From 5b31a09c18ee399869590d9b44eab0665b13c3ab Mon Sep 17 00:00:00 2001
From: Tomasz Kramkowski <tk@the-tk.com>
Date: Wed, 11 Aug 2021 01:23:10 +0100
Subject: test.c: add simple unpack_struct test

---
 test.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/test.c b/test.c
index c06efe5..c5ce521 100644
--- a/test.c
+++ b/test.c
@@ -35,6 +35,17 @@ struct test {
 	} \
 } while (0)
 
+#define CHECK_UNPACK_STRUCT(data, args, dest) do { \
+	enum pack_status CHECK_UNPACK_STRUCT_s = \
+		unpack_struct(data, sizeof (data), args, dest); \
+	if (CHECK_UNPACK_STRUCT_s != PACK_OK) { \
+		printf(__FILE__ ":%d unpack_struct(" #data ", " #args ", " #dest ") -> %s (%d)\n", \
+		       __LINE__, pack_strerror(CHECK_UNPACK_STRUCT_s), \
+		       CHECK_UNPACK_STRUCT_s); \
+		return false; \
+	} \
+} while(0)
+
 #define CHECK_EQUAL(f, a, b) if (a != b) { printf(__FILE__ ":%d %"f" != %"f"\n", __LINE__, a, b); return false; }
 
 #define CHECK_PACK(dest, fmt, ...) do { \
@@ -141,6 +152,41 @@ TEST(pack_simple_general, "pack simple general")
 	return true;
 }
 
+TEST(unpack_struct_simple, "unpack_struct simple")
+{
+	struct dest {
+		int i;
+		unsigned char B;
+		float f;
+	} v = { __LINE__, __LINE__ + 1, __LINE__ + 2 };
+	struct pack_args args = {
+		.endian = PACK_ENDIAN_BIG,
+		.fields = (struct pack_field []){
+			{ PACK_TYPE_INT, 1, offsetof(struct dest, i) },
+			{ PACK_TYPE_PADDING, 3, 0 },
+			{ PACK_TYPE_UCHAR, 1, offsetof(struct dest, B) },
+			{ PACK_TYPE_PADDING, 2, 0 },
+			{ PACK_TYPE_FLOAT, 1, offsetof(struct dest, f) },
+		},
+		.num_fields = 5,
+	};
+	unsigned char d[] = {
+		0xff, 0x85,
+		0x00, 0x00, 0x00,
+		0x16,
+		0x00, 0x00,
+		0x40, 0x44, 0x58, 0x00
+	};
+
+	CHECK_UNPACK_STRUCT(d, &args, &v);
+
+	CHECK_EQUAL("d", v.i, -123);
+	CHECK_EQUAL("d", v.B, 22);
+	CHECK_EQUAL("f", v.f, 0x1.88bp+1);
+
+	return true;
+}
+
 int main(void)
 {
 	extern struct test __start_tests, __stop_tests;
-- 
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