1  /* Copyright (C) 1996-2023 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, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <netdb.h>
      20  #include <stdlib.h>
      21  #include <libc-lock.h>
      22  #include <set-freeres.h>
      23  
      24  /* Static buffer for return value.  We allocate it when needed.  */
      25  static char *buffer;
      26  /* All three strings should fit in a block of 1kB size.  */
      27  #define BUFSIZE 1024
      28  
      29  
      30  
      31  static void
      32  allocate (void)
      33  {
      34    buffer = (char *) malloc (BUFSIZE);
      35  }
      36  
      37  int
      38  getnetgrent (char **hostp, char **userp, char **domainp)
      39  {
      40    __libc_once_define (static, once);
      41    __libc_once (once, allocate);
      42  
      43    if (buffer == NULL)
      44      {
      45        __set_errno (ENOMEM);
      46        return -1;
      47      }
      48  
      49    return __getnetgrent_r (hostp, userp, domainp, buffer, BUFSIZE);
      50  }
      51  
      52  weak_alias (buffer, __libc_getnetgrent_freemem_ptr)