/* PSPP - a program for statistical analysis.
- Copyright (C) 2007 Free Software Foundation, Inc.
+ Copyright (C) 2007, 2009 Free Software Foundation, Inc.
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
struct casereader *
casewriter_make_reader (struct casewriter *writer)
{
- struct casereader *reader;
- reader = writer->class->convert_to_reader (writer, writer->aux);
+ struct casereader *reader = writer->class->convert_to_reader (writer, writer->aux);
taint_propagate (writer->taint, casereader_get_taint (reader));
taint_destroy (writer->taint);
free (writer);
void *window_)
{
struct casewindow *window = window_;
- struct casereader *reader;
- reader = casereader_create_random (casewindow_get_value_cnt (window),
- casewindow_get_case_cnt (window),
- &casereader_window_class, window);
+ struct casereader *reader =
+ casereader_create_random (casewindow_get_value_cnt (window),
+ casewindow_get_case_cnt (window),
+ &casereader_window_class, window);
+
taint_propagate (casewindow_get_taint (window),
casereader_get_taint (reader));
return reader;
}
-/* Reads the case at the given 0-based OFFSET from the front of
- WINDOW into C. Returns true if successful, false if
- OFFSET is beyond the end of file or upon I/O error. */
-static bool
+/* Reads and returns the case at the given 0-based OFFSET from
+ the front of WINDOW into C. Returns a null pointer if OFFSET
+ is beyond the end of file or upon I/O error. The caller must
+ call case_unref() on the returned case when it is no longer
+ needed.*/
+static struct ccase *
casereader_window_read (struct casereader *reader UNUSED, void *window_,
- casenumber offset, struct ccase *c)
+ casenumber offset)
{
struct casewindow *window = window_;
if (offset >= casewindow_get_case_cnt (window))
- return false;
- else
- return casewindow_get_case (window, offset, c);
+ return NULL;
+ return casewindow_get_case (window, offset);
}
/* Destroys casewindow reader WINDOW. */