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   fscanf.3p    ( 3 )

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Использование в приложениях (Application usage)

If the application calling fscanf() has any objects of type
       wint_t or wchar_t, it must also include the <wchar.h> header to
       have these objects defined.

       For functions that allocate memory as if by malloc(), the
       application should release such memory when it is no longer
       required by a call to free().  For fscanf(), this is memory
       allocated via use of the 'm' assignment-allocation character.