/* Emacs style mode select   -*- C++ -*- 
 *-----------------------------------------------------------------------------
 *
 * $Id: i_system.c,v 1.8 2002/01/07 15:45:22 proff_fs Exp $
 *
 *  PrBoom a Doom port merged with LxDoom and LSDLDoom
 *  based on BOOM, a modified and improved DOOM engine
 *  Copyright (C) 1999 by
 *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
 *  Copyright (C) 1999-2000 by
 *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
 *  
 *  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.
 *
 * DESCRIPTION:
 *  Misc system stuff needed by Doom, implemented for Linux.
 *  Mainly timer handling, and ENDOOM/ENDBOOM.
 *
 *-----------------------------------------------------------------------------
 */

static const char
rcsid[] = "$Id: i_system.c,v 1.8 2002/01/07 15:45:22 proff_fs Exp $";

#include <stdio.h>

#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#include <signal.h>
#include "SDL.h"

#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef _MSC_VER
#include <io.h>
#endif
#ifdef DREAMCAST
#include <kos/fs.h>
#else
#include <fcntl.h>
#include <sys/stat.h>
#endif
#include <errno.h>

#include "i_system.h"
#include "doomtype.h"
#include "doomdef.h"
#include "lprintf.h"

#ifdef __GNUG__
#pragma implementation "i_system.h"
#endif
#include "i_system.h"

#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif

void I_uSleep(unsigned long usecs)
{
	  SDL_Delay(usecs/1000);
}

int I_GetTime_RealTime (void)
{
  return (SDL_GetTicks()*TICRATE)/1000;
}

/*
 * I_GetRandomTimeSeed
 *
 * CPhipps - extracted from G_ReloadDefaults because it is O/S based
 */
unsigned long I_GetRandomTimeSeed(void)
{                            
/* This isnt very random */
  return(SDL_GetTicks());
}

/* cphipps - I_GetVersionString
 * Returns a version string in the given buffer 
 */
const char* I_GetVersionString(char* buf, size_t sz)
{
#ifdef HAVE_SNPRINTF
  snprintf(buf,sz,"%s v%s (http://prboom.sourceforge.net/)",PACKAGE,VERSION);
#else
  sprintf(buf,"%s v%s (http://prboom.sourceforge.net/)",PACKAGE,VERSION);
#endif
  return buf;
}

/* cphipps - I_SigString
 * Returns a string describing a signal number
 */
const char* I_SigString(char* buf, size_t sz, int signum)
{
#ifdef SYS_SIGLIST_DECLARED
  if (strlen(sys_siglist[signum]) < sz)
    strcpy(buf,sys_siglist[signum]);
  else
#endif
    sprintf(buf,"signal %d",signum);
  return buf;
}

/* 
 * I_Read
 *
 * cph 2001/11/18 - wrapper for read(2) which handles partial reads and aborts
 * on error.
 */
void I_Read(int fd, void* buf, size_t sz)
{
  while (sz) {
    int rc = read(fd,buf,sz);
    if (rc <= 0) {
      I_Error("I_Read: read failed: %s", rc ? strerror(errno) : "EOF");
    }
    sz -= rc; (unsigned char *)buf += rc;
  }
}

/*
 * I_Filelength
 *
 * Return length of an open file.
 */

int I_Filelength(int handle)
{
#ifndef DREAMCAST
  struct stat   fileinfo;
  if (fstat(handle,&fileinfo) == -1)
    I_Error("I_Filelength: %s",strerror(errno));
  return fileinfo.st_size;
#endif  
}