1/* Implementation of the ACCESS intrinsic.
2   Copyright (C) 2006-2020 Free Software Foundation, Inc.
3   Contributed by Fran��ois-Xavier Coudert <coudert@clipper.ens.fr>
4
5This file is part of the GNU Fortran runtime library (libgfortran).
6
7Libgfortran is free software; you can redistribute it and/or
8modify it under the terms of the GNU General Public
9License as published by the Free Software Foundation; either
10version 3 of the License, or (at your option) any later version.
11
12Libgfortran is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17Under Section 7 of GPL version 3, you are granted additional
18permissions described in the GCC Runtime Library Exception, version
193.1, as published by the Free Software Foundation.
20
21You should have received a copy of the GNU General Public License and
22a copy of the GCC Runtime Library Exception along with this program;
23see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24<http://www.gnu.org/licenses/>.  */
25
26#include "libgfortran.h"
27
28#include <errno.h>
29
30#ifdef HAVE_UNISTD_H
31#include <unistd.h>
32#endif
33
34/* INTEGER FUNCTION ACCESS(NAME, MODE)
35   CHARACTER(len=*), INTENT(IN) :: NAME, MODE  */
36
37#ifdef HAVE_ACCESS
38extern int access_func (char *, char *, gfc_charlen_type, gfc_charlen_type);
39export_proto(access_func);
40
41int
42access_func (char *name, char *mode, gfc_charlen_type name_len,
43	     gfc_charlen_type mode_len)
44{
45  gfc_charlen_type i;
46  int m;
47
48  /* Parse the MODE string.  */
49  m = F_OK;
50  for (i = 0; i < mode_len && mode[i]; i++)
51    switch (mode[i])
52      {
53	case ' ':
54	  break;
55
56	case 'r':
57	case 'R':
58	  m |= R_OK;
59	  break;
60
61	case 'w':
62	case 'W':
63	  m |= W_OK;
64	  break;
65
66	case 'x':
67	case 'X':
68	  m |= X_OK;
69	  break;
70
71	default:
72	  return -1;
73	  break;
74      }
75
76  char *path = fc_strdup (name, name_len);
77
78  /* And make the call to access().  */
79  int res = (access (path, m) == 0 ? 0 : errno);
80
81  free (path);
82  return res;
83}
84#endif
85