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[glibc/history.git] / inet / ether_aton_r.c
blob1e9f15a124c792f0f59d52cd202eb1c7d1c7ab59
1 /* Copyright (C) 1996,97,98,99,2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
5 The GNU C Library is free software; you can redistribute it and/or
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.
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
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <ctype.h>
21 #include <stdlib.h>
22 #include <netinet/ether.h>
23 #include <netinet/if_ether.h>
26 struct ether_addr *
27 ether_aton_r (const char *asc, struct ether_addr *addr)
29 size_t cnt;
31 for (cnt = 0; cnt < 6; ++cnt)
33 unsigned int number;
34 char ch;
36 ch = _tolower (*asc++);
37 if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f'))
38 return NULL;
39 number = isdigit (ch) ? (ch - '0') : (ch - 'a' + 10);
41 ch = _tolower (*asc);
42 if ((cnt < 5 && ch != ':') || (cnt == 5 && ch != '\0' && !isspace (ch)))
44 ++asc;
45 if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f'))
46 return NULL;
47 number <<= 4;
48 number += isdigit (ch) ? (ch - '0') : (ch - 'a' + 10);
50 ch = *asc;
51 if (cnt < 5 && ch != ':')
52 return NULL;
55 /* Store result. */
56 addr->ether_addr_octet[cnt] = (unsigned char) number;
58 /* Skip ':'. */
59 ++asc;
62 return addr;
64 libc_hidden_def (ether_aton_r)