bits.h

Go to the documentation of this file.

/* BITS.H */

/*
  BITWISE OPERATIONS, Functions to manipulate bits.  Max Luttrell,
  3/17/96
*/
#ifndef _BITS_H_
#define _BITS_H_

#include "bytes.h"


byte getbit(byte b, int n);
/*
 * get value of bit in position n from byte b,
 *   where a byte has positions 12345678
 */

unsigned int getbitint(unsigned int b, int n);
/*
 * get value of bit in position n from unsigned int b,
 *   where an unsigned integer has positions 1234567890123456
 */

void setbit(byte *b, int n, byte v);
/*
 * set value of bit in position n of byte b to be the value v.
 *   a byte has positions 12345678
 *   input: pointer to the byte.  output: none.  side effect: changes
 *   the particular bit in the byte
 */

void setbitint(unsigned int *b, int n, byte v);
/*
 * set value of bit in position n of unsigned int b to be the value v.
 *
 *                       MSB      1   LSB
 *      a byte has positions 1234567890123456
 *  input: pointer to the unsigned int.  output: none.  side effect:
 *      changes the particular bit in the byte
 */

void printbyte(byte b);
/*
 * prints a byte to std output 
 */

void printint(unsigned int b);
/* 
 * prints an unsigned int to std output 
 */

int random_bit(void);
/*
 * returns: either a 1 or a 0.
 *
 * there is approximately an equal chance of each.
 */

void randomize_byte(byte *b);
/*
 * sets the bits inside of byte b to random values
 */

#endif

---