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 <netinet/ether.h>
21#include <netinet/if_ether.h>
22
23
24struct ether_addr *
25ether_aton_r (const char *asc, struct ether_addr *addr)
26{
27 size_t cnt;
28
29 for (cnt = 0; cnt < 6; ++cnt)
30 {
31 unsigned int number;
32 char ch;
33
34 ch = _tolower (*asc++);
35 if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f'))
36 return NULL;
37 number = isdigit (ch) ? (ch - '0') : (ch - 'a' + 10);
38
39 ch = _tolower (*asc);
40 if ((cnt < 5 && ch != ':') || (cnt == 5 && ch != '\0' && !isspace (ch)))
41 {
42 ++asc;
43 if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f'))
44 return NULL;
45 number <<= 4;
46 number += isdigit (ch) ? (ch - '0') : (ch - 'a' + 10);
47
48 ch = *asc;
49 if (cnt < 5 && ch != ':')
50 return NULL;
51 }
52
53 /* Store result. */
54 addr->ether_addr_octet[cnt] = (unsigned char) number;
55
56 /* Skip ':'. */
57 ++asc;
58 }
59
60 return addr;
61}
62libc_hidden_def (ether_aton_r)
63