ReactOS  0.4.15-dev-494-g1d8c567
rot.c
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1 /*
2  * COPYRIGHT: See COPYING in the top level directory
3  * PROJECT: ReactOS system libraries
4  * FILE: lib/sdk/crt/stdlib/rot.c
5  * PURPOSE: Performs a bitwise rotation
6  * PROGRAMER: Ariadne
7  * UPDATE HISTORY:
8  * 03/04/99: Created
9  */
10 
11 #include <stdlib.h>
12 
13 #ifdef __clang__
14 #define _rotl __function_rotl
15 #define _rotr __function_rotr
16 #define _lrotl __function_lrotl
17 #define _lrotr __function_lrotr
18 #elif defined(_MSC_VER)
19 #pragma function(_rotr, _rotl, _rotr, _lrotl, _lrotr)
20 #endif
21 
22 unsigned int _rotr( unsigned int value, int shift );
23 unsigned long _lrotr(unsigned long value, int shift);
24 
25 /*
26  * @implemented
27  */
28 unsigned int _rotl( unsigned int value, int shift )
29 {
30  int max_bits = sizeof(unsigned int)<<3;
31  if ( shift < 0 )
32  return _rotr(value,-shift);
33 
34  if ( shift > max_bits )
35  shift = shift % max_bits;
36  return (value << shift) | (value >> (max_bits-shift));
37 }
38 
39 /*
40  * @implemented
41  */
42 unsigned int _rotr( unsigned int value, int shift )
43 {
44  int max_bits = sizeof(unsigned int)<<3;
45  if ( shift < 0 )
46  return _rotl(value,-shift);
47 
48  if ( shift > max_bits )
49  shift = shift % max_bits;
50  return (value >> shift) | (value << (max_bits-shift));
51 }
52 
53 /*
54  * @implemented
55  */
56 unsigned long _lrotl( unsigned long value, int shift )
57 {
58  int max_bits = sizeof(unsigned long)<<3;
59  if ( shift < 0 )
60  return _lrotr(value,-shift);
61 
62  if ( shift > max_bits )
63  shift = shift % max_bits;
64  return (value << shift) | (value >> (max_bits-shift));
65 }
66 
67 /*
68  * @implemented
69  */
70 unsigned long _lrotr( unsigned long value, int shift )
71 {
72  int max_bits = sizeof(unsigned long)<<3;
73  if ( shift < 0 )
74  return _lrotl(value,-shift);
75 
76  if ( shift > max_bits )
77  shift = shift % max_bits;
78  return (value >> shift) | (value << (max_bits-shift));
79 }
#define shift
Definition: input.c:1756
unsigned int _rotl(unsigned int value, int shift)
Definition: rot.c:28
unsigned long _lrotl(unsigned long value, int shift)
Definition: rot.c:56
unsigned long _lrotr(unsigned long value, int shift)
Definition: rot.c:70
unsigned int _rotr(unsigned int value, int shift)
Definition: rot.c:42
#define long
Definition: qsort.c:33
unsigned int(__cdecl typeof(jpeg_read_scanlines))(struct jpeg_decompress_struct *
Definition: typeof.h:31