-/* PSPP - computes sample statistics.
- Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
+/* PSPP - a program for statistical analysis.
+ Copyright (C) 1997-9, 2000, 2007 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 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/>. */
-#if !value_h
-#define value_h 1
+#ifndef DATA_VALUE_H
+#define DATA_VALUE_H 1
-#include <float.h>
#include <libpspp/misc.h>
+#include <stdbool.h>
+#include <stddef.h>
#include "minmax.h"
-#include <config.h>
-
-/* Values. */
/* "Short" strings, which are generally those no more than 8
characters wide, can participate in more operations than
longer strings. */
#define MAX_SHORT_STRING (MAX (ROUND_UP (SIZEOF_DOUBLE, 2), 8))
#define MIN_LONG_STRING (MAX_SHORT_STRING + 1)
-#define MAX_STRING 32767
-
-/* Special values. */
-#define SYSMIS (-DBL_MAX)
-#define LOWEST second_lowest_value
-#define HIGHEST DBL_MAX
/* A numeric or short string value.
Multiple consecutive values represent a long string. */
};
union value *value_dup (const union value *, int width);
+union value *value_create (int width);
+
int compare_values (const union value *, const union value *, int width);
-unsigned hash_value (const union value *, int width);
+unsigned hash_value (const union value *, int width);
+
+int compare_ptr_values (const union value **, const union value **, int width);
+unsigned hash_ptr_value (const union value **, int width);
+
+
+static inline size_t value_cnt_from_width (int width);
+void value_copy (union value *, const union value *, int width);
+void value_set_missing (union value *, int width);
+bool value_is_resizable (const union value *, int old_width, int new_width);
+void value_resize (union value *, int old_width, int new_width);
+
+/* Number of "union value"s required for a variable of the given
+ WIDTH. */
+static inline size_t
+value_cnt_from_width (int width)
+{
+ return width == 0 ? 1 : DIV_RND_UP (width, MAX_SHORT_STRING);
+}
-#endif /* !value.h */
+#endif /* data/value.h */