[Chicken-janitors] #300: allow reading without "hanging"

[Chicken Trac]

#300: allow reading without "hanging"
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 Reporter:  felix                |       Owner:       
     Type:  enhancement          |      Status:  new  
 Priority:  minor                |   Milestone:       
Component:  core libraries       |     Version:  4.5.x
 Keywords:  read-string no-hang  |  
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 (suggested by Alejandro)

 It would be nice to have a "read as much of input as is currently
 available" type of `read-string[!]`, say,

   (read-string/no-hang NUM [PORT]) -> STRING (may be shorter than NUM)
   (read-string!/no-hang NUM STRING [PORT [START]]) -> NUM'

 This could probably be implemented using another port method, defaulting
 to `char-ready?` + `read-char`.

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Ticket URL: <http://www.irp.oist.jp/trac/chicken/ticket/300>
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