/*
	cl_sys_sdl.c

	(description)

	Copyright (C) 1996-1997  Id Software, Inc.

	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 <SDL\SDL.H>
#include <SDL\SDL_main.H>

#include <stdio.h>
#include <stdlib.h>

#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <io.h>
#include <conio.h>

#ifndef WIN32
#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>
#endif

#include "sys.h"
#include "qargs.h"
#include "quakedef.h"
#include "qargs.h"
#include "client.h"

qboolean is_server = false;

int		starttime;

#ifdef WIN32
#include "winquake.h"
// fixme: minimized is not currently supported under SDL
qboolean Minimized=false;
void MaskExceptions (void);
#endif

#define BASEDIR "."

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_CREAT | O_APPEND, 0666);
    write (fd, data, strlen(data));
    close (fd);
};

/*
===============================================================================

FILE IO

===============================================================================
*/

int	Sys_FileTime (char *path)
{
	QFile	*f;
	int		t, retval;

	f = Qopen(path, "rb");

	if (f)
	{
		Qclose(f);
		retval = 1;
	}
	else
        {
		retval = -1;
	}

	return retval;
}


/*
===============================================================================

SYSTEM IO

===============================================================================
*/

/*
================
Sys_MakeCodeWriteable
================
*/
void Sys_MakeCodeWriteable (unsigned long startaddr, unsigned long length)
{

#ifdef WIN32
	DWORD  flOldProtect;

//@@@ copy on write or just read-write?
	if (!VirtualProtect((LPVOID)startaddr, length, PAGE_READWRITE, &flOldProtect))
   		Sys_Error("Protection change failed\n");
#else
	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");
#endif
}


/*
================
Sys_Init
================
*/
void Sys_Init (void)
{

#ifdef WIN32
	OSVERSIONINFO	vinfo;
#endif

#ifdef USE_INTEL_ASM
#ifdef WIN32
	MaskExceptions ();
#endif
	Sys_SetFPCW ();
#endif

#ifdef WIN32
	// make sure the timer is high precision, otherwise
	// NT gets 18ms resolution
	timeBeginPeriod( 1 );

	vinfo.dwOSVersionInfoSize = sizeof(vinfo);

	if (!GetVersionEx (&vinfo))
		Sys_Error ("Couldn't get OS info");

	if ((vinfo.dwMajorVersion < 4) ||
		(vinfo.dwPlatformId == VER_PLATFORM_WIN32s))
	{
		Sys_Error ("This version of " PROGRAM " requires at least Win95 or NT 4.0");
	}
#endif

}


void Sys_Error (char *error, ...)
{
	va_list		argptr;
	char		text[1024];//, text2[1024];

#ifndef WIN32
        fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~O_NONBLOCK);
#endif
	va_start (argptr, error);
	vsnprintf (text, sizeof(text), error, argptr);
	va_end (argptr);

#ifdef WIN32
	MessageBox(NULL, text, "Error", 0 /* MB_OK */ );
#endif
        fprintf(stderr, "Error: %s\n", text);

        Host_Shutdown ();
	exit (1);
}

void Sys_Printf (char *fmt, ...)
{
	va_list		argptr;

	va_start (argptr,fmt);
	vprintf (fmt, argptr);

	va_end (argptr);
}

void Sys_Quit (void)
{
	Host_Shutdown();
	exit (0);
}

char *Sys_ConsoleInput (void)
{
	return NULL;
}

void Sys_Sleep (void)
{
}


void
Sys_Init_Cvars (void)
{
	sys_nostdout = Cvar_Get("sys_nostdout", "0", CVAR_NONE, "None");
	if (COM_CheckParm("-nostdout"))
		Cvar_Set(sys_nostdout, "1");
}

C_LINKAGE int SDL_main(int c, char **v)
{

	double		time, oldtime, newtime;
	int j;

	static	char	cwd[1024];
	int	t;

#ifndef WIN32
        signal(SIGFPE, SIG_IGN);
#endif

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

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

	host_parms.memsize = 16*1024*1024;

	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;
	}

#ifndef WIN32
	noconinput = COM_CheckParm("-noconinput");
	if (!noconinput)
		fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | O_NONBLOCK);
#endif

	Host_Init();

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

		Host_Frame(time);
		oldtime = newtime;
	}

}