3 files changed, 22 insertions, 0 deletions
diff --git a/src/math.c b/src/math.c
index 4e9fee0..143a48d 100644
--- a/src/math.c
+++ b/src/math.c
@@ -41,3 +41,6 @@ mul_size(const size_t x, const size_t y, size_t *const out) {
 out:
 	return rc;
 }
+
+extern inline size_t
+max_size(const size_t x, const size_t y);
diff --git a/src/math.h b/src/math.h
index 4dab4a7..79b52f0 100644
--- a/src/math.h
+++ b/src/math.h
@@ -3,3 +3,8 @@ add_size(const size_t x, const size_t y, size_t *const out);
 
 int
 mul_size(const size_t x, const size_t y, size_t *const out);
+
+inline size_t
+max_size(size_t x, size_t y) {
+	return x > y ? x : y;
+}
diff --git a/tests/math.c b/tests/math.c
index 2aefa59..5dcebda 100644
--- a/tests/math.c
+++ b/tests/math.c
@@ -122,6 +122,19 @@ test_mul_size(void) {
 	}
 }
 
+static void
+test_max_size(void) {
+	test_start("max_size()");
+
+	{
+		testing("simplistic cases");
+		assert(max_size(0U, 0U) == 0U);
+		assert(max_size(1U, 0U) == 1U);
+		assert(max_size(10U, SIZE_MAX + 1U) == 10U);
+		test_ok();
+	}
+}
+
 
 int
 main(void) {
@@ -129,6 +142,7 @@ main(void) {
 
 	test_add_size();
 	test_mul_size();
+	test_max_size();
 
 	rc = EXIT_SUCCESS;
 	return rc;