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
  59 EXPORT_SYMBOL(in_aton);