1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 2006 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 #include <data/scratch-reader.h>
23 #include <data/case.h>
24 #include <data/casereader.h>
25 #include <data/dictionary.h>
26 #include <data/file-handle-def.h>
27 #include <data/scratch-handle.h>
28 #include <libpspp/assertion.h>
29 #include <libpspp/message.h>
34 #define _(msgid) gettext (msgid)
36 /* Opens FH, which must have referent type FH_REF_SCRATCH, and
37 returns a scratch_reader for it, or a null pointer on
38 failure. Stores the dictionary for the scratch file into
41 scratch_reader_open (struct file_handle *fh, struct dictionary **dict)
43 struct scratch_handle *sh;
45 /* We don't bother doing fh_lock or fh_ref on the file handle,
46 as there's no advantage in this case, and doing these would
47 require us to keep track of the "struct file_handle" and
48 "struct fh_lock" and undo our work later. */
49 assert (fh_get_referent (fh) == FH_REF_SCRATCH);
51 sh = fh_get_scratch_handle (fh);
52 if (sh == NULL || sh->casereader == NULL)
54 msg (SE, _("Scratch file handle %s has not yet been written, "
55 "using SAVE or another procedure, so it cannot yet "
56 "be used for reading."),
61 *dict = dict_clone (sh->dictionary);
62 return casereader_clone (sh->casereader);