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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <net/ethernet.h>
     30 
     31 #include <ctype.h>
     32 #include <stdio.h>
     33 #include <stdlib.h>
     34 
     35 static inline int
     36 xdigit (char c) {
     37     unsigned d;
     38     d = (unsigned)(c-'0');
     39     if (d < 10) return (int)d;
     40     d = (unsigned)(c-'a');
     41     if (d < 6) return (int)(10+d);
     42     d = (unsigned)(c-'A');
     43     if (d < 6) return (int)(10+d);
     44     return -1;
     45 }
     46 
     47 /*
     48  * Convert Ethernet address in the standard hex-digits-and-colons to binary
     49  * representation.
     50  * Re-entrant version (GNU extensions)
     51  */
     52 struct ether_addr *
     53 ether_aton_r (const char *asc, struct ether_addr * addr)
     54 {
     55     int i, val0, val1;
     56     for (i = 0; i < ETHER_ADDR_LEN; ++i) {
     57         val0 = xdigit(*asc);
     58         asc++;
     59         if (val0 < 0)
     60             return NULL;
     61 
     62         val1 = xdigit(*asc);
     63         asc++;
     64         if (val1 < 0)
     65             return NULL;
     66 
     67         addr->ether_addr_octet[i] = (u_int8_t)((val0 << 4) + val1);
     68 
     69         if (i < ETHER_ADDR_LEN - 1) {
     70             if (*asc != ':')
     71                 return NULL;
     72             asc++;
     73         }
     74     }
     75     if (*asc != '\0')
     76         return NULL;
     77     return addr;
     78 }
     79 
     80 /*
     81  * Convert Ethernet address in the standard hex-digits-and-colons to binary
     82  * representation.
     83  */
     84 struct ether_addr *
     85 ether_aton (const char *asc)
     86 {
     87     static struct ether_addr addr;
     88     return ether_aton_r(asc, &addr);
     89 }
     90