#ifndef _NTRTL_H
/**
* The RtlUpcaseUnicodeChar routine converts the specified Unicode character to uppercase.
*
* \param[in] SourceCharacter Specifies the character to convert.
* \return The uppercase version of the specified Unicode character.
* \sa https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/nf-wdm-rtlupcaseunicodechar
*/
NTSYSAPI
WCHAR
NTAPI
RtlUpcaseUnicodeChar(
_In_ WCHAR SourceCharacter
);
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This function is documented in Windows Driver Kit.