From f8f4a9446550f2da7f1dc1892f780aacc7115ec3 Mon Sep 17 00:00:00 2001
From: Steve Holme <steve_holme@hotmail.com>
Date: Sun, 9 Feb 2020 04:37:52 +0000
Subject: [PATCH] url: Include the failure reason when
 curl_win32_idn_to_ascii() fails

Provide the failure reason in the failf() info just as we do for the
libidn2 version of code.

Closes #4899
---
 lib/url.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/url.c b/lib/url.c
index 07d429e35..f3b26dafa 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -1514,7 +1514,9 @@ static CURLcode idnconvert_hostname(struct connectdata *conn,
       host->name = host->encalloc;
     }
     else {
-      failf(data, "Failed to convert %s to ACE;\n", host->name);
+      char buffer[STRERROR_LEN];
+      failf(data, "Failed to convert %s to ACE; %s\n", host->name,
+            Curl_winapi_strerror(GetLastError(), buffer, sizeof(buffer)));
       return CURLE_URL_MALFORMAT;
     }
 #else