pack_feof
Returns nonzero as soon as you reach the end of the file.
Description
Finds out if you have reached the end of the file. It does not wait for you
to attempt to read beyond the end of the file, contrary to the ISO C feof()
function. The only way to know whether you have read beyond the end of the
file is to check the return value of the read operation you use (and be
wary of pack_*getl() as EOF is also a valid return value with these
functions).
Returns non-zero if you are at the end of the file, zero otherwise.
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