// From http://jan.moesen.nu/
// Found at http://jan.moesen.nu/code/javascript/sprintf-and-printf-in-javascript/
function sprintf()
{
    if (!arguments || arguments.length < 1 || !RegExp)
    {
	return;
    }
    var str = arguments[0];
    var re = /([^%]*)%('.|0|\x20)?(-)?(\d+)?(\.\d+)?(%|b|c|d|u|f|o|s|x|X)(.*)/; // '
    var a = b = [], numSubstitutions = 0, numMatches = 0;
    while (a = re.exec(str))
    {
	var leftpart = a[1], pPad = a[2], pJustify = a[3], pMinLength = a[4];
	var pPrecision = a[5], pType = a[6], rightPart = a[7];
	
	//alert(a + '\n' + [a[0], leftpart, pPad, pJustify, pMinLength, pPrecision);

	numMatches++;
	if (pType == '%')
	{
	    subst = '%';
	}
	else
	{
	    numSubstitutions++;
	    if (numSubstitutions >= arguments.length)
	    {
		alert('Error! Not enough function arguments (' + (arguments.length - 1) + ', excluding the string)\nfor the number of substitution parameters in string (' + numSubstitutions + ' so far).');
	    }
	    var param = arguments[numSubstitutions];
	    var pad = '';
	    if (pPad && pPad.substr(0,1) == "'") pad = leftpart.substr(1,1);
	    else if (pPad) pad = pPad;
	    var justifyRight = true;
	    if (pJustify && pJustify === "-") justifyRight = false;
	    var minLength = -1;
	    if (pMinLength) minLength = parseInt(pMinLength);
	    var precision = -1;
	    if (pPrecision && pType == 'f') precision = parseInt(pPrecision.substring(1));
	    var subst = param;
	    if (pType == 'b') subst = parseInt(param).toString(2);
	    else if (pType == 'c') subst = String.fromCharCode(parseInt(param));
	    else if (pType == 'd') subst = parseInt(param) ? parseInt(param) : 0;
	    else if (pType == 'u') subst = Math.abs(param);
	    else if (pType == 'f') subst = (precision > -1) ? Math.round(parseFloat(param) * Math.pow(10, precision)) / Math.pow(10, precision): parseFloat(param);
	    else if (pType == 'o') subst = parseInt(param).toString(8);
	    else if (pType == 's') subst = param;
	    else if (pType == 'x') subst = ('' + parseInt(param).toString(16)).toLowerCase();
	    else if (pType == 'X') subst = ('' + parseInt(param).toString(16)).toUpperCase();
	}
	str = leftpart + subst + rightPart;
    }
    return str;
}
