bits.h

Go to the documentation of this file.

/*
 * 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 COAP_BITS_H_
#define COAP_BITS_H_

#include <stdint.h>

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

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

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

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

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

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

#endif /* COAP_BITS_H_ */