win32u: Allow drivers to set the null user driver.

Allow passing NULL as the user driver to __wine_set_user_driver(), to set the internal null user driver. This is useful for drivers that may need to tentatively set their own user driver during setup and reset it on failure. Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>

win32u: Allow drivers to set the null user driver.
243c1909 · Alexandros Frantzis · Alexandre Julliard · 50c1b197 · 243c1909
Commit 243c1909 authored Feb 28, 2023 by Alexandros Frantzis Committed by Alexandre Julliard Mar 16, 2023
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driver.c dlls/win32u/driver.c +1 -1

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--- a/dlls/win32u/driver.c
+++ b/dlls/win32u/driver.c
@@ -1241,7 +1241,7 @@ void __wine_set_user_driver( const struct user_driver_funcs *funcs, UINT version
    }

    driver = malloc( sizeof(*driver) );
-    *driver = *funcs;
+    *driver = funcs ? *funcs : null_user_driver;

 #define SET_USER_FUNC(name) \
    do { if (!driver->p##name) driver->p##name = nulldrv_##name; } while(0)