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glibc  2.9
inet_ntoa.c
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00001 /* Convert Inet number to ASCII representation.
00002    Copyright (C) 1997, 1998, 2000, 2001 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <stdio.h>
00022 #include <stdlib.h>
00023 #include <arpa/inet.h>
00024 
00025 /* The interface of this function is completely stupid, it requires a
00026    static buffer.  We relax this a bit in that we allow one buffer for
00027    each thread.  */
00028 static __thread char buffer[18];
00029 
00030 
00031 char *
00032 inet_ntoa (struct in_addr in)
00033 {
00034   unsigned char *bytes = (unsigned char *) &in;
00035   __snprintf (buffer, sizeof (buffer), "%d.%d.%d.%d",
00036              bytes[0], bytes[1], bytes[2], bytes[3]);
00037 
00038   return buffer;
00039 }