Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers...

[reactos.git] / sdk / lib / crt / stdlib / rot.c

diff --git a/sdk/lib/crt/stdlib/rot.c b/sdk/lib/crt/stdlib/rot.c
new file mode 100644 (file)
index 0000000..825a76d
--- /dev/null
+++ b/sdk/lib/crt/stdlib/rot.c
@@ -0,0 +1,73 @@
+/*
+ * 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);
+
+       if ( shift > max_bits<<3 )
+               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));
+}