/**********************************************
 * bitlib - Bit Manipulation Routines for C02 *
 **********************************************/

/* Duplicate Low Order Nybble in Byte  *
 * Args: char b - Byte to Duplicate    *
 * Returns: char d - Duplicated Byte   */
char dupl();

/* Pack Nybbles into Single Byte *
 * Args: char l - Left Nybble    *
 *       char r - Right Nybble   *
 * Returns: char b - Packed Byte */
char pack();

/* Rotate Byte Left               *
 * Args: char b - Byte to Rotate  *
 *       char n - Number of Bits  *
 * Returns: char r - Rotated Byte */
char rotl();

/* Rotate Byte Right              *
 * Args: char b - Byte to Rotate  *
 *       char n - Number of Bits  *
 * Returns: char r - Rotated Byte */
char rotr();

/* Shift Byte Left                *
 * Args: char b - Byte to Shift   *
 *       char n - Number of Bits  *
 * Returns: char r - Shifted Byte */
char shiftl();

/* Shift Byte Right               *
 * Args: char b - Byte to Shift   *
 *       char n - Number of Bits  *
 * Returns: char r - Shifted Byte */
char shiftr();

/* Swap Nybbles in Byte           *
 * Args: char b - Byte to Swap    *
 * Returns: char d - Swapped Byte */
char swap();

/* Unpack Byte into Separate Nybbles *
 * Args: char b - Byte to Unpack     *
 * Returns: char l - Left Nybble     *
 *          char r - Right Nybble    */
char unpack();