Provide stub for mbrtowc().

library/libc.gmk

@@ -387,6 +387,7 @@ C_LIB := \
 	wchar_getwc.o \
 	wchar_getwchar.o \
 	wchar_mbrlen.o \
+	wchar_mbrtowc.o \
 	wchar_mbsinit.o \
 	wchar_mbsrtowcs.o \
 	wchar_putwc.o \

library/wchar_mbrtowc.c

@@ -0,0 +1,64 @@
+/*
+ * $Id: wchar_mbrlen.c,v 1.3 2006-01-08 12:04:27 obarthel Exp $
+ *
+ * :ts=4
+ *
+ * Portable ISO 'C' (1994) runtime library for the Amiga computer
+ * Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   - Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *   - Neither the name of Olaf Barthel nor the names of contributors
+ *     may be used to endorse or promote products derived from this
+ *     software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _WCHAR_HEADERS_H
+#include "wchar_headers.h"
+#endif /* _WCHAR_HEADERS_H */
+
+/****************************************************************************/
+
+/* Mostly non-working stub based on bionic */
+
+#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
+size_t
+mbrtowc(wchar_t *restrict pwc, const char *restrict s, size_t n, mbstate_t *restrict ps)
+{
+	if (s == NULL)
+	{
+		s = "";
+		pwc = NULL;
+	}
+
+	if (n == 0)
+	{
+		if (pwc)
+			*pwc = 0;
+		return 0;
+	}
+
+	if (pwc)
+		*pwc = *s;
+
+	return (*s != 0);
+}
+#endif /* __STDC_VERSION__ && __STDC_VERSION__ >= 199901L */