libgfortran/io/close.c

   1 /* Copyright (C) 2002, 2003, 2005, 2007 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 2, or (at your option)
   9 any later version.
  10
  11 In addition to the permissions in the GNU General Public License, the
  12 Free Software Foundation gives you unlimited permission to link the
  13 compiled version of this file into combinations with other programs,
  14 and to distribute those combinations without any restriction coming
  15 from the use of this file.  (The General Public License restrictions
  16 do apply in other respects; for example, they cover modification of
  17 the file, and distribution when not linked into a combine
  18 executable.)
  19
  20 Libgfortran is distributed in the hope that it will be useful,
  21 but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 GNU General Public License for more details.
  24
  25 You should have received a copy of the GNU General Public License
  26 along with Libgfortran; see the file COPYING.  If not, write to
  27 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  28 Boston, MA 02110-1301, USA.  */
  29
  30 #include "io.h"
  31 #include <limits.h>
  32
  33 typedef enum
  34 { CLOSE_DELETE, CLOSE_KEEP, CLOSE_UNSPECIFIED }
  35 close_status;
  36
  37 static const st_option status_opt[] = {
  38   {"keep", CLOSE_KEEP},
  39   {"delete", CLOSE_DELETE},
  40   {NULL, 0}
  41 };
  42
  43
  44 extern void st_close (st_parameter_close *);
  45 export_proto(st_close);
  46
  47 void
  48 st_close (st_parameter_close *clp)
  49 {
  50   close_status status;
  51   gfc_unit *u;
  52 #if !HAVE_UNLINK_OPEN_FILE
  53   char * path;
  54
  55   path = NULL;
  56 #endif
  57
  58   library_start (&clp->common);
  59
  60   status = !(clp->common.flags & IOPARM_CLOSE_HAS_STATUS) ? CLOSE_UNSPECIFIED :
  61     find_option (&clp->common, clp->status, clp->status_len,
  62                  status_opt, "Bad STATUS parameter in CLOSE statement");
  63
  64   if ((clp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
  65   {
  66     library_end ();
  67     return;
  68   }
  69
  70   u = find_unit (clp->common.unit);
  71   if (u != NULL)
  72     {
  73       if (u->flags.status == STATUS_SCRATCH)
  74         {
  75           if (status == CLOSE_KEEP)
  76             generate_error (&clp->common, ERROR_BAD_OPTION,
  77                             "Can't KEEP a scratch file on CLOSE");
  78 #if !HAVE_UNLINK_OPEN_FILE
  79           path = (char *) gfc_alloca (u->file_len + 1);
  80           unpack_filename (path, u->file, u->file_len);
  81 #endif
  82         }
  83       else
  84         {
  85           if (status == CLOSE_DELETE)
  86             {
  87 #if HAVE_UNLINK_OPEN_FILE
  88               delete_file (u);
  89 #else
  90               path = (char *) gfc_alloca (u->file_len + 1);
  91               unpack_filename (path, u->file, u->file_len);
  92 #endif
  93             }
  94         }
  95
  96       close_unit (u);
  97
  98 #if !HAVE_UNLINK_OPEN_FILE
  99       if (path != NULL)
 100         unlink (path);
 101 #endif
 102     }
 103
 104   /* CLOSE on unconnected unit is legal and a no-op: F95 std., 9.3.5. */
 105   library_end ();
 106 }