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page: improve shortname()

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

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

@@ -258,9 +258,14 @@

 shortname(char *s)

 {

 	char *x;

-	if(x = strrchr(s, '/'))

-		if(x[1] != 0)

-			return x+1;

+

+	while(strlen(s) > 20){

+		if((x = strchr(s, '/')) == nil)

+			break;

+		if(x[1] == 0)

+			break;

+		s = x+1;

+	}

 	return s;

 }

-- 

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