Путеводитель по Руководству Linux

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   fwscanf.3p    ( 3 )

ввод символов (character input)

Возвращаемое значение (Return value)

Upon successful completion, these functions shall return the number of successfully matched and assigned input items; this number can be zero in the event of an early matching failure. If the input ends before the first conversion (if any) has completed, and without a matching failure having occurred, EOF shall be returned. If an error occurs before the first conversion (if any) has completed, and without a matching failure having occurred, EOF shall be returned and errno shall be set to indicate the error. If a read error occurs, the error indicator for the stream shall be set.