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glibc  2.9
getnssent.c
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00001 /* Copyright (C) 2000, 2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <stdlib.h>
00021 #include <netdb.h>
00022 #include "nsswitch.h"
00023 
00024 void *
00025 __nss_getent (getent_r_function func, void **resbuf, char **buffer,
00026              size_t buflen, size_t *buffer_size, int *h_errnop)
00027 {
00028   void *result;
00029 
00030   if (*buffer == NULL)
00031     {
00032       *buffer_size = buflen;
00033       *buffer = malloc (*buffer_size);
00034     }
00035 
00036   while (buffer != NULL
00037         && func (resbuf, *buffer, *buffer_size, &result, h_errnop) == ERANGE
00038         && (h_errnop == NULL || *h_errnop == NETDB_INTERNAL))
00039     {
00040       char *new_buf;
00041       *buffer_size *= 2;
00042       new_buf = realloc (*buffer, *buffer_size);
00043       if (new_buf == NULL)
00044        {
00045          /* We are out of memory.  Free the current buffer so that the
00046             process gets a chance for a normal termination.  */
00047          int save = errno;
00048          free (*buffer);
00049          __set_errno (save);
00050        }
00051       *buffer = new_buf;
00052     }
00053 
00054   if (*buffer == NULL)
00055     result = NULL;
00056 
00057   return result;
00058 }