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Expand file tree Collapse file tree Original file line number Diff line number Diff line change @@ -854,7 +854,12 @@ wchar_t Support
854854 Copy the Unicode object contents into the :c:type: `wchar_t ` buffer *wstr *. At most
855855 *size * :c:type: `wchar_t ` characters are copied (excluding a possibly trailing
856856 null termination character). Return the number of :c:type:`wchar_t` characters
857- copied or ``-1`` in case of an error. Note that the resulting :c:expr:`wchar_t*`
857+ copied or ``-1`` in case of an error.
858+
859+ When *wstr* is ``NULL``, instead return the *size* that would be required
860+ to store all of *unicode* including a terminating null.
861+
862+ Note that the resulting :c:expr:`wchar_t*`
858863 string may or may not be null-terminated. It is the responsibility of the caller
859864 to make sure that the :c:expr:`wchar_t*` string is null-terminated in case this is
860865 required by the application. Also, note that the :c:expr:`wchar_t*` string
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