81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
/*
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* This file is part of the COMROGUE Operating System for Raspberry Pi
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*
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* Copyright (c) 2013, Eric J. Bowersox / Erbosoft Enterprises
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* All rights reserved.
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*
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* This program is free for commercial and non-commercial use as long as the following conditions are
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* adhered to.
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*
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* Copyright in this file remains Eric J. Bowersox and/or Erbosoft, and as such any copyright notices
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* in the code are not to be removed.
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this list of conditions and
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* the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
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* the following disclaimer in the documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* "Raspberry Pi" is a trademark of the Raspberry Pi Foundation.
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*/
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#include <comrogue/types.h>
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#include <comrogue/intlib.h>
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#include "quad.h"
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/*---------------------------
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* Integer library functions
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*---------------------------
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*/
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/* Flags used internally to IntLDiv. */
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#define FLIP_QUOTIENT 0x00000001
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#define FLIP_REMAINDER 0x00000002
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/*
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* Divides two 64-bit integers and returns a quotient and a remainder in a structure.
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*
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* Parameters:
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* - pResult = Pointer to an LDIV structure to contain the quotient and remainder.
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* - num = The numerator (dividend) for the division.
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* - demom = The demoninator (divisor) for the division.
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*
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* Returns:
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* Standard SUCCEEDED/FAILED HRESULT.
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*/
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HRESULT IntLDiv(PLDIV pResult, INT64 num, INT64 denom)
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{
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UINT32 mode = 0;
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if (denom == 0)
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{
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pResult->quot = pResult->rem = 0;
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return E_INVALIDARG;
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}
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if (denom < 0)
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{
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mode ^= FLIP_QUOTIENT;
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denom = -denom;
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}
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if (num < 0)
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{
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mode ^= (FLIP_QUOTIENT|FLIP_REMAINDER);
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num = -num;
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}
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pResult->quot = __qdivrem(num, denom, (PUINT64)(&(pResult->rem)));
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if (mode & FLIP_QUOTIENT)
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pResult->quot = -(pResult->quot);
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if (mode & FLIP_REMAINDER)
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pResult->rem = -(pResult->rem);
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return S_OK;
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}
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