1 files changed, 72 insertions, 0 deletions
diff --git a/stdlib/wctomb.c b/stdlib/wctomb.c
new file mode 100644
index 0000000000..53f1cef3fc
--- /dev/null
+++ b/stdlib/wctomb.c
@@ -0,0 +1,72 @@
+/* Copyright (C) 1991, 1992, 1995 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 <localeinfo.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+
+extern long int _mb_shift;	/* Defined in mbtowc.c.  */
+
+/* Convert WCHAR into its multibyte character representation,
+   putting this in S and returning its length.  */
+int
+DEFUN(wctomb, (s, wchar), register char *s AND wchar_t wchar)
+{
+  register CONST mb_char *mb;
+
+  if (_ctype_info->mbchar == NULL)
+    mb = NULL;
+  else
+    mb = _ctype_info->mbchar->mb_chars;
+
+  /* If S is NULL, just say if we're shifted or not.  */
+  if (s == NULL)
+    return _mb_shift != 0;
+
+  if (wchar == (wchar_t) '\0')
+    {
+      _mb_shift = 0;
+      /* See ANSI 4.4.1.1, line 21.  */
+      if (s != NULL)
+	*s = '\0';
+      return 1;
+    }
+  else if (mb == NULL)
+    {
+      if ((wchar_t) (char) wchar == wchar && isascii ((char) wchar))
+	{
+	  /* A normal ASCII character translates to itself.  */
+	  if (s != NULL)
+	    *s = (char) wchar;
+	  return 1;
+	}
+      return -1;
+    }
+
+  mb += wchar + _mb_shift;
+  if (mb->string == NULL || mb->len == 0)
+    return -1;
+  memcpy((PTR) s, (CONST PTR) mb->string, mb->len + 1);
+  _mb_shift += mb->shift;
+  return mb->len;
+}