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Message: [QUOTE="Eric Sosman, post: 2438998"] You get a different interpretation if you regard buf as a zero-terminated string than if you regard it as an array of nread characters. In particular, if buf lacks a zero terminator it is not a proper string, and passing it to fprintf() invokes undefined behavior. (A likely result is that fprintf() will "run off the end" of buf until it stumbles upon a zero byte somewhere else in memory; you are probably seeing the characters that precede that zero.) Also, if '%' appears anywhere in buf, fprintf() will try to interpret it as a formatting directive ... Your best bet is to use fwrite(), as you apparently intend to do eventually in any case. [/QUOTE]