libc/socket/inet_ntop.c

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