libgfortran/io/close.c

   1 /* Copyright (C) 2002-2014 Free Software Foundation, Inc.
   2    Contributed by Andy Vaught
   3
   4 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   5
   6 Libgfortran is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 Libgfortran is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25 #include "io.h"
  26 #include "unix.h"
  27 #include <limits.h>
  28
  29 typedef enum
  30 { CLOSE_DELETE, CLOSE_KEEP, CLOSE_UNSPECIFIED }
  31 close_status;
  32
  33 static const st_option status_opt[] = {
  34   {"keep", CLOSE_KEEP},
  35   {"delete", CLOSE_DELETE},
  36   {NULL, 0}
  37 };
  38
  39
  40 extern void st_close (st_parameter_close *);
  41 export_proto(st_close);
  42
  43 void
  44 st_close (st_parameter_close *clp)
  45 {
  46   close_status status;
  47   gfc_unit *u;
  48 #if !HAVE_UNLINK_OPEN_FILE
  49   char * path;
  50
  51   path = NULL;
  52 #endif
  53
  54   library_start (&clp->common);
  55
  56   status = !(clp->common.flags & IOPARM_CLOSE_HAS_STATUS) ? CLOSE_UNSPECIFIED :
  57     find_option (&clp->common, clp->status, clp->status_len,
  58                  status_opt, "Bad STATUS parameter in CLOSE statement");
  59
  60   if ((clp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
  61   {
  62     library_end ();
  63     return;
  64   }
  65
  66   u = find_unit (clp->common.unit);
  67   if (u != NULL)
  68     {
  69       if (u->flags.status == STATUS_SCRATCH)
  70         {
  71           if (status == CLOSE_KEEP)
  72             generate_error (&clp->common, LIBERROR_BAD_OPTION,
  73                             "Can't KEEP a scratch file on CLOSE");
  74 #if !HAVE_UNLINK_OPEN_FILE
  75           path = (char *) gfc_alloca (u->file_len + 1);
  76           unpack_filename (path, u->file, u->file_len);
  77 #endif
  78         }
  79       else
  80         {
  81           if (status == CLOSE_DELETE)
  82             {
  83 #if HAVE_UNLINK_OPEN_FILE
  84               delete_file (u);
  85 #else
  86               path = (char *) gfc_alloca (u->file_len + 1);
  87               unpack_filename (path, u->file, u->file_len);
  88 #endif
  89             }
  90         }
  91
  92       close_unit (u);
  93
  94 #if !HAVE_UNLINK_OPEN_FILE
  95       if (path != NULL)
  96         unlink (path);
  97 #endif
  98     }
  99
 100   /* CLOSE on unconnected unit is legal and a no-op: F95 std., 9.3.5. */
 101   library_end ();
 102 }