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[glibc.git] / wcsmbs / wcwidth.h
blob92ee3d62fecadb1b6ca14bf245e5f80e371c9719
1 /* Internal header containing implementation of wcwidth() function.
2 Copyright (C) 1996, 1997, 1999, 2000, 2001 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
21 #include <wchar.h>
22 #include <wctype.h>
23 #include "../wctype/wchar-lookup.h"
25 /* Table containing width information. */
26 extern const char *__ctype32_width;
28 static __inline int
29 internal_wcwidth (wchar_t wc)
31 unsigned char res;
33 /* The tables have been prepared in such a way that
34 1. wc == L'\0' yields res = 0,
35 2. !iswprint (wc) implies res = '\xff'. */
36 res = wcwidth_table_lookup (__ctype32_width, wc);
38 return res == (unsigned char) '\xff' ? -1 : (int) res;