From fb95a5ac385d4d23366ad427d512615c1927a46e Mon Sep 17 00:00:00 2001
From: Tom Parker-Shemilt <palfrey@tevp.net>
Date: Sun, 10 Nov 2019 16:21:39 +0000
Subject: [PATCH] Fix list_drivers by a non-zero length buffer

---
 src/environment/list_data_sources.rs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/environment/list_data_sources.rs b/src/environment/list_data_sources.rs
index e2da09ed..b14f5496 100644
--- a/src/environment/list_data_sources.rs
+++ b/src/environment/list_data_sources.rs
@@ -177,8 +177,13 @@ impl Environment<Version3> {
         f: SqlInfoMethod,
         direction: ffi::FetchOrientation,
     ) -> Result<(ffi::SQLSMALLINT, ffi::SQLSMALLINT, usize)> {
-        let mut string_buf1 = [0; 0];
-        let mut string_buf2 = [0; 0];
+        // In theory, we should use zero-length buffers here
+        // However, if we do SQLDrivers gives us 0-length values for
+        // the attributes length, which is incorrect, so we allocated a
+        // reasonably large array which seems to make it do the right thing
+        let mut string_buf1 = [0; 1024];
+        let mut string_buf2 = [0; 1024];
+
         let mut max1 = 0;
         let mut max2 = 0;
         let mut count = 0;