126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
/****************************************************************************
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* libs/libc/net/lib_inetaton
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Juha Niskanen <juha.niskanen@haltian.com>
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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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*
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* 1. 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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* 2. 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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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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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
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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