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

[chise/xemacs-chise.git-] / src / char-lb.h

diff --git a/src/char-lb.h b/src/char-lb.h
new file mode 100644 (file)
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--- /dev/null
+++ b/src/char-lb.h
@@ -0,0 +1,88 @@
+/* Header for leading-byte character representation.
+   Copyright (C) 1999,2000 MORIOKA Tomohiko
+
+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.  */
+
+#ifndef _XEMACS_CHAR_LB_H
+#define _XEMACS_CHAR_LB_H
+
+#include "mule-charset.h"
+
+int non_ascii_valid_char_p (Emchar ch);
+
+INLINE_HEADER int valid_char_p (Emchar ch);
+INLINE_HEADER int
+valid_char_p (Emchar ch)
+{
+  return ((unsigned int) (ch) <= 0xff) || non_ascii_valid_char_p (ch);
+}
+
+#define CHAR_COLUMNS(c)     (XCHARSET_COLUMNS(CHAR_CHARSET(c)))
+
+
+INLINE_HEADER Emchar DECODE_CHAR (Lisp_Object charset, int code_point);
+INLINE_HEADER Emchar
+DECODE_CHAR (Lisp_Object charset, int code_point)
+{
+  if (EQ (charset, Vcharset_ascii))
+    return code_point;
+  else if (EQ (charset, Vcharset_control_1))
+    return code_point | 0x80;
+  else if (XCHARSET_DIMENSION (charset) == 1)
+    return ((XCHARSET_LEADING_BYTE (charset) -
+            FIELD2_TO_OFFICIAL_LEADING_BYTE) << 7) | code_point;
+  else if (!XCHARSET_PRIVATE_P (charset))
+    return ((XCHARSET_LEADING_BYTE (charset) -
+            FIELD1_TO_OFFICIAL_LEADING_BYTE) << 14)
+      | ((code_point >> 1) & 0x3F80) | (code_point & 0x7F);
+  else
+    return ((XCHARSET_LEADING_BYTE (charset) -
+            FIELD1_TO_PRIVATE_LEADING_BYTE) << 14)
+      | ((code_point >> 1) & 0x3F80) | (code_point & 0x7F);
+}
+
+INLINE_HEADER int encode_char_1 (Emchar ch, Lisp_Object* charset);
+INLINE_HEADER int
+encode_char_1 (Emchar ch, Lisp_Object* charset)
+{
+  *charset = CHAR_CHARSET (ch);
+  return  XCHARSET_DIMENSION (*charset) == 1
+    ? CHAR_FIELD3 (ch)
+    : (CHAR_FIELD2 (ch) << 8) | CHAR_FIELD3 (ch);
+}
+
+#define ENCODE_CHAR(ch, charset)       encode_char_1 (ch, &(charset))
+
+
+typedef struct Charc
+{
+  Lisp_Object charset;
+  unsigned short code_point;
+} Charc;
+
+INLINE_HEADER Charc CHAR_TO_CHARC (Emchar ch);
+INLINE_HEADER Charc
+CHAR_TO_CHARC (Emchar ch)
+{
+  Charc cc;
+
+  cc.code_point = encode_char_1 (ch, &cc.charset);
+  return cc;
+}
+
+#endif /* _XEMACS_CHAR_LB_H */