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/* Implementation of the HOSTNM intrinsic.

   Copyright (C) 2005 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 2 of the License, or (at your option) any later version.

In addition to the permissions in the GNU General Public License, the

Free Software Foundation gives you unlimited permission to link the

compiled version of this file into combinations with other programs,

and to distribute those combinations without any restriction coming

from the use of this file.  (The General Public License restrictions

do apply in other respects; for example, they cover modification of

the file, and distribution when not linked into a combine

executable.)

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.

You should have received a copy of the GNU General Public

License along with libgfortran; see the file COPYING.  If not,

write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

Boston, MA 02110-1301, USA.  */

#include "config.h"

#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