-/* PSPP - computes sample statistics.
- Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
+/* PSPP - a program for statistical analysis.
+ Copyright (C) 1997-9, 2000, 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 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 "value.h"
+#include <data/value.h>
+#include <data/val-type.h>
#include <libpspp/hash.h>
#include <libpspp/str.h>
+#include "variable.h"
#include "xalloc.h"
return xmemdup (val, MAX (width, sizeof *val));
}
+
+/* Create a value of specified width.
+ The caller is responsible for freeing the returned value. */
+union value *
+value_create (int width)
+{
+ return xnmalloc (value_cnt_from_width (width), sizeof (union value));
+}
+
+
/* Compares A and B, which both have the given WIDTH, and returns
a strcmp()-type result.
Only the short string portion of longer strings are
compared. */
int
-compare_values (const union value *a, const union value *b, int width)
+compare_values_short (const void *a_, const void *b_, const void *var_)
{
- return (width == 0
- ? (a->f < b->f ? -1 : a->f > b->f)
- : memcmp (a->s, b->s, MIN (MAX_SHORT_STRING, width)));
+ const union value *a = a_;
+ const union value *b = b_;
+ const struct variable *var = var_;
+ int width = var_get_width (var);
+ return value_compare_3way (a, b, MIN (width, MAX_SHORT_STRING));
}
+
/* Create a hash of V, which has the given WIDTH.
Only the short string portion of a longer string is hashed. */
unsigned
-hash_value (const union value *v, int width)
+hash_value_short (const void *v_, const void *var_)
{
- return (width == 0
- ? hsh_hash_double (v->f)
- : hsh_hash_bytes (v->s, MIN (MAX_SHORT_STRING, width)));
+ const union value *v = v_;
+ const struct variable *var = var_;
+ int width = var_get_width (var);
+ return width == 0 ? hash_double (v->f, 0) : hash_bytes (v->s, width, 0);
}
+
/* Copies SRC to DST, given that they both contain data of the
given WIDTH. */
void
else
memset (v->s, ' ', width);
}
+
+/* Tests whether VALUE may be resized from OLD_WIDTH to
+ NEW_WIDTH, using the following rules that match those for
+ resizing missing values and value labels. First, OLD_WIDTH
+ and NEW_WIDTH must be both numeric or both string. Second, if
+ NEW_WIDTH is less than OLD_WIDTH, then the bytes that would be
+ trimmed off the right end of VALUE must be all spaces. */
+bool
+value_is_resizable (const union value *value, int old_width, int new_width)
+{
+ int i;
+
+ if (val_type_from_width (old_width) != val_type_from_width (new_width))
+ return false;
+ for (i = new_width; i < old_width; i++)
+ if (value->s[i] != ' ')
+ return false;
+ return true;
+}
+
+/* Resizes VALUE from OLD_WIDTH to NEW_WIDTH. The arguments must
+ satisfy the rules specified above for value_is_resizable. */
+void
+value_resize (union value *value, int old_width, int new_width)
+{
+ assert (value_is_resizable (value, old_width, new_width));
+ if (new_width > old_width)
+ memset (&value->s[old_width], ' ', new_width - old_width);
+}
+
+/* Compares A and B, which both have the given WIDTH, and returns
+ a strcmp()-type result. */
+int
+value_compare_3way (const union value *a, const union value *b, int width)
+{
+ return (width == 0
+ ? (a->f < b->f ? -1 : a->f > b->f)
+ : memcmp (a->s, b->s, width));
+}