OpenBSD-4.6/games/hack/hack.unix.c
/* $OpenBSD: hack.unix.c,v 1.13 2003/05/19 06:30:56 pjanzen 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.
*/
#ifndef lint
static const char rcsid[] = "$OpenBSD: hack.unix.c,v 1.13 2003/05/19 06:30:56 pjanzen Exp $";
#endif /* not lint */
/* 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/types.h> /* for time_t and stat */
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/time.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.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()
{
time_t date;
struct tm *localtime();
(void) time(&date);
return(localtime(&date));
}
int
getyear()
{
return(1900 + getlt()->tm_year);
}
char *
getdate()
{
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);
}
int
phase_of_the_moon() /* 0-7, with 0: new, 4: full */
{ /* moon period: 29.5306 days */
/* year: 365.2422 days */
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()
{
int hour = getlt()->tm_hour;
return(hour < 6 || hour > 21);
}
int
midnight()
{
return(getlt()->tm_hour == 0);
}
struct stat buf, hbuf;
void
gethdate(char *name)
{
char *p, *np, *path;
char filename[MAXPATHLEN+1];
if (strchr(name, '/') != NULL || (p = getenv("PATH")) == NULL)
p = "";
np = path = strdup(p); /* Make a copy for strsep. */
if (path == NULL)
err(1, NULL);
for (;;) {
if ((p = strsep(&np, ":")) == NULL)
break;
if (*p == '\0') /* :: */
(void) strlcpy(filename, name, sizeof filename);
else
(void) snprintf(filename, sizeof filename,
"%s/%s", p, name);
if (stat(filename, &hbuf) == 0) {
free(path);
return;
}
}
error("Cannot get status of %s.",
(p = strrchr(name, '/')) ? p+1 : name);
free(path);
}
int
uptodate(int 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 */
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()
{
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("");
/*NOTREACHED*/
}
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 = 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.
*/
static struct stat omstat,nmstat;
static char *mailbox;
static long laststattime;
void
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 */
}
}
void
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 ... */
}
}
static void
newmail()
{
/* 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()
{
#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 *) 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 */
/* normalize file name - we don't like ..'s or /'s */
void
regularize(char *s)
{
char *lp;
while((lp = strchr(s, '.')) || (lp = strchr(s, '/')))
*lp = '_';
}