/* PSPP - computes sample statistics.
Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
- Written by Ben Pfaff <blp@gnu.org>.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
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 (const union value *a, const union value *b, int width)
{
return (width == 0
? (a->f < b->f ? -1 : a->f > b->f)
/* Create a hash of V, which has the given WIDTH.
Only the short string portion of a longer string is hashed. */
-unsigned
+unsigned
hash_value (const union value *v, int width)
{
return (width == 0
? hsh_hash_double (v->f)
: hsh_hash_bytes (v->s, MIN (MAX_SHORT_STRING, width)));
}
+
+/* Copies SRC to DST, given that they both contain data of the
+ given WIDTH. */
+void
+value_copy (union value *dst, const union value *src, int width)
+{
+ if (width == 0)
+ dst->f = src->f;
+ else
+ memcpy (dst->s, src->s, width);
+}
+
+/* Sets V to the system-missing value for data of the given
+ WIDTH. */
+void
+value_set_missing (union value *v, int width)
+{
+ if (width == 0)
+ v->f = SYSMIS;
+ else
+ memset (v->s, ' ', width);
+}