Fix bug #16216 with 'name' Unicode property of control characters.

 admin/unidata/unidata-gen.el (unidata-split-name): Don't give any NAME
 to <control> characters: the Unicode Standard says they have no
 name.

 doc/lispref/nonascii.texi (Character Properties): NAME or OLD-NAME
 properties can be nil (there's no empty string).

2 files changed, 14 insertions, 1 deletions

diff --git a/admin/ChangeLog b/admin/ChangeLog
index f49061e35df..7671ae409cd 100644
--- a/admin/ChangeLog
+++ b/admin/ChangeLog
@@ -1,3 +1,9 @@
+2013-12-22  Eli Zaretskii  <eliz@gnu.org>
+
+        * unidata/unidata-gen.el (unidata-split-name): Don't give any NAME
+        to <control> characters: the Unicode Standard says they have no
+        name.  (Bug#16216)
+
 2013-12-12  David Engster  <deng@randomsample.de>
 
         * grammars/c.by (expr-binop): Add MOD.
diff --git a/admin/unidata/unidata-gen.el b/admin/unidata/unidata-gen.el
index fa8f81636e3..ed531eeea25 100644
--- a/admin/unidata/unidata-gen.el
+++ b/admin/unidata/unidata-gen.el
@@ -984,7 +984,14 @@ is the character itself.")))
           (l nil)
           (idx 0)
           c)
-      (if (= len 0)
+      (if (or (= len 0)
+              ;; Unicode Standard, paragraph 4.8: "For all other
+              ;; Unicode code points of all other types (Control,
+              ;; Private-Use, Surrogate, Noncharacter, and Reserved),
+              ;; the value of the Name property is the null string."
+              ;; We already handle elsewhere all the characters except
+              ;; Cc, Control characters, which are handled here.
+              (string= str "<control>"))
           nil
         (dotimes (i len)
           (setq c (aref str i))