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1 /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/esrg_int_def.c,v 1.2 2002/07/29 16:53:10 dtashley Exp $
2 **
3 ** A description of the functionality of this module and the public interface
4 ** definition is contained in the associated .H file.
5 */
6
7 //--------------------------------------------------------------------------------
8 //Copyright 2001 David T. Ashley
9 //-------------------------------------------------------------------------------------------------
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682 //into proprietary programs. If your program is a subroutine library, you
683 //may consider it more useful to permit linking proprietary applications with
684 //the library. If this is what you want to do, use the GNU Lesser General
685 //Public License instead of this License. But first, please read
686 //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
687 //-------------------------------------------------------------------------------------------------
688 //--------------------------------------------------------------------------------
689 #define MODULE_ESRG_INT_DEF
690
691 #include <assert.h>
692 #include <string.h>
693
694 #include "esrg_int_def.h"
695
696
697 void ESRG_INT_DEF_Create( ESRG_INT_DEF_INT *arg, int is_signed )
698 {
699 assert(arg != NULL);
700
701 memset(arg, 0, sizeof(ESRG_INT_DEF_INT));
702
703 if (is_signed)
704 {
705 arg->flags = ESRG_INT_DEF_FLAG_IS_SIGNED;
706 }
707 }
708
709
710 void ESRG_INT_DEF_AssignU( ESRG_INT_DEF_INT *arg, unsigned int aval)
711 {
712 assert(arg != NULL);
713
714 //Reset any pending error flags. An assignment starts fresh.
715 arg->flags &= ~(ESRG_INT_DEF_FLAG_NEG_ROLL | ESRG_INT_DEF_FLAG_POS_ROLL | ESRG_INT_DEF_FLAG_NAN);
716
717 arg->limbs[0] = aval;
718 memset(&(arg->limbs[1]), 0, sizeof(arg->limbs[0]) * (ESRG_INT_DEF_NLIMBS-1));
719
720 //The only circumstance under which there is an overflow
721 //is if the value is inherently signed and if the limbs per
722 //int is 1 and the MSB is set.
723 if (arg->flags & ESRG_INT_DEF_FLAG_IS_SIGNED)
724 {
725 if (ESRG_INT_DEF_NLIMBS == 1)
726 {
727 if (aval & (1 << (ESRG_INT_DEF_NATIVE_BITSIZE-1)))
728 {
729 arg->flags |= ESRG_INT_DEF_FLAG_POS_ROLL;
730 }
731 }
732 }
733 }
734
735
736 void ESRG_INT_DEF_AssignS( ESRG_INT_DEF_INT *arg, int aval)
737 {
738 assert(arg != NULL);
739
740 //Reset any pending error flags. An assignment starts fresh.
741 arg->flags &= ~(ESRG_INT_DEF_FLAG_NEG_ROLL | ESRG_INT_DEF_FLAG_POS_ROLL | ESRG_INT_DEF_FLAG_NAN);
742
743 arg->limbs[0] = aval;
744 //Assign the base limb.
745
746 //Deal with the sign extension. If the number is not signed,
747 //don't extend at all. If the number is signed, extend.
748 if (arg->flags & ESRG_INT_DEF_FLAG_IS_SIGNED)
749 {
750 if (aval < 0)
751 memset(&(arg->limbs[1]), -1, sizeof(arg->limbs[0]) * (ESRG_INT_DEF_NLIMBS-1));
752 else
753 memset(&(arg->limbs[1]), 0, sizeof(arg->limbs[0]) * (ESRG_INT_DEF_NLIMBS-1));
754 }
755 else
756 {
757 memset(&(arg->limbs[1]), 0, sizeof(arg->limbs[0]) * (ESRG_INT_DEF_NLIMBS-1));
758 }
759
760 //The only circumstance under which there is an overflow
761 //is if the value is inherently unsigned and if the limbs per
762 //int is 1 and the MSB is set.
763 if (!(arg->flags & ESRG_INT_DEF_FLAG_IS_SIGNED))
764 {
765 if (ESRG_INT_DEF_NLIMBS == 1)
766 {
767 if (aval & (1 << (ESRG_INT_DEF_NATIVE_BITSIZE-1)))
768 {
769 arg->flags |= ESRG_INT_DEF_FLAG_POS_ROLL;
770 }
771 }
772 }
773 }
774
775
776 int ESRG_INT_DEF_Cmp ( ESRG_INT_DEF_INT *a, ESRG_INT_DEF_INT *b )
777 {
778 assert(a != NULL);
779 assert(b != NULL);
780
781 return(0);
782 }
783
784
785 /******************************************************************************
786 ** $Log: esrg_int_def.c,v $
787 ** Revision 1.2 2002/07/29 16:53:10 dtashley
788 ** Safety checkins before being moved to WSU server Kalman.
789 **
790 ** Revision 1.1 2002/07/08 10:47:29 dtashley
791 ** Initial checkin.
792 *******************************************************************************
793 ** End of ESRG_INT_DEF.C. */

dashley@gmail.com
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