90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
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/*
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* Copyright (C) 2010 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <net/if_ether.h>
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#include <ctype.h>
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static inline int
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xdigit (char c) {
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unsigned d;
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d = (unsigned)(c-'0');
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if (d < 10) return (int)d;
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d = (unsigned)(c-'a');
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if (d < 6) return (int)(10+d);
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d = (unsigned)(c-'A');
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if (d < 6) return (int)(10+d);
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return -1;
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}
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/*
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* Convert Ethernet address in the standard hex-digits-and-colons to binary
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* representation.
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* Re-entrant version (GNU extensions)
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*/
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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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int i, val0, val1;
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for (i = 0; i < ETHER_ADDR_LEN; ++i) {
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val0 = xdigit(*asc);
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asc++;
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if (val0 < 0)
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return NULL;
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val1 = xdigit(*asc);
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asc++;
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if (val1 < 0)
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return NULL;
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addr->ether_addr_octet[i] = (u_int8_t)((val0 << 4) + val1);
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if (i < ETHER_ADDR_LEN - 1) {
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if (*asc != ':')
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return NULL;
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asc++;
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}
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}
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if (*asc != '\0')
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return NULL;
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return addr;
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}
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/*
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* Convert Ethernet address in the standard hex-digits-and-colons to binary
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* representation.
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*/
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struct ether_addr *
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ether_aton (const char *asc)
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{
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static struct ether_addr addr;
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return ether_aton_r(asc, &addr);
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}
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