(encode_coding_string): Don't encode unibyte strings. (Bug#4047)

2 files changed, 9 insertions, 3 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 48105ecc78e..548f1c3dc40 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2009-08-22  Eli Zaretskii  <eliz@gnu.org>
+
+        * coding.h (encode_coding_string): Don't encode unibyte strings.
+        (Bug#4047)
+
 2009-08-22  Michael Albinus  <michael.albinus@gmx.de>
 
         * config.in (HAVE_DBUS_WATCH_GET_UNIX_FD): Add.
diff --git a/src/coding.h b/src/coding.h
index 27bc8333c6d..ca8878f1cbb 100644
--- a/src/coding.h
+++ b/src/coding.h
@@ -738,9 +738,10 @@ extern void encode_coding_object P_ ((struct coding_system *,
                         SBYTES (string), Qt)
 
 #define encode_coding_string(coding, string, nocopy)                    \
-  (encode_coding_object (coding, string, 0, 0, SCHARS (string),         \
-                         SBYTES (string), Qt),                          \
-   (coding)->dst_object)
+  (STRING_MULTIBYTE(string) ?                                           \
+    (encode_coding_object (coding, string, 0, 0, SCHARS (string),       \
+                           SBYTES (string), Qt),                        \
+     (coding)->dst_object) : (string))
 
 
 #define decode_coding_c_string(coding, src, bytes, dst_object)          \