support McKernel's sysfs tree

lib/include/vsprintf.h

@@ -0,0 +1,22 @@
+/**
+ * \file vsprintf.h
+ *  License details are found in the file LICENSE.
+ * \brief
+ *  declare printf() like functions
+ * \author Gou Nakamura  <go.nakamura.yw@hitachi-solutions.com> \par
+ * 	Copyright (C) 2015  RIKEN AICS
+ */
+/*
+ * HISTORY
+ */
+
+#ifndef VSPRINTF_H
+#define VSPRINTF_H
+
+#include <stdarg.h>
+#include <types.h>
+
+extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
+extern int snprintf(char *buf, size_t size, const char *fmt, ...);
+
+#endif