LXR busybox/libbb/in

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