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77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/* Copyright (C) 1996-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <netinet/ether.h>
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#include <netinet/if_ether.h>
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int
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ether_line (const char *line, struct ether_addr *addr, char *hostname)
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{
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for (size_t cnt = 0; cnt < 6; ++cnt)
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{
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unsigned int number;
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char ch;
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ch = _tolower (*line++);
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if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f'))
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return -1;
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number = isdigit (ch) ? (ch - '0') : (ch - 'a' + 10);
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ch = _tolower (*line);
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if ((cnt < 5 && ch != ':') || (cnt == 5 && ch != '\0' && !isspace (ch)))
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{
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++line;
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if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f'))
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return -1;
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number <<= 4;
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number += isdigit (ch) ? (ch - '0') : (ch - 'a' + 10);
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ch = *line;
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if (cnt < 5 && ch != ':')
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return -1;
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}
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/* Store result. */
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addr->ether_addr_octet[cnt] = (unsigned char) number;
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/* Skip ':'. */
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if (ch != '\0')
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++line;
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}
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/* Skip initial whitespace. */
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while (isspace (*line))
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++line;
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if (*line == '#' || *line == '\0')
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/* No hostname. */
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return -1;
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/* The hostname is up to the next non-space character. */
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/* XXX This can cause trouble because the hostname might be too long
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but we have no possibility to check it here. */
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while (*line != '\0' && *line != '#' && !isspace (*line))
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*hostname++ = *line++;
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*hostname = '\0';
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return 0;
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}
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