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/* Implementation of the LINK 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

/* SUBROUTINE LINK(PATH1, PATH2, STATUS)

   CHARACTER(len=*), INTENT(IN) :: PATH1, PATH2

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

#ifdef HAVE_LINK

extern void link_i4_sub (char *, char *, GFC_INTEGER_4 *, gfc_charlen_type,

                         gfc_charlen_type);

iexport_proto(link_i4_sub);

void

link_i4_sub (char *path1, char *path2, GFC_INTEGER_4 *status,

             gfc_charlen_type path1_len, gfc_charlen_type path2_len)

{

  int val;

  char *str1, *str2;

  /* Trim trailing spaces from paths.  */

  while (path1_len > 0 && path1[path1_len - 1] == ' ')

    path1_len--;

  while (path2_len > 0 && path2[path2_len - 1] == ' ')

    path2_len--;

  /* Make a null terminated copy of the strings.  */

  str1 = gfc_alloca (path1_len + 1);

  memcpy (str1, path1, path1_len);

  str1[path1_len] = '\0';

  str2 = gfc_alloca (path2_len + 1);

  memcpy (str2, path2, path2_len);

  str2[path2_len] = '\0';

  val = link (str1, str2);

  if (status != NULL)

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

}

iexport(link_i4_sub);

extern void link_i8_sub (char *, char *, GFC_INTEGER_8 *, gfc_charlen_type,

                         gfc_charlen_type);

iexport_proto(link_i8_sub);

void

link_i8_sub (char *path1, char *path2, GFC_INTEGER_8 *status,

             gfc_charlen_type path1_len, gfc_charlen_type path2_len)

{

  int val;

  char *str1, *str2;

  /* Trim trailing spaces from paths.  */

  while (path1_len > 0 && path1[path1_len - 1] == ' ')

    path1_len--;

  while (path2_len > 0 && path2[path2_len - 1] == ' ')

    path2_len--;

  /* Make a null terminated copy of the strings.  */

  str1 = gfc_alloca (path1_len + 1);

  memcpy (str1, path1, path1_len);

  str1[path1_len] = '\0';

  str2 = gfc_alloca (path2_len + 1);

  memcpy (str2, path2, path2_len);

  str2[path2_len] = '\0';

  val = link (str1, str2);

  if (status != NULL)

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

}

iexport(link_i8_sub);

extern GFC_INTEGER_4 link_i4 (char *, char *, gfc_charlen_type,

                              gfc_charlen_type);

export_proto(link_i4);

GFC_INTEGER_4

link_i4 (char *path1, char *path2, gfc_charlen_type path1_len,

         gfc_charlen_type path2_len)

{

  GFC_INTEGER_4 val;

  link_i4_sub (path1, path2, &val, path1_len, path2_len);

  return val;

}

extern GFC_INTEGER_8 link_i8 (char *, char *, gfc_charlen_type,

                              gfc_charlen_type);

export_proto(link_i8);

GFC_INTEGER_8

link_i8 (char *path1, char *path2, gfc_charlen_type path1_len,

         gfc_charlen_type path2_len)

{

  GFC_INTEGER_8 val;

  link_i8_sub (path1, path2, &val, path1_len, path2_len);

  return val;

}

#endif