/*
 * sprintf string formatting, like C/perl/PHP
 *
 * Original from:
 *   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, 10);
			var precision = -1;
							if (pPrecision && pType == 'f') precision = parseInt(pPrecision.substring(1), 10);
			var subst = param;
							if (pType == 'b') subst = parseInt(param, 10).toString(2);
				else if (pType == 'c') subst = String.fromCharCode(parseInt(param, 10));
				else if (pType == 'd') subst = parseInt(param, 10) ? parseInt(param, 10) : 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, 10).toString(8);
				else if (pType == 's') subst = param;
				else if (pType == 'x') subst = ('' + parseInt(param, 10).toString(16)).toLowerCase();
				else if (pType == 'X') subst = ('' + parseInt(param, 10).toString(16)).toUpperCase();
		}
		if (minLength > 0) {
			subst = subst + '';
			var pad = pPad === '0' ? '0' : ' ';
			while (subst.length < minLength) {
				subst = pad + subst;
			}
		}
		str = leftpart + subst + rightPart;
	}
	return str;
}