/*
	cl_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 <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <signal.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/mman.h>

#include "cvar.h"
#include "host.h"
#include "qargs.h"
#include "sys.h"

int         noconinput = 0;
qboolean    is_server = false;


// =======================================================================
// General routines
// =======================================================================

/*
void Sys_Printf (char *fmt, ...)
{
	va_list		argptr;
	char		text[1024];
	
	va_start (argptr,fmt);
#ifdef HAVE_VSNPRINTF
        vsnprintf (text,sizeof(text),fmt,argptr);
#else
        vsprintf (text,fmt,argptr);
#endif
	va_end (argptr);
	fprintf(stderr, "%s", text);
	
	Con_Print (text);
}

void Sys_Printf (char *fmt, ...)
{

    va_list     argptr;
    char        text[1024], *t_p;
    int         l, r;

    if (nostdout)
        return;

    va_start (argptr,fmt);
#ifdef HAVE_VSNPRINTF
    vsnprintf (text,sizeof(text),fmt,argptr);
#else
    vsprintf (text,fmt,argptr);
#endif
    va_end (argptr);

    l = strlen(text);
    t_p = text;

// make sure everything goes through, even though we are non-blocking
    while (l)
    {
        r = write (1, text, l);
        if (r != l)
            sleep (0);
        if (r > 0)
        {
            t_p += r;
            l -= r;
        }
    }

}
*/

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

void
Sys_Init_Cvars (void)
{
	sys_nostdout = Cvar_Get ("sys_nostdout", "0", CVAR_NONE, "set to disable std out");
	if (COM_CheckParm ("-nostdout"))
		Cvar_Set (sys_nostdout, "1");
}

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

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) & ~O_NONBLOCK);

	va_start (argptr, error);
	vsnprintf (string, sizeof (string), error, argptr);
	va_end (argptr);
	fprintf (stderr, "Error: %s\n", string);

	Host_Shutdown ();
	exit (1);

}

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

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

void
Sys_DebugLog (char *file, char *fmt, ...)
{
	va_list     argptr;
	static char data[1024];				// why static ?
	int         fd;

	va_start (argptr, fmt);
	vsnprintf (data, sizeof (data), fmt, argptr);
	va_end (argptr);
//    fd = open(file, O_WRONLY | O_BINARY | O_CREAT | O_APPEND, 0666);
	fd = open (file, O_WRONLY | O_CREAT | O_APPEND, 0666);
	write (fd, data, strlen (data));
	close (fd);
}

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

char       *
Sys_ConsoleInput (void)
{
#if 0
	static char text[256];
	int         len;

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

		return text;
	}
#endif
	return NULL;
}

#ifndef USE_INTEL_ASM
void
Sys_HighFPPrecision (void)
{
}

void
Sys_LowFPPrecision (void)
{
}
#endif

int         skipframes;

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

	double      time, oldtime, newtime;
	int         j;

//  static char cwd[1024];

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

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

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

	host_parms.memsize = 8 * 1024 * 1024;	// 8MB default heap

	j = COM_CheckParm ("-mem");
	if (j)
		host_parms.memsize = (int) (atof (com_argv[j + 1]) * 1024 * 1024);
	host_parms.membase = malloc (host_parms.memsize);
	if (!host_parms.membase) {
		printf ("Can't allocate memory for zone.\n");
		return 1;
	}

	noconinput = COM_CheckParm ("-noconinput");
	if (!noconinput)
		fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) | O_NONBLOCK);

	Host_Init ();

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

		Host_Frame (time);
		oldtime = newtime;
	}

}


/*
================
Sys_MakeCodeWriteable
================
*/
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");

}