From the manual page.
My bad. But provided you understand what that says you should know what to do now. Just read until nothing is converted.
These functions return the number of input items assigned,
which can be fewer than provided for, or even zero, in the
event of a matching failure. Zero indicates that, while
there was input available, no conversions were assigned;
typically this is due to an invalid input character, such
as an alphabetic character for a `%d' conversion. The
value EOF is returned if an input failure occurs before
any conversion such as an end-of-file occurs. If an error
or end-of-file occurs after conversion has begun, the num-
ber of conversions which were successfully completed is
This looks like
while ( (currentCharacter = fscanf( /** ... **/ ) ) == 1 )
currentCharacter now contains the sum of successful conversions.