/* $OpenBSD: hack.unix.c,v 1.23 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. */ /* This file collects some Unix dependencies; hack.pager.c contains some more */ /* * The time is used for: * - seed for random() * - year on tombstone and yymmdd in record file * - phase of the moon (various monsters react to NEW_MOON or FULL_MOON) * - night and midnight (the undead are dangerous at midnight) * - determination of what files are "very old" */ #include <sys/stat.h> #include <err.h> #include <errno.h> #include <limits.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <time.h> #include <unistd.h> #include "hack.h" static struct tm *getlt(void); static int veryold(int); #ifdef MAIL static void newmail(void); static void mdrush(struct monst *, boolean); #endif static struct tm * getlt(void) { time_t date; (void) time(&date); return(localtime(&date)); } int getyear(void) { return(1900 + getlt()->tm_year); } char * getdate(void) { static char datestr[7]; struct tm *lt = getlt(); (void) snprintf(datestr, sizeof(datestr), "%02d%02d%02d", lt->tm_year % 100, lt->tm_mon + 1, lt->tm_mday); return(datestr); } /* * 0-7, with 0: new, 4: full * moon period: 29.5306 days * year: 365.2422 days */ int phase_of_the_moon(void) { struct tm *lt = getlt(); int epact, diy, golden; diy = lt->tm_yday; golden = (lt->tm_year % 19) + 1; epact = (11 * golden + 18) % 30; if ((epact == 25 && golden > 11) || epact == 24) epact++; return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 ); } int night(void) { int hour = getlt()->tm_hour; return(hour < 6 || hour > 21); } int midnight(void) { return(getlt()->tm_hour == 0); } struct stat buf; /* see whether we should throw away this xlock file */ static int veryold(int fd) { int i; time_t date; if(fstat(fd, &buf)) return(0); /* cannot get status */ if(buf.st_size != sizeof(int)) return(0); /* not an xlock file */ (void) time(&date); if(date - buf.st_mtime < 3L*24L*60L*60L) { /* recent */ int lockedpid; /* should be the same size as hackpid */ if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) != sizeof(lockedpid)) /* strange ... */ return(0); /* From: Rick Adams <seismo!rick> This will work on 4.1cbsd, 4.2bsd and system 3? & 5. It will do nothing on V7 or 4.1bsd. */ if(!(kill(lockedpid, 0) == -1 && errno == ESRCH)) return(0); } (void) close(fd); for(i = 1; i <= MAXLEVEL; i++) { /* try to remove all */ glo(i); (void) unlink(lock); } glo(0); if(unlink(lock)) return(0); /* cannot remove it */ return(1); /* success! */ } void getlock(void) { extern int hackpid, locknum; int i = 0, fd; (void) fflush(stdout); /* we ignore QUIT and INT at this point */ if (link(HLOCK, LLOCK) == -1) { int errnosv = errno; perror(HLOCK); printf("Cannot link %s to %s\n", LLOCK, HLOCK); switch(errnosv) { case ENOENT: printf("Perhaps there is no (empty) file %s ?\n", HLOCK); break; case EACCES: printf("It seems you don't have write permission here.\n"); break; case EEXIST: printf("(Try again or rm %s.)\n", LLOCK); break; default: printf("I don't know what is wrong."); } getret(); error(""); } regularize(lock); glo(0); if(locknum > 25) locknum = 25; do { if(locknum) lock[0] = 'a' + i++; if((fd = open(lock, O_RDONLY)) == -1) { if(errno == ENOENT) goto gotlock; /* no such file */ perror(lock); (void) unlink(LLOCK); error("Cannot open %s", lock); } if(veryold(fd)) /* if true, this closes fd and unlinks lock */ goto gotlock; (void) close(fd); } while(i < locknum); (void) unlink(LLOCK); error(locknum ? "Too many hacks running now." : "There is a game in progress under your name."); gotlock: fd = open(lock, O_CREAT | O_TRUNC | O_WRONLY, FMASK); if(unlink(LLOCK) == -1) error("Cannot unlink %s.", LLOCK); if(fd == -1) { error("cannot creat lock file."); } else { if(write(fd, (char *) &hackpid, sizeof(hackpid)) != sizeof(hackpid)){ error("cannot write lock"); } if(close(fd) == -1) { error("cannot close lock"); } } } #ifdef MAIL /* * Notify user when new mail has arrived. [Idea from Merlyn Leroy, but * I don't know the details of his implementation.] * { Later note: he disliked my calling a general mailreader and felt that * hack should do the paging itself. But when I get mail, I want to put it * in some folder, reply, etc. - it would be unreasonable to put all these * functions in hack. } * The mail daemon '2' is at present not a real monster, but only a visual * effect. Thus, makemon() is superfluous. This might become otherwise, * however. The motion of '2' is less restrained than usual: diagonal moves * from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible * in a ROOM, even when you are Blind. * Its path should be longer when you are Telepat-hic and Blind. * * Interesting side effects: * - You can get rich by sending yourself a lot of mail and selling * it to the shopkeeper. Unfortunately mail isn't very valuable. * - You might die in case '2' comes along at a critical moment during * a fight and delivers a scroll the weight of which causes you to * collapse. * * Possible extensions: * - Open the file MAIL and do fstat instead of stat for efficiency. * (But sh uses stat, so this cannot be too bad.) * - Examine the mail and produce a scroll of mail called "From somebody". * - Invoke MAILREADER in such a way that only this single letter is read. * * - Make him lose his mail when a Nymph steals the letter. * - Do something to the text when the scroll is enchanted or cancelled. */ static struct stat omstat,nmstat; static char *mailbox; static long laststattime; void getmailstatus(void) { if(!(mailbox = getenv("MAIL"))) return; if(stat(mailbox, &omstat)){ #ifdef PERMANENT_MAILBOX pline("Cannot get status of MAIL=%s .", mailbox); mailbox = 0; #else omstat.st_mtime = 0; #endif /* PERMANENT_MAILBOX */ } } void ckmailstatus(void) { if(!mailbox #ifdef MAILCKFREQ || moves < laststattime + MAILCKFREQ #endif /* MAILCKFREQ */ ) return; laststattime = moves; if(stat(mailbox, &nmstat)){ #ifdef PERMANENT_MAILBOX pline("Cannot get status of MAIL=%s anymore.", mailbox); mailbox = 0; #else nmstat.st_mtime = 0; #endif /* PERMANENT_MAILBOX */ } else if(nmstat.st_mtime > omstat.st_mtime) { if(nmstat.st_size) newmail(); getmailstatus(); /* might be too late ... */ } } static void newmail(void) { /* produce a scroll of mail */ struct obj *obj; struct monst *md; extern char plname[]; extern struct obj *mksobj(); extern struct monst *makemon(); extern struct permonst pm_mail_daemon; obj = mksobj(SCR_MAIL); if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */ mdrush(md,0); pline("\"Hello, %s! I have some mail for you.\"", plname); if(md) { if(dist(md->mx,md->my) > 2) pline("\"Catch!\""); more(); /* let him disappear again */ mdrush(md,1); mondead(md); } obj = addinv(obj); (void) identify(obj); /* set known and do prinv() */ } /* make md run through the cave */ static void mdrush(struct monst *md, boolean away) { int uroom = inroom(u.ux, u.uy); if(uroom >= 0) { int tmp = rooms[uroom].fdoor; int cnt = rooms[uroom].doorct; int fx = u.ux, fy = u.uy; while(cnt--) { if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){ fx = doors[tmp].x; fy = doors[tmp].y; } tmp++; } tmp_at(-1, md->data->mlet); /* open call */ if(away) { /* interchange origin and destination */ unpmon(md); tmp = fx; fx = md->mx; md->mx = tmp; tmp = fy; fy = md->my; md->my = tmp; } while(fx != md->mx || fy != md->my) { int dx,dy,nfx = fx,nfy = fy,d1,d2; tmp_at(fx,fy); d1 = DIST(fx,fy,md->mx,md->my); for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++) if(dx || dy) { d2 = DIST(fx+dx,fy+dy,md->mx,md->my); if(d2 < d1) { d1 = d2; nfx = fx+dx; nfy = fy+dy; } } if(nfx != fx || nfy != fy) { fx = nfx; fy = nfy; } else { if(!away) { md->mx = fx; md->my = fy; } break; } } tmp_at(-1,-1); /* close call */ } if(!away) pmon(md); } void readmail(void) { #ifdef DEF_MAILREADER /* This implies that UNIX is defined */ char *mr = 0; more(); if(!(mr = getenv("MAILREADER"))) mr = DEF_MAILREADER; if(child(1)){ execl(mr, mr, (char *)NULL); exit(1); } #else /* DEF_MAILREADER */ (void) page_file(mailbox, FALSE); #endif /* DEF_MAILREADER */ /* get new stat; not entirely correct: there is a small time window where we do not see new mail */ getmailstatus(); } #endif /* MAIL */ /* normalize file name - we don't like ..'s or /'s */ void regularize(char *s) { char *lp; while((lp = strchr(s, '.')) || (lp = strchr(s, '/'))) *lp = '_'; }
