#include <inttypes.h>

uint64_t getmacst(char *);

uint64_t getmacst(char *s)
{
	uint64_t mac = 0;
	char c;

	do {
		uint8_t byte;
		for (byte = 0; (c = *s++) >= '0'; byte |= c - '0') {
			if (c > '9') {
				if ((c &= ~('a' - 'A')) < 'A' || c > 'F')
					break;
				c -= 'A' - 0xA - '0';
			}
			byte <<= 4;
		}
		mac = mac << 8 | byte;
	} while (c);
	return mac;
}