1 /* Header for generic multibyte string representation.
2 Copyright (C) 1999 Electrotechnical Laboratory, JAPAN.
3 Licensed to the Free Software Foundation.
5 This file is part of XEmacs.
7 XEmacs is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2, or (at your option) any
12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with XEmacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* Rewritten by MORIOKA Tomohiko <tomo@m17n.org>. */
24 #ifndef _XEMACS_MB_MULTIBYTE_H
25 #define _XEMACS_MB_MULTIBYTE_H
27 /* ---------------------------------------------------------------------- */
28 /* (A) For working with charptr's (pointers to internally-formatted text) */
29 /* ---------------------------------------------------------------------- */
31 # define VALID_CHARPTR_P(ptr) BUFBYTE_FIRST_BYTE_P (* (unsigned char *) ptr)
33 #define VALIDATE_CHARPTR_BACKWARD(ptr) do { \
34 while (!VALID_CHARPTR_P (ptr)) ptr--; \
37 /* This needs to be trickier to avoid the possibility of running off
38 the end of the string. */
40 #define VALIDATE_CHARPTR_FORWARD(ptr) do { \
41 Bufbyte *vcf_ptr = (ptr); \
42 VALIDATE_CHARPTR_BACKWARD (vcf_ptr); \
43 if (vcf_ptr != (ptr)) \
50 /* -------------------------------------------------------------------- */
51 /* (C) For retrieving or changing the character pointed to by a charptr */
52 /* -------------------------------------------------------------------- */
54 #define simple_charptr_emchar(ptr) ((Emchar) (ptr)[0])
55 #define simple_set_charptr_emchar(ptr, x) ((ptr)[0] = (Bufbyte) (x), 1)
56 #define simple_charptr_copy_char(ptr, ptr2) ((ptr2)[0] = *(ptr), 1)
58 Emchar non_ascii_charptr_emchar (CONST Bufbyte *ptr);
59 Bytecount non_ascii_set_charptr_emchar (Bufbyte *ptr, Emchar c);
60 Bytecount non_ascii_charptr_copy_char (CONST Bufbyte *ptr, Bufbyte *ptr2);
62 INLINE Emchar charptr_emchar (CONST Bufbyte *ptr);
64 charptr_emchar (CONST Bufbyte *ptr)
66 return BYTE_ASCII_P (*ptr) ?
67 simple_charptr_emchar (ptr) :
68 non_ascii_charptr_emchar (ptr);
71 INLINE Bytecount set_charptr_emchar (Bufbyte *ptr, Emchar x);
73 set_charptr_emchar (Bufbyte *ptr, Emchar x)
75 return !CHAR_MULTIBYTE_P (x) ?
76 simple_set_charptr_emchar (ptr, x) :
77 non_ascii_set_charptr_emchar (ptr, x);
80 INLINE Bytecount charptr_copy_char (CONST Bufbyte *ptr, Bufbyte *ptr2);
82 charptr_copy_char (CONST Bufbyte *ptr, Bufbyte *ptr2)
84 return BYTE_ASCII_P (*ptr) ?
85 simple_charptr_copy_char (ptr, ptr2) :
86 non_ascii_charptr_copy_char (ptr, ptr2);
89 #endif /* _XEMACS_MB_MULTIBYTE_H */