--- /dev/null
+#ifndef _TOOLS_LINUX_STRING_H_
+#define _TOOLS_LINUX_STRING_H_
+
+#include <stdlib.h>
+#include <string.h>
+#include <linux/types.h> /* for size_t */
+
+extern size_t strlcpy(char *dest, const char *src, size_t size);
+extern ssize_t strscpy(char *dest, const char *src, size_t count);
+extern char *strim(char *);
+extern void memzero_explicit(void *, size_t);
+int match_string(const char * const *, size_t, const char *);
+
+#define kstrndup(s, n, gfp) strndup(s, n)
+#define kstrdup(s, gfp) strdup(s)
+
+#endif /* _LINUX_STRING_H_ */