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/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Console\Output;

use Symfony\Component\Console\Formatter\OutputFormatterInterface;

/**
 * ConsoleOutput is the default class for all CLI output. It uses STDOUT and STDERR.
 *
 * This class is a convenient wrapper around `StreamOutput` for both STDOUT and STDERR.
 *
 *     $output = new ConsoleOutput();
 *
 * This is equivalent to:
 *
 *     $output = new StreamOutput(fopen(&#039;php://stdout&#039;, &#039;w&#039;));
 *     $stdErr = new StreamOutput(fopen(&#039;php://stderr&#039;, &#039;w&#039;));
 *
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 */
class ConsoleOutput extends StreamOutput implements ConsoleOutputInterface
{
    private $stderr;

    /**
     * @param int                           $verbosity The verbosity level (one of the VERBOSITY constants in OutputInterface)
     * @param bool|null                     $decorated Whether to decorate messages (null for auto-guessing)
     * @param OutputFormatterInterface|null $formatter Output formatter instance (null to use default OutputFormatter)
     */
    public function __construct(int $verbosity = self::VERBOSITY_NORMAL, bool $decorated = null, OutputFormatterInterface $formatter = null)
    {
        parent::__construct($this-&gt;openOutputStream(), $verbosity, $decorated, $formatter);

        $actualDecorated = $this-&gt;isDecorated();
        $this-&gt;stderr = new StreamOutput($this-&gt;openErrorStream(), $verbosity, $decorated, $this-&gt;getFormatter());

        if (null === $decorated) {
            $this-&gt;setDecorated($actualDecorated &amp;&amp; $this-&gt;stderr-&gt;isDecorated());
        }
    }

    /**
     * {@inheritdoc}
     */
    public function setDecorated($decorated)
    {
        parent::setDecorated($decorated);
        $this-&gt;stderr-&gt;setDecorated($decorated);
    }

    /**
     * {@inheritdoc}
     */
    public function setFormatter(OutputFormatterInterface $formatter)
    {
        parent::setFormatter($formatter);
        $this-&gt;stderr-&gt;setFormatter($formatter);
    }

    /**
     * {@inheritdoc}
     */
    public function setVerbosity($level)
    {
        parent::setVerbosity($level);
        $this-&gt;stderr-&gt;setVerbosity($level);
    }

    /**
     * {@inheritdoc}
     */
    public function getErrorOutput()
    {
        return $this-&gt;stderr;
    }

    /**
     * {@inheritdoc}
     */
    public function setErrorOutput(OutputInterface $error)
    {
        $this-&gt;stderr = $error;
    }

    /**
     * Returns true if current environment supports writing console output to
     * STDOUT.
     *
     * @return bool
     */
    protected function hasStdoutSupport()
    {
        return false === $this-&gt;isRunningOS400();
    }

    /**
     * Returns true if current environment supports writing console output to
     * STDERR.
     *
     * @return bool
     */
    protected function hasStderrSupport()
    {
        return false === $this-&gt;isRunningOS400();
    }

    /**
     * Checks if current executing environment is IBM iSeries (OS400), which
     * doesn&#039;t properly convert character-encodings between ASCII to EBCDIC.
     *
     * @return bool
     */
    private function isRunningOS400()
    {
        $checks = array(
            function_exists(&#039;php_uname&#039;) ? php_uname(&#039;s&#039;) : &#039;&#039;,
            getenv(&#039;OSTYPE&#039;),
            PHP_OS,
        );

        return false !== stripos(implode(&#039;;&#039;, $checks), &#039;OS400&#039;);
    }

    /**
     * @return resource
     */
    private function openOutputStream()
    {
        if (!$this-&gt;hasStdoutSupport()) {
            return fopen(&#039;php://output&#039;, &#039;w&#039;);
        }

        return @fopen(&#039;php://stdout&#039;, &#039;w&#039;) ?: fopen(&#039;php://output&#039;, &#039;w&#039;);
    }

    /**
     * @return resource
     */
    private function openErrorStream()
    {
        return fopen($this-&gt;hasStderrSupport() ? &#039;php://stderr&#039; : &#039;php://output&#039;, &#039;w&#039;);
    }
}
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