bits.h

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/*
 * bits.h -- bit vector manipulation
 *
 * Copyright (C) 2010,2011 Olaf Bergmann <bergmann@tzi.org>
 *
 * This file is part of the CoAP library libcoap. Please see
 * README for terms of use. 
 */

#ifndef _BITS_H_
#define _BITS_H_

#include <sys/types.h>
#include <stdint.h>

inline static int
bits_setb(uint8_t *vec, size_t size, uint8_t bit) {
  if (size <= (bit >> 3))
    return -1;

  *(vec + (bit >> 3)) |= (uint8_t)(1 << (bit & 0x07));
  return 1;
}

inline static int
bits_clrb(uint8_t *vec, size_t size, uint8_t bit) {
  if (size <= (bit >> 3))
    return -1;

  *(vec + (bit >> 3)) &= (uint8_t)(~(1 << (bit & 0x07)));
  return 1;
}

inline static int
bits_getb(const uint8_t *vec, size_t size, uint8_t bit) {
  if (size <= (bit >> 3))
    return -1;

  return (*(vec + (bit >> 3)) & (1 << (bit & 0x07))) != 0;
}

#endif /* _BITS_H_ */