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[lib/c] Add strnlen()

--- a/lib/c/strnlen.c

+++ b/lib/c/strnlen.c

@@ -5,5 +5,9 @@

 size_t

 strnlen(const char *s, size_t maxlen)

 {

-	return 0;

+	size_t n;

+

+	for (n = 0; n < maxlen && *s++; ++n)

+		;

+	return n;

 }