132 lines
4.7 KiB
C
132 lines
4.7 KiB
C
/****************************************************************************
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* libs/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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* inet_aton() returns nonzero if the address is valid, zero if not.
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* The address supplied in cp can have one of the following forms:
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*
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* a.b.c.d Each of the four numeric parts specifies a byte of the address;
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* the bytes are assigned in left-to-right order to produce the
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* binary address.
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*
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* a.b.c Parts a and b specify the first two bytes of the binary address.
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* Part c is interpreted as a 16-bit value that defines the
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* rightmost two bytes of the binary address. This notation is
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* suitable for specifying (outmoded) Class B network addresses.
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*
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* a.b Part a specifies the first byte of the binary address. Part b is
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* interpreted as a 24-bit value that defines the rightmost three
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* bytes of the binary address. This notation is suitable for
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* specifying (outmoded) Class A network addresses.
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*
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* a The value a is interpreted as a 32-bit value that is stored
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* directly into the binary address without any byte rearrangement.
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*
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* Returned Value:
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* If input string cannot be recognized as a valid IPv4 number, function
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* returns zero.
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*
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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;
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unsigned int b;
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unsigned int c;
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unsigned int d;
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uint32_t result = 0;
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switch (sscanf(cp, "%u.%u.%u.%u", &a, &b, &c, &d))
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{
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case 1:
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{
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result = a;
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break;
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}
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case 2:
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{
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if ((a < 0x100) && (b < 0x1000000))
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{
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result = (((uint32_t) a) << 24) | b;
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}
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break;
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}
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case 3:
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{
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if ((a < 0x100) && (b < 0x100) && (c < 0x10000))
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{
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result = (((uint32_t) a) << 24) | (((uint32_t) b) << 16) | c;
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}
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break;
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}
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case 4:
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{
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if ((a < 0x100) && (b < 0x100) && (c < 0x100) && (d < 0x100))
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{
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result = (((uint32_t) a) << 24) | (((uint32_t) b) << 16) |
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(((uint32_t) c) << 8) | d;
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}
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break;
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}
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}
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return HTONL(result);
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}
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