From 8cf93b6ed2cb791aaf54274f70ce2d538b287cd5 Mon Sep 17 00:00:00 2001
From: Kenichi Handa <handa@m17n.org>
Date: Tue, 17 Feb 2004 00:18:01 +0000
Subject: [PATCH] (CHARSET_OFFSET): New macro.

---
 src/charset.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/charset.h b/src/charset.h
index 0965bb29d2c..a8e162d1a30 100644
--- a/src/charset.h
+++ b/src/charset.h
@@ -412,6 +412,15 @@ extern Lisp_Object Vchar_charset_set;
    : decode_char ((charset), (code)))
 
 
+/* If CHARSET is a simple offset base charset, return it's offset,
+   otherwise return -1.  */
+#define CHARSET_OFFSET(charset)				\
+  (((charset)->method == CHARSET_METHOD_OFFSET		\
+    && (charset)->code_linear_p				\
+    && ! (charset)->unified_p)				\
+   ? (charset)->code_offset - (charset)->min_code	\
+   : -1)
+
 extern Lisp_Object charset_work;
 
 /* Return a code point of CHAR in CHARSET.
-- 
2.39.5