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/* Implementation of the ACCESS intrinsic.

   Copyright (C) 2006, 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

/* INTEGER FUNCTION ACCESS(NAME, MODE)

   CHARACTER(len=*), INTENT(IN) :: NAME, MODE  */

#ifdef HAVE_ACCESS

extern int access_func (char *, char *, gfc_charlen_type, gfc_charlen_type);

export_proto(access_func);

int

access_func (char *name, char *mode, gfc_charlen_type name_len,

             gfc_charlen_type mode_len)

{

  char * file;

  gfc_charlen_type i;

  int m;

  /* Parse the MODE string.  */

  m = F_OK;

  for (i = 0; i < mode_len && mode[i]; i++)

    switch (mode[i])

      {

        case ' ':

          break;

        case 'r':

        case 'R':

          m |= R_OK;

          break;

        case 'w':

        case 'W':

          m |= W_OK;

          break;

        case 'x':

        case 'X':

          m |= X_OK;

          break;

        default:

          return -1;

          break;

      }

  /* Trim trailing spaces from NAME argument.  */

  while (name_len > 0 && name[name_len - 1] == ' ')

    name_len--;

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

  file = gfc_alloca (name_len + 1);

  memcpy (file, name, name_len);

  file[name_len] = '\0';

  /* And make the call to access().  */

  return (access (file, m) == 0 ? 0 : errno);

}

#endif