support/support_format_netent.c

   1 /* Convert a struct netent object to a string.
   2    Copyright (C) 2016-2017 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <support/format_nss.h>
  20
  21 #include <arpa/inet.h>
  22 #include <stdio.h>
  23 #include <support/support.h>
  24 #include <support/xmemstream.h>
  25
  26 char *
  27 support_format_netent (struct netent *e)
  28 {
  29   if (e == NULL)
  30     {
  31       char *value = support_format_herrno (h_errno);
  32       char *result = xasprintf ("error: %s\n", value);
  33       free (value);
  34       return result;
  35     }
  36
  37   struct xmemstream mem;
  38   xopen_memstream (&mem);
  39
  40   if (e->n_name != NULL)
  41     fprintf (mem.out, "name: %s\n", e->n_name);
  42   for (char **ap = e->n_aliases; *ap != NULL; ++ap)
  43     fprintf (mem.out, "alias: %s\n", *ap);
  44   if (e->n_addrtype != AF_INET)
  45     fprintf (mem.out, "addrtype: %d\n", e->n_addrtype);
  46   /* On alpha, e->n_net is an unsigned long.  */
  47   unsigned int n_net = e->n_net;
  48   fprintf (mem.out, "net: 0x%08x\n", n_net);
  49
  50   xfclose_memstream (&mem);
  51   return mem.buffer;
  52 }