ensure first_log isn't null after append

test/util.c

@@ -110,8 +110,9 @@ static void chk_TestState_ptr_eq(
 	const TestState *
 );
 
-decl_test(chk_int_eq_test);
-decl_test(chk_ptr_eq_test);
+decl_test(chk_int_eq_test); // ensure ints are equal
+decl_test(chk_ptr_eq_test); // ensure pointers are equal
+decl_test(chk_ptr_ne_test); // ensure pointers are not equal
 
 // Public Functions
 
@@ -179,6 +180,24 @@ chk_ptr_eq(
 	s->ptr = old_ptr;
 }
 
+void
+chk_ptr_ne(
+	TestState *s,
+	const char *context,
+	const void *actual,
+	const void *prohibited
+)
+{
+	void *old_ptr = s->ptr;
+	ComparePtrs cp;
+	cp.context = context;
+	cp.chk_val = actual;
+	cp.ref_val = prohibited;
+	s->ptr = &cp;
+	run_test(s, chk_ptr_ne_test);
+	s->ptr = old_ptr;
+}
+
 // Local Functions
 
 static void
@@ -319,4 +338,15 @@ def_test(chk_ptr_eq_test, s)
 	return test_failure;
 }
 
+def_test(chk_ptr_ne_test, s)
+{
+	const ComparePtrs *cp = s->ptr;
+	if (cp->chk_val != cp->ref_val) return test_success;
+	char str[STR_BUF_SIZE];
+	append_test_log(s, cp->context);
+	snprintf(str, STR_BUF_SIZE, "\tcannot be: 0x%x", cp->ref_val);
+	append_test_log(s, str);
+	return test_failure;
+}
+
 //jl