[Chicken-janitors] #664: simple-sha1's sha1sum segfaults when passed a directory

[Chicken Trac]

#664: simple-sha1's sha1sum segfaults when passed a directory
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 Reporter:  ckeen                             |       Owner:  felix
     Type:  defect                            |      Status:  new  
 Priority:  major                             |   Milestone:  4.8.0
Component:  extensions                        |     Version:  4.7.x
 Keywords:  sha1sum segfault save-the-robots  |  
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 When passing a nonexistent path to sha1sum file-open returns an error.
 However if the programmer is stupid and passes a directory to sha1sum it
 segfaults due to the mmaping stuff.

 The attached patch changes the sha1sum behaviour to return #f on a
 nonexistant file or being passed a directory.

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Ticket URL: <http://bugs.call-cc.org/ticket/664>
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