machdep.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

/*
 * machdep.c
 *
 * This source herein may be modified and/or distributed by anybody who
 * so desires, with the following restrictions:
 *    1.)  No portion of this notice shall be removed.
 *    2.)  Credit shall not be taken for the creation of this source.
 *    3.)  This code is not to be traded, sold, or used for personal
 *         gain or profit.
 *
 */

#ifndef lint
static char sccsid[] = "@(#)machdep.c	5.2 (Berkeley) 11/25/87";
#endif /* not lint */

/* Included in this file are all system dependent routines.  Extensive use
 * of #ifdef's will be used to compile the appropriate code on each system:
 *
 *    UNIX:        all UNIX systems.
 *    UNIX_BSD4_2: UNIX BSD 4.2 and later, UTEK, (4.1 BSD too?)
 *    UNIX_SYSV:   UNIX system V
 *    UNIX_V7:     UNIX version 7
 *
 * All UNIX code should be included between the single "#ifdef UNIX" at the
 * top of this file, and the "#endif" at the bottom.
 * 
 * To change a routine to include a new UNIX system, simply #ifdef the
 * existing routine, as in the following example:
 *
 *   To make a routine compatible with UNIX system 5, change the first
 *   function to the second:
 *
 *      md_function()
 *      {
 *         code;
 *      }
 *
 *      md_function()
 *      {
 *      #ifdef UNIX_SYSV
 *         sys5code;
 *      #else
 *         code;
 *      #endif
 *      }
 *
 * Appropriate variations of this are of course acceptible.
 * The use of "#elseif" is discouraged because of non-portability.
 * If the correct #define doesn't exist, "UNIX_SYSV" in this case, make it up
 * and insert it in the list at the top of the file.  Alter the CFLAGS
 * in you Makefile appropriately.
 *
 */

#ifdef UNIX

#include <stdio.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <pwd.h>

#ifdef UNIX_BSD4_2
#include <sys/time.h>
#include <sgtty.h>
#endif

#ifdef UNIX_SYSV
#include <time.h>
#include <termio.h>
#endif

#include <signal.h>
#include "rogue.h"

/* md_slurp:
 *
 * This routine throws away all keyboard input that has not
 * yet been read.  It is used to get rid of input that the user may have
 * typed-ahead.
 *
 * This function is not necessary, so it may be stubbed.  The might cause
 * message-line output to flash by because the game has continued to read
 * input without waiting for the user to read the message.  Not such a
 * big deal.
 */

md_slurp()
{
	long ln = 0;

#ifdef UNIX_BSD4_2
	ioctl(0, FIONREAD, &ln);
#endif
#ifdef UNIX_SYSV
	ioctl(0, TCFLSH, &ln);
	ln = 0;
#endif

	ln += stdin->_cnt;

	for (; ln > 0; ln--) {
		(void) getchar();
	}
}

/* md_control_keyboard():
 *
 * This routine is much like md_cbreak_no_echo_nonl() below.  It sets up the
 * keyboard for appropriate input.  Specifically, it prevents the tty driver
 * from stealing characters.  For example, ^Y is needed as a command
 * character, but the tty driver intercepts it for another purpose.  Any
 * such behavior should be stopped.  This routine could be avoided if
 * we used RAW mode instead of CBREAK.  But RAW mode does not allow the
 * generation of keyboard signals, which the program uses.
 *
 * The parameter 'mode' when true, indicates that the keyboard should
 * be set up to play rogue.  When false, it should be restored if
 * necessary.
 *
 * This routine is not strictly necessary and may be stubbed.  This may
 * cause certain command characters to be unavailable.
 */

md_control_keybord(mode)
boolean mode;
{
	static boolean called_before = 0;
#ifdef UNIX_BSD4_2
	static struct ltchars ltc_orig;
	static struct tchars tc_orig;
	struct ltchars ltc_temp;
	struct tchars tc_temp;
#endif
#ifdef UNIX_SYSV
	static struct termio _oldtty;
	struct termio _tty;
#endif

	if (!called_before) {
		called_before = 1;
#ifdef UNIX_BSD4_2
		ioctl(0, TIOCGETC, &tc_orig);
		ioctl(0, TIOCGLTC, &ltc_orig);
#endif
#ifdef UNIX_SYSV
		ioctl(0, TCGETA, &_oldtty);
#endif
	}
#ifdef UNIX_BSD4_2
	ltc_temp = ltc_orig;
	tc_temp = tc_orig;
#endif
#ifdef UNIX_SYSV
	_tty = _oldtty;
#endif

	if (!mode) {
#ifdef UNIX_BSD4_2
		ltc_temp.t_suspc = ltc_temp.t_dsuspc = -1;
		ltc_temp.t_rprntc = ltc_temp.t_flushc = -1;
		ltc_temp.t_werasc = ltc_temp.t_lnextc = -1;
		tc_temp.t_startc = tc_temp.t_stopc = -1;
#endif
#ifdef UNIX_SYSV
		_tty.c_cc[VSWTCH] = CNSWTCH;
#endif
	}
#ifdef UNIX_BSD4_2
	ioctl(0, TIOCSETC, &tc_temp);
	ioctl(0, TIOCSLTC, &ltc_temp);
#endif
#ifdef UNIX_SYSV
	ioctl(0, TCSETA, &_tty);
#endif
}

/* md_heed_signals():
 *
 * This routine tells the program to call particular routines when
 * certain interrupts/events occur:
 *
 *      SIGINT: call onintr() to interrupt fight with monster or long rest.
 *      SIGQUIT: call byebye() to check for game termination.
 *      SIGHUP: call error_save() to save game when terminal hangs up.
 *
 *		On VMS, SIGINT and SIGQUIT correspond to ^C and ^Y.
 *
 * This routine is not strictly necessary and can be stubbed.  This will
 * mean that the game cannot be interrupted properly with keyboard
 * input, this is not usually critical.
 */

md_heed_signals()
{
	signal(SIGINT, onintr);
	signal(SIGQUIT, byebye);
	signal(SIGHUP, error_save);
}

/* md_ignore_signals():
 *
 * This routine tells the program to completely ignore the events mentioned
 * in md_heed_signals() above.  The event handlers will later be turned on
 * by a future call to md_heed_signals(), so md_heed_signals() and
 * md_ignore_signals() need to work together.
 *
 * This function should be implemented or the user risks interrupting
 * critical sections of code, which could cause score file, or saved-game
 * file, corruption.
 */

md_ignore_signals()
{
	signal(SIGQUIT, SIG_IGN);
	signal(SIGINT, SIG_IGN);
	signal(SIGHUP, SIG_IGN);
}

/* md_get_file_id():
 *
 * This function returns an integer that uniquely identifies the specified
 * file.  It need not check for the file's existence.  In UNIX, the inode
 * number is used.
 *
 * This function is used to identify saved-game files.
 */

int
md_get_file_id(fname)
char *fname;
{
	struct stat sbuf;

	if (stat(fname, &sbuf)) {
		return(-1);
	}
	return((int) sbuf.st_ino);
}

/* md_link_count():
 *
 * This routine returns the number of hard links to the specified file.
 *
 * This function is not strictly necessary.  On systems without hard links
 * this routine can be stubbed by just returning 1.
 */

int
md_link_count(fname)
char *fname;
{
	struct stat sbuf;

	stat(fname, &sbuf);
	return((int) sbuf.st_nlink);
}

/* md_gct(): (Get Current Time)
 *
 * This function returns the current year, month(1-12), day(1-31), hour(0-23),
 * minute(0-59), and second(0-59).  This is used for identifying the time
 * at which a game is saved.
 *
 * This function is not strictly necessary.  It can be stubbed by returning
 * zeros instead of the correct year, month, etc.  If your operating
 * system doesn't provide all of the time units requested here, then you
 * can provide only those that it does, and return zeros for the others.
 * If you cannot provide good time values, then users may be able to copy
 * saved-game files and play them.  
 */

md_gct(rt_buf)
struct rogue_time *rt_buf;
{
	struct tm *t, *localtime();
	long seconds;

	time(&seconds);
	t = localtime(&seconds);

	rt_buf->year = t->tm_year;
	rt_buf->month = t->tm_mon + 1;
	rt_buf->day = t->tm_mday;
	rt_buf->hour = t->tm_hour;
	rt_buf->minute = t->tm_min;
	rt_buf->second = t->tm_sec;
}

/* md_gfmt: (Get File Modification Time)
 *
 * This routine returns a file's date of last modification in the same format
 * as md_gct() above.
 *
 * This function is not strictly necessary.  It is used to see if saved-game
 * files have been modified since they were saved.  If you have stubbed the
 * routine md_gct() above by returning constant values, then you may do
 * exactly the same here.
 * Or if md_gct() is implemented correctly, but your system does not provide
 * file modification dates, you may return some date far in the past so
 * that the program will never know that a saved-game file being modified.  
 * You may also do this if you wish to be able to restore games from
 * saved-games that have been modified.
 */

md_gfmt(fname, rt_buf)
char *fname;
struct rogue_time *rt_buf;
{
	struct stat sbuf;
	long seconds;
	struct tm *t;

	stat(fname, &sbuf);
	seconds = (long) sbuf.st_mtime;
	t = localtime(&seconds);

	rt_buf->year = t->tm_year;
	rt_buf->month = t->tm_mon + 1;
	rt_buf->day = t->tm_mday;
	rt_buf->hour = t->tm_hour;
	rt_buf->minute = t->tm_min;
	rt_buf->second = t->tm_sec;
}

/* md_df: (Delete File)
 *
 * This function deletes the specified file, and returns true (1) if the
 * operation was successful.  This is used to delete saved-game files