inet/inet_ntoa.c

   1 /* Convert Inet number to ASCII representation.
   2    Copyright (C) 1997-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <arpa/inet.h>
  22
  23 /* The interface of this function is completely stupid, it requires a
  24    static buffer.  We relax this a bit in that we allow one buffer for
  25    each thread.  */
  26 static __thread char buffer[18];
  27
  28
  29 char *
  30 inet_ntoa (struct in_addr in)
  31 {
  32   unsigned char *bytes = (unsigned char *) &in;
  33   __snprintf (buffer, sizeof (buffer), "%d.%d.%d.%d",
  34               bytes[0], bytes[1], bytes[2], bytes[3]);
  35
  36   return buffer;
  37 }