date_test: Added some simple overflow tests.

diff --git a/t/core/data_test.c b/t/core/data_test.c
index 420ee851bd38587f3168981393df54b154c0d7a8..8af042a8a79a1cfb53deccd7c6a55874d327ec15 100644 (file)
--- a/t/core/data_test.c
+++ b/t/core/data_test.c
@@ -154,16 +154,25 @@ START_TEST(test_format)
 
        for (i = 0; i < SDB_STATIC_ARRAY_LEN(golden_data); ++i) {
                sdb_data_t *datum = &golden_data[i].datum;
-               char buf[sdb_data_strlen(datum) + 1];
+               char buf[sdb_data_strlen(datum) + 2];
                int check;
 
-               check = sdb_data_format(datum, buf, sizeof(buf));
+               memset(buf, (int)'A', sizeof(buf));
+
+               check = sdb_data_format(datum, buf, sizeof(buf) - 1);
                fail_unless(! check,
                                "sdb_data_format(type=%s) = %d; expected: 0",
                                SDB_TYPE_TO_STRING(datum->type), check);
                fail_unless(! strcmp(buf, golden_data[i].expected),
                                "sdb_data_format(type=%s) used wrong format: %s; expected: %s",
                                SDB_TYPE_TO_STRING(datum->type), buf, golden_data[i].expected);
+
+               fail_unless(buf[sizeof(buf) - 2] == '\0',
+                               "sdb_data_format(type=%s) did not nul-terminate the buffer",
+                               SDB_TYPE_TO_STRING(datum->type));
+               fail_unless(buf[sizeof(buf) - 1] == 'A',
+                               "sdb_data_format(type=%s) wrote past the end of the buffer",
+                               SDB_TYPE_TO_STRING(datum->type));
        }
 }
 END_TEST