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On Thu 8 Sep 2011, at 11:47, steve donovan wrote:
> I assumed that it did, thanks for correcting that.  The portable C way
> is to check what the number of bytes which fwrite returns.

In my tests (on Mac OS X) fprintf() writing to a FILE* stream open for reading returns a successful result, but errno and the ferror() flag are set.

f.anthony.n.finch  <>