I disagree about printf() errors.
With normal file operations, what I said is true. It is almost impossible for a print or printf to "fail" once a local Hard Disk file handle is open. One way would be "File system full", but in that case, a fatal exception is thrown - the calling program won't see that.
I did make a mistake in interpreting the exact situation. I would have written: return sprintf "..." because I favor explicit return statements.
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