quakeforge/nq/source/sys_sun.c

/*
	sys_sun.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 "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 {
	VFile      *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 (VFile *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)
{
	VFile      *f;
	int         i;

	i = findhandle ();

	f = Qopen (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)
{
	VFile      *f;
	int         i;

	i = findhandle ();

	f = Qopen (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);

	Qclose (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)
{
	VFile      *f;

	f = Qopen (path, "rb");
	if (f) {
		Qclose (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_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;
}

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)
{
}

#ifndef USE_INTEL_ASM
void
Sys_HighFPPrecision (void)
{
}

void
Sys_LowFPPrecision (void)
{
}

#endif

void
Sys_Init (void)
{
#ifdef USE_INTEL_ASM
	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_DoubleTime ();
	while (1) {
		newtime = Sys_DoubleTime ();
		Host_Frame (newtime - oldtime);
		oldtime = newtime;
	}
	return 0;
}