conv.h

<B>Digital的Unix操作系统VAX 4.2源码</B>

/*
*	 @(#)conv.h	1.2	(ULTRIX)	1/15/86
*/

/************************************************************************
 *									*
 *			Copyright (c) 1986 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/************************************************************************
*
*			Modification History
*
*	David Metsky		14-Jan-86
*
* 001	Replaced old version with BSD 4.3 version as part of upgrade.
*
*	Based on:	conv.h		5.1		6/7/85
*
*************************************************************************/

#if (HERE != VAX || TARGET != VAX)
	}}}}}	WRONG MACHINE!!!	}}}}}
#endif

/*  The code for converting the types of constants is not  */
/*  portable.  The problems involved in dealing with       */
/*  features such as reserved operands and byte orderings  */
/*  have proven very difficult to deal with in a portable  */
/*  manner.  Because of impending deadlines, I have put    */
/*  off trying to achieve portability.                     */
/*                                                         */
/*                             -Robert Paul Corbett        */
/*                              1983 May 1                 */


#define	BLANK	' '

#define MAXWORD  32767
#define MINWORD -32768

typedef
  struct Dreal
    {
      unsigned fract1: 7;
      unsigned exp: 8;
      unsigned sign: 1;
      unsigned fract2: 16;
      unsigned fract3: 16;
      unsigned fract4: 16;
    }
  dreal;

typedef
  struct Quad
    {
      long word1;
      long word2;
    }
  quad;

typedef
  union RealValue
    {
      double d;
      quad   q;
      dreal  f;
    }
  realvalue;