Add new file

update/grub.h

+#ifndef _GRUBENV_H
+#define _GRUBENV_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#define GRUBENV_SIZE 1024 
+
+#ifdef CONFIG_GRUBENV_PATH
+#define GRUBENV_PATH	CONFIG_GRUBENV_PATH
+#else
+#define GRUBENV_PATH	GRUBENV_DEFAULT_PATH
+#endif
+
+#define GRUBENV_PATH_NEW	GRUBENV_PATH ".new"
+
+struct grubenv_t {
+	struct dict vars;
+	size_t size;
+};
+int grubenv_set(const char *name, const char *value);
+int grubenv_unset(const char *name);
+int grubenv_apply_list(const char *script);
+char *grubenv_get(const char *name);
+
+#endif