structeq: fix case where we mark padding as unknown.

[ccan] / ccan / structeq / test / run-with-unknown-padding.c

diff --git a/ccan/structeq/test/run-with-unknown-padding.c b/ccan/structeq/test/run-with-unknown-padding.c
new file mode 100644 (file)
index 0000000..c803e72
--- /dev/null
+++ b/ccan/structeq/test/run-with-unknown-padding.c
@@ -0,0 +1,39 @@
+#include <ccan/structeq/structeq.h>
+#include <ccan/tap/tap.h>
+
+/* In theory, this could be generated without padding, if alignof(int) were 0,
+ * and test would fail.  Call me when that happens. */
+struct mydata {
+       char start;
+       int end;
+};
+
+STRUCTEQ_DEF(mydata, -3, start, end);
+
+struct mydata2 {
+       char start;
+       int end;
+};
+
+STRUCTEQ_DEF(mydata2, -4, start, end);
+
+int main(void)
+{
+       struct mydata a, b;
+
+       /* This is how many tests you plan to run */
+       plan_tests(3);
+
+       a.start = 0;
+       a.end = 100;
+       ok1(mydata_eq(&a, &a));
+
+       b = a;
+       ok1(mydata_eq(&a, &b));
+
+       b.end++;
+       ok1(!mydata_eq(&a, &b));
+
+       /* This exits depending on whether all tests passed */
+       return exit_status();
+}