1 files changed, 78 insertions, 0 deletions
diff --git a/stdlib/mbstowcs.c b/stdlib/mbstowcs.c
new file mode 100644
index 0000000000..38c710279a
--- /dev/null
+++ b/stdlib/mbstowcs.c
@@ -0,0 +1,78 @@
+/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <ctype.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+
+extern int _mb_shift;	/* Defined in mbtowc.c.  */
+
+/* Convert the string of multibyte characters in S to `wchar_t's in
+   PWCS, writing no more than N.  Return the number written,
+   or (size_t) -1 if an invalid multibyte character is encountered.  */
+size_t
+DEFUN(mbstowcs, (pwcs, s, n),
+      register wchar_t *pwcs AND register CONST char *s AND register size_t n)
+{
+  int save_shift;
+  register size_t written = 0;
+
+  /* Save the shift state.  */
+  save_shift = _mb_shift;
+  /* Reset the shift state.  */
+  _mb_shift = 0;
+
+  while (*s != '\0')
+    {
+      int len;
+      if (isascii (*s))
+	{
+	  *pwcs = (wchar_t) *s;
+	  len = 1;
+	}
+      else
+	len = mbtowc (pwcs, s, n);
+
+      if (len < 1)
+	{
+	  /* Return an error.  */
+	  written = (size_t) -1;
+	  break;
+	}
+      else
+	{
+	  /* Multibyte character converted.  */
+	  ++pwcs;
+	  ++written;
+	  s += len;
+	  n -= len;
+	}
+    }
+
+  /* Terminate the string if it has space.  */
+  if (n > 0)
+    *pwcs = (wchar_t) 0;
+
+  /* Restore the old shift state.  */
+  _mb_shift = save_shift;
+
+  /* Return how many we wrote (or maybe an error).  */
+  return written;
+}