#ifndef __DAWN_UTILS_H
#define __DAWN_UTILS_H

#define MAC2STR(a) (a)[0], (a)[1], (a)[2], (a)[3], (a)[4], (a)[5]
#define STR2MAC(a) &(a)[0], &(a)[1], &(a)[2], &(a)[3], &(a)[4], &(a)[5]


static int hex_to_bin(char ch) {
    if ((ch >= '0') && (ch <= '9')) return ch - '0';
    ch = tolower(ch);
    if ((ch >= 'a') && (ch <= 'f')) return ch - 'a' + 10;
    return -1;
}

static int hwaddr_aton(const char *txt, uint8_t *addr) {
    int i;

    for (i = 0; i < ETH_ALEN; i++) {
        int a, b;

        a = hex_to_bin(*txt++);
        if (a < 0) return -1;
        b = hex_to_bin(*txt++);
        if (b < 0) return -1;
        *addr++ = (a << 4) | b;
        if (i < 5 && *txt++ != ':') return -1;
    }

    return 0;
}

#endif