[cc65] fwrite disk full detection

Hi there!
I am trying to do some disk I/O using cc65 stdio operations. Target is
C64 + 1541.
I was a bit surprised now that fwrite does not detect disk full. I.e.,

FILE* f = fopen("test", "w");
while(1 == fwrite(0xc000, 100, 1, f));

...will create an infinite loop. Is that a bug, or supposed to work
like that due to hardware limitations?

Regards,
Johan
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