LXR busybox/libbb/in

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Utility routines.
   4 */
   5
   6//kbuild:lib-$(CONFIG_ARP) += in_ether.o
   7//kbuild:lib-$(CONFIG_IFCONFIG) += in_ether.o
   8//kbuild:lib-$(CONFIG_IFENSLAVE) += in_ether.o
   9
  10#include "libbb.h"
  11#include <net/if_arp.h>
  12#include <net/ethernet.h>
  13
  14/* Convert Ethernet address from "XX[:]XX[:]XX[:]XX[:]XX[:]XX" to sockaddr.
  15 * Return nonzero on error.
  16 */
  17int FAST_FUNC in_ether(const char *bufp, struct sockaddr *sap)
  18{
  19        char *ptr;
  20        int i, j;
  21        unsigned char val;
  22        unsigned char c;
  23
  24        sap->sa_family = ARPHRD_ETHER;
  25        ptr = (char *) sap->sa_data;
  26
  27        i = ETH_ALEN;
  28        goto first;
  29        do {
  30                /* We might get a semicolon here */
  31                if (*bufp == ':')
  32                        bufp++;
  33 first:
  34                j = val = 0;
  35                do {
  36                        c = *bufp;
  37                        if (((unsigned char)(c - '0')) <= 9) {
  38                                c -= '0';
  39                        } else if ((unsigned char)((c|0x20) - 'a') <= 5) {
  40                                c = (unsigned char)((c|0x20) - 'a') + 10;
  41                        } else {
  42                                if (j && (c == ':' || c == '\0'))
  43                                        /* One-digit byte: __:X:__ */
  44                                        break;
  45                                return -1;
  46                        }
  47                        ++bufp;
  48                        val <<= 4;
  49                        val += c;
  50                        j ^= 1;
  51                } while (j);
  52
  53                *ptr++ = val;
  54        } while (--i);
  55
  56        /* Error if we aren't at end of string */
  57        return *bufp;
  58}
  59