diff --git a/include/libbb.h b/include/libbb.h
index 9a1fdde..fdabc4b 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -24,4 +24,6 @@
 	int (*dirAction) (const char *fileName, struct stat* statbuf, void* userData, int depth),
 	void* userData, const unsigned depth);
 
+char * safe_strncpy(char *dst, const char *src, size_t size);
+
 #endif /* __LIBBB_H */
diff --git a/lib/libbb.c b/lib/libbb.c
index daa484c..dd32307 100644
--- a/lib/libbb.c
+++ b/lib/libbb.c
@@ -99,3 +99,11 @@
 	return NULL;
 }
 
+/* Like strncpy but make sure the resulting string is always 0 terminated. */
+char * safe_strncpy(char *dst, const char *src, size_t size)
+{
+	if (!size) return dst;
+	dst[--size] = '\0';
+	return strncpy(dst, src, size);
+}
+