libc/socket/inet_ntop.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2008  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *  Copyright (C) 2009  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   5  *
   6  *  This program is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <arpa/inet.h>
  24 #include <sys/socket.h>
  25 #include <netinet/in.h>
  26
  27 const char *inet_ntop (int af, const void *src, char *dst, size_t cnt)
  28 {
  29         if (!src || !dst || !cnt)
  30                 return (char *) 0;
  31
  32         if (af == AF_INET && cnt > 15) {
  33                 unsigned *ip = (unsigned *) src;
  34
  35                 unsigned char a = (unsigned char) *ip;
  36                 unsigned char b = (unsigned char) (*ip >> 8);
  37                 unsigned char c = (unsigned char) (*ip >> 16);
  38                 unsigned char d = (unsigned char) (*ip >> 24);
  39
  40                 sprintf (dst, "%d.%d.%d.%d", a, b, c, d);
  41
  42                 return dst;
  43         }
  44
  45         if (af == AF_INET6 && cnt > 39) {
  46                 unsigned short ip[8];
  47                 memcpy (ip, src, 16);
  48
  49                 sprintf (dst, "%x:%x:%x:%x:%x:%x:%x:%x", htons (ip[0]), htons (ip[1]), htons (ip[2]), htons (ip[3]),
  50                         htons (ip[4]), htons (ip[5]), htons (ip[6]), htons (ip[7]));
  51
  52                 return dst;
  53         }
  54
  55         return (char *) 0;
  56 }
  57