address review comments

Author: c8ef

libc/test/src/search/lsearch_test.cpp

@@ -46,3 +46,25 @@ TEST(LlvmLibcLsearchTest, SearchNonExistent) {
   ASSERT_EQ(key, list[3]);
   ASSERT_EQ(len, 4UL);
 }
+
+TEST(LlvmLibcLsearchTest, SearchExceptional) {
+  int list[3] = {1, 2, 3};
+  size_t len = 3;
+  size_t max_len = ~0;
+  int key = 3;
+  void *ret_key =
+      LIBC_NAMESPACE::lsearch(nullptr, list, &len, sizeof(int), compar);
+  ASSERT_TRUE(ret_key == nullptr);
+  void *ret_base =
+      LIBC_NAMESPACE::lsearch(&key, nullptr, &len, sizeof(int), compar);
+  ASSERT_TRUE(ret_base == nullptr);
+  void *ret_nmemb =
+      LIBC_NAMESPACE::lsearch(&key, list, nullptr, sizeof(int), compar);
+  ASSERT_TRUE(ret_nmemb == nullptr);
+  void *ret_size =
+      LIBC_NAMESPACE::lsearch(&key, list, &max_len, sizeof(int), compar);
+  ASSERT_TRUE(ret_size == nullptr);
+  void *ret_compar =
+      LIBC_NAMESPACE::lsearch(&key, list, &len, sizeof(int), nullptr);
+  ASSERT_TRUE(ret_compar == nullptr);
+}