Implement a basic pack function

1 files changed, 54 insertions, 0 deletions

diff --git a/test.c b/test.c
index 35813d0..adc20a1 100644
--- a/test.c
+++ b/test.c
@@ -3,6 +3,7 @@
  * SPDX-License-Identifier: MIT
  */
 #include <stdint.h>
+#include <assert.h>
 #include <inttypes.h>
 #include <stdio.h>
 #include <stdbool.h>
@@ -32,8 +33,47 @@ struct test {
 		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 { \
+	enum pack_status CHECK_PACK_s = pack(dest, sizeof (dest), fmt, __VA_ARGS__); \
+	if (CHECK_PACK_s != PACK_OK) { \
+		printf(__FILE__ ":%d pack(%p, %zu, " #fmt ", ...) -> %s (%d)\n", __LINE__, dest, sizeof (dest), pack_strerror(CHECK_PACK_s), CHECK_PACK_s); \
+		return false; \
+	} \
+} while (0)
+
+#define CHECK_BUFEQUAL(a, b) \
+	static_assert(sizeof (a) == sizeof (b), "CHECK_BUFEQUAL - buffer sizes don't match"); \
+	if (!do_check_bufequal(__FILE__, __LINE__, (a), (b), sizeof (a))) return false;
+
+static bool do_check_bufequal(const char *file, int line, void *a_, void *b_, size_t s)
+{
+	unsigned char *a = a_, *b = b_;
+	bool mismatch = false;
+	size_t start, end;
+	for (size_t i = 0; i < s; i++) {
+		if (a[i] == b[i]) continue;
+		if (!mismatch) {
+			start = i;
+			mismatch = true;
+		}
+		end = i + 1;
+	}
+	if (!mismatch) return true;
+	if (start > 0) start--;
+	if (end < s) end++;
+	printf("%s:%d buffers unequal\n idx", file, line);
+	for (size_t i = start; i < end; i++) printf(" %02zu", i);
+	printf("\n a =");
+	for (size_t i = start; i < end; i++) printf(" %02x", a[i]);
+	printf("\n b =");
+	for (size_t i = start; i < end; i++) printf(" %02x", b[i]);
+	putchar('\n');
+	return false;
+}
+
 #include "test.inc"
 
 TEST(unpack_simple0_float, "unpack simple float")
@@ -85,6 +125,20 @@ TEST(unpack_simple_padding, "unpack simple padding")
 	return true;
 }
 
+TEST(pack_simple_general, "pack simple general")
+{
+	unsigned char b[12] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
+
+	CHECK_PACK(b, ">ixxxBxxl", -123, 22, -12648430l);
+	CHECK_BUFEQUAL(b, DATA(0xff, 0x85,
+			       0x00, 0x00, 0x00,
+			       0x16,
+			       0x00, 0x00,
+			       0xff, 0x3f, 0x00, 0x12));
+
+	return true;
+}
+
 int main(void)
 {
 	extern struct test __start_tests, __stop_tests;