Document requirements in README file.

[virt-top.git] / virt-top / virt_top_utils.ml

diff --git a/virt-top/virt_top_utils.ml b/virt-top/virt_top_utils.ml
index 69f442f..c5dc97d 100644 (file)
--- a/virt-top/virt_top_utils.ml
+++ b/virt-top/virt_top_utils.ml
@@ -1,5 +1,5 @@
 (* 'top'-like tool for libvirt domains.
-   (C) Copyright 2007 Richard W.M. Jones, Red Hat Inc.
+   (C) Copyright 2007-2009 Richard W.M. Jones, Red Hat Inc.
    http://libvirt.org/
 
    This program is free software; you can redistribute it and/or modify
@@ -109,10 +109,13 @@ let read_config_file filename =
 
 (* Pad a string to the full width with spaces.  If too long, truncate. *)
 let pad width str =
-  let n = String.length str in
-  if n = width then str
-  else if n > width then String.sub str 0 width
-  else (* if n < width then *) str ^ String.make (width-n) ' '
+  if width <= 0 then ""
+  else (
+    let n = String.length str in
+    if n = width then str
+    else if n > width then String.sub str 0 width
+    else (* if n < width then *) str ^ String.make (width-n) ' '
+  )
 
 module Show = struct
   (* Show a percentage in 4 chars. *)