Home | History | Annotate | Line # | Download | only in intrinsics 
      1 /* Implementation of the ACCESS intrinsic.
      2    Copyright (C) 2006-2024 Free Software Foundation, Inc.
      3    Contributed by Franois-Xavier Coudert <coudert (at) clipper.ens.fr>
      4 
      5 This file is part of the GNU Fortran runtime library (libgfortran).
      6 
      7 Libgfortran is free software; you can redistribute it and/or
      8 modify it under the terms of the GNU General Public
      9 License as published by the Free Software Foundation; either
     10 version 3 of the License, or (at your option) any later version.
     11 
     12 Libgfortran is distributed in the hope that it will be useful,
     13 but WITHOUT ANY WARRANTY; without even the implied warranty of
     14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15 GNU General Public License for more details.
     16 
     17 Under Section 7 of GPL version 3, you are granted additional
     18 permissions described in the GCC Runtime Library Exception, version
     19 3.1, as published by the Free Software Foundation.
     20 
     21 You should have received a copy of the GNU General Public License and
     22 a copy of the GCC Runtime Library Exception along with this program;
     23 see 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
     38 extern int access_func (char *, char *, gfc_charlen_type, gfc_charlen_type);
     39 export_proto(access_func);
     40 
     41 int
     42 access_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