ether_aton.c revision 41e533af4a2720c1dc228ba40b6582ca53085c3a
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 <stdio.h> 30#include <stdlib.h> 31#include <sys/types.h> 32#include <net/if_ether.h> 33#include <ctype.h> 34 35static inline int 36xdigit (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 */ 52struct ether_addr * 53ether_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 */ 84struct ether_addr * 85ether_aton (const char *asc) 86{ 87 static struct ether_addr addr; 88 return ether_aton_r(asc, &addr); 89} 90