Easy way to set each individual bit of data of any size.

bit.c

#include <stdio.h>
#include <stdarg.h>

unsigned int counter(const char *str) {
	unsigned int i = 1;
	
	while (*str) {

		if (*str == ',') i++;
		
		str++;
	}
	
	return i;
}

void BIT(void *dest, unsigned int count, ...) {
	va_list args;
	char bit, *ptr;
	unsigned int i, j;
	
	ptr = (char*)dest;
	ptr[0] = 0;
	
	va_start(args, count);
	
	for (i=0,j=0; i<count; i++) {
		bit = !!va_arg(args, int);
		ptr[j] |= bit << (7 - (i % 8));
		
		if ((i+1) % 8 == 0) ptr[++j] = 0;
	}
	
}

#define BIT(x, ...) BIT(x, counter(#__VA_ARGS__), __VA_ARGS__)

/*///////////////////////////////////
	
		Testing:
		
///////////////////////////////////*/

int main(void) {
	unsigned int c;
	
	BIT(&c, 0, 0, 0, 0, 0, 0, 1, 0,
		0, 0, 0, 0, 0, 0, 0, 1);
	
	printf("%i\n", c);
	
	return 0;
}