[Chicken-janitors] #428: Escape control characters in printed representation of symbols

[Chicken Trac]

#428: Escape control characters in printed representation of symbols
----------------------------+-----------------------------------------------
 Reporter:  alaric          |       Owner:       
     Type:  defect          |      Status:  new  
 Priority:  minor           |   Milestone:  4.7.0
Component:  core libraries  |     Version:  4.6.0
 Keywords:                  |  
----------------------------+-----------------------------------------------
 {{{
 #;2> (with-output-to-string (lambda () (write (string->symbol (string-
 append "5" "\x00")))))
 "|5\x00|"
 }}}

 NB: That `\x00` in the output is due to the string being escaped, not the
 control character in the symbol being escaped.

 This problem is particularly painful when one outputs the symbol direct to
 the terminal, where the `\x00` just disappears:

 {{{
 #;5> (write (string->symbol "5\x00"))
 |5|#;6>
 }}}

 ...and one then spends ages tearing one's hair out as to what's wrong!

-- 
Ticket URL: <http://bugs.call-cc.org/ticket/428>
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Chicken Scheme is a compiler for the Scheme programming language.