1 files changed, 56 insertions, 0 deletions
diff --git a/lib/sh/wcsnwidth.c b/lib/sh/wcsnwidth.c
new file mode 100644
index 0000000..9c7e7cc
--- /dev/null
+++ b/lib/sh/wcsnwidth.c
@@ -0,0 +1,56 @@
+/* wcsnwidth.c - compute display width of wide character string, up to max
+		 specified width, return length. */
+
+/* Copyright (C) 2012 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash 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 3 of the License, or
+   (at your option) any later version.
+
+   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#if defined (HANDLE_MULTIBYTE)
+
+#include <stdc.h>
+#include <wchar.h>
+#include <bashansi.h>
+
+/* Return the number of wide characters that will be displayed from wide string
+   PWCS.  If the display width exceeds MAX, return the number of wide chars
+   from PWCS required to display MAX characters on the screen. */
+int
+wcsnwidth(pwcs, n, max)
+     const wchar_t *pwcs;
+     size_t n, max;
+{
+  wchar_t wc, *ws;
+  int len, l;
+
+  len = 0;
+  ws = (wchar_t *)pwcs;
+  while (n-- > 0 && (wc = *ws++) != L'\0')
+    {
+      l = wcwidth (wc);
+      if (l < 0)
+	return (-1);
+      else if (l == max - len)
+        return (ws - pwcs);
+      else if (l > max - len)
+        return (--ws - pwcs);
+      len += l;
+    }
+  return (ws - pwcs);
+}
+#endif