1/* Copyright (C) 1996-2023 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
25int
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