mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 20:51:11 +00:00
99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/* Convert Inet number to ASCII representation.
|
|
Copyright (C) 1997, 1998, 2000, 2001 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <arpa/inet.h>
|
|
#include <bits/libc-lock.h>
|
|
|
|
/* The interface of this function is completely stupid, it requires a
|
|
static buffer. We relax this a bit in that we allow at least one
|
|
buffer for each thread. */
|
|
|
|
/* This is the key for the thread specific memory. */
|
|
static __libc_key_t key;
|
|
|
|
/* If nonzero the key allocation failed and we should better use a
|
|
static buffer than fail. */
|
|
static char local_buf[18];
|
|
static char *static_buf;
|
|
|
|
/* Destructor for the thread-specific data. */
|
|
static void init (void);
|
|
static void free_key_mem (void *mem);
|
|
|
|
|
|
char *
|
|
inet_ntoa (struct in_addr in)
|
|
{
|
|
__libc_once_define (static, once);
|
|
char *buffer;
|
|
unsigned char *bytes;
|
|
|
|
/* If we have not yet initialized the buffer do it now. */
|
|
__libc_once (once, init);
|
|
|
|
if (static_buf != NULL)
|
|
buffer = static_buf;
|
|
else
|
|
{
|
|
/* We don't use the static buffer and so we have a key. Use it
|
|
to get the thread-specific buffer. */
|
|
buffer = __libc_getspecific (key);
|
|
if (buffer == NULL)
|
|
{
|
|
/* No buffer allocated so far. */
|
|
buffer = malloc (18);
|
|
if (buffer == NULL)
|
|
/* No more memory available. We use the static buffer. */
|
|
buffer = local_buf;
|
|
else
|
|
__libc_setspecific (key, buffer);
|
|
}
|
|
}
|
|
|
|
bytes = (unsigned char *) ∈
|
|
__snprintf (buffer, 18, "%d.%d.%d.%d",
|
|
bytes[0], bytes[1], bytes[2], bytes[3]);
|
|
|
|
return buffer;
|
|
}
|
|
|
|
|
|
/* Initialize buffer. */
|
|
static void
|
|
init (void)
|
|
{
|
|
if (__libc_key_create (&key, free_key_mem))
|
|
/* Creating the key failed. This means something really went
|
|
wrong. In any case use a static buffer which is better than
|
|
nothing. */
|
|
static_buf = local_buf;
|
|
}
|
|
|
|
|
|
/* Free the thread specific data, this is done if a thread terminates. */
|
|
static void
|
|
free_key_mem (void *mem)
|
|
{
|
|
free (mem);
|
|
__libc_setspecific (key, NULL);
|
|
}
|