<?php
/**
 * Copy Right IJH.CC
 * Each engineer has a duty to keep the code elegant
 * Author shzhrui<anhuike@gmail.com>
 * $Id: modifier.cutstr.php 2552 2013-12-26 09:25:36Z langzhong $
 */

if(!defined('__CORE_DIR')){
    exit("Access Denied");
}

function smarty_modifier_cutstr($string, $length, $dot = ' ...')
{   
    $slen = strlen($string);
	if($slen <= $length) {
		return $string;
	}
	$pre = chr(1);
	$end = chr(1);
	$string = str_replace(array('&amp;', '&quot;', '&lt;', '&gt;'), array($pre.'&'.$end, $pre.'"'.$end, $pre.'<'.$end, $pre.'>'.$end), $string);

	$strcut = '';
	if(strtoupper(Smarty::$_CHARSET) == 'UTF-8') {
		$n = $tn = $noc = 0;
		while($n < strlen($string)) {
			$t = ord($string[$n]);
			if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
				$tn = 1; $n++; $noc++;
			} elseif(194 <= $t && $t <= 223) {
				$tn = 2; $n += 2; $noc += 2;
			} elseif(224 <= $t && $t <= 239) {
				$tn = 3; $n += 3; $noc += 2;
			} elseif(240 <= $t && $t <= 247) {
				$tn = 4; $n += 4; $noc += 2;
			} elseif(248 <= $t && $t <= 251) {
				$tn = 5; $n += 5; $noc += 2;
			} elseif($t == 252 || $t == 253) {
				$tn = 6; $n += 6; $noc += 2;
			} else {
				$n++;
			}

			if($noc >= $length) {
				break;
			}

		}
		if($noc > $length) {
			$n -= $tn;
		}else if($noc == $length && $n < $slen){
            $n -= $tn;
        }

		$strcut = substr($string, 0, $n);

	} else {
		for($i = 0; $i < $length; $i++) {
			$strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
		}
	}

	$strcut = str_replace(array($pre.'&'.$end, $pre.'"'.$end, $pre.'<'.$end, $pre.'>'.$end), array('&amp;', '&quot;', '&lt;', '&gt;'), $strcut);

	$pos = strrpos($strcut, chr(1));
	if($pos !== false) {
		$strcut = substr($strcut,0,$pos);
	}
    if($string == $strcut){
        return $strcut;
    }
	return $strcut.$dot;
}