef MAILCKFREQ
        !           303:                    || moves < laststattime + MAILCKFREQ
        !           304: #endif MAILCKFREQ
        !           305:                                                        )
        !           306:                return;
        !           307:        laststattime = moves;
        !           308:        if(stat(mailbox, &nmstat)){
        !           309: #ifdef PERMANENT_MAILBOX
        !           310:                pline("Cannot get status of MAIL=%s anymore.", mailbox);
        !           311:                mailbox = 0;
        !           312: #else
        !           313:                nmstat.st_mtime = 0;
        !           314: #endif PERMANENT_MAILBOX
        !           315:        } else if(nmstat.st_mtime > omstat.st_mtime) {
        !           316:                if(nmstat.st_size)
        !           317:                        newmail();
        !           318:                getmailstatus();        /* might be too late ... */
        !           319:        }
        !           320: }
        !           321: 
        !           322: newmail() {
        !           323:        /* produce a scroll of mail */
        !           324:        register struct obj *obj;
        !           325:        register struct monst *md;
        !           326:        extern char plname[];
        !           327:        extern struct obj *mksobj(), *addinv();
        !           328:        extern struct monst *makemon();
        !           329:        extern struct permonst pm_mail_daemon;
        !           330: 
        !           331:        obj = mksobj(SCR_MAIL);
        !           332:        if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */
        !           333:                mdrush(md,0);
        !           334: 
        !           335:        pline("\"Hello, %s! I have some mail for you.\"", plname);
        !           336:        if(md) {
        !           337:                if(dist(md->mx,md->my) > 2)
        !           338:                        pline("\"Catch!\"");
        !           339:                more();
        !           340: 
        !           341:                /* let him disappear again */
        !           342:                mdrush(md,1);
        !           343:                mondead(md);
        !           344:        }
        !           345: 
        !           346:        obj = addinv(obj);
        !           347:        (void) identify(obj);           /* set known and do prinv() */
        !           348: }
        !           349: 
        !           350: /* make md run through the cave */
        !           351: mdrush(md,away)
        !           352: register struct monst *md;
        !           353: boolean away;
        !           354: {
        !           355:        register int uroom = inroom(u.ux, u.uy);
        !           356:        if(uroom >= 0) {
        !           357:                register int tmp = rooms[uroom].fdoor;
        !           358:                register int cnt = rooms[uroom].doorct;
        !           359:                register int fx = u.ux, fy = u.uy;
        !           360:                while(cnt--) {
        !           361:                        if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){
        !           362:                                fx = doors[tmp].x;
        !           363:                                fy = doors[tmp].y;
        !           364:                        }
        !           365:                        tmp++;
        !           366:                }
        !           367:                tmp_at(-1, md->data->mlet);     /* open call */
        !           368:                if(away) {      /* interchange origin and destination */
        !           369:                        unpmon(md);
        !           370:                        tmp = fx; fx = md->mx; md->mx = tmp;
        !           371:                        tmp = fy; fy = md->my; md->my = tmp;
        !           372:                }
        !           373:                while(fx != md->mx || fy != md->my) {
        !           374:                        register int dx,dy,nfx = fx,nfy = fy,d1,d2;
        !           375: 
        !           376:                        tmp_at(fx,fy);
        !           377:                        d1 = DIST(fx,fy,md->mx,md->my);
        !           378:                        for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++)
        !           379:                            if(dx || dy) {
        !           380:                                d2 = DIST(fx+dx,fy+dy,md->mx,md->my);
        !           381:                                if(d2 < d1) {
        !           382:                                    d1 = d2;
        !           383:                                    nfx = fx+dx;
        !           384:                                    nfy = fy+dy;
        !           385:                                }
        !           386:                            }
        !           387:                        if(nfx != fx || nfy != fy) {
        !           388:                            fx = nfx;
        !           389:                            fy = nfy;
        !           390:                        } else {
        !           391:                            if(!away) {
        !           392:                                md->mx = fx;
        !           393:                                md->my = fy;
        !           394:                            }
        !           395:                            break;
        !           396:                        } 
        !           397:                }
        !           398:                tmp_at(-1,-1);                  /* close call */
        !           399:        }
        !           400:        if(!away)
        !           401:                pmon(md);
        !           402: }
        !           403: 
        !           404: readmail() {
        !           405: #ifdef DEF_MAILREADER                  /* This implies that UNIX is defined */
        !           406:        register char *mr = 0;
        !           407:        more();
        !           408:        if(!(mr = getenv("MAILREADER")))
        !           409:                mr = DEF_MAILREADER;
        !           410:        if(child(1)){
        !           411:                execl(mr, mr, (char *) 0);
        !           412:                exit(1);
        !           413:        }
        !           414: #else DEF_MAILREADER
        !           415:        (void) page_file(mailbox, FALSE);
        !           416: #endif DEF_MAILREADER
        !           417:        /* get new stat; not entirely correct: there is a small time
        !           418:           window where we do not see new mail */
        !           419:        getmailstatus();
        !           420: }
        !           421: #endif MAIL
        !           422: 
        !           423: regularize(s)  /* normalize file name - we don't like ..'s or /'s */
        !           424: register char *s;
        !           425: {
        !           426:        register char *lp;
        !           427: 
        !           428:        while((lp = index(s, '.')) || (lp = index(s, '/')))
        !           429:                *lp = '_';
        !           430: }

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