LXR linux-bk/net/ipv4/utils.c

   1/*
   2 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3 *              operating system.  INET is implemented using the  BSD Socket
   4 *              interface as the means of communication with the user level.
   5 *
   6 *              Various kernel-resident INET utility functions; mainly
   7 *              for format conversion and debugging output.
   8 *
   9 * Version:     $Id: utils.c,v 1.8 2000/10/03 07:29:01 anton Exp $
  10 *
  11 * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12 *
  13 * Fixes:
  14 *              Alan Cox        :       verify_area check.
  15 *              Alan Cox        :       removed old debugging.
  16 *              Andi Kleen      :       add net_ratelimit()  
  17 *
  18 *              This program is free software; you can redistribute it and/or
  19 *              modify it under the terms of the GNU General Public License
  20 *              as published by the Free Software Foundation; either version
  21 *              2 of the License, or (at your option) any later version.
  22 */
  23
  24#include <linux/module.h>
  25#include <linux/types.h>
  26#include <asm/byteorder.h>
  27
  28/*
  29 *      Convert an ASCII string to binary IP. 
  30 */
  31 
  32__u32 in_aton(const char *str)
  33{
  34        unsigned long l;
  35        unsigned int val;
  36        int i;
  37
  38        l = 0;
  39        for (i = 0; i < 4; i++) 
  40        {
  41                l <<= 8;
  42                if (*str != '\0') 
  43                {
  44                        val = 0;
  45                        while (*str != '\0' && *str != '.') 
  46                        {
  47                                val *= 10;
  48                                val += *str - '0';
  49                                str++;
  50                        }
  51                        l |= val;
  52                        if (*str != '\0') 
  53                                str++;
  54                }
  55        }
  56        return(htonl(l));
  57}
  58
  59EXPORT_SYMBOL(in_aton);
  60