nss/getnssent.c

   1 /* Copyright (C) 2000, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <stdlib.h>
  21 #include <netdb.h>
  22 #include "nsswitch.h"
  23
  24 void *
  25 __nss_getent (getent_r_function func, void **resbuf, char **buffer,
  26               size_t buflen, size_t *buffer_size, int *h_errnop)
  27 {
  28   void *result;
  29
  30   if (*buffer == NULL)
  31     {
  32       *buffer_size = buflen;
  33       *buffer = malloc (*buffer_size);
  34     }
  35
  36   while (buffer != NULL
  37          && func (resbuf, *buffer, *buffer_size, &result, h_errnop) == ERANGE
  38          && (h_errnop == NULL || *h_errnop == NETDB_INTERNAL))
  39     {
  40       char *new_buf;
  41       *buffer_size *= 2;
  42       new_buf = realloc (*buffer, *buffer_size);
  43       if (new_buf == NULL)
  44         {
  45           /* We are out of memory.  Free the current buffer so that the
  46              process gets a chance for a normal termination.  */
  47           int save = errno;
  48           free (*buffer);
  49           __set_errno (save);
  50         }
  51       *buffer = new_buf;
  52     }
  53
  54   if (*buffer == NULL)
  55     result = NULL;
  56
  57   return result;
  58 }