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

[chise/xemacs-chise.git-] / src / mb-multibyte.h

diff --git a/src/mb-multibyte.h b/src/mb-multibyte.h
new file mode 100644 (file)
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+/* Header for generic multibyte 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.  */
+
+/* Rewritten by MORIOKA Tomohiko <tomo@m17n.org>. */
+
+#ifndef _XEMACS_MB_MULTIBYTE_H
+#define _XEMACS_MB_MULTIBYTE_H
+
+/************************************************************************/
+/*                     Operations on individual bytes                   */
+/*                             of any format                            */
+/************************************************************************/
+
+/* These are carefully designed to work if BYTE is signed or unsigned. */
+/* Note that SPC and DEL are considered ASCII, not control. */
+
+#define BYTE_ASCII_P(byte) (((byte) & ~0x7f) == 0)
+#define BYTE_C0_P(byte)    (((byte) & ~0x1f) == 0)
+#define BYTE_C1_P(byte)    (((byte) & ~0x1f) == 0x80)
+
+
+/************************************************************************/
+/*                        Dealing with characters                       */
+/************************************************************************/
+
+/* Is this character represented by more than one byte in a string? */
+
+#define CHAR_MULTIBYTE_P(c) ((c) >= 0x80)
+
+
+/* ---------------------------------------------------------------------- */
+/* (A) For working with charptr's (pointers to internally-formatted text) */
+/* ---------------------------------------------------------------------- */
+
+# define VALID_CHARPTR_P(ptr) BUFBYTE_FIRST_BYTE_P (* (unsigned char *) ptr)
+
+#define VALIDATE_CHARPTR_BACKWARD(ptr) do {    \
+  while (!VALID_CHARPTR_P (ptr)) ptr--;                \
+} while (0)
+
+/* This needs to be trickier to avoid the possibility of running off
+   the end of the string. */
+
+#define VALIDATE_CHARPTR_FORWARD(ptr) do {     \
+  Bufbyte *vcf_ptr = (ptr);                    \
+  VALIDATE_CHARPTR_BACKWARD (vcf_ptr);         \
+  if (vcf_ptr != (ptr))                                \
+    {                                          \
+      (ptr) = vcf_ptr;                         \
+      INC_CHARPTR (ptr);                       \
+    }                                          \
+} while (0)
+
+/* -------------------------------------------------------------------- */
+/* (C) For retrieving or changing the character pointed to by a charptr */
+/* -------------------------------------------------------------------- */
+
+#define simple_charptr_emchar(ptr)             ((Emchar) (ptr)[0])
+#define simple_set_charptr_emchar(ptr, x)      ((ptr)[0] = (Bufbyte) (x), 1)
+#define simple_charptr_copy_char(ptr, ptr2)    ((ptr2)[0] = *(ptr), 1)
+
+Emchar non_ascii_charptr_emchar (const Bufbyte *ptr);
+Bytecount non_ascii_set_charptr_emchar (Bufbyte *ptr, Emchar c);
+Bytecount non_ascii_charptr_copy_char (const Bufbyte *src, Bufbyte *dst);
+
+INLINE_HEADER Emchar charptr_emchar (const Bufbyte *ptr);
+INLINE_HEADER Emchar
+charptr_emchar (const Bufbyte *ptr)
+{
+  return BYTE_ASCII_P (*ptr) ?
+    simple_charptr_emchar (ptr) :
+    non_ascii_charptr_emchar (ptr);
+}
+
+INLINE_HEADER Bytecount set_charptr_emchar (Bufbyte *ptr, Emchar x);
+INLINE_HEADER Bytecount
+set_charptr_emchar (Bufbyte *ptr, Emchar x)
+{
+  return !CHAR_MULTIBYTE_P (x) ?
+    simple_set_charptr_emchar (ptr, x) :
+    non_ascii_set_charptr_emchar (ptr, x);
+}
+
+/* Copy the character pointed to by SRC into DST.
+   Return the number of bytes copied.  */
+INLINE_HEADER Bytecount
+charptr_copy_char (const Bufbyte *src, Bufbyte *dst);
+INLINE_HEADER Bytecount
+charptr_copy_char (const Bufbyte *src, Bufbyte *dst)
+{
+  return BYTE_ASCII_P (*src) ?
+    simple_charptr_copy_char (src, dst) :
+    non_ascii_charptr_copy_char (src, dst);
+}
+
+
+/************************************************************************/
+/*                            Exported functions                        */
+/************************************************************************/
+
+Emchar Lstream_get_emchar_1 (Lstream *stream, int first_char);
+int Lstream_fput_emchar (Lstream *stream, Emchar ch);
+void Lstream_funget_emchar (Lstream *stream, Emchar ch);
+
+int copy_internal_to_external (const Bufbyte *internal, Bytecount len,
+                              unsigned char *external);
+Bytecount copy_external_to_internal (const unsigned char *external,
+                                    int len, Bufbyte *internal);
+
+#endif /* _XEMACS_MB_MULTIBYTE_H */