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unicode: use Runeerror

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

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

@@ -85,9 +85,13 @@

 		q = *argv;

 		while(*q){

 			w = chartorune(&r, q);

-			if(r==0x80 && (q[0]&0xFF)!=0x80){

-				fprint(2, "unicode: invalid utf string %s\n", *argv);

-				return "bad utf";

+			if(r==Runeerror){

+				char b[UTFmax];

+

+				if(runetochar(b, &r) != w || memcmp(b, q, w) != 0){

+					fprint(2, "unicode: invalid utf string %s\n", *argv);

+					return "bad utf";

+				}

 			}

 			Bprint(&bout, "%.4x\n", r);

 			q += w;

-- 

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