nuq/source/sys_unix.c

/*
	sys_unix.c

	(description)

	Copyright (C) 1996-1997  Id Software, Inc.
	Copyright (C) 2000       Marcus Sundberg [mackan@stacken.kth.se]

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

	See the GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <string.h>
#include <ctype.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <errno.h>

#include "quakedef.h"

qboolean			isDedicated;

int nostdout = 0;

char *basedir = ".";
char *cachedir = "/tmp";

cvar_t  sys_linerefresh = {"sys_linerefresh","0"};// set for entity display
cvar_t	timestamps = {"timestamps", "0"};			// Set for timestamps
cvar_t	timeformat = {"timeformat", "[%b %e %X] "}; // Default timestamp format

/* The translation table between the graphical font and plain ASCII  --KB */
static char qfont_table[256] = {
	'\0', '#',  '#',  '#',  '#',  '.',  '#',  '#',
	'#',  9,    10,   '#',  ' ',  13,   '.',  '.',
	'[',  ']',  '0',  '1',  '2',  '3',  '4',  '5',
	'6',  '7',  '8',  '9',  '.',  '<',  '=',  '>',
	' ',  '!',  '"',  '#',  '$',  '%',  '&',  '\'',
	'(',  ')',  '*',  '+',  ',',  '-',  '.',  '/',
	'0',  '1',  '2',  '3',  '4',  '5',  '6',  '7',
	'8',  '9',  ':',  ';',  '<',  '=',  '>',  '?',
	'@',  'A',  'B',  'C',  'D',  'E',  'F',  'G',
	'H',  'I',  'J',  'K',  'L',  'M',  'N',  'O',
	'P',  'Q',  'R',  'S',  'T',  'U',  'V',  'W',
	'X',  'Y',  'Z',  '[',  '\\', ']',  '^',  '_',
	'`',  'a',  'b',  'c',  'd',  'e',  'f',  'g',
	'h',  'i',  'j',  'k',  'l',  'm',  'n',  'o',
	'p',  'q',  'r',  's',  't',  'u',  'v',  'w',
	'x',  'y',  'z',  '{',  '|',  '}',  '~',  '<',

	'<',  '=',  '>',  '#',  '#',  '.',  '#',  '#',
	'#',  '#',  ' ',  '#',  ' ',  '>',  '.',  '.',
	'[',  ']',  '0',  '1',  '2',  '3',  '4',  '5',
	'6',  '7',  '8',  '9',  '.',  '<',  '=',  '>',
	' ',  '!',  '"',  '#',  '$',  '%',  '&',  '\'',
	'(',  ')',  '*',  '+',  ',',  '-',  '.',  '/',
	'0',  '1',  '2',  '3',  '4',  '5',  '6',  '7',
	'8',  '9',  ':',  ';',  '<',  '=',  '>',  '?',
	'@',  'A',  'B',  'C',  'D',  'E',  'F',  'G',
	'H',  'I',  'J',  'K',  'L',  'M',  'N',  'O',
	'P',  'Q',  'R',  'S',  'T',  'U',  'V',  'W',
	'X',  'Y',  'Z',  '[',  '\\', ']',  '^',  '_',
	'`',  'a',  'b',  'c',  'd',  'e',  'f',  'g',
	'h',  'i',  'j',  'k',  'l',  'm',  'n',  'o', 
	'p',  'q',  'r',  's',  't',  'u',  'v',  'w',
	'x',  'y',  'z',  '{',  '|',  '}',  '~',  '<'
};

/*
 *	File I/O
 */

/*
	Sys_FileTime

	Returns -1 if file not present
*/
int
Sys_FileTime (char *path)
{
	struct stat 	buf;
	
	if (stat (path, &buf) == -1)
		return -1;
	
	return buf.st_mtime;
}

/*
	Sys_mkdir

	Creates a directory
*/
void
Sys_mkdir (char *path)
{
	mkdir (path, 0777);
}

int
Sys_FileOpenRead (char *path, int *handle)
{
	struct stat fileinfo;
	int 		h;

	h = open (path, O_RDONLY, 0666);
	*handle = h;
	if (h == -1)
		return -1;
	
	if (fstat (h, &fileinfo) == -1)
		Sys_Error ("Error fstating %s", path);

	return fileinfo.st_size;
}

int
Sys_FileOpenWrite (char *path)
{
	int handle;

	umask (0);
	
	handle = open (path, O_RDWR | O_CREAT | O_TRUNC, 0666);

	if (handle == -1)
		Sys_Error ("Error opening %s: %s", path,strerror(errno));

	return handle;
}

int
Sys_FileWrite (int handle, void *src, int count)
{
	return write (handle, src, count);
}

void
Sys_FileClose (int handle)
{
	close (handle);
}

void
Sys_FileSeek (int handle, int position)
{
	lseek (handle, position, SEEK_SET);
}

int
Sys_FileRead (int handle, void *dest, int count)
{
    return read (handle, dest, count);
}

void
Sys_DebugLog(char *file, char *fmt, ...)
{
    va_list argptr; 
    static char data[1024];
    int fd;
    
    va_start (argptr, fmt);
    vsprintf (data, fmt, argptr);
    va_end (argptr);

    fd = open(file, O_WRONLY | O_CREAT | O_APPEND, 0666);
    write (fd, data, strlen(data));
    close (fd);
}

void
Sys_EditFile (char *filename)
{
	char cmd[256];
	char *term;
	char *editor;

	term = getenv ("TERM");
	if (term && !strcmp(term, "xterm")) {
		editor = getenv ("VISUAL");
		if (!editor)
			editor = getenv ("EDITOR");
		if (!editor)
			editor = getenv ("EDIT");
		if (!editor)
			editor = "vi";
		sprintf (cmd, "xterm -e %s %s", editor, filename);
		system (cmd);
	}
}

/*
 *	System I/O
 */

void
Sys_MakeCodeWriteable (unsigned long startaddr, unsigned long length)
{
	int 			r;
	unsigned long	addr;
	int 			psize = getpagesize();

	addr = (startaddr & ~(psize-1)) - psize;

//	fprintf(stderr, "writable code %lx(%lx)-%lx, length=%lx\n", startaddr,
//			addr, startaddr+length, length);

	r = mprotect ((char *) addr, length + startaddr - addr + psize, 7);

	if (r < 0)
		Sys_Error("Protection change failed\n");

}

void Sys_DebugNumber(int y, int val)
{
}

#define MAX_PRINT_MSG	4096
void
Sys_Printf (char *fmt, ...)
{
	va_list		argptr;
	char		start[MAX_PRINT_MSG];	// String we started with
	char		stamp[MAX_PRINT_MSG];	// Time stamp
	char		final[MAX_PRINT_MSG];	// String we print
	
	time_t		mytime = 0;
	struct tm	*local = NULL;

	unsigned char		*p;

	va_start (argptr, fmt);
	vsnprintf (start, sizeof(start), fmt, argptr);
	va_end (argptr);

    if (nostdout)
        return;

	if (timestamps.value && timeformat.string) {
		mytime = time (NULL);
		local = localtime (&mytime);
		strftime (stamp, sizeof (stamp), timeformat.string, local);
		
		snprintf (final, sizeof (final), "%s%s", stamp, start);
	} else {
		snprintf (final, sizeof (final), "%s", start);
	}

	for (p = (unsigned char *) final; *p; p++) {
		putc (qfont_table[*p], stdout);
	}
	fflush (stdout);
}

void
Sys_Error (char *error, ...)
{ 
    va_list     argptr;
    char        string[1024];

// change stdin to non blocking
    fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~FNDELAY);
    
    va_start (argptr,error);
    vsprintf (string,error,argptr);
    va_end (argptr);
	fprintf(stderr, "Error: %s\n", string);

	Host_Shutdown ();
	exit (1);

} 

void
Sys_Quit (void)
{
	Host_Shutdown ();
    fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~FNDELAY);
	fflush(stdout);
	exit (0);
}

void
Sys_Init (void)
{
#ifdef USE_INTEL_ASM
	Sys_SetFPCW();
#endif
}

void
Sys_Warn (char *warning, ...)
{ 
	va_list 	argptr;
    char		string[1024];

	va_start (argptr, warning);
	vsprintf (string, warning, argptr);
	va_end (argptr);
	fprintf (stderr, "Warning: %s", string);
} 

double
Sys_DoubleTime (void)
{
	struct timeval	tp;
	struct timezone tzp; 
	static int		secbase; 
    
	gettimeofday(&tp, &tzp);  

	if (!secbase) {
		secbase = tp.tv_sec;
		return tp.tv_usec/1000000.0;
	}

	return (tp.tv_sec - secbase) + tp.tv_usec/1000000.0;
}

// =======================================================================
// Sleeps for microseconds
// =======================================================================

static volatile int oktogo;

void alarm_handler(int x)
{
	oktogo=1;
}

void Sys_LineRefresh(void)
{
}

void floating_point_exception_handler(int whatever)
{
//	Sys_Warn("floating point exception\n");
	signal(SIGFPE, floating_point_exception_handler);
}

char *Sys_ConsoleInput(void)
{
    static char text[256];
    int     len;
	fd_set	fdset;
    struct timeval timeout;

	if (cls.state == ca_dedicated) {
		FD_ZERO(&fdset);
		FD_SET(0, &fdset); // stdin
		timeout.tv_sec = 0;
		timeout.tv_usec = 0;
		if (select (1, &fdset, NULL, NULL, &timeout) == -1 || !FD_ISSET(0, &fdset))
			return NULL;

		len = read (0, text, sizeof(text));
		if (len < 1)
			return NULL;
		text[len-1] = 0;    // rip off the /n and terminate

		return text;
	}
	return NULL;
}

#ifndef USE_INTEL_ASM
void Sys_HighFPPrecision (void)
{
}

void Sys_LowFPPrecision (void)
{
}
#endif

int main (int c, char **v)
{

	double		time, oldtime, newtime;
	quakeparms_t parms;
	extern int vcrFile;
	extern int recording;
	int j;

//	static char cwd[1024];

//	signal(SIGFPE, floating_point_exception_handler);
	signal(SIGFPE, SIG_IGN);

	memset(&parms, 0, sizeof(parms));

	COM_InitArgv(c, v);
	parms.argc = com_argc;
	parms.argv = com_argv;

#ifdef GLQUAKE
	parms.memsize = 16*1024*1024;
#else
	parms.memsize = 8*1024*1024;
#endif

	j = COM_CheckParm("-mem");
	if (j)
		parms.memsize = (int) (Q_atof(com_argv[j+1]) * 1024 * 1024);
	parms.membase = malloc (parms.memsize);

	parms.basedir = basedir;
// caching is disabled by default, use -cachedir to enable
//	parms.cachedir = cachedir;

	fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | FNDELAY);

    Host_Init(&parms);

	Sys_Init();

	if (COM_CheckParm("-nostdout"))
		nostdout = 1;
	else {
		fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | FNDELAY);
		printf ("Quake -- Version %s\n", QUAKE_VERSION);
	}

    oldtime = Sys_DoubleTime () - 0.1;
    while (1)
    {
// find time spent rendering last frame
        newtime = Sys_DoubleTime ();
        time = newtime - oldtime;

        if (cls.state == ca_dedicated)
        {   // play vcrfiles at max speed
            if (time < sys_ticrate.value && (vcrFile == -1 || recording) )
            {
				usleep(1);
                continue;       // not time to run a server only tic yet
            }
            time = sys_ticrate.value;
        }

        if (time > sys_ticrate.value*2)
            oldtime = newtime;
        else
            oldtime += time;

        Host_Frame (time);

// graphic debugging aids
        if (sys_linerefresh.value)
            Sys_LineRefresh ();
    }

}