win32u: Preserve rawinput device instance ID case in add_device().

In ntoskrnl.exe, when a PnP device interface is registered, the interface path casing is retained, with only the hardware ID being upper case. Thus, this patch looks to align the behaviour between PnP and rawinput, particularly for games that seem to rely on these two strings being consistent for hotplug. This updated behaviour also seems consistent with Windows.

win32u: Preserve rawinput device instance ID case in add_device().
4f8939e1 · Nicholas Tay · Alexandre Julliard · a1129ed2 · 4f8939e1
Commit 4f8939e1 authored Jan 17, 2024 by Nicholas Tay Committed by Alexandre Julliard Jan 19, 2024
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Showing with 7 additions and 2 deletions

rawinput.c dlls/win32u/rawinput.c +7 -2

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--- a/dlls/win32u/rawinput.c
+++ b/dlls/win32u/rawinput.c
@@ -229,6 +229,7 @@ static struct device *add_device( HKEY key, DWORD type )
    SIZE_T size;
    HANDLE file;
    WCHAR *path;
+    unsigned int i = 0;

    if (!query_reg_value( key, symbolic_linkW, value, sizeof(value_buffer) - sizeof(WCHAR) ))
    {
@@ -237,8 +238,12 @@ static struct device *add_device( HKEY key, DWORD type )
    }
    memset( value->Data + value->DataLength, 0, sizeof(WCHAR) );

-    /* upper case everything but the GUID */
-    for (path = (WCHAR *)value->Data; *path && *path != '{'; path++) *path = towupper( *path );
+    /* upper case everything until the instance ID */
+    for (path = (WCHAR *)value->Data; *path && i < 2; path++)
+    {
+        if (*path == '#') ++i;
+        *path = towupper( *path );
+    }
    path = (WCHAR *)value->Data;

    /* path is in DOS format and begins with \\?\ prefix */