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urlencode: encode null bytes

--- a/sys/src/cmd/urlencode.c

+++ b/sys/src/cmd/urlencode.c

@@ -80,7 +80,7 @@

 		}

 	} else {

 		while((c = Bgetc(&bin)) >= 0){

-			if(strchr("/$-_@.!*'(),", c)

+			if(c>0 && strchr("/$-_@.!*'(),", c)

 			|| 'a'<=c && c<='z'

 			|| 'A'<=c && c<='Z'

 			|| '0'<=c && c<='9')

-- 

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