1 /* Copyright (C) 1996-2022 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #include <ctype.h> 19 #include <stdlib.h> 20 #include <netinet/ether.h> 21 #include <netinet/if_ether.h> 22 23 24 struct ether_addr * ether_aton_r(const char * asc,struct ether_addr * addr)25ether_aton_r (const char *asc, struct ether_addr *addr) 26 { 27 size_t cnt; 28 29 for (cnt = 0; cnt < 6; ++cnt) 30 { 31 unsigned int number; 32 char ch; 33 34 ch = _tolower (*asc++); 35 if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f')) 36 return NULL; 37 number = isdigit (ch) ? (ch - '0') : (ch - 'a' + 10); 38 39 ch = _tolower (*asc); 40 if ((cnt < 5 && ch != ':') || (cnt == 5 && ch != '\0' && !isspace (ch))) 41 { 42 ++asc; 43 if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f')) 44 return NULL; 45 number <<= 4; 46 number += isdigit (ch) ? (ch - '0') : (ch - 'a' + 10); 47 48 ch = *asc; 49 if (cnt < 5 && ch != ':') 50 return NULL; 51 } 52 53 /* Store result. */ 54 addr->ether_addr_octet[cnt] = (unsigned char) number; 55 56 /* Skip ':'. */ 57 ++asc; 58 } 59 60 return addr; 61 } 62 libc_hidden_def (ether_aton_r) 63