40 lines
1010 B
Awk
40 lines
1010 B
Awk
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#!/bin/awk -f
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BEGIN {
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hextab ["0"] = 0; hextab ["8"] = 8;
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hextab ["1"] = 1; hextab ["9"] = 9;
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hextab ["2"] = 2; hextab ["A"] = hextab ["a"] = 10
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hextab ["3"] = 3; hextab ["B"] = hextab ["b"] = 11;
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hextab ["4"] = 4; hextab ["C"] = hextab ["c"] = 12;
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hextab ["5"] = 5; hextab ["D"] = hextab ["d"] = 13;
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hextab ["6"] = 6; hextab ["E"] = hextab ["e"] = 14;
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hextab ["7"] = 7; hextab ["F"] = hextab ["f"] = 15;
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}
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{
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decoded = ""
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i = 1
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len = length ($0)
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while ( i <= len ) {
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c = substr ($0, i, 1)
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if ( c == "%" ) {
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if ( i+2 <= len ) {
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c1 = substr ($0, i+1, 1)
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c2 = substr ($0, i+2, 1)
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if ( hextab [c1] == "" || hextab [c2] == "" ) {
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print "WARNING: invalid hex encoding: %" c1 c2 | "cat >&2"
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} else {
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code = 0 + hextab [c1] * 16 + hextab [c2] + 0
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c = sprintf ("%c", code)
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i = i + 2
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}
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} else {
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print "WARNING: invalid % encoding: " substr ($0, i, len - i)
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}
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} else if ( c == "+" ) {
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c = " "
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}
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decoded = decoded c
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++i
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}
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print decoded
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}
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