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 <msvcrt/stdlib.h>
12 #include <msvcrt/crttypes.h>
17 unsigned int _rotl( unsigned int value, int shift )
19 int max_bits = sizeof(unsigned int)<<3;
21 return _rotr(value,-shift);
23 if ( shift > max_bits )
24 shift = shift % max_bits;
25 return (value << shift) | (value >> (max_bits-shift));
31 unsigned int _rotr( unsigned int value, int shift )
33 int max_bits = sizeof(unsigned int)<<3;
35 return _rotl(value,-shift);
37 if ( shift > max_bits<<3 )
38 shift = shift % max_bits;
39 return (value >> shift) | (value << (max_bits-shift));
46 unsigned long _lrotl( unsigned long value, int shift )
48 int max_bits = sizeof(unsigned long)<<3;
50 return _lrotr(value,-shift);
52 if ( shift > max_bits )
53 shift = shift % max_bits;
54 return (value << shift) | (value >> (max_bits-shift));
60 unsigned long _lrotr( unsigned long value, int shift )
62 int max_bits = sizeof(unsigned long)<<3;
64 return _lrotl(value,-shift);
66 if ( shift > max_bits )
67 shift = shift % max_bits;
68 return (value >> shift) | (value << (max_bits-shift));