bitblock

#include "type.h"

int get_block(int fd, unsigned long blk, char buf[ ])
{
  lseek(fd, (long)blk*BLOCK_SIZE, SEEK_SET);
  read(fd, buf, BLOCK_SIZE);
}

int put_block(int fd, int blk, char buf[ ])
{
  lseek(fd, blk*BLOCK_SIZE, SEEK_SET);
  write(fd, buf, BLOCK_SIZE);
}

int tst_bit(char *buf, int bit)
{
  int i, j;
  i = bit/8; j=bit%8;
  if (buf[i] & (1 << j))
     return 1;
  return 0;
}

int set_bit(char *buf, int bit)
{
  int i, j;
  i = bit/8; j=bit%8;
  buf[i] |= (1 << j);
}

int clr_bit(char *buf, int bit)
{
  int i, j;
  i = bit/8; j=bit%8;
  buf[i] &= ~(1 << j);
}