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d614a753 | 1 | /* Copyright (C) 1996-2020 Free Software Foundation, Inc. |
c84142e8 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
c84142e8 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
c84142e8 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
6dbe2837 RM |
18 | |
19 | #include <ctype.h> | |
20 | #include <stdlib.h> | |
21 | #include <netinet/ether.h> | |
22 | #include <netinet/if_ether.h> | |
23 | ||
24 | ||
25 | struct ether_addr * | |
26 | ether_aton_r (const char *asc, struct ether_addr *addr) | |
27 | { | |
28 | size_t cnt; | |
29 | ||
30 | for (cnt = 0; cnt < 6; ++cnt) | |
31 | { | |
32 | unsigned int number; | |
33 | char ch; | |
34 | ||
4caef86c | 35 | ch = _tolower (*asc++); |
6dbe2837 RM |
36 | if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f')) |
37 | return NULL; | |
38 | number = isdigit (ch) ? (ch - '0') : (ch - 'a' + 10); | |
39 | ||
4caef86c | 40 | ch = _tolower (*asc); |
6dbe2837 RM |
41 | if ((cnt < 5 && ch != ':') || (cnt == 5 && ch != '\0' && !isspace (ch))) |
42 | { | |
43 | ++asc; | |
44 | if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f')) | |
45 | return NULL; | |
46 | number <<= 4; | |
5005d3b3 | 47 | number += isdigit (ch) ? (ch - '0') : (ch - 'a' + 10); |
6dbe2837 RM |
48 | |
49 | ch = *asc; | |
50 | if (cnt < 5 && ch != ':') | |
51 | return NULL; | |
52 | } | |
53 | ||
54 | /* Store result. */ | |
55 | addr->ether_addr_octet[cnt] = (unsigned char) number; | |
56 | ||
57 | /* Skip ':'. */ | |
58 | ++asc; | |
59 | } | |
60 | ||
61 | return addr; | |
62 | } | |
a585ba22 | 63 | libc_hidden_def (ether_aton_r) |