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[glibc/history.git] / inet / ether_line.c
blob21a4c556792b3fc5d5f2265d3d77fbe9bb63ac88
1 /* Copyright (C) 1996,1999,2002,2007 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #include <ctype.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <netinet/ether.h>
23 #include <netinet/if_ether.h>
26 int
27 ether_line (const char *line, struct ether_addr *addr, char *hostname)
29 for (size_t cnt = 0; cnt < 6; ++cnt)
31 unsigned int number;
32 char ch;
34 ch = _tolower (*line++);
35 if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f'))
36 return -1;
37 number = isdigit (ch) ? (ch - '0') : (ch - 'a' + 10);
39 ch = _tolower (*line);
40 if ((cnt < 5 && ch != ':') || (cnt == 5 && ch != '\0' && !isspace (ch)))
42 ++line;
43 if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f'))
44 return -1;
45 number <<= 4;
46 number += isdigit (ch) ? (ch - '0') : (ch - 'a' + 10);
48 ch = *line;
49 if (cnt < 5 && ch != ':')
50 return -1;
53 /* Store result. */
54 addr->ether_addr_octet[cnt] = (unsigned char) number;
56 /* Skip ':'. */
57 if (ch != '\0')
58 ++line;
61 /* Skip initial whitespace. */
62 while (isspace (*line))
63 ++line;
65 if (*line == '#' || *line == '\0')
66 /* No hostname. */
67 return -1;
69 /* The hostname is up to the next non-space character. */
70 /* XXX This can cause trouble because the hostname might be too long
71 but we have no possibility to check it here. */
72 while (*line != '\0' && *line != '#' && !isspace (*line))
73 *hostname++ = *line++;
74 *hostname = '\0';
76 return 0;