reactos/sdk/lib/crt/stdlib/rot.c

74 lines
1.5 KiB
C
Raw Normal View History

/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS system libraries
* FILE: lib/sdk/crt/stdlib/rot.c
* PURPOSE: Performs a bitwise rotation
* PROGRAMER: Ariadne
* UPDATE HISTORY:
* 03/04/99: Created
*/
#include <stdlib.h>
#ifdef _MSC_VER
#pragma function(_rotr, _rotl, _rotr, _lrotl, _lrotr)
#endif
unsigned int _rotr( unsigned int value, int shift );
/*
* @implemented
*/
unsigned int _rotl( unsigned int value, int shift )
{
int max_bits = sizeof(unsigned int)<<3;
if ( shift < 0 )
return _rotr(value,-shift);
if ( shift > max_bits )
shift = shift % max_bits;
return (value << shift) | (value >> (max_bits-shift));
}
/*
* @implemented
*/
unsigned int _rotr( unsigned int value, int shift )
{
int max_bits = sizeof(unsigned int)<<3;
if ( shift < 0 )
return _rotl(value,-shift);
2017-10-28 08:28:27 +00:00
if ( shift > max_bits )
shift = shift % max_bits;
return (value >> shift) | (value << (max_bits-shift));
}
/*
* @implemented
*/
unsigned long _lrotl( unsigned long value, int shift )
{
int max_bits = sizeof(unsigned long)<<3;
if ( shift < 0 )
return _lrotr(value,-shift);
if ( shift > max_bits )
shift = shift % max_bits;
return (value << shift) | (value >> (max_bits-shift));
}
/*
* @implemented
*/
unsigned long _lrotr( unsigned long value, int shift )
{
int max_bits = sizeof(unsigned long)<<3;
if ( shift < 0 )
return _lrotl(value,-shift);
if ( shift > max_bits )
shift = shift % max_bits;
return (value >> shift) | (value << (max_bits-shift));
}