urisprintf.php
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	<?php

	/**
	* Format a URI. This function behaves like `sprintf`, except that all the
	* normal conversions (like "%s") will be properly escaped, and additional
	* conversions are supported:
	*
	* %s (String)
	* Escapes text for use in a URI.
	*
	* %p (Path Component)
	* Escapes text for use in a URI path component.
	*
	* %R (Raw String)
	* Inserts raw, unescaped text. DANGEROUS!
	*/
	function urisprintf($pattern /* , ... */) {
	$args = func_get_args();
	return xsprintf('xsprintf_uri', null, $args);
	}

	function vurisprintf($pattern, array $argv) {
	array_unshift($argv, $pattern);
	return call_user_func_array('urisprintf', $argv);
	}

	/**
	* @{function:urisprintf} callback for URI encoding.
	*/
	function xsprintf_uri($userdata, &$pattern, &$pos, &$value, &$length) {
	$type = $pattern[$pos];

	switch ($type) {
	case 's':
	$value = phutil_escape_uri($value);
	$type = 's';
	break;

	case 'p':
	$value = phutil_escape_uri_path_component($value);
	$type = 's';
	break;

	case 'R':
	$type = 's';
	break;
	}

	$pattern[$pos] = $type;
	}