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csprintf.php
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Wed, Dec 4, 20:08

csprintf.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Format a shell command string. This function behaves like sprintf(), except
* that all the normal conversions (like %s) will be properly escaped, and
* additional conversions are supported:
*
* %C (Raw Command)
* Passes the argument through without escaping. Dangerous!
*
* Generally, you should invoke shell commands via execx() rather than by
* calling csprintf() directly.
*
* @param string sprintf()-style format string.
* @param ... Zero or more arguments.
* @return string Formatted string, escaped appropriately for shell contexts.
*/
function csprintf($pattern/*, ... */) {
$args = func_get_args();
return xsprintf('xsprintf_command', null, $args);
}
/**
* Version of csprintf() that takes a vector of arguments.
*
* @param string sprintf()-style format string.
* @param list List of zero or more arguments to csprintf().
* @return string Formatted string, escaped appropriately for shell contexts.
*/
function vcsprintf($pattern, array $argv) {
array_unshift($argv, $pattern);
return call_user_func_array('csprintf', $argv);
}
/**
* xsprintf() callback for csprintf().
*/
function xsprintf_command($userdata, &$pattern, &$pos, &$value, &$length) {
$type = $pattern[$pos];
$next = (strlen($pattern) > $pos + 1) ? $pattern[$pos + 1] : null;
switch ($type) {
case 'L':
// Only '%Ls' is supported.
if ($next !== 's') {
throw new Exception("Unknown conversion %L{$next}.");
}
// Remove the L, leaving %s
$pattern = substr_replace($pattern, '', $pos, 1);
$length = strlen($pattern);
$type = 's';
// Check that the value is a non-empty array.
if (!is_array($value) || !$value) {
throw new Exception("Expected a non-empty array for %Ls conversion.");
}
// Convert the list of strings to a single string.
$value = implode(' ', array_map('escapeshellarg', $value));
break;
case 's':
$value = escapeshellarg($value);
$type = 's';
break;
case 'C':
$type = 's';
break;
}
$pattern[$pos] = $type;
}

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