support/support_format_netent.c

   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 }