From 1fbe46ddfe40c3c9a50070506b0873a989dd8659 Mon Sep 17 00:00:00 2001
From: Enno Rehling <enno.rehling@gmail.com>
Date: Sun, 27 Feb 2011 12:14:16 -0800
Subject: [PATCH] test for emptiness of a list (it's super-simple)

---
 src/util/quicklist.c      | 4 ++++
 src/util/quicklist.h      | 1 +
 src/util/quicklist_test.c | 2 ++
 3 files changed, 7 insertions(+)

diff --git a/src/util/quicklist.c b/src/util/quicklist.c
index 92eb38c08..8356106ca 100644
--- a/src/util/quicklist.c
+++ b/src/util/quicklist.c
@@ -47,6 +47,10 @@ int ql_length(const quicklist * ql) {
   return ql?ql->num_elements+ql_length(ql->next):0;
 }
 
+int ql_empty(const quicklist * ql) {
+  return !ql;
+}
+
 void ql_push(quicklist ** qlp, void * data) {
   quicklist * ql = 0;
   while(*qlp && ((*qlp)->next || (*qlp)->num_elements==QL_MAXSIZE)) {
diff --git a/src/util/quicklist.h b/src/util/quicklist.h
index 91eb55468..d70fa648c 100644
--- a/src/util/quicklist.h
+++ b/src/util/quicklist.h
@@ -25,6 +25,7 @@ extern "C" {
 typedef struct quicklist quicklist;
 void * ql_get(const struct quicklist * ql, int index);
 int ql_length(const struct quicklist * ql);
+int ql_empty(const struct quicklist * ql);
 void ql_push(struct quicklist ** qlp, void * data);
 int ql_delete(struct quicklist ** qlp, int index);
 int ql_insert(struct quicklist ** qlp, int index, void * data);
diff --git a/src/util/quicklist_test.c b/src/util/quicklist_test.c
index 5592599f8..ead3d2c78 100644
--- a/src/util/quicklist_test.c
+++ b/src/util/quicklist_test.c
@@ -19,7 +19,9 @@ static void test_insert(CuTest * tc) {
 
 static void test_insert_delete_gives_null(CuTest * tc) {
   struct quicklist * ql = NULL;
+  CuAssertIntEquals(tc, 1, ql_empty(ql));
   ql_push(&ql, (void*)42);
+  CuAssertIntEquals(tc, 0, ql_empty(ql));
   ql_delete(&ql, 0);
   CuAssertPtrEquals(tc, 0, ql);
 }