/*
 * Time-stamp: <2005-02-15 05:52:09 poser>
 *
 * Copyright (C) 2003 William J. Poser.
 * 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
 * or go to the web page:  http://www.gnu.org/licenses/gpl.txt.
 *
 */

#include "endian.h"

/* Returns a value indicating the endianness of the machine */

int Get_Endianness(void)
{
  unsigned int qp = 0x0f0d0501;	/* By definition, msb = 0f, lsb = 01 */
  char *bp;
  bp = (char *) &qp;		/* bp now points at first byte of 4 byte sequence */

  if((bp[0] == 0x01) &&	/* 1234 pattern */
     (bp[1] == 0x05) &&
     (bp[2] == 0x0d) &&
     (bp[3] == 0x0f)) return(E_LITTLE_ENDIAN);

  if((bp[3] == 0x01) &&	/* 4321 pattern */
     (bp[2] == 0x05) &&
     (bp[1] == 0x0d) &&
     (bp[0] == 0x0f)) return(E_BIG_ENDIAN);

  if((bp[2] == 0x01) &&	/* 3421 pattern */
     (bp[3] == 0x05) &&
     (bp[0] == 0x0d) &&
     (bp[1] == 0x0f)) return(E_PDP_ENDIAN);

  return(E_UNKNOWN_ENDIAN);

}