/[dtapublic]/projs/trunk/shared_source/c_datd/esrg_int_def.h
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Fri Oct 14 01:50:00 2016 UTC (7 years, 4 months ago) by dashley
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Move shared source code to commonize.
1 dashley 25 /* $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     */
15    
16     //--------------------------------------------------------------------------------
17     //Copyright 2001 David T. Ashley
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696     //-------------------------------------------------------------------------------------------------
697     //--------------------------------------------------------------------------------
698     #ifndef ESRG_INT_DEF_H_INCLUDED
699     #define ESRG_INT_DEF_H_INCLUDED
700    
701     #ifdef MODULE_ESRG_INT_DEF
702     #define DECMOD_ESRG_INT_DEF
703     #else
704     #define DECMOD_ESRG_INT_DEF extern
705     #endif
706    
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.
711     #define ESRG_INT_DEF_NATIVE_BITSIZE (32)
712     //The size, in bits, of the native int of the machine. This may be
713     //any positive integer.
714     #define ESRG_INT_DEF_NLIMBS (ESRG_INT_DEF_BITSIZE/ESRG_INT_DEF_NATIVE_BITSIZE)
715     //The number of native integers required for each of the default
716     //integers.
717    
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     };
737    
738     typedef struct ESRG_INT_DEF_struct ESRG_INT_DEF_INT;
739    
740     //Required initialization before doing anything.
741     //Destruction is not required--only initialization before
742     //the first assignment or use.
743     DECMOD_ESRG_INT_DEF void ESRG_INT_DEF_Create
744     ( ESRG_INT_DEF_INT *arg ,
745     int is_signed);
746    
747     //Assigns a machine native unsigned integer to the value.
748     DECMOD_ESRG_INT_DEF void ESRG_INT_DEF_AssignU
749     ( ESRG_INT_DEF_INT *arg ,
750     unsigned int aval);
751    
752     //Assigns a machine native signed integer to the value.
753     DECMOD_ESRG_INT_DEF void ESRG_INT_DEF_AssignS
754     ( ESRG_INT_DEF_INT *arg,
755     int aval);
756    
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.
762     DECMOD_ESRG_INT_DEF int ESRG_INT_DEF_Cmp
763     ( ESRG_INT_DEF_INT *a,
764     ESRG_INT_DEF_INT *b );
765    
766     #endif
767    
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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