Re: #1835: Error in the utf8 egg's substring=?

[Chicken Trac]

#1835: Error in the utf8 egg's substring=?
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            Reporter:  siiky       |      Owner:  siiky
                Type:  defect      |     Status:  reopened
            Priority:  major       |  Milestone:  someday
           Component:  extensions  |    Version:  5.4.0
          Resolution:              |   Keywords:  utf8
Estimated difficulty:              |
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Changes (by siiky):

 * status:  closed => reopened
 * resolution:  fixed =>


Comment:

 {{{(substring=? "" "" 0 0 0)}}} results in a range error too. Sorry I
 forgot to update this ticket the other day.

 I believe the problem is in the lines {{{(##sys#check-range start1 0
 (##sys#size s1) 'substring=?)}}}, when the string is empty -- it amounts
 to {{{##sys#check-range 0 0 0 'substring=?)}}}.

 I can't tell what the obvious fix is, if there is one. Return {{{#t}}} if
 one of the strings is empty?

-- 
Ticket URL: <https://bugs.call-cc.org/ticket/1835#comment:2>
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