-/* PSPP - computes sample statistics.
- Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
- Written by Ben Pfaff <blp@gnu.org>.
+/* 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>
+/* "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)
-/* Values. */
-
-/* Max length of a short string value, generally 8 chars. */
-#define MAX_SHORT_STRING ((SIZEOF_DOUBLE)>=8 ? ((SIZEOF_DOUBLE)+1)/2*2 : 8)
-#define MIN_LONG_STRING (MAX_SHORT_STRING+1)
-
-/* Max string length. */
-#define MAX_STRING 255
-
-/* FYI: It is a bad situation if sizeof(flt64) < MAX_SHORT_STRING:
- then short string missing values can be truncated in system files
- because there's only room for as many characters as can fit in a
- flt64. */
-#if MAX_SHORT_STRING > SHORT_NAME_LEN
-#error MAX_SHORT_STRING must be less than or equal to SHORT_NAME_LEN.
-#endif
-
-/* Special values. */
-#define SYSMIS (-DBL_MAX)
-#define LOWEST second_lowest_value
-#define HIGHEST DBL_MAX
-
-/* Describes one value, which is either a floating-point number or a
- short string. */
+/* A numeric or short string value.
+ Multiple consecutive values represent a long string. */
union value
{
- /* A numeric value. */
double f;
-
- /* A short-string value. */
char s[MAX_SHORT_STRING];
-
- /* Used by evaluate_expression() to return a string result.
- As currently implemented, it's a pointer to a dynamic
- buffer in the appropriate expression.
-
- Also used by the AGGREGATE procedure in handling string
- values. */
- char *c;
};
-/* Maximum number of `union value's in a single number or string
- value. */
-#define MAX_ELEMS_PER_VALUE (MAX_STRING / sizeof (union value) + 1)
+union value *value_dup (const union value *, int width);
+union value *value_create (int width);
-int compare_values (const union value *a, const union value *b, int width);
+int compare_values (const void *, const void *, const void *var);
+unsigned hash_value (const void *, const void *var);
-unsigned hash_value(const union value *v, int width);
+int compare_values_short (const void *, const void *, const void *var);
+unsigned hash_value_short (const void *, const void *var);
+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);
+int value_compare_3way (const union value *, const union value *, int 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 */
projects / pspp-builds.git / blobdiff