Detecting End-of-File using READLINE command

[John Hemmer]

When using the READLINE command to read sequential records
e.g.

    bytes=READLINE(handle,destination,length)

When a line consists of just a newline character, the number of 
bytes read and returned in "bytes" may be zero. However, there 
could be many records that follow this line.

How can I detect the EOF, End-of-File?  Is a negative number 
of bytes returned?  

None of the Documentation I have, STN Manual, Online FilePro
help, etc,  answers these questions.

TIAA

John 
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