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     The fwrite function writes up to <count> items, each of <length>
     size, from <buffer> to the output stream. The file pointer
     associated with <stream> (if there is one) is incremented by the
     number of bytes actually written.
 
     If <stream> is opened in text mode, each carriage return is
     replaced with a carriage-return──line-feed pair. The replacement
     has no effect on the return value.
 
     Return Value
 
     The fwrite function returns the number of full items actually
     written, which may be less than <count> if an error occurs. Also,
     if an error occurs, the file-position indicator cannot be
     determined.
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