866bb35d2d
Reference here: https://www.unix.com/man-page/linux/3/ether_aton Signed-off-by: chao.an <anchao@xiaomi.com>
131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/****************************************************************************
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* libs/libc/net/lib_etheraton.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <net/ethernet.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static inline int xdigit(char c)
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{
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unsigned d;
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d = (unsigned)(c - '0');
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if (d < 10)
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{
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return (int)d;
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}
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d = (unsigned)(c - 'a');
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if (d < 6)
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{
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return (int)(10 + d);
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}
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d = (unsigned)(c - 'A');
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if (d < 6)
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{
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return (int)(10 + d);
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}
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return -1;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ether_aton_r
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*
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* Description:
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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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****************************************************************************/
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FAR struct ether_addr *ether_aton_r(FAR const char *asc,
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FAR 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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{
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val0 = xdigit(*asc);
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asc++;
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if (val0 < 0)
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{
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return NULL;
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}
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val1 = xdigit(*asc);
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asc++;
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if (val1 < 0)
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{
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return NULL;
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}
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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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{
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if (*asc != ':')
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{
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return NULL;
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}
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asc++;
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}
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}
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if (*asc != '\0')
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{
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return NULL;
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}
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return addr;
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}
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/****************************************************************************
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* Name: ether_aton
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*
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* Description:
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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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****************************************************************************/
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FAR struct ether_addr *ether_aton(FAR 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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