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`feof'--test for end of file

     #include <stdio.h>
     int feof(FILE *FP);
`feof' tests whether or not the end of the file identified by FP has
been reached.
`feof' returns `0' if the end of file has not yet been reached; if at
end of file, the result is nonzero.
`feof' is required by ANSI C.
   No supporting OS subroutines are required.