4.4BSD/usr/src/games/hack/hack.unix.c
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* hack.unix.c - version 1.0.3 */
/* 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 <stdio.h>
#include <errno.h>
#include "hack.h" /* mainly for index() which depends on BSD */
#include <sys/types.h> /* for time_t and stat */
#include <sys/stat.h>
#ifdef BSD
#include <sys/time.h>
#else
#include <time.h>
#endif BSD
extern char *getenv();
extern time_t time();
setrandom()
{
(void) srandom((int) time ((time_t *) 0));
}
struct tm *
getlt()
{
time_t date;
struct tm *localtime();
(void) time(&date);
return(localtime(&date));
}
getyear()
{
return(1900 + getlt()->tm_year);
}
char *
getdate()
{
static char datestr[7];
register struct tm *lt = getlt();
(void) sprintf(datestr, "%2d%2d%2d",
lt->tm_year, lt->tm_mon + 1, lt->tm_mday);
if(datestr[2] == ' ') datestr[2] = '0';
if(datestr[4] == ' ') datestr[4] = '0';
return(datestr);
}
phase_of_the_moon() /* 0-7, with 0: new, 4: full */
{ /* moon period: 29.5306 days */
/* year: 365.2422 days */
register struct tm *lt = getlt();
register 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 );
}
night()
{
register int hour = getlt()->tm_hour;
return(hour < 6 || hour > 21);
}
midnight()
{
return(getlt()->tm_hour == 0);
}
struct stat buf, hbuf;
gethdate(name) char *name; {
/* old version - for people short of space */
/*
/* register char *np;
/* if(stat(name, &hbuf))
/* error("Cannot get status of %s.",
/* (np = rindex(name, '/')) ? np+1 : name);
/*
/* version using PATH from: seismo!gregc@ucsf-cgl.ARPA (Greg Couch) */
/*
* The problem with #include <sys/param.h> is that this include file
* does not exist on all systems, and moreover, that it sometimes includes
* <sys/types.h> again, so that the compiler sees these typedefs twice.
*/
#define MAXPATHLEN 1024
register char *np, *path;
char filename[MAXPATHLEN+1];
if (index(name, '/') != NULL || (path = getenv("PATH")) == NULL)
path = "";
for (;;) {
if ((np = index(path, ':')) == NULL)
np = path + strlen(path); /* point to end str */
if (np - path <= 1) /* %% */
(void) strcpy(filename, name);
else {
(void) strncpy(filename, path, np - path);
filename[np - path] = '/';
(void) strcpy(filename + (np - path) + 1, name);
}
if (stat(filename, &hbuf) == 0)
return;
if (*np == '\0')
break;
path = np + 1;
}
error("Cannot get status of %s.",
(np = rindex(name, '/')) ? np+1 : name);
}
uptodate(fd) {
if(fstat(fd, &buf)) {
pline("Cannot get status of saved level? ");
return(0);
}
if(buf.st_mtime < hbuf.st_mtime) {
pline("Saved level is out of date. ");
return(0);
}
return(1);
}
/* see whether we should throw away this xlock file */
veryold(fd) {
register 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 */
extern int errno;
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! */
}
getlock()
{
extern int errno, hackpid, locknum;
register int i = 0, fd;
(void) fflush(stdout);
/* we ignore QUIT and INT at this point */
if (link(HLOCK, LLOCK) == -1) {
register 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("");
/*NOTREACHED*/
}
regularize(lock);
glo(0);
if(locknum > 25) locknum = 25;
do {
if(locknum) lock[0] = 'a' + i++;
if((fd = open(lock, 0)) == -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 = creat(lock, 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.
*/
#include "def.mkroom.h"
static struct stat omstat,nmstat;
static char *mailbox;
static long laststattime;
getmailstatus() {
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
}
}
ckmailstatus() {
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 ... */
}
}
newmail() {
/* produce a scroll of mail */
register struct obj *obj;
register struct monst *md;
extern char plname[];
extern struct obj *mksobj(), *addinv();
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 */
mdrush(md,away)
register struct monst *md;
boolean away;
{
register int uroom = inroom(u.ux, u.uy);
if(uroom >= 0) {
register int tmp = rooms[uroom].fdoor;
register int cnt = rooms[uroom].doorct;
register 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) {
register 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);
}
readmail() {
#ifdef DEF_MAILREADER /* This implies that UNIX is defined */
register char *mr = 0;
more();
if(!(mr = getenv("MAILREADER")))
mr = DEF_MAILREADER;
if(child(1)){
execl(mr, mr, (char *) 0);
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
regularize(s) /* normalize file name - we don't like ..'s or /'s */
register char *s;
{
register char *lp;
while((lp = index(s, '.')) || (lp = index(s, '/')))
*lp = '_';
}