75 lines
2.9 KiB
C
75 lines
2.9 KiB
C
/****************************************************************************
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* libc/net/lib_inetaddr.c
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*
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* Copyright (C) 2011 Yu Qiang. All rights reserved.
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* Author: Yu Qiang <yuq825@gmail.com>
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*
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* This file is a part of NuttX:
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*
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* Copyright (C) 2011 Gregory Nutt. 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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*
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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 <stdio.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_addr
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*
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* Description:
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* The inet_addr() 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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in_addr_t inet_addr(FAR const char *cp)
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{
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unsigned int a, b, c, d;
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uint32_t result;
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sscanf(cp, "%u.%u.%u.%u", &a, &b, &c, &d);
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result = a << 8;
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result |= b;
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result <<= 8;
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result |= c;
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result <<= 8;
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result |= d;
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return HTONL(result);
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}
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