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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* Specialized String Functions for phpMyAdmin
*
* Copyright 2002 Robin Johnson <robbat2@users.sourceforge.net>
* http://www.orbis-terrarum.net/?l=people.robbat2
*
* Defines a set of function callbacks that have a pure C version available if
* the "ctype" extension is available, but otherwise have PHP versions to use
* (that are slower).
*
* The SQL Parser code relies heavily on these functions.
*
* @version $Id$
* @uses extension_loaded()
* @uses substr()
* @uses function_exists()
* @uses mb_internal_encoding()
* @uses defined()
* @todo a .lib filename should not have code in main(), split or rename file
* @package phpMyAdmin
*/
if (! defined('PHPMYADMIN')) {
exit;
}
$GLOBALS['PMA_allow_mbstr'] = @function_exists('mb_strlen');
$GLOBALS['PMA_allow_ctype'] = @extension_loaded('ctype');
if ($GLOBALS['PMA_allow_mbstr']) {
mb_internal_encoding($GLOBALS['charset']);
}
/**
* Load proper code for handling input.
*/
if (defined('PMA_MULTIBYTE_ENCODING') || $GLOBALS['PMA_allow_mbstr']) {
$GLOBALS['PMA_strpos'] = 'mb_strpos';
$GLOBALS['PMA_substr'] = 'mb_substr';
require './libraries/string_mb.lib.php';
} else {
$GLOBALS['PMA_strpos'] = 'strpos';
$GLOBALS['PMA_substr'] = 'substr';
require './libraries/string_native.lib.php';
}
/**
* Load ctype handler.
*/
if ($GLOBALS['PMA_allow_ctype']) {
$GLOBALS['PMA_STR_isAlnum'] = 'ctype_alnum';
$GLOBALS['PMA_STR_isDigit'] = 'ctype_digit';
$GLOBALS['PMA_STR_isSpace'] = 'ctype_space';
require './libraries/string_type_ctype.lib.php';
} else {
$GLOBALS['PMA_STR_isAlnum'] = 'PMA_STR_isAlnum';
$GLOBALS['PMA_STR_isDigit'] = 'PMA_STR_isDigit';
$GLOBALS['PMA_STR_isSpace'] = 'PMA_STR_isSpace';
require './libraries/string_type_native.lib.php';
}
/**
* Checks if a given character position in the string is escaped or not
*
* @uses PMA_strlen()
* @uses PMA_substr()
* @uses max()
* @uses intval()
* @param string string to check for
* @param integer the character to check for
* @param integer starting position in the string
* @return boolean whether the character is escaped or not
*/
function PMA_STR_charIsEscaped($string, $pos, $start = 0)
{
$pos = max(intval($pos), 0);
$start = max(intval($start), 0);
$len = PMA_strlen($string);
// Base case:
// Check for string length or invalid input or special case of input
// (pos == $start)
if ($pos <= $start || $len <= max($pos, $start)) {
return false;
}
$pos--;
$escaped = false;
while ($pos >= $start && PMA_substr($string, $pos, 1) == '\\') {
$escaped = !$escaped;
$pos--;
} // end while
return $escaped;
} // end of the "PMA_STR_charIsEscaped()" function
/**
* Checks if a number is in a range
*
* @param integer number to check for
* @param integer lower bound
* @param integer upper bound
* @return boolean whether the number is in the range or not
*/
function PMA_STR_numberInRangeInclusive($num, $lower, $upper)
{
return ($num >= $lower && $num <= $upper);
} // end of the "PMA_STR_numberInRangeInclusive()" function
/**
* Checks if a character is an SQL identifier
*
* @uses PMA_STR_isAlnum()
* @param string character to check for
* @param boolean whether the dot character is valid or not
* @return boolean whether the character is an SQL identifier or not
*/
function PMA_STR_isSqlIdentifier($c, $dot_is_valid = false)
{
return ($GLOBALS['PMA_STR_isAlnum']($c)
|| ($ord_c = ord($c)) && $ord_c >= 192 && $ord_c != 215 && $ord_c != 249
|| $c == '_'
|| $c == '$'
|| ($dot_is_valid != false && $c == '.'));
} // end of the "PMA_STR_isSqlIdentifier()" function
/**
* Binary search of a value in a sorted array
*
* $arr MUST be sorted, due to binary search
*
* @param string string to search for
* @param array sorted array to search into
* @param integer size of sorted array to search into
*
* @return boolean whether the string has been found or not
*/
function PMA_STR_binarySearchInArr($str, $arr, $arrsize)
{
$top = $arrsize - 1;
$bottom = 0;
$found = false;
while ($top >= $bottom && $found == false) {
$mid = intval(($top + $bottom) / 2);
$res = strcmp($str, $arr[$mid]);
if ($res == 0) {
$found = true;
} elseif ($res < 0) {
$top = $mid - 1;
} else {
$bottom = $mid + 1;
}
} // end while
return $found;
} // end of the "PMA_STR_binarySearchInArr()" function
?>
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