src/math.h: Add "add_size()"

1 files changed, 65 insertions, 1 deletions

diff --git a/tests/math.c b/tests/math.c
index 34f54ce..d2b64c6 100644
--- a/tests/math.c
+++ b/tests/math.c
@@ -1,9 +1,72 @@
 #include "../src/math.c"
 
+#include <stdlib.h>
+
 #include "../src/testing.h"
 
 
 static void
+test_add_size(void) {
+	test_start("add_size()");
+
+	size_t val;
+	{
+		testing("zero values");
+
+		assert(add_size(0U, 0U, &val) == 0);
+		assert(val == 0U);
+
+		assert(add_size(1U, 0U, &val) == 0);
+		assert(val == 1U);
+
+		assert(add_size(0U, 1U, &val) == 0);
+		assert(val == 1U);
+
+		assert(add_size(0U, 3U, &val) == 0);
+		assert(val == 3U);
+
+		assert(add_size(30U, 0U, &val) == 0);
+		assert(val == 30U);
+
+		test_ok();
+	}
+	{
+		testing("small values");
+
+		assert(add_size(1U, 2U, &val) == 0);
+		assert(val == 3U);
+
+		assert(add_size(34U, 56U, &val) == 0);
+		assert(val == 90U);
+
+		assert(add_size(121U, 122U, &val) == 0);
+		assert(val == 243U);
+
+		test_ok();
+	}
+	{
+		testing("big values");
+
+		assert(add_size(SIZE_MAX, 0U, &val) == 0);
+		assert(val == SIZE_MAX);
+
+		assert(add_size(SIZE_MAX - 10U, 3U, &val) == 0);
+		assert(val == (SIZE_MAX - 7U));
+
+		test_ok();
+	}
+	{
+		testing("overflowing values");
+
+		val = 0U;
+		assert(add_size(SIZE_MAX, 1U, &val) != 0);
+		assert(val == 0U);
+
+		test_ok();
+	}
+}
+
+static void
 test_mul_size(void) {
 	test_start("mul_size()");
 
@@ -62,6 +125,7 @@ test_mul_size(void) {
 
 int
 main(void) {
+	test_add_size();
 	test_mul_size();
-	return 0;
+	return EXIT_SUCCESS;
 }