add /rc/bin/urlencode

rc/bin/urlencode

@@ -0,0 +1,36 @@
+#!/bin/awk -f
+BEGIN {
+# We assume an awk implementation that is just plain dumb.
+# We will convert an character to its ASCII value with the
+# table ord[], and produce two-digit hexadecimal output
+# without the printf("%02X") feature.
+
+EOL = "%0A"	# "end of line" string (encoded)
+split ("1 2 3 4 5 6 7 8 9 A B C D E F", hextab, " ")
+hextab [0] = 0
+for ( i=1; i<=255; ++i ) ord [ sprintf ("%c", i) "" ] = i + 0
+}
+{
+encoded = ""
+for ( i=1; i<=length ($0); ++i ) {
+	c = substr ($0, i, 1)
+	if ( c ~ /[a-zA-Z0-9.-]/ ) {
+	encoded = encoded c	# safe character
+	} else if ( c == " " ) {
+	encoded = encoded "+"	# special handling
+	} else {
+	# unsafe character, encode it as a two-digit hex-number
+	lo = ord [c] % 16
+	hi = int (ord [c] / 16);
+	encoded = encoded "%" hextab [hi] hextab [lo]
+	}
+}
+if ( EncodeEOL ) {
+	printf ("%s", encoded EOL)
+} else {
+	print encoded
+}
+}
+END {
+	#if ( EncodeEOL ) print ""
+}