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glibc/inet/ether_line.c
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/* Copyright (C) 1996-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <ctype.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <netinet/ether.h> | |
#include <netinet/if_ether.h> | |
int | |
ether_line (const char *line, struct ether_addr *addr, char *hostname) | |
{ | |
for (size_t cnt = 0; cnt < 6; ++cnt) | |
{ | |
unsigned int number; | |
char ch; | |
ch = _tolower (*line++); | |
if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f')) | |
return -1; | |
number = isdigit (ch) ? (ch - '0') : (ch - 'a' + 10); | |
ch = _tolower (*line); | |
if ((cnt < 5 && ch != ':') || (cnt == 5 && ch != '\0' && !isspace (ch))) | |
{ | |
++line; | |
if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f')) | |
return -1; | |
number <<= 4; | |
number += isdigit (ch) ? (ch - '0') : (ch - 'a' + 10); | |
ch = *line; | |
if (cnt < 5 && ch != ':') | |
return -1; | |
} | |
/* Store result. */ | |
addr->ether_addr_octet[cnt] = (unsigned char) number; | |
/* Skip ':'. */ | |
if (ch != '\0') | |
++line; | |
} | |
/* Skip initial whitespace. */ | |
while (isspace (*line)) | |
++line; | |
if (*line == '#' || *line == '\0') | |
/* No hostname. */ | |
return -1; | |
/* The hostname is up to the next non-space character. */ | |
/* XXX This can cause trouble because the hostname might be too long | |
but we have no possibility to check it here. */ | |
while (*line != '\0' && *line != '#' && !isspace (*line)) | |
*hostname++ = *line++; | |
*hostname = '\0'; | |
return 0; | |
} |