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/* gethostname emulation for SysV and POSIX.1.

   Copyright (C) 1992, 2003, 2006, 2008, 2009 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* David MacKenzie <djm@gnu.ai.mit.edu>
   Windows port by Simon Josefsson <simon@josefsson.org> */

#include <config.h>

#if !((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__)
/* Unix API.  */

/* Specification.  */
#include <unistd.h>

# include <sys/utsname.h>

#include <string.h>

/* Put up to LEN chars of the host name into NAME.
   Null terminate it if the name is shorter than LEN.
   Return 0 if ok, -1 if error.  */

#include <stddef.h>

gethostname (char *name, size_t len)
  struct utsname uts;

  if (uname (&uts) == -1)
    return -1;
  if (len > sizeof (uts.nodename))
      /* More space than we need is available.  */
      name[sizeof (uts.nodename)] = '\0';
      len = sizeof (uts.nodename);
  strncpy (name, uts.nodename, len);
  strcpy (name, "");          /* Hardcode your system name if you want.  */
  return 0;

/* Native Windows API.  Which primitive to choose?
   - gethostname() requires linking with -lws2_32.
   - GetComputerName() does not return the right kind of hostname.
   - GetComputerNameEx(ComputerNameDnsHostname,...) returns the right hostname,
     but it is hard to use portably:
       - It requires defining _WIN32_WINNT to at least 0x0500.
       - With mingw, it also requires
         "#define GetComputerNameEx GetComputerNameExA".
       - With older versions of mingw, none of the declarations are present at
         all, not even of the enum value ComputerNameDnsHostname.
   So we use gethostname().  Linking with -lws2_32 is the least evil.  */

/* Get winsock2.h. */
#include <unistd.h>

/* Get INT_MAX.  */
#include <limits.h>

/* Get set_winsock_errno. */
#include "w32sock.h"

#include "sockets.h"

#undef gethostname

rpl_gethostname (char *name, size_t len)
  int r;

  if (len > INT_MAX)
    len = INT_MAX;
  gl_sockets_startup (SOCKETS_1_1);
  r = gethostname (name, (int) len);
  if (r < 0)
    set_winsock_errno ();

  return r;


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