diff --git a/src/lib/memcmp.c b/src/lib/memcmp.c
new file mode 100644
index 0000000..46f13a4
--- /dev/null
+++ b/src/lib/memcmp.c
@@ -0,0 +1,17 @@
+#include <string.h>
+
+int memcmp(const void *src1, const void *src2, size_t bytes)
+{
+	const unsigned char *s1, *s2;
+	int result;
+	s1 = src1;
+	s2 = src2;
+	result = 0;
+	while((bytes > 0) && (result == 0)) {
+		result = *s1 - *s2;
+		bytes--;
+		s1++;
+		s2++;
+	}
+	return result;
+}