/*
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;
}