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1 /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/esrg_win_int64.c,v 1.2 2002/05/20 00:24:17 dtashley Exp $
2 **
3 ** This file provides 64-bit native integer operations for Windows platforms.
4 ** By "native" we mean the __int64 data types which are provided by Microsoft
5 ** Visual C++ 6.0.
6 */
7
8 //--------------------------------------------------------------------------------
9 //Copyright 2001 David T. Ashley
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570 //combined work, and to convey the resulting work. The terms of this
571 //License will continue to apply to the part which is the covered work,
572 //but the special requirements of the GNU Affero General Public License,
573 //section 13, concerning interaction through a network will apply to the
574 //combination as such.
575 //
576 // 14. Revised Versions of this License.
577 //
578 // The Free Software Foundation may publish revised and/or new versions of
579 //the GNU General Public License from time to time. Such new versions will
580 //be similar in spirit to the present version, but may differ in detail to
581 //address new problems or concerns.
582 //
583 // Each version is given a distinguishing version number. If the
584 //Program specifies that a certain numbered version of the GNU General
585 //Public License "or any later version" applies to it, you have the
586 //option of following the terms and conditions either of that numbered
587 //version or of any later version published by the Free Software
588 //Foundation. If the Program does not specify a version number of the
589 //GNU General Public License, you may choose any version ever published
590 //by the Free Software Foundation.
591 //
592 // If the Program specifies that a proxy can decide which future
593 //versions of the GNU General Public License can be used, that proxy's
594 //public statement of acceptance of a version permanently authorizes you
595 //to choose that version for the Program.
596 //
597 // Later license versions may give you additional or different
598 //permissions. However, no additional obligations are imposed on any
599 //author or copyright holder as a result of your choosing to follow a
600 //later version.
601 //
602 // 15. Disclaimer of Warranty.
603 //
604 // THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
605 //APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
606 //HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
607 //OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
608 //THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
609 //PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
610 //IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
611 //ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
612 //
613 // 16. Limitation of Liability.
614 //
615 // IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
616 //WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
617 //THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
618 //GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
619 //USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
620 //DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
621 //PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
622 //EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
623 //SUCH DAMAGES.
624 //
625 // 17. Interpretation of Sections 15 and 16.
626 //
627 // If the disclaimer of warranty and limitation of liability provided
628 //above cannot be given local legal effect according to their terms,
629 //reviewing courts shall apply local law that most closely approximates
630 //an absolute waiver of all civil liability in connection with the
631 //Program, unless a warranty or assumption of liability accompanies a
632 //copy of the Program in return for a fee.
633 //
634 // END OF TERMS AND CONDITIONS
635 //
636 // How to Apply These Terms to Your New Programs
637 //
638 // If you develop a new program, and you want it to be of the greatest
639 //possible use to the public, the best way to achieve this is to make it
640 //free software which everyone can redistribute and change under these terms.
641 //
642 // To do so, attach the following notices to the program. It is safest
643 //to attach them to the start of each source file to most effectively
644 //state the exclusion of warranty; and each file should have at least
645 //the "copyright" line and a pointer to where the full notice is found.
646 //
647 // <one line to give the program's name and a brief idea of what it does.>
648 // Copyright (C) <year> <name of author>
649 //
650 // This program is free software: you can redistribute it and/or modify
651 // it under the terms of the GNU General Public License as published by
652 // the Free Software Foundation, either version 3 of the License, or
653 // (at your option) any later version.
654 //
655 // This program is distributed in the hope that it will be useful,
656 // but WITHOUT ANY WARRANTY; without even the implied warranty of
657 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
658 // GNU General Public License for more details.
659 //
660 // You should have received a copy of the GNU General Public License
661 // along with this program. If not, see <http://www.gnu.org/licenses/>.
662 //
663 //Also add information on how to contact you by electronic and paper mail.
664 //
665 // If the program does terminal interaction, make it output a short
666 //notice like this when it starts in an interactive mode:
667 //
668 // <program> Copyright (C) <year> <name of author>
669 // This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
670 // This is free software, and you are welcome to redistribute it
671 // under certain conditions; type `show c' for details.
672 //
673 //The hypothetical commands `show w' and `show c' should show the appropriate
674 //parts of the General Public License. Of course, your program's commands
675 //might be different; for a GUI interface, you would use an "about box".
676 //
677 // You should also get your employer (if you work as a programmer) or school,
678 //if any, to sign a "copyright disclaimer" for the program, if necessary.
679 //For more information on this, and how to apply and follow the GNU GPL, see
680 //<http://www.gnu.org/licenses/>.
681 //
682 // The GNU General Public License does not permit incorporating your program
683 //into proprietary programs. If your program is a subroutine library, you
684 //may consider it more useful to permit linking proprietary applications with
685 //the library. If this is what you want to do, use the GNU Lesser General
686 //Public License instead of this License. But first, please read
687 //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
688 //-------------------------------------------------------------------------------------------------
689 //--------------------------------------------------------------------------------
690 #define MODULE_ESRG_WIN_INT64
691
692 #include <assert.h>
693 #include <string.h>
694
695 #include "charfunc.h"
696 #include "esrg_win_int64.h"
697
698
699 void ESRG_WIN_INT64_StringPlainToUi
700 (
701 const char *s,
702 ESRG_WIN_INT64_UI64 *rv,
703 int *err
704 )
705 {
706 int cval;
707 ESRG_WIN_INT64_UI64 mul_10_max = 1844674407370955161;
708 //The maximum value that can be successfully
709 //multiplied by 10 and still stay within 64 bits.
710 ESRG_WIN_INT64_UI64 result;
711
712 assert(s != NULL);
713 assert(rv != NULL);
714 assert(err != NULL);
715
716 //By default, no error on return.
717 *err = 0;
718
719 //Cover the case of an illegal first character or
720 //a zero length string.
721 cval = CHARFUNC_digit_to_val(*s);
722 if (cval == -1)
723 goto err_return;
724
725 //Cover the case of canonical zero.
726 if (cval == 0)
727 {
728 if (s[1] != 0)
729 {
730 //There is a '0', but not a null char trailing.
731 goto err_return;
732 }
733 else
734 {
735 //Canonical zero.
736 *rv = 0;
737 return;
738 }
739 }
740
741 //If we're here, we have a digit which is not a zero,
742 //and presumably more to follow. Iterate through, applying
743 //the standard formula.
744 //
745 //Overflow can occur under two circumstances. Either we
746 //multiply by 10 and overflow that way, or else we add a
747 //digit and overflow that way.
748 //
749 //The multiply by 10 overflow can be prevented by
750 //knowing the maximum constant that can be multiplied by
751 //10 without overflow (we know this at compile-time).
752 //The add overflow can be detected by the observation that
753 //if the result is less than the digit we added, we
754 //overflowed.
755 result = 0;
756 do
757 {
758 if (result > mul_10_max) //Can't mul--already too large.
759 goto err_return;
760
761 result *= 10;
762
763 result += cval;
764
765 if (result < cval) //Overflow.
766 goto err_return;
767
768 s++;
769 if (*s)
770 {
771 cval = CHARFUNC_digit_to_val(*s);
772 }
773 else
774 {
775 cval = 0;
776 }
777
778 if (cval == -1)
779 goto err_return;
780
781 } while (*s);
782
783
784 *rv = result;
785 return;
786
787 //---------
788 err_return:
789 *rv = 0;
790 *err = 1;
791 return;
792 }
793
794
795 const char *ESRG_WIN_INT64_cvcinfo(void)
796 {
797 return("$Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/esrg_win_int64.c,v 1.2 2002/05/20 00:24:17 dtashley Exp $");
798 }
799
800
801 const char *ESRG_WIN_INT64_hvcinfo(void)
802 {
803 return(ESRG_WIN_INT64_H_VERSION);
804 }
805
806
807 /******************************************************************************
808 ** $Log: esrg_win_int64.c,v $
809 ** Revision 1.2 2002/05/20 00:24:17 dtashley
810 ** Safety checkin.
811 **
812 ** Revision 1.1 2002/05/16 09:36:26 dtashley
813 ** Initial checkin.
814 *******************************************************************************
815 ** End of ESRG_WIN_INT64.C. */

dashley@gmail.com
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