2 * COPYRIGHT: See COPYING in the top level directory
3 * PROJECT: ReactOS system libraries
4 * FILE: lib/crtdll/stdlib/rot.c
5 * PURPOSE: Performs a bit wise rotation
6 * PROGRAMER: Boudewijn Dekker
11 #include <crtdll/stdlib.h>
13 unsigned int _rotl( unsigned int value, int shift )
15 int max_bits = sizeof(unsigned int)<<3;
17 return _rotr(value,-shift);
19 if ( shift > max_bits )
20 shift = shift % max_bits;
21 return (value << shift) | (value >> (max_bits-shift));
24 unsigned int _rotr( unsigned int value, int shift )
26 int max_bits = sizeof(unsigned int)<<3;
28 return _rotl(value,-shift);
30 if ( shift > max_bits<<3 )
31 shift = shift % max_bits;
32 return (value >> shift) | (value << (max_bits-shift));
36 unsigned long _lrotl( unsigned long value, int shift )
38 int max_bits = sizeof(unsigned long)<<3;
40 return _lrotr(value,-shift);
42 if ( shift > max_bits )
43 shift = shift % max_bits;
44 return (value << shift) | (value >> (max_bits-shift));
47 unsigned long _lrotr( unsigned long value, int shift )
49 int max_bits = sizeof(unsigned long)<<3;
51 return _lrotl(value,-shift);
53 if ( shift > max_bits )
54 shift = shift % max_bits;
55 return (value >> shift) | (value << (max_bits-shift));