inet/inet_ntoa.c

   1 /* Convert Inet number to ASCII representation.
   2    Copyright (C) 1997-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library 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 GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <arpa/inet.h>
  23
  24 /* The interface of this function is completely stupid, it requires a
  25    static buffer.  We relax this a bit in that we allow one buffer for
  26    each thread.  */
  27 static __thread char buffer[18];
  28
  29
  30 char *
  31 inet_ntoa (struct in_addr in)
  32 {
  33   unsigned char *bytes = (unsigned char *) &in;
  34   __snprintf (buffer, sizeof (buffer), "%d.%d.%d.%d",
  35               bytes[0], bytes[1], bytes[2], bytes[3]);
  36
  37   return buffer;
  38 }