431 lines
10 KiB
C
431 lines
10 KiB
C
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
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/* hack.unix.c - version 1.0.3 */
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/* This file collects some Unix dependencies; hack.pager.c contains some more */
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/*
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* The time is used for:
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* - seed for random()
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* - year on tombstone and yymmdd in record file
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* - phase of the moon (various monsters react to NEW_MOON or FULL_MOON)
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* - night and midnight (the undead are dangerous at midnight)
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* - determination of what files are "very old"
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*/
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#include <stdio.h>
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#include <errno.h>
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#include "hack.h" /* mainly for index() which depends on BSD */
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#include <sys/types.h> /* for time_t and stat */
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#include <sys/stat.h>
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#ifdef BSD
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#include <sys/time.h>
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#else
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#include <time.h>
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#endif BSD
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extern char *getenv();
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extern time_t time();
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setrandom()
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{
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(void) srandom((int) time ((time_t *) 0));
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}
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struct tm *
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getlt()
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{
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time_t date;
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struct tm *localtime();
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(void) time(&date);
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return(localtime(&date));
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}
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getyear()
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{
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return(1900 + getlt()->tm_year);
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}
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char *
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getdate()
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{
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static char datestr[7];
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register struct tm *lt = getlt();
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(void) sprintf(datestr, "%2d%2d%2d",
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lt->tm_year, lt->tm_mon + 1, lt->tm_mday);
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if(datestr[2] == ' ') datestr[2] = '0';
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if(datestr[4] == ' ') datestr[4] = '0';
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return(datestr);
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}
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phase_of_the_moon() /* 0-7, with 0: new, 4: full */
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{ /* moon period: 29.5306 days */
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/* year: 365.2422 days */
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register struct tm *lt = getlt();
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register int epact, diy, golden;
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diy = lt->tm_yday;
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golden = (lt->tm_year % 19) + 1;
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epact = (11 * golden + 18) % 30;
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if ((epact == 25 && golden > 11) || epact == 24)
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epact++;
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return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 );
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}
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night()
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{
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register int hour = getlt()->tm_hour;
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return(hour < 6 || hour > 21);
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}
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midnight()
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{
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return(getlt()->tm_hour == 0);
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}
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struct stat buf, hbuf;
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gethdate(name) char *name; {
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/* old version - for people short of space */
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/*
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/* register char *np;
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/* if(stat(name, &hbuf))
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/* error("Cannot get status of %s.",
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/* (np = rindex(name, '/')) ? np+1 : name);
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/*
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/* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */
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/*
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* The problem with #include <sys/param.h> is that this include file
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* does not exist on all systems, and moreover, that it sometimes includes
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* <sys/types.h> again, so that the compiler sees these typedefs twice.
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*/
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#define MAXPATHLEN 1024
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register char *np, *path;
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char filename[MAXPATHLEN+1];
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if (index(name, '/') != NULL || (path = getenv("PATH")) == NULL)
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path = "";
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for (;;) {
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if ((np = index(path, ':')) == NULL)
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np = path + strlen(path); /* point to end str */
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if (np - path <= 1) /* %% */
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(void) strcpy(filename, name);
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else {
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(void) strncpy(filename, path, np - path);
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filename[np - path] = '/';
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(void) strcpy(filename + (np - path) + 1, name);
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}
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if (stat(filename, &hbuf) == 0)
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return;
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if (*np == '\0')
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break;
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path = np + 1;
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}
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error("Cannot get status of %s.",
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(np = rindex(name, '/')) ? np+1 : name);
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}
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uptodate(fd) {
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if(fstat(fd, &buf)) {
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pline("Cannot get status of saved level? ");
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return(0);
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}
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if(buf.st_mtime < hbuf.st_mtime) {
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pline("Saved level is out of date. ");
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return(0);
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}
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return(1);
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}
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/* see whether we should throw away this xlock file */
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veryold(fd) {
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register int i;
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time_t date;
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if(fstat(fd, &buf)) return(0); /* cannot get status */
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if(buf.st_size != sizeof(int)) return(0); /* not an xlock file */
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(void) time(&date);
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if(date - buf.st_mtime < 3L*24L*60L*60L) { /* recent */
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extern int errno;
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int lockedpid; /* should be the same size as hackpid */
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if(read(fd, (char *)&lockedpid, sizeof(lockedpid)) !=
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sizeof(lockedpid))
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/* strange ... */
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return(0);
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/* From: Rick Adams <seismo!rick>
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/* This will work on 4.1cbsd, 4.2bsd and system 3? & 5.
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/* It will do nothing on V7 or 4.1bsd. */
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if(!(kill(lockedpid, 0) == -1 && errno == ESRCH))
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return(0);
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}
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(void) close(fd);
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for(i = 1; i <= MAXLEVEL; i++) { /* try to remove all */
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glo(i);
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(void) unlink(lock);
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}
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glo(0);
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if(unlink(lock)) return(0); /* cannot remove it */
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return(1); /* success! */
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}
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getlock()
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{
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extern int errno, hackpid, locknum;
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register int i = 0, fd;
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(void) fflush(stdout);
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/* we ignore QUIT and INT at this point */
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if (link(HLOCK, LLOCK) == -1) {
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register int errnosv = errno;
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perror(HLOCK);
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printf("Cannot link %s to %s\n", LLOCK, HLOCK);
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switch(errnosv) {
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case ENOENT:
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printf("Perhaps there is no (empty) file %s ?\n", HLOCK);
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break;
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case EACCES:
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printf("It seems you don't have write permission here.\n");
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break;
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case EEXIST:
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printf("(Try again or rm %s.)\n", LLOCK);
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break;
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default:
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printf("I don't know what is wrong.");
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}
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getret();
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error("");
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/*NOTREACHED*/
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}
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regularize(lock);
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glo(0);
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if(locknum > 25) locknum = 25;
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do {
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if(locknum) lock[0] = 'a' + i++;
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if((fd = open(lock, 0)) == -1) {
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if(errno == ENOENT) goto gotlock; /* no such file */
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perror(lock);
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(void) unlink(LLOCK);
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error("Cannot open %s", lock);
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}
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if(veryold(fd)) /* if true, this closes fd and unlinks lock */
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goto gotlock;
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(void) close(fd);
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} while(i < locknum);
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(void) unlink(LLOCK);
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error(locknum ? "Too many hacks running now."
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: "There is a game in progress under your name.");
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gotlock:
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fd = creat(lock, FMASK);
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if(unlink(LLOCK) == -1)
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error("Cannot unlink %s.", LLOCK);
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if(fd == -1) {
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error("cannot creat lock file.");
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} else {
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if(write(fd, (char *) &hackpid, sizeof(hackpid))
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!= sizeof(hackpid)){
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error("cannot write lock");
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}
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if(close(fd) == -1) {
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error("cannot close lock");
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}
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}
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}
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#ifdef MAIL
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/*
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* Notify user when new mail has arrived. [Idea from Merlyn Leroy, but
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* I don't know the details of his implementation.]
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* { Later note: he disliked my calling a general mailreader and felt that
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* hack should do the paging itself. But when I get mail, I want to put it
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* in some folder, reply, etc. - it would be unreasonable to put all these
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* functions in hack. }
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* The mail daemon '2' is at present not a real monster, but only a visual
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* effect. Thus, makemon() is superfluous. This might become otherwise,
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* however. The motion of '2' is less restrained than usual: diagonal moves
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* from a DOOR are possible. He might also use SDOOR's. Also, '2' is visible
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* in a ROOM, even when you are Blind.
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* Its path should be longer when you are Telepat-hic and Blind.
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*
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* Interesting side effects:
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* - You can get rich by sending yourself a lot of mail and selling
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* it to the shopkeeper. Unfortunately mail isn't very valuable.
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* - You might die in case '2' comes along at a critical moment during
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* a fight and delivers a scroll the weight of which causes you to
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* collapse.
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*
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* Possible extensions:
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* - Open the file MAIL and do fstat instead of stat for efficiency.
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* (But sh uses stat, so this cannot be too bad.)
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* - Examine the mail and produce a scroll of mail called "From somebody".
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* - Invoke MAILREADER in such a way that only this single letter is read.
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*
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* - Make him lose his mail when a Nymph steals the letter.
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* - Do something to the text when the scroll is enchanted or cancelled.
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*/
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#include "def.mkroom.h"
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static struct stat omstat,nmstat;
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static char *mailbox;
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static long laststattime;
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getmailstatus() {
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if(!(mailbox = getenv("MAIL")))
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return;
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if(stat(mailbox, &omstat)){
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#ifdef PERMANENT_MAILBOX
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pline("Cannot get status of MAIL=%s .", mailbox);
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mailbox = 0;
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#else
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omstat.st_mtime = 0;
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#endif PERMANENT_MAILBOX
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}
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}
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ckmailstatus() {
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if(!mailbox
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#ifdef MAILCKFREQ
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|| moves < laststattime + MAILCKFREQ
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#endif MAILCKFREQ
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)
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return;
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laststattime = moves;
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if(stat(mailbox, &nmstat)){
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#ifdef PERMANENT_MAILBOX
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pline("Cannot get status of MAIL=%s anymore.", mailbox);
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mailbox = 0;
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#else
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nmstat.st_mtime = 0;
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#endif PERMANENT_MAILBOX
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} else if(nmstat.st_mtime > omstat.st_mtime) {
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if(nmstat.st_size)
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newmail();
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getmailstatus(); /* might be too late ... */
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}
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}
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newmail() {
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/* produce a scroll of mail */
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register struct obj *obj;
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register struct monst *md;
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extern char plname[];
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extern struct obj *mksobj(), *addinv();
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extern struct monst *makemon();
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extern struct permonst pm_mail_daemon;
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obj = mksobj(SCR_MAIL);
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if(md = makemon(&pm_mail_daemon, u.ux, u.uy)) /* always succeeds */
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mdrush(md,0);
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pline("\"Hello, %s! I have some mail for you.\"", plname);
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if(md) {
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if(dist(md->mx,md->my) > 2)
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pline("\"Catch!\"");
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more();
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/* let him disappear again */
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mdrush(md,1);
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mondead(md);
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}
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obj = addinv(obj);
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(void) identify(obj); /* set known and do prinv() */
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}
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/* make md run through the cave */
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mdrush(md,away)
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register struct monst *md;
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boolean away;
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{
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register int uroom = inroom(u.ux, u.uy);
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if(uroom >= 0) {
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register int tmp = rooms[uroom].fdoor;
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register int cnt = rooms[uroom].doorct;
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register int fx = u.ux, fy = u.uy;
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while(cnt--) {
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if(dist(fx,fy) < dist(doors[tmp].x, doors[tmp].y)){
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fx = doors[tmp].x;
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fy = doors[tmp].y;
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}
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tmp++;
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}
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tmp_at(-1, md->data->mlet); /* open call */
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if(away) { /* interchange origin and destination */
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unpmon(md);
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tmp = fx; fx = md->mx; md->mx = tmp;
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tmp = fy; fy = md->my; md->my = tmp;
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}
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while(fx != md->mx || fy != md->my) {
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register int dx,dy,nfx = fx,nfy = fy,d1,d2;
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tmp_at(fx,fy);
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d1 = DIST(fx,fy,md->mx,md->my);
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for(dx = -1; dx <= 1; dx++) for(dy = -1; dy <= 1; dy++)
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if(dx || dy) {
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d2 = DIST(fx+dx,fy+dy,md->mx,md->my);
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if(d2 < d1) {
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d1 = d2;
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nfx = fx+dx;
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nfy = fy+dy;
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}
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}
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if(nfx != fx || nfy != fy) {
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fx = nfx;
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fy = nfy;
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} else {
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if(!away) {
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md->mx = fx;
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md->my = fy;
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}
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break;
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}
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}
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tmp_at(-1,-1); /* close call */
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}
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if(!away)
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pmon(md);
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}
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readmail() {
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#ifdef DEF_MAILREADER /* This implies that UNIX is defined */
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register char *mr = 0;
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more();
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if(!(mr = getenv("MAILREADER")))
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mr = DEF_MAILREADER;
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if(child(1)){
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execl(mr, mr, (char *) 0);
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exit(1);
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}
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#else DEF_MAILREADER
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(void) page_file(mailbox, FALSE);
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#endif DEF_MAILREADER
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/* get new stat; not entirely correct: there is a small time
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window where we do not see new mail */
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getmailstatus();
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}
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#endif MAIL
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regularize(s) /* normalize file name - we don't like ..'s or /'s */
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register char *s;
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{
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register char *lp;
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while((lp = index(s, '.')) || (lp = index(s, '/')))
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*lp = '_';
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}
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