Patch #5886.

(value_copy): New function.
(value_set_missing): Ditto.

diff --git a/src/data/ChangeLog b/src/data/ChangeLog
index 73aba2ff40c433adfb38c37a1a1f4a7f5dbfa9fb..73177f5bbb79c98898845b95e7f14d3e54c677d3 100644 (file)
--- a/src/data/ChangeLog
+++ b/src/data/ChangeLog
@@ -1,3 +1,8 @@
+2007-04-22  Ben Pfaff  <blp@gnu.org>
+
+       * value.c (value_copy): New function.
+       (value_set_missing): Ditto.
+
 2007-04-22 John Darrington <john@darrington.wattle.id.au>
 
        * Deleted existing category.h and moved cat-routines.h into 

diff --git a/src/data/value.c b/src/data/value.c
index 20d2a33ec3ef9eae3afa12969ba3927faa9436d5..5e94b68c2ed81b5abf656e29edca9c4df9d26e2f 100644 (file)
--- a/src/data/value.c
+++ b/src/data/value.c
@@ -53,3 +53,25 @@ hash_value (const union value *v, int width)
           ? 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); 
+}

diff --git a/src/data/value.h b/src/data/value.h
index 97d07b4632ed972e009b94a965ec9900e1eb9b14..e3e3f0de4ce9fab2267f535cd919bfdbdc73ba1f 100644 (file)
--- a/src/data/value.h
+++ b/src/data/value.h
@@ -50,4 +50,7 @@ union value *value_dup (const union value *, int width);
 int compare_values (const union value *, const union value *, int width);
 unsigned hash_value (const union value  *, int width);
 
+void value_copy (union value *, const union value *, int width);
+void value_set_missing (union value *, int width);
+
 #endif /* !value.h */