[PATCH 0/1] MR8508: cfgmgr32: Preserve registry casing when getting device interface list.

[Arek Hiler (＠ivyl)]

This fixes SDL3 wrongly using their HIDAPI backend for XInput devices on
Wine due to a case-sensitive check for `&IG_`.

[PATCH 1/1] cfgmgr32: Preserve registry casing when getting device interface list.

[Arkadiusz Hiler]

From: Arkadiusz Hiler

This fixes SDL3 wrongly using their HIDAPI backend for XInput devices on
Wine due to a case-sensitive check for `&IG_`.
---
 dlls/cfgmgr32/tests/Makefile.in |  2 +-
 dlls/cfgmgr32/tests/cfgmgr32.c  | 41 +++++++++++++++++++++++++++++++++
 dlls/setupapi/devinst.c         | 20 +++++++---------
 3 files changed, 50 insertions(+), 13 deletions(-)

diff --git a/dlls/cfgmgr32/tests/Makefile.in b/dlls/cfgmgr32/tests/Makefile.in
index 64a01ccf492..90f5ac496a3 100644
--- a/dlls/cfgmgr32/tests/Makefile.in
+++ b/dlls/cfgmgr32/tests/Makefile.in
@@ -1,5 +1,5 @@
 TESTDLL = cfgmgr32.dll
-IMPORTS = cfgmgr32 setupapi ole32 uuid
+IMPORTS = cfgmgr32 setupapi ole32 uuid advapi32

SOURCES = \
    cfgmgr32.c
diff --git a/dlls/cfgmgr32/tests/cfgmgr32.c b/dlls/cfgmgr32/tests/cfgmgr32.c
index 02741d0d963..ff9b45b760d 100644
--- a/dlls/cfgmgr32/tests/cfgmgr32.c
+++ b/dlls/cfgmgr32/tests/cfgmgr32.c
@@ -365,6 +365,46 @@ static void test_CM_Register_Notification( void )
     }
 }

+static void check_device_path_casing(const WCHAR *original_path)
+{
+    HKEY current_key, tmp;
+    WCHAR *path = wcsdup(original_path);
+    WCHAR key_name[MAX_PATH];
+    WCHAR separator[] = L"#";
+    WCHAR *token, *context = NULL;
+    LSTATUS ret;
+    DWORD i;
+
+    ret = RegOpenKeyW(HKEY_LOCAL_MACHINE, L"SYSTEM\CurrentControlSet\Enum", &current_key);
+    ok(!ret, "Failed to open enum key: %#lx.\n", ret);
+
+    token = wcstok_s(path + 4, separator, &context);  /* skip \?\ */
+    while (token)
+    {
+        if (token[0] == L'{' && wcslen(token) == 38) break; /* reached GUID part, done */
+
+        i = 0;
+        while (!(ret = RegEnumKeyW(current_key, i++, key_name, ARRAY_SIZE(key_name))))
+        {
+            if(!wcscmp(token, key_name))
+            {
+                ret = RegOpenKeyW(current_key, token, &tmp);
+                ok(!ret, "Failed to open registry key %s: %#lx.\n", debugstr_w(token), ret);
+                RegCloseKey(current_key);
+                current_key = tmp;
+                break;
+            }
+        }
+        ok(!ret, "Failed to find %s in registry: %#lx.\n", debugstr_w(token), ret);
+        if (ret) break;
+
+        token = wcstok_s(NULL, separator, &context);
+    }
+
+    RegCloseKey(current_key);
+    free(path);
+}
+
 static void test_CM_Get_Device_Interface_List(void)
 {
     BYTE iface_detail_buffer[sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA_W) + 256 * sizeof(WCHAR)];
@@ -420,6 +460,7 @@ static void test_CM_Get_Device_Interface_List(void)
     {
         DEVPROP_BOOLEAN val = DEVPROP_FALSE;

+        check_device_path_casing(p);
         set = SetupDiCreateDeviceInfoListExW(NULL, NULL, NULL, NULL);
         ok(set != INVALID_HANDLE_VALUE, "got %p.\n", set);
         bret = SetupDiOpenDeviceInterfaceW(set, p, 0, &iface);
diff --git a/dlls/setupapi/devinst.c b/dlls/setupapi/devinst.c
index 066bd6f09c2..f05b8054e39 100644
--- a/dlls/setupapi/devinst.c
+++ b/dlls/setupapi/devinst.c
@@ -407,8 +407,6 @@ static LPWSTR SETUPDI_CreateSymbolicLinkPath(LPCWSTR instanceId,
         }
     }

-    CharLowerW(ret);
-
     return ret;
 }

@@ -3037,6 +3035,8 @@ BOOL WINAPI SetupDiGetDeviceInterfaceDetailA(HDEVINFO devinfo, SP_DEVICE_INTERFA
         else
             DeviceInterfaceDetailData->DevicePath[0] = '\0';

+        CharLowerA(DeviceInterfaceDetailData->DevicePath);
+
         ret = TRUE;
     }
     else
@@ -3095,6 +3095,8 @@ BOOL WINAPI SetupDiGetDeviceInterfaceDetailW(HDEVINFO devinfo, SP_DEVICE_INTERFA
         else
             DeviceInterfaceDetailData->DevicePath[0] = '\0';

+        CharLowerW(DeviceInterfaceDetailData->DevicePath);
+
         ret = TRUE;
     }
     else
@@ -4883,12 +4885,9 @@ static CONFIGRET get_device_interface_list(const GUID *class_guid, DEVINSTID_W d
 {
     const ULONG supported_flags = CM_GET_DEVICE_INTERFACE_LIST_ALL_DEVICES;

-    BYTE iface_detail_buffer[sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA_W) + 256 * sizeof(WCHAR)];
     SP_DEVICE_INTERFACE_DATA iface = {sizeof(iface)};
-    SP_DEVICE_INTERFACE_DETAIL_DATA_W *iface_data;
     SP_DEVINFO_DATA device = { sizeof(device) };
     ULONG query_flags = DIGCF_DEVICEINTERFACE;
-    CONFIGRET ret = CR_SUCCESS;
     unsigned int i, id_len;
     HDEVINFO set;
     ULONG needed;
@@ -4915,15 +4914,12 @@ static CONFIGRET get_device_interface_list(const GUID *class_guid, DEVINSTID_W d
     if (set == INVALID_HANDLE_VALUE)
         return CR_SUCCESS;

-    iface_data = (SP_DEVICE_INTERFACE_DETAIL_DATA_W *)iface_detail_buffer;
-    iface_data->cbSize = sizeof(*iface_data);
-
     p = buffer;
     for (i = 0; SetupDiEnumDeviceInterfaces(set, NULL, class_guid, i, &iface); ++i)
     {
-        ret = SetupDiGetDeviceInterfaceDetailW(set, &iface, iface_data, sizeof(iface_detail_buffer), NULL, &device);
-        if (!ret) continue;
-        id_len = wcslen(iface_data->DevicePath) + 1;
+        struct device_iface *device_iface;
+        device_iface = get_device_iface(set, &iface);
+        id_len = wcslen(device_iface->symlink) + 1;
         needed += id_len;
         if (buffer)
         {
@@ -4933,7 +4929,7 @@ static CONFIGRET get_device_interface_list(const GUID *class_guid, DEVINSTID_W d
                 *buffer = 0;
                 return CR_BUFFER_SMALL;
             }
-            memcpy(p, iface_data->DevicePath, sizeof(*p) * id_len);
+            memcpy(p, device_iface->symlink, sizeof(*p) * id_len);
             p += id_len;
         }
     }

[Arek Hiler (＠ivyl)]

SDL code in question: https://github.com/libsdl-org/SDL/blob/release-3.2.16/src/hidapi/windows/hid...

At first I thought cfgmgr32 may be doing the opposite of SetupAPI and just force-uppercase everything, but during the course of writing tests turns out casing is used in the registry is preserved.