60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <assert.h>
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#include <errno.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include "nsswitch.h"
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/* We avoid using a too large buffer in case the user is accumulating the
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results and there is lots of unused space in the allocated buffer. */
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#define BUFLEN 512
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struct hostent *
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getipnodebyaddr (const char *addr, size_t len, int type, int *error_num)
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{
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size_t buffer_size;
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char *buffer;
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struct hostent *result;
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buffer_size = BUFLEN;
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buffer = malloc (buffer_size);
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while (buffer != NULL
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&& __gethostbyaddr_r (addr, len, type, (struct hostent *) buffer,
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(char *) ((struct hostent *) buffer + 1),
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buffer_size - sizeof (struct hostent),
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&result, error_num) == ERANGE
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&& *error_num == NETDB_INTERNAL)
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{
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buffer_size += BUFLEN;
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buffer = realloc (buffer, buffer_size);
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if (buffer == NULL)
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{
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*error_num = TRY_AGAIN;
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assert (result == NULL);
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return NULL;
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}
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}
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return buffer == NULL ? NULL : result;
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}
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