/*
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.

*/
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <string.h>
#include <ctype.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <errno.h>

#include "quakedef.h"

int noconinput = 0;
int nostdout = 0;

char *basedir = ".";
char *cachedir = "/tmp";

cvar_t  sys_linerefresh = {"sys_linerefresh","0"};// set for entity display

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

void Sys_DebugNumber(int y, int val)
{
}

/*
void Sys_Printf (char *fmt, ...)
{
  va_list   argptr;
  char    text[1024];
  
  va_start (argptr,fmt);
  vsprintf (text,fmt,argptr);
  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);
    vsprintf (text,fmt,argptr);
    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_Printf (char *fmt, ...)
{
  va_list   argptr;
  char    text[2048];
  unsigned char   *p;

  va_start (argptr,fmt);
  vsprintf (text,fmt,argptr);
  va_end (argptr);

  if (strlen(text) > sizeof(text))
    Sys_Error("memory overwrite in Sys_Printf");

    if (nostdout)
        return;

  for (p = (unsigned char *)text; *p; p++)
    if ((*p > 128 || *p < 32) && *p != 10 && *p != 13 && *p != 9)
      printf("[%02x]", *p);
    else
      putc(*p, stdout);
}

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

void Sys_Init(void)
{
#if id386
  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) & ~FNDELAY);
    
    va_start (argptr,error);
    vsprintf (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);
    vsprintf (string,warning,argptr);
    va_end (argptr);
  fprintf(stderr, "Warning: %s", string);
} 

/*
============
Sys_FileTime

returns -1 if not present
============
*/
int Sys_FileTime (char *path)
{
  struct  stat  buf;
  
  if (stat (path,&buf) == -1)
    return -1;
  
  return buf.st_mtime;
}


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

int Sys_FileOpenRead (char *path, int *handle)
{
  int h;
  struct stat fileinfo;
    
  
  h = open (path, O_RDONLY, 0666);
  *handle = h;
  if (h == -1)
    return -1;
  
  if (fstat (h,&fileinfo) == -1)
    Sys_Error ("Error fstating %s", path);

  return fileinfo.st_size;
}

int Sys_FileOpenWrite (char *path)
{
  int     handle;

  umask (0);
  
  handle = open(path,O_RDWR | O_CREAT | O_TRUNC
  , 0666);

  if (handle == -1)
    Sys_Error ("Error opening %s: %s", path,strerror(errno));

  return handle;
}

int Sys_FileWrite (int handle, void *src, int count)
{
  return write (handle, src, count);
}

void Sys_FileClose (int handle)
{
  close (handle);
}

void Sys_FileSeek (int handle, int position)
{
  lseek (handle, position, SEEK_SET);
}

int Sys_FileRead (int handle, void *dest, int count)
{
    return read (handle, dest, count);
}

void Sys_DebugLog(char *file, char *fmt, ...)
{
    va_list argptr; 
    static char data[1024];
    int fd;
    
    va_start(argptr, fmt);
    vsprintf(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 Sys_EditFile(char *filename)
{

  char cmd[256];
  char *term;
  char *editor;

  term = getenv("TERM");
  if (term && !strcmp(term, "xterm"))
  {
    editor = getenv("VISUAL");
    if (!editor)
      editor = getenv("EDITOR");
    if (!editor)
      editor = getenv("EDIT");
    if (!editor)
      editor = "vi";
    sprintf(cmd, "xterm -e %s %s", editor, filename);
    system(cmd);
  }

}

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;
}

// =======================================================================
// Sleeps for microseconds
// =======================================================================

static volatile int oktogo;

void alarm_handler(int x)
{
  oktogo=1;
}

void Sys_LineRefresh(void)
{
}

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;
}

#if !id386
void Sys_HighFPPrecision (void)
{
}

void Sys_LowFPPrecision (void)
{
}
#endif

int   skipframes;

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

  double    time, oldtime, newtime;
  quakeparms_t parms;
  int j;

//  static char cwd[1024];

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

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

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

  parms.memsize = 16*1024*1024;

  j = COM_CheckParm("-mem");
  if (j)
    parms.memsize = (int) (Q_atof(com_argv[j+1]) * 1024 * 1024);
  parms.membase = malloc (parms.memsize);

  parms.basedir = basedir;
// caching is disabled by default, use -cachedir to enable
//  parms.cachedir = cachedir;

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

  if (COM_CheckParm("-nostdout"))
    nostdout = 1;

  Sys_Init();

    Host_Init(&parms);

    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");

}