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atazz: fix %.*s format in special command processing

--- a/sys/src/cmd/atazz/main.c

+++ b/sys/src/cmd/atazz/main.c

@@ -1463,7 +1463,7 @@

 	for(t = s; *t == '<' || *t == '>'; t++)

 		;

 	if(t != s)

-		snprint(sbuf, sizeof buf, "%.*s %s", (int)(t - s), s, t);

+		snprint(sbuf, sizeof buf, "%.*s %s", utfnlen(s, t - s), s, t);

 	else

 		snprint(sbuf, sizeof sbuf, "%s", s);

 	nf = tokenize(sbuf, f, nelem(f));