From: Eli Zaretskii <eliz@gnu.org>
Date: Sat, 20 May 2006 19:04:35 +0000 (+0000)
Subject: (CODING_REQUIRE_ENCODING): Elaborate the comment.
X-Git-Tag: emacs-pretest-22.0.90~2454
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=d836fdf52e0db7135b6be7cebcc0fe1d7f1c177e;p=emacs.git

(CODING_REQUIRE_ENCODING): Elaborate the comment.
---

diff --git a/src/coding.h b/src/coding.h
index 54553a071fa..5727b57a850 100644
--- a/src/coding.h
+++ b/src/coding.h
@@ -462,7 +462,10 @@ struct coding_system
    || (coding)->common_flags & CODING_REQUIRE_DECODING_MASK)
 
 /* Return 1 if the coding system CODING requires code conversion on
-   encoding.  */
+   encoding.
+   The non-multibyte part of the condition is to support encoding of
+   unibyte strings/buffers generated by string-as-unibyte or
+   (set-buffer-multibyte nil) from multibyte strings/buffers.  */
 #define CODING_REQUIRE_ENCODING(coding)	\
   ((coding)->src_multibyte		\
    || (coding)->common_flags & CODING_REQUIRE_ENCODING_MASK)