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

*/
// sys_sun.h -- Sun system driver

#include "quakedef.h"
#include "errno.h"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <fcntl.h>
#include <stddef.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <stdio.h>

qboolean			isDedicated;

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

FILE IO

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

#define MAX_HANDLES             10

typedef struct
{
	FILE	    *hFile;
	char	    *pMap;
	int		    nLen;
	int		    nPos;
} MEMFILE;

MEMFILE		    sys_handles[MAX_HANDLES];

int findhandle (void)
{
	int             i;
	
	for (i = 1 ; i < MAX_HANDLES ; i++)
		if (!sys_handles[i].hFile)
			return i;
	Sys_Error ("out of handles");
	return -1;
}

/*
================
filelength
================
*/
int filelength (FILE *f)
{
	int             pos;
	int             end;
	
	pos = ftell (f);
	fseek (f, 0, SEEK_END);
	end = ftell (f);
	fseek (f, pos, SEEK_SET);
	
	return end;
}

int Sys_FileOpenRead (char *path, int *hndl)
{
	FILE    *f;
	int             i;
	
	i = findhandle ();
	
	f = fopen (path, "rb");
	if (!f)
	{
		*hndl = -1;
		return -1;
	}
	sys_handles[i].hFile = f;
	sys_handles[i].nLen = filelength (f);
	sys_handles[i].nPos = 0;
	sys_handles[i].pMap = mmap (0, sys_handles[i].nLen, PROT_READ, MAP_SHARED, fileno (sys_handles[i].hFile), 0);
	if (!sys_handles[i].pMap || (sys_handles[i].pMap == (char *) - 1))
	{
		printf ("mmap %s failed!", path);
		sys_handles[i].pMap = NULL;
	}
	
	*hndl = i;
	
	return (sys_handles[i].nLen);
}

int Sys_FileOpenWrite (char *path)
{
	FILE    *f;
	int             i;
	
	i = findhandle ();
	
	f = fopen (path, "wb");
	if (!f)
		Sys_Error ("Error opening %s: %s", path, strerror (errno));
	sys_handles[i].hFile = f;
	sys_handles[i].nLen = 0;
	sys_handles[i].nPos = 0;
	sys_handles[i].pMap = NULL;
	
	return i;
}

void Sys_FileClose (int handle)
{
	if (sys_handles[handle].pMap)
		if (munmap (sys_handles[handle].pMap, sys_handles[handle].nLen) != 0)
			printf ("failed to unmap handle %d\n", handle);
			
	fclose (sys_handles[handle].hFile);
	sys_handles[handle].hFile = NULL;
}

void Sys_FileSeek (int handle, int position)
{
	if (sys_handles[handle].pMap)
	{
		sys_handles[handle].nPos = position;
	}
	else fseek (sys_handles[handle].hFile, position, SEEK_SET);
}

int Sys_FileRead (int handle, void *dest, int count)
{
	if (sys_handles[handle].pMap)
	{
		int nPos = sys_handles[handle].nPos;
		if (count < 0) count = 0;
		if (nPos + count > sys_handles[handle].nLen)
			count = sys_handles[handle].nLen - nPos;
		memcpy (dest, &sys_handles[handle].pMap[nPos], count);
		sys_handles[handle].nPos = nPos + count;
		return (count);
	}
	else return fread (dest, 1, count, sys_handles[handle].hFile);
}

int Sys_FileWrite (int handle, void *data, int count)
{
	if (sys_handles[handle].pMap)
		Sys_Error ("Attempted to write to read-only file %d!\n", handle);
	return fwrite (data, 1, count, sys_handles[handle].hFile);
}

int Sys_FileTime (char *path)
{
	FILE    *f;
	
	f = fopen (path, "rb");
	if (f)
	{
		fclose (f);
		return 1;
	}
	
	return -1;
}

void Sys_mkdir (char *path)
{
	mkdir (path, 0777);
}

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

SYSTEM IO

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

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_Error (char *error, ...)
{
	va_list         argptr;
	
	printf ("Sys_Error: ");
	va_start (argptr, error);
	vprintf (error, argptr);
	va_end (argptr);
	printf ("\n");
	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);
}

double Sys_FloatTime (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;
}

char *Sys_ConsoleInput (void)
{
	static char	text[256];
	int		len;
	fd_set	readfds;
	int		ready;
	struct timeval timeout;
	
	timeout.tv_sec = 0;
	timeout.tv_usec = 0;
	FD_ZERO (&readfds);
	FD_SET (0, &readfds);
	ready = select (1, &readfds, 0, 0, &timeout);
	
	if (ready > 0)
	{
		len = read (0, text, sizeof (text));
		if (len >= 1)
		{
			text[len-1] = 0;	// rip off the /n and terminate
			return text;
		}
	}
	
	return 0;
}

void Sys_Sleep (void)
{
}

#if !id386
void Sys_HighFPPrecision (void)
{
}

void Sys_LowFPPrecision (void)
{
}
#endif

void Sys_Init (void)
{
#if id386
	Sys_SetFPCW();
#endif
}

//=============================================================================

int main (int argc, char **argv)
{
	static quakeparms_t    parms;
	float time, oldtime, newtime;
	
	parms.memsize = 16 * 1024 * 1024;
	parms.membase = malloc (parms.memsize);
	parms.basedir = ".";
	parms.cachedir = NULL;
	
	COM_InitArgv (argc, argv);
	
	parms.argc = com_argc;
	parms.argv = com_argv;
	
	printf ("Host_Init\n");
	Host_Init (&parms);
	
	Sys_Init();
	
	// unroll the simulation loop to give the video side a chance to see _vid_default_mode
	Host_Frame (0.1);
	VID_SetDefaultMode();
	
	oldtime = Sys_FloatTime();
	while (1)
	{
		newtime = Sys_FloatTime();
		Host_Frame (newtime - oldtime);
		oldtime = newtime;
	}
	return 0;
}




