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/* Implementation of the HOSTNM intrinsic.

   Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.

   Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>

This file is part of the GNU Fortran 95 runtime library (libgfortran).

Libgfortran 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.

Libgfortran is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

<http://www.gnu.org/licenses/>.  */

#include "libgfortran.h"

#include <errno.h>

#include <string.h>

#ifdef HAVE_UNISTD_H

#include <unistd.h> 

#endif

/* Windows32 version */

#if defined __MINGW32__ && !defined  HAVE_GETHOSTNAME

#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#include <errno.h>

static int

w32_gethostname (char *name, size_t len)

{

  /* We could try the WinSock API gethostname, but that will

     fail if WSAStartup function has has not been called.  We don't

    really need a name that will be understood by socket API, so avoid

    unnecessary dependence on WinSock libraries by using

    GetComputerName instead.  */

  /* On Win9x GetComputerName fails if the input size is less

     than MAX_COMPUTERNAME_LENGTH + 1.  */

  char buffer[MAX_COMPUTERNAME_LENGTH + 1];

  DWORD size =  sizeof (buffer);

  if (!GetComputerName (buffer, &size))

    return -1;

  if ((size = strlen (buffer) + 1)  > len)

    {

      errno = EINVAL;

      /* Truncate as per POSIX spec.  We do not NUL-terminate. */

      size = len;

    }

  memcpy (name, buffer, (size_t) size);

  return 0;

}

#undef gethostname

#define gethostname w32_gethostname

#define  HAVE_GETHOSTNAME 1

#endif

/* SUBROUTINE HOSTNM(NAME, STATUS)

   CHARACTER(len=*), INTENT(OUT) :: NAME

   INTEGER, INTENT(OUT), OPTIONAL :: STATUS  */

#ifdef HAVE_GETHOSTNAME

extern void hostnm_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type);

iexport_proto(hostnm_i4_sub);

void

hostnm_i4_sub (char *name, GFC_INTEGER_4 *status, gfc_charlen_type name_len)

{

  int val, i;

  char *p;

  memset (name, ' ', name_len);

  p = gfc_alloca (name_len + 1);

  val = gethostname (p, name_len);

  if (val == 0)

  {

    i = -1;

    while (i < name_len && p[++i] != '\0')

      name[i] = p[i];

  }

  if (status != NULL)

    *status = (val == 0) ? 0 : errno;

}

iexport(hostnm_i4_sub);

extern void hostnm_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type);

iexport_proto(hostnm_i8_sub);

void

hostnm_i8_sub (char *name, GFC_INTEGER_8 *status, gfc_charlen_type name_len)

{

  int val, i;

  char *p;

  memset (name, ' ', name_len);

  p = gfc_alloca (name_len + 1);

  val = gethostname (p, name_len);

  if (val == 0)

  {

    i = -1;

    while (i < name_len && p[++i] != '\0')

      name[i] = p[i];

  }

  if (status != NULL)

    *status = (val == 0) ? 0 : errno;

}

iexport(hostnm_i8_sub);

extern GFC_INTEGER_4 hostnm (char *, gfc_charlen_type);

export_proto(hostnm);

GFC_INTEGER_4

hostnm (char *name, gfc_charlen_type name_len)

{

  GFC_INTEGER_4 val;

  hostnm_i4_sub (name, &val, name_len);

  return val;

}

#endif