Merge r21-4-17-chise-0_23-release.

[chise/xemacs-chise.git-] / src / mb-utf-8.h

diff --git a/src/mb-utf-8.h b/src/mb-utf-8.h
new file mode 100644 (file)
index 0000000..c895a06
--- /dev/null
+++ b/src/mb-utf-8.h
@@ -0,0 +1,77 @@
+/* Header for UTF-8 string representation.
+   Copyright (C) 1999 Electrotechnical Laboratory, JAPAN.
+   Licensed to the Free Software Foundation.
+
+This file is part of XEmacs.
+
+XEmacs is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+XEmacs is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Author: MORIOKA Tomohiko <tomo@m17n.org>. */
+
+#ifndef _XEMACS_MB_UTF_8_H
+#define _XEMACS_MB_UTF_8_H
+
+#define MULTIBYTE
+
+/* Maximum number of buffer bytes per Emacs character. */
+#define MAX_EMCHAR_LEN 6
+
+/************************************************************************/
+/*                     Operations on individual bytes                   */
+/*                       in a Mule-formatted string                     */
+/************************************************************************/
+
+/* Does BYTE represent the first byte of a character? */
+
+INLINE_HEADER int BUFBYTE_FIRST_BYTE_P(Bufbyte byte);
+INLINE_HEADER int
+BUFBYTE_FIRST_BYTE_P(Bufbyte byte)
+{
+  return (byte <= 0x7F) || (0xC0 <= byte);
+}
+
+\f
+/************************************************************************/
+/*                        Dealing with characters                       */
+/************************************************************************/
+
+/* Is this character represented by more than one byte in a string? */
+
+#define CHAR_MULTIBYTE_P(c) ((c) >= 0x80)
+
+
+INLINE_HEADER int REP_BYTES_BY_FIRST_BYTE (Bufbyte fb);
+INLINE_HEADER int
+REP_BYTES_BY_FIRST_BYTE (Bufbyte fb)
+{
+  if ( fb < 0xC0 )
+    return 1;
+  else if ( fb < 0xE0 )
+    return 2;
+  else if ( fb < 0xF0 )
+    return 3;
+  else if ( fb < 0xF8 )
+    return 4;
+  else if ( fb < 0xFC )
+    return 5;
+  else
+    return 6;
+}
+
+
+#include "mb-multibyte.h"
+
+#endif /* _XEMACS_MB_UTF_8_H */