bit to string, string to bit serialization.

binarytest.c

#include <stdio.h>

void right_shift_bit(char *c, int last_bit) {
	if (last_bit)
		*c = (*c >> 1) | 0b10000000;
	else
		*c = (*c >> 1) & 0b01111111;
}

int get_bit(char c, int bit_index) {
	return c >> bit_index & 0b00000001;
}

int main(int ac, char** av) {
	char dst[5] = "XXXX";
	char src[5] = "ABCD";
  int byte_index = 0;
	while (src[byte_index]) {
        int bit_index = 0;
        while (bit_index < 8) {
            int bit = get_bit(src[byte_index], bit_index);
            right_shift_bit(dst + byte_index, bit);
            printf("(%d) %d - %d \n", bit_index, dst[byte_index], bit);
            bit_index++;
        }
        printf(":");
        byte_index++;
    }
	printf("dst = %s\n", dst);
	return 0;
}