[PATCH][BZ #11741] printf should return negative value on I/O error

[Siddhesh Poyarekar]

On Fri, 19 Oct 2012 13:48:20 +0200, Andreas wrote:
> What's the significance of w == 0?  sputn should return either the
> amount of written bytes or EOF.

sputn can return 0 if none of the input bytes were written into buffer
and the overflow failed.  I wasn't sure if this behaviour was
expected, but I assume now that it isn't.  Here's an updated patch with
sputn also fixed.

Thanks,
Siddhesh

ChangeLog:

	[BZ #11741]
	* libio/fileops.c (_IO_new_file_write): Correctly return error.
	(_IO_new_file_xsputn): Also return EOF if none of the input
	data was written when overflow failed.
	* libio/iopadn.c (_IO_padn): Likewise.
	* libio/iowpadn.c (_IO_wpadn): Likewise.
	* stdio-common/tst-put-error.c: Add copyright notice.
	(do_test): Add case for printing padded string.
	* stdio-common/vfprintf [!COMPILE_WPRINTF] (PAD): Flag error if
	_IO_padn returned error.
	[COMPILE_WPRINTF] (PAD): Flag error if _IO_wpadn returned error.
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