Add beginning wchar support

EFI uses 16 bit character strings. Add beginning support for this.
Since barebox uses 8 bit strings internally we need conversion functions
to convert between 16 bit and 8 bit strings.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

include/wchar.h

@@ -0,0 +1,18 @@
+#ifndef __WCHAR_H
+#define __WCHAR_H
+
+#include <linux/types.h>
+
+typedef u16 wchar_t;
+
+char *strcpy_wchar_to_char(char *dst, const wchar_t *src);
+
+wchar_t *strcpy_char_to_wchar(wchar_t *dst, const char *src);
+
+wchar_t *strdup_char_to_wchar(const char *src);
+
+char *strdup_wchar_to_char(const wchar_t *src);
+
+size_t wcslen(const wchar_t *s);
+
+#endif /* __WCHAR_H */

lib/Makefile

@@ -44,3 +44,4 @@ obj-y			+= gui/
 obj-$(CONFIG_XYMODEM)	+= xymodem.o
 obj-y			+= unlink-recursive.o
 obj-$(CONFIG_STMP_DEVICE) += stmp-device.o
+obj-y			+= wchar.o

lib/misc.c

@@ -21,6 +21,7 @@
 #include <malloc.h>
 #include <errno.h>
 #include <fs.h>
+#include <string.h>
 #include <linux/ctype.h>
 
 /*

lib/wchar.c

@@ -0,0 +1,80 @@
+/*
+ * wchar.c - wide character support
+ *
+ * Copyright (c) 2014 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program 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.
+ *
+ */
+
+#include <wchar.h>
+#include <malloc.h>
+#include <string.h>
+
+size_t wcslen(const wchar_t *s)
+{
+	size_t len = 0;
+
+	while (*s++)
+		len++;
+
+	return len;
+}
+
+char *strcpy_wchar_to_char(char *dst, const wchar_t *src)
+{
+	char *ret = dst;
+
+	while (*src)
+		*dst++ = *src++ & 0xff;
+
+	*dst = 0;
+
+	return ret;
+}
+
+wchar_t *strcpy_char_to_wchar(wchar_t *dst, const char *src)
+{
+	wchar_t *ret = dst;
+
+	while (*src)
+		*dst++ = *src++;
+
+	*dst = 0;
+
+	return ret;
+}
+
+wchar_t *strdup_char_to_wchar(const char *src)
+{
+	wchar_t *dst = malloc((strlen(src) + 1) * sizeof(wchar_t));
+
+	if (!dst)
+		return NULL;
+
+	strcpy_char_to_wchar(dst, src);
+
+	return dst;
+}
+
+char *strdup_wchar_to_char(const wchar_t *src)
+{
+	char *dst = malloc((wcslen(src) + 1));
+
+	if (!dst)
+		return NULL;
+
+	strcpy_wchar_to_char(dst, src);
+
+	return dst;
+}