1 /* Copyright (C) 1996-2021 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 <string.h> 21 #include <netinet/ether.h> 22 #include <netinet/if_ether.h> 23 24 25 int ether_line(const char * line,struct ether_addr * addr,char * hostname)26ether_line (const char *line, struct ether_addr *addr, char *hostname) 27 { 28 for (size_t cnt = 0; cnt < 6; ++cnt) 29 { 30 unsigned int number; 31 char ch; 32 33 ch = _tolower (*line++); 34 if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f')) 35 return -1; 36 number = isdigit (ch) ? (ch - '0') : (ch - 'a' + 10); 37 38 ch = _tolower (*line); 39 if ((cnt < 5 && ch != ':') || (cnt == 5 && ch != '\0' && !isspace (ch))) 40 { 41 ++line; 42 if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f')) 43 return -1; 44 number <<= 4; 45 number += isdigit (ch) ? (ch - '0') : (ch - 'a' + 10); 46 47 ch = *line; 48 if (cnt < 5 && ch != ':') 49 return -1; 50 } 51 52 /* Store result. */ 53 addr->ether_addr_octet[cnt] = (unsigned char) number; 54 55 /* Skip ':'. */ 56 if (ch != '\0') 57 ++line; 58 } 59 60 /* Skip initial whitespace. */ 61 while (isspace (*line)) 62 ++line; 63 64 if (*line == '#' || *line == '\0') 65 /* No hostname. */ 66 return -1; 67 68 /* The hostname is up to the next non-space character. */ 69 /* XXX This can cause trouble because the hostname might be too long 70 but we have no possibility to check it here. */ 71 while (*line != '\0' && *line != '#' && !isspace (*line)) 72 *hostname++ = *line++; 73 *hostname = '\0'; 74 75 return 0; 76 } 77