[FreeRTOS+FAT Standard API Reference]
int ff_fseek( FF_FILE *pxStream, int iOffset, int iWhence );
Moves the current read/write position of an open file to ( iWhence + iOffset ).
The file in which the current read/write position is
An offset (in bytes) from the position set by the iWhence
parameter to which the file’s current read/write position
will be set.
The position within the file from which the iOffset value
is relative. Valid values for iWhence include:
On success 0 is returned.
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