63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/* Copyright (C) 1996-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <ctype.h>
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#include <stdlib.h>
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#include <netinet/ether.h>
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#include <netinet/if_ether.h>
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struct ether_addr *
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ether_aton_r (const char *asc, struct ether_addr *addr)
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{
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size_t cnt;
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for (cnt = 0; cnt < 6; ++cnt)
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{
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unsigned int number;
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char ch;
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ch = _tolower (*asc++);
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if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f'))
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return NULL;
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number = isdigit (ch) ? (ch - '0') : (ch - 'a' + 10);
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ch = _tolower (*asc);
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if ((cnt < 5 && ch != ':') || (cnt == 5 && ch != '\0' && !isspace (ch)))
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{
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++asc;
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if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f'))
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return NULL;
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number <<= 4;
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number += isdigit (ch) ? (ch - '0') : (ch - 'a' + 10);
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ch = *asc;
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if (cnt < 5 && ch != ':')
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return NULL;
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}
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/* Store result. */
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addr->ether_addr_octet[cnt] = (unsigned char) number;
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/* Skip ':'. */
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++asc;
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}
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return addr;
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}
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libc_hidden_def (ether_aton_r)
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