111 lines
2.8 KiB
C
111 lines
2.8 KiB
C
/****************************************************************************
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* libs/libc/net/lib_inetaton.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 <stdint.h>
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#include <arpa/inet.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: inet_aton
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*
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* Description:
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* The inet_aton() function converts the string pointed to by cp, in the
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* standard IPv4 dotted decimal notation, to an integer value suitable for
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* use as an Internet address.
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*
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* Note:
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* inet_aton() returns nonzero if the address is valid, zero if not.
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* Therefore macros OK and ERROR are not used here.
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*
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****************************************************************************/
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int inet_aton(FAR const char *cp, FAR struct in_addr *inp)
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{
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int dots = 0;
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uint32_t num = 0;
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uint32_t addr = 0;
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int c;
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do
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{
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c = *cp;
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switch (c)
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{
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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num = 10 * num + (c - '0');
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break;
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case '.':
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dots++;
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if (dots > 3)
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{
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return 0;
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}
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/* no break */
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case '\0':
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if (num > 255)
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{
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return 0;
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}
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addr = addr << 8 | num;
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num = 0;
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break;
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default:
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return 0;
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}
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}
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while (*cp++);
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/* Normalize it */
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if (dots < 3)
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{
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addr <<= 8 * (3 - dots);
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}
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if (inp)
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{
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inp->s_addr = HTONL(addr);
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}
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return 1;
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}
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