1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000 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/>. */
21 #include <libpspp/float-format.h>
22 #include <libpspp/misc.h>
28 /* "Short" strings, which are generally those no more than 8
29 characters wide, can participate in more operations than
31 #define MAX_SHORT_STRING (MAX (ROUND_UP (SIZEOF_DOUBLE, 2), 8))
32 #define MIN_LONG_STRING (MAX_SHORT_STRING + 1)
33 #define MAX_STRING 32767
36 #define SYSMIS (-DBL_MAX)
37 #define LOWEST (float_get_lowest ())
38 #define HIGHEST DBL_MAX
40 /* Number of "union value"s required for a variable of the given
43 value_cnt_from_width (int width)
45 return width == 0 ? 1 : DIV_RND_UP (width, MAX_SHORT_STRING);
48 /* A numeric or short string value.
49 Multiple consecutive values represent a long string. */
53 char s[MAX_SHORT_STRING];
56 union value *value_dup (const union value *, int width);
57 union value *value_create (int width);
59 int compare_values (const union value *, const union value *, int width);
60 unsigned hash_value (const union value *, int width);
62 void value_copy (union value *, const union value *, int width);
63 void value_set_missing (union value *, int width);