source: MondoRescue/branches/3.3/mindi-busybox/libbb/in_ether.c@ 3782

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 */

//kbuild:lib-$(CONFIG_ARP) += in_ether.o
//kbuild:lib-$(CONFIG_IFCONFIG) += in_ether.o
//kbuild:lib-$(CONFIG_IFENSLAVE) += in_ether.o

#include "libbb.h"
#include <net/if_arp.h>
#include <net/ethernet.h>

/* Convert Ethernet address from "XX[:]XX[:]XX[:]XX[:]XX[:]XX" to sockaddr.
 * Return nonzero on error.
 */
int FAST_FUNC in_ether(const char *bufp, struct sockaddr *sap)
{
    char *ptr;
    int i, j;
    unsigned char val;
    unsigned char c;

    sap->sa_family = ARPHRD_ETHER;
    ptr = (char *) sap->sa_data;

    i = ETH_ALEN;
    goto first;
    do {
        /* We might get a semicolon here */
        if (*bufp == ':')
            bufp++;
 first:
        j = val = 0;
        do {
            c = *bufp;
            if (((unsigned char)(c - '0')) <= 9) {
                c -= '0';
            } else if ((unsigned char)((c|0x20) - 'a') <= 5) {
                c = (unsigned char)((c|0x20) - 'a') + 10;
            } else {
                if (j && (c == ':' || c == '\0'))
                    /* One-digit byte: __:X:__ */
                    break;
                return -1;
            }
            ++bufp;
            val <<= 4;
            val += c;
            j ^= 1;
        } while (j);

        *ptr++ = val;
    } while (--i);

    /* Error if we aren't at end of string */
    return *bufp;
}