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aux/depend: fix %.*s format in path concatenation

--- a/sys/src/cmd/aux/depend.c

+++ b/sys/src/cmd/aux/depend.c

@@ -1379,7 +1379,9 @@

 	f->use++;

 	if(f->fd < 0){

 		name = strrchr(df->path, '/') + 1;

-		n = snprint(path, sizeof path, "%.*s/%s", (int)(name-df->path), df->path, f->name);

+		n = snprint(path, sizeof path, "%.*s/%s", 

+			utfnlen(df->path, name-df->path), df->path,

+			f->name);

 		if(n >= sizeof path - UTFmax){

 			syslog(0, dependlog, "path name too long: %.20s.../%.20s...", df->path, f->name);

 			return -1;

-- 

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