Function link_addr

tools/compat/linkaddr.c:54–119

#define LETTER	(4*3)

void
link_addr(const char *addr, struct sockaddr_dl *sdl)
{
	char *cp = sdl->sdl_data;
	char *cplim = sdl->sdl_len + (char *)sdl;
	int byte = 0, state = NAMING, new;

	bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
	sdl->sdl_family = AF_LINK;
	do {
		state &= ~LETTER;
		if ((*addr >= '0') && (*addr <= '9')) {
			new = *addr - '0';
		} else if ((*addr >= 'a') && (*addr <= 'f')) {
			new = *addr - 'a' + 10;
		} else if ((*addr >= 'A') && (*addr <= 'F')) {
			new = *addr - 'A' + 10;
		} else if (*addr == 0) {
			state |= END;
		} else if (state == NAMING &&
			   (((*addr >= 'A') && (*addr <= 'Z')) ||
			   ((*addr >= 'a') && (*addr <= 'z'))))
			state |= LETTER;
		else
			state |= DELIM;
		addr++;
		switch (state /* | INPUT */) {
		case NAMING | DIGIT:
		case NAMING | LETTER:
			*cp++ = addr[-1];
			continue;
		case NAMING | DELIM:
			state = RESET;
			sdl->sdl_nlen = cp - sdl->sdl_data;
			continue;
		case GOTTWO | DIGIT:
			*cp++ = byte;
			/* FALLTHROUGH */
		case RESET | DIGIT:
			state = GOTONE;
			byte = new;
			continue;
		case GOTONE | DIGIT:
			state = GOTTWO;
			byte = new + (byte << 4);
			continue;
		default: /* | DELIM */
			state = RESET;
			*cp++ = byte;
			byte = 0;
			continue;
		case GOTONE | END:
		case GOTTWO | END:
			*cp++ = byte;
			/* FALLTHROUGH */
		case RESET | END:
			break;
		}