<?php

function php_chdir($dir) {
	$ret = chdir($dir);
	echo '<input type="hidden" name="d" value="'.getcwd().'" />';
	return $ret;
}

abstract class prog { public static abstract function main($args, $env); }

function php_exec($com, $cwd='') {
	if ($cwd != '') { php_chdir($cwd); }
	if ($com=='') { return 0; }

	$root = dirname(__FILE__);

	$ifs=' 	';
	$path = $root.'/bin';

	$env = array('IFS' => $ifs, 'PATH' => $path);

	$coms = array(); $stdout_dest = array();
	$a = 0;
	$c = 0;
	$q = '';
	while ($com != '') {
		$char = substr($com,0,1);
		 $com = substr($com,1);
		      if (substr_count ('\'',$char)!==0) {
			if (substr($q,0,1)===$char) {
				$q = substr($q,1);
			} else {
				$q = $char.$q;
			}
		} elseif ($q != '') {
			$coms[$c][$a].=$char;
		} elseif (substr_count ($ifs,$char)!==0) {
			if (isset($coms[$c][$a])) {
				$a++;
			}
		} elseif (substr_count (';',$char)!==0) {
			$stdout_dest[$c] = '/dev/stdout';
			$c++; $a=0;
		} elseif (substr_count ('|',$char)!==0) {
			$stdout_dest[$c] = '/dev/stdin';
			$c++; $a=0;
		} else {
			$coms[$c][$a].=$char;
		}
	}
	if (!isset($stdout_dest[$c])) {
		$stdout_dest[$c] = '/dev/stdout';
	}
	
	$ret=0;
	if (!isset($_POST['stdin'])) { $_POST['stdin']=''; }
	foreach ($coms as $key => $args) {
		if ($stdout_dest[$key] != '/dev/stdout') {
			ob_start();
		}
		if (!class_exists('p_'.$args[0])) {
			$file=$path.'/'.$args[0].'.php';
			if (file_exists($file)) {
				include($file);
			}
		}
		if (class_exists('p_'.$args[0])) {
			$ret = call_user_func(array('p_'.$args[0],'main'),$args,$env);//main($args,$env);
		} else {
			echo 'sh: command not found: `'.$args[0]."'\n";
			$ret = 1;
		}
		if ($stdout_dest[$key] != '/dev/stdout') {
			switch ($stdout_dest[$key]) {
				case '/dev/stdin': $_POST['stdin']=ob_get_contents(); break;
				default: file_put_contents($stdout_dest[$key],ob_get_contents()); break;
			}
			ob_end_clean();
		}
	}
	return $ret;
}