kernel: implement memcmp

1 files changed, 11 insertions, 0 deletions

diff --git a/src/kernel/util.c b/src/kernel/util.c
index f4dc5e1..0977745 100644
--- a/src/kernel/util.c
+++ b/src/kernel/util.c
@@ -15,3 +15,14 @@ void *memset(void *s, int c, size_t n) {
 		s2[i] = c;
 	return s;
 }
+
+int memcmp(const void *s1, const void *s2, size_t n) {
+	const unsigned char *c1 = s1, *c2 = s2;
+	for (size_t i = 0; i < n; i++) {
+		if (c1[i] != c2[i]) {
+			if (c1[i] < c2[i])  return -1;
+			else                return 1;
+		}
+	}
+	return 0;
+}