1  /* Convert a struct netent object to a string.
       2     Copyright (C) 2016-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <support/format_nss.h>
      20  
      21  #include <arpa/inet.h>
      22  #include <stdio.h>
      23  #include <stdlib.h>
      24  #include <support/support.h>
      25  #include <support/xmemstream.h>
      26  
      27  char *
      28  support_format_netent (struct netent *e)
      29  {
      30    if (e == NULL)
      31      {
      32        char *value = support_format_herrno (h_errno);
      33        char *result = xasprintf ("error: %s\n", value);
      34        free (value);
      35        return result;
      36      }
      37  
      38    struct xmemstream mem;
      39    xopen_memstream (&mem);
      40  
      41    if (e->n_name != NULL)
      42      fprintf (mem.out, "name: %s\n", e->n_name);
      43    for (char **ap = e->n_aliases; *ap != NULL; ++ap)
      44      fprintf (mem.out, "alias: %s\n", *ap);
      45    if (e->n_addrtype != AF_INET)
      46      fprintf (mem.out, "addrtype: %d\n", e->n_addrtype);
      47    /* On alpha, e->n_net is an unsigned long.  */
      48    unsigned int n_net = e->n_net;
      49    fprintf (mem.out, "net: 0x%08x\n", n_net);
      50  
      51    xfclose_memstream (&mem);
      52    return mem.buffer;
      53  }