1 files changed, 40 insertions, 0 deletions
diff --git a/libc/wcsmbs/wcwidth.h b/libc/wcsmbs/wcwidth.h
new file mode 100644
index 000000000..c24dee912
--- /dev/null
+++ b/libc/wcsmbs/wcwidth.h
@@ -0,0 +1,40 @@
+/* Internal header containing implementation of wcwidth() function.
+   Copyright (C) 1996,1997,1999,2000,2001,2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <wchar.h>
+#include <wctype.h>
+#include "../wctype/wchar-lookup.h"
+#include "../locale/localeinfo.h"
+
+/* Table containing width information.  */
+extern const char *__ctype32_width attribute_hidden;
+
+static __inline int
+internal_wcwidth (wchar_t wc)
+{
+  unsigned char res;
+
+  /* The tables have been prepared in such a way that
+     1. wc == L'\0' yields res = 0,
+     2. !iswprint (wc) implies res = '\xff'.  */
+  res = wcwidth_table_lookup (_NL_CURRENT (LC_CTYPE, _NL_CTYPE_WIDTH), wc);
+
+  return res == (unsigned char) '\xff' ? -1 : (int) res;
+}