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1 /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/esrg_int_def.h,v 1.2 2002/07/29 16:53:10 dtashley Exp $
2 **
3 ** This module defines the default integer used by the Tcl/Tk interpreters
4 ** and by other software which does not explicitly deal with arbitrary length
5 ** integers. The hope is that, over time, the Tcl core can be migrated to use
6 ** this functionality. What should happen is that, with the flip of a preprocessor
7 ** switch, the default integer size can be changed.
8 **
9 ** The only real guideline for the size is that it must be at least as large
10 ** as the maximum size of a file.
11 **
12 ** It is felt at the present time that 128-bit integers should be adequate for
13 ** just about everything.
14 */
16 //--------------------------------------------------------------------------------
17 //Copyright 2001 David T. Ashley
18 //-------------------------------------------------------------------------------------------------
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696 //-------------------------------------------------------------------------------------------------
697 //--------------------------------------------------------------------------------
703 #else
704 #define DECMOD_ESRG_INT_DEF extern
705 #endif
707 //Configuration constants.
708 #define ESRG_INT_DEF_BITSIZE (128)
709 //The size, in bits, of each integer. This must be a multiple of the machines
710 //native integer size.
712 //The size, in bits, of the native int of the machine. This may be
713 //any positive integer.
715 //The number of native integers required for each of the default
716 //integers.
718 struct ESRG_INT_DEF_struct
719 {
720 unsigned int flags;
721 //The flags, as defined below.
722 #define ESRG_INT_DEF_FLAG_IS_SIGNED (0x00000001)
723 //Integer is signed. Defined at creation time and not changed.
724 #define ESRG_INT_DEF_FLAG_NEG_ROLL (0x00000002)
725 #define ESRG_INT_DEF_FLAG_POS_ROLL (0x00000004)
726 //TRUE if has rolled over in a negative way or positive way.
727 //Depending on what is being done, this may mean result is invalid.
728 #define ESRG_INT_DEF_FLAG_NAN (0x00000008)
729 //TRUE if the result is not a number. This may be from division by zero,
730 //square root of a negative number, etc.
731 unsigned int limbs[ESRG_INT_DEF_NLIMBS];
732 //The limbs of the integer. These are arranged with the least significant
733 //limb as [0], i.e. things are arranged least-significant component first.
734 //If the integer is signed, it is a concatenated two's complement representation--
735 //same as the ideal, but spread over multiple native ints.
736 };
738 typedef struct ESRG_INT_DEF_struct ESRG_INT_DEF_INT;
740 //Required initialization before doing anything.
741 //Destruction is not required--only initialization before
742 //the first assignment or use.
744 ( ESRG_INT_DEF_INT *arg ,
745 int is_signed);
747 //Assigns a machine native unsigned integer to the value.
749 ( ESRG_INT_DEF_INT *arg ,
750 unsigned int aval);
752 //Assigns a machine native signed integer to the value.
754 ( ESRG_INT_DEF_INT *arg,
755 int aval);
757 //Compares two values to see their relative relationship.
758 //Returned values are -1 if a<b, 0 if a==b, and 1 if a>b.
759 //All cases of signed/unsigned mixes are handled. Only the
760 //bit patterns of the operands are considered--whether they
761 //are the result of rollovers, etc., is not considered.
763 ( ESRG_INT_DEF_INT *a,
764 ESRG_INT_DEF_INT *b );
766 #endif
768 /***************************************************************************
769 ** $Log: esrg_int_def.h,v $
770 ** Revision 1.2 2002/07/29 16:53:10 dtashley
771 ** Safety checkins before being moved to WSU server Kalman.
772 **
773 ** Revision 1.1 2002/07/08 10:47:29 dtashley
774 ** Initial checkin.
775 ****************************************************************************
776 ** End of ESRG_INT_DEF.H. */

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