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>
14 unsigned int _rotl( unsigned int value, int shift )
16 int max_bits = sizeof(unsigned int)<<3;
18 return _rotr(value,-shift);
20 if ( shift > max_bits )
21 shift = shift % max_bits;
22 return (value << shift) | (value >> (max_bits-shift));
25 unsigned int _rotr( unsigned int value, int shift )
27 int max_bits = sizeof(unsigned int)<<3;
29 return _rotl(value,-shift);
31 if ( shift > max_bits<<3 )
32 shift = shift % max_bits;
33 return (value >> shift) | (value << (max_bits-shift));
37 unsigned long _lrotl( unsigned long value, int shift )
39 int max_bits = sizeof(unsigned long)<<3;
41 return _lrotr(value,-shift);
43 if ( shift > max_bits )
44 shift = shift % max_bits;
45 return (value << shift) | (value >> (max_bits-shift));
48 unsigned long _lrotr( unsigned long value, int shift )
50 int max_bits = sizeof(unsigned long)<<3;
52 return _lrotl(value,-shift);
54 if ( shift > max_bits )
55 shift = shift % max_bits;
56 return (value >> shift) | (value << (max_bits-shift));