#include <stdio.h>
#include <string.h>
 
static unsigned char* read_bits(const unsigned char *src, int offset, int nbits){
	int bit, byte, bit_position;
	unsigned char *s = calloc(1, nbits + 1);
	if(s){
		--nbits;
		for(bit = offset; nbits >= 0; ++bit, --nbits){
			byte = bit / 8;
			bit_position = bit % 8;
			s[nbits] = (src[byte] >> bit_position) & 1;
		}
	}
	return s;
}
 
int main(void) {
	unsigned char *x = "oo";
	printf("%s -> %s\n", x, read_bits(x, 0, 16)); //should print "oo -> 0110111101101111"
	return 0;
}
 
 
 

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