#! /usr/bin/awk -f
#
#	decode "application/x-www-form-urlencoded" data
#	written by Yasha, public domain
#

BEGIN	{
		# make hexadecimal table
		h["0"] = 0; h["1"] = 1; h["2"] = 2; h["3"] = 3; h["4"] = 4;
		h["5"] = 5; h["6"] = 6; h["7"] = 7; h["8"] = 8; h["9"] = 9;

		h["A"] = 10; h["B"] = 11; h["C"] = 12; h["D"] = 13;
		h["E"] = 14; h["F"] = 15;

		h["a"] = 10; h["b"] = 11; h["c"] = 12; h["d"] = 13;
		h["e"] = 14; h["f"] = 15;
	}

/[+%]/	{
		for (i = 1; i <= length; i++) {
			c = substr($0, i, 1);
			if (c == "%") {
				c1 = substr($0, i+1, 1);
				c2 = substr($0, i+2, 1);
				printf "%c", h[c1] * 16 + h[c2];
				i += 2;
			} else if (c == "+") {
				printf " "
			} else
				printf "%s", c
		}
		print "";
		next
	}

	{	print	}