59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
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//==========================================================================;
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//
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// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
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// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
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// PURPOSE.
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//
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// Copyright (c) 1993, 1994 Microsoft Corporation. All Rights Reserved.
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//
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//--------------------------------------------------------------------------;
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//
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// muldiv32.h
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//
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// Description: math routines for 32 bit signed and unsiged numbers.
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//
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// MulDiv32(a,b,c) = (a * b) / c (round down, signed)
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//
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// MulDivRD(a,b,c) = (a * b) / c (round down, unsigned)
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// MulDivRN(a,b,c) = (a * b + c/2) / c (round nearest, unsigned)
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// MulDivRU(a,b,c) = (a * b + c-1) / c (round up, unsigned)
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//
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// Description:
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//
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// History:
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// 9/21/93 cjp [curtisp]
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// 9/23/93 stl [toddla]
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//
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//==========================================================================;
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#ifndef _INC_MULDIV32
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#define _INC_MULDIV32
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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extern LONG FAR PASCAL MulDiv32(LONG a,LONG b,LONG c);
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extern DWORD FAR PASCAL MulDivRN(DWORD a,DWORD b,DWORD c);
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extern DWORD FAR PASCAL MulDivRD(DWORD a,DWORD b,DWORD c);
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extern DWORD FAR PASCAL MulDivRU(DWORD a,DWORD b,DWORD c);
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#if defined(WIN32) || defined(_WIN32)
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// GDI32s MulDiv is the same as MulDivRN
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#define MulDivRN(a,b,c) (DWORD)MulDiv((LONG)(a),(LONG)(b),(LONG)(c))
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#endif
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//
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// some code references these by other names.
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//
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#define muldiv32 MulDivRN
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#define muldivrd32 MulDivRD
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#define muldivru32 MulDivRU
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#ifdef __cplusplus
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}
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#endif
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#endif // _INC_MULDIV32
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