94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
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/***
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*rotl.c - rotate an unsigned integer left
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*
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* Copyright (c) 1989-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines _rotl() - performs a rotate left on an unsigned integer.
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*
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*Revision History:
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* 06-02-89 PHG Module created
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* 11-03-89 JCR Added _lrotl
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* 03-15-90 GJF Made calling type _CALLTYPE1, added #include
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* <cruntime.h> and fixed the copyright. Also, cleaned
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* up the formatting a bit.
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* 10-04-90 GJF New-style function declarators.
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* 04-01-91 SRW Enable #pragma function for i386 _WIN32_ builds too.
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* 09-02-92 GJF Don't build for POSIX.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* No _CRTIMP for CRT DLL model due to intrinsic
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* 12-03-93 GJF Turn on #pragma function for all MS front-ends (esp.,
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* Alpha compiler).
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* 01-04-01 GB Rewrote rotl functions and added __int64 version.
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*
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*******************************************************************************/
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#ifndef _POSIX_
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#include <cruntime.h>
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#include <stdlib.h>
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#include <limits.h>
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#ifdef _MSC_VER
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#pragma function(_lrotl,_rotl, _rotl64)
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#endif
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#if UINT_MAX != 0xffffffff /*IFSTRIP=IGN*/
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#error This module assumes 32-bit integers
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#endif
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#if UINT_MAX != ULONG_MAX /*IFSTRIP=IGN*/
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#error This module assumes sizeof(int) == sizeof(long)
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#endif
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/***
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*unsigned _rotl(val, shift) - int rotate left
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*
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*Purpose:
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* Performs a rotate left on an unsigned integer.
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*
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* [Note: The _lrotl entry is based on the assumption
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* that sizeof(int) == sizeof(long).]
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*Entry:
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* unsigned val: value to rotate
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* int shift: number of bits to shift by
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*
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*Exit:
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* returns rotated value
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*
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*Exceptions:
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* None.
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*
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*******************************************************************************/
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unsigned long __cdecl _lrotl (
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unsigned long val,
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int shift
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)
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{
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shift &= 0x1f;
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val = (val>>(0x20 - shift)) | (val << shift);
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return val;
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}
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unsigned __cdecl _rotl (
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unsigned val,
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int shift
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)
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{
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shift &= 0x1f;
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val = (val>>(0x20 - shift)) | (val << shift);
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return val;
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}
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unsigned __int64 __cdecl _rotl64 (
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unsigned __int64 val,
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int shift
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)
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{
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shift &= 0x3f;
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val = (val>>(0x40 - shift)) | (val << shift);
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return val;
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}
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#endif
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