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/* SCCS Id: @(#)unixunix.c 3.0 88/04/13
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* NetHack may be freely redistributed. See license for details. */
/* This file collects some Unix dependencies; pager.c contains some more */
/*
* The time is used for:
* - seed for rand()
* - 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"
*/
/* block some unused #defines to avoid overloading some cpp's */
#define MONATTK_H
#define MONFLAG_H
#include "hack.h" /* mainly for index() which depends on BSD */
#include <errno.h>
#include <sys/stat.h>
#ifdef NO_FILE_LINKS
#include <fcntl.h>
#endif
void
setrandom()
{
#if defined(SYSV) || defined(DGUX)
(void) Srand((long) time ((time_t *) 0));
#else
#ifdef ULTRIX
Srand((int)time((time_t *)0));
#else
(void) Srand((int) time ((long *) 0));
#endif /* ULTRIX */
#endif /* SYSV */
}
static struct tm *
getlt()
{
time_t date;
#ifdef BSD
(void) time((long *)(&date));
#else
(void) time(&date);
#endif
#if defined(ULTRIX) || defined(BSD)
return(localtime((long *)(&date)));
#else
return(localtime(&date));
#endif /* ULTRIX */
}
int
getyear()
{
return(1900 + getlt()->tm_year);
}
char *
getdate()
{
#ifdef LINT /* static char datestr[7]; */
char datestr[7];
#else
static char datestr[7];
#endif
register struct tm *lt = getlt();
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);
}
int
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, goldn;
diy = lt->tm_yday;
goldn = (lt->tm_year % 19) + 1;
epact = (11 * goldn + 18) % 30;
if ((epact == 25 && goldn > 11) || epact == 24)
epact++;
return( (((((diy + epact) * 6) + 11) % 177) / 22) & 7 );
}
int
night()
{
register int hour = getlt()->tm_hour;
return(hour < 6 || hour > 21);
}
int
midnight()
{
return(getlt()->tm_hour == 0);
}
static struct stat buf, hbuf;
void
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) /* %% */
Strcpy(filename, name);
else {
(void) strncpy(filename, path, np - path);
filename[np - path] = '/';
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);
}
int
uptodate(fd)
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(fd)
int 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 */
#ifdef BSD
(void) time((long *)(&date));
#else
(void) time(&date);
#endif
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. */
#ifndef NETWORK
/* It will do a VERY BAD THING if the playground is shared
by more than one machine! -pem */
if(!(kill(lockedpid, 0) == -1 && errno == ESRCH))
#endif
return(0);
}
(void) close(fd);
for(i = 1; i <= MAXLEVEL+1; 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 errno;
register int i = 0, fd;
#ifdef NO_FILE_LINKS
int hlockfd ;
int sleepct = 20 ;
#endif
#ifdef HARD
/* idea from rpick%ucqais@uccba.uc.edu
* prevent automated rerolling of characters
* test input (fd0) so that tee'ing output to get a screen dump still
* works
* also incidentally prevents development of any hack-o-matic programs
*/
#ifndef NEXT
if (!isatty(0))
error("You must play from a terminal.");
#endif /* NEXT */
#endif
(void) fflush(stdout);
/* we ignore QUIT and INT at this point */
#ifdef NO_FILE_LINKS
while ((hlockfd = open(LLOCK,O_RDONLY|O_CREAT|O_EXCL,0644)) == -1) {
if (--sleepct) {
Printf( "Lock file in use. %d retries left.\n",sleepct);
(void) fflush(stdout);
# if defined(SYSV) || defined(ULTRIX)
(void)
# endif
sleep(1);
} else {
Printf("I give up! Try again later.\n");
getret();
error("");
}
}
(void) close(hlockfd);
#else /* NO_FILE_LINKS */
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*/
}
#endif /* NO_FILE_LINKS */
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, FCMASK);
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");
}
}
}
void
regularize(s) /* normalize file name - we don't like .'s, /'s, spaces */
register char *s;
{
register char *lp;
while((lp=index(s, '.')) || (lp=index(s, '/')) || (lp=index(s,' ')))
*lp = '_';
#ifdef SYSV
/* avoid problems with 14 character file name limit */
# ifdef COMPRESS
if(strlen(s) > 10)
/* leave room for .e from error and .Z from compress
* appended to save files */
s[10] = '\0';
# else
if(strlen(s) > 11)
/* leave room for .nn appended to level files */
s[11] = '\0';
# endif
#endif
}
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