svn commit: r270035 - stable/10/lib/libc/stdio

[Andrey Chernov]

On 16.08.2014 5:29, Pedro F. Giffuni wrote:
> Author: pfg
> Date: Sat Aug 16 01:29:49 2014
> New Revision: 270035
> URL: http://svnweb.freebsd.org/changeset/base/270035
> 
> Log:
>   MFC	r268924:
>   Update fflush(3) to return success on a read-only stream.
>   
>   This is done for compliance with SUSv3. The changes cause
>   no secondary effects in the gnulib tests (we pass them).
...
> @@ -122,6 +123,12 @@ __sflush(FILE *fp)
>  	for (; n > 0; n -= t, p += t) {
>  		t = _swrite(fp, (char *)p, n);
>  		if (t <= 0) {
> +			/* Reset _p and _w. */
> +			if (p > fp->_p)	/* Some was written. */
> +				memmove(fp->_p, p, n);
> +			fp->_p += n;
> +			if ((fp->_flags & (__SLBF | __SNBF)) == 0)
> +				fp->_w -= n;
>  			fp->_flags |= __SERR;
>  			return (EOF);
>  		}
> 

The description is incomplete. This code also does internal stdio
structure adjustment for partial write.

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