RtlExpandEnvironmentStrings_U - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTRTL_H

NTSYSAPI
NTSTATUS
NTAPI
RtlExpandEnvironmentStrings_U(
    _In_opt_ PVOID Environment,
    _In_ PCUNICODE_STRING Source,
    _Inout_ PUNICODE_STRING Destination,
    _Out_opt_ PULONG ReturnedLength
    );

#endif

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NTinternals.net (undocumented.ntinternals.net)

Environment

Pointer to environment block.

SourceString

Pointer to UNICODE_STRING structure with text. If text contains any environment variable name separated with '%' character, variable name is replaced by value of this variable.

DestinationString

Result of above operation. At input only MaximumLength of UNICODE_STRING structure must be valid.

DestinationBufferLength

If you don't know, how long should be result buffer, use value at DestinationBufferLength pointer.

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