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Date:	Wed, 27 Jun 2018 20:01:16 +0900
From:	Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
To:	cygwin AT cygwin DOT com
Subject:	perror() changes the orientation of stderr to byte-oriented mode if stderr is not oriented yet.
Message-Id:	<20180627200116.ddd80f78597f8fd3f09d5d4b@nifty.ne.jp>
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POSIX states:
The perror() function shall not change the orientation of the standard
error stream.

However, cygwin perror() function changes the orientation of stderr to
byte-oriented mode if stderr is not oriented yet.

Simple test case (chkperror.c) attached checks this behavior.

Expected result:
0
äöü: Invalid argument
0
äöü
1
äöü: Invalid argument

However, cygwin result:
0
äöü: Invalid argument
-1
â–’â–’â–’
-1
äöü: Invalid argument

I have made a patch to solve this problem, attached. However, I am not
sure that calling _write_r() here is correct manner. I will appreciate
if anyone familiar with libc code comment or make suggestions.

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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#include <stdio.h>
#include <wchar.h>
#include <locale.h>
#include <errno.h>

int main()
{
	setlocale(LC_CTYPE, "de_DE.UTF-8");
	errno =3D EINVAL;
	printf("%d\n", fwide(stderr, 0));
	perror("=C3=A4=C3=B6=C3=BC");
	printf("%d\n", fwide(stderr, 0));
	fwprintf(stderr, L"=C3=A4=C3=B6=C3=BC\n");
	printf("%d\n", fwide(stderr, 0));
	perror("=C3=A4=C3=B6=C3=BC");
	return 0;
}


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