-/* PSPP - computes sample statistics.
+/* PSPP - a program for statistical analysis.
Copyright (C) 2006 Free Software Foundation, Inc.
- Written by Ben Pfaff <blp@gnu.org>.
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
-#include "scratch-reader.h"
+
+#include <data/scratch-reader.h>
+
#include <stdlib.h>
-#include "casefile.h"
-#include "dictionary.h"
-#include "message.h"
-#include "file-handle-def.h"
-#include "scratch-handle.h"
+
+#include <data/case.h>
+#include <data/casereader.h>
+#include <data/dictionary.h>
+#include <data/file-handle-def.h>
+#include <data/scratch-handle.h>
+#include <libpspp/assertion.h>
+#include <libpspp/message.h>
+
#include "xalloc.h"
#include "gettext.h"
#define _(msgid) gettext (msgid)
-/* A reader for a scratch file. */
-struct scratch_reader
- {
- struct file_handle *fh; /* Underlying file handle. */
- struct casereader *casereader; /* Case reader. */
- };
-
/* Opens FH, which must have referent type FH_REF_SCRATCH, and
returns a scratch_reader for it, or a null pointer on
failure. Stores the dictionary for the scratch file into
- *DICT.
-
- If you use an any_reader instead, then your code can be more
- flexible without being any harder to write. */
-struct scratch_reader *
+ *DICT. */
+struct casereader *
scratch_reader_open (struct file_handle *fh, struct dictionary **dict)
{
struct scratch_handle *sh;
- struct scratch_reader *reader;
-
- if (!fh_open (fh, FH_REF_SCRATCH, "scratch file", "rs"))
- return NULL;
-
+
+ /* We don't bother doing fh_lock or fh_ref on the file handle,
+ as there's no advantage in this case, and doing these would
+ require us to keep track of the "struct file_handle" and
+ "struct fh_lock" and undo our work later. */
+ assert (fh_get_referent (fh) == FH_REF_SCRATCH);
+
sh = fh_get_scratch_handle (fh);
- if (sh == NULL)
+ if (sh == NULL || sh->casereader == NULL)
{
msg (SE, _("Scratch file handle %s has not yet been written, "
"using SAVE or another procedure, so it cannot yet "
}
*dict = dict_clone (sh->dictionary);
- reader = xmalloc (sizeof *reader);
- reader->fh = fh;
- reader->casereader = casefile_get_reader (sh->casefile);
- return reader;
-}
-
-/* Reads a case from READER into C.
- Returns true if successful, false on error or at end of file. */
-bool
-scratch_reader_read_case (struct scratch_reader *reader, struct ccase *c)
-{
- return casereader_read (reader->casereader, c);
-}
-
-/* Returns true if an I/O error occurred on READER, false otherwise. */
-bool
-scratch_reader_error (const struct scratch_reader *reader)
-{
- return casefile_error (casereader_get_casefile (reader->casereader));
-}
-
-/* Closes READER. */
-void
-scratch_reader_close (struct scratch_reader *reader)
-{
- fh_close (reader->fh, "scratch file", "rs");
- casereader_destroy (reader->casereader);
- free (reader);
+ return casereader_clone (sh->casereader);
}