RE: What's the error?

["Haas, Matt" <Matt.Haas@xxxxxxxxxxxxxxxxxxx>]

Dan,

If character 2048 is an apostrophe, you're telling it to start scanning at 
character 2050. You need to test nPos before your %scan to make sure it isn't 
larger than the length of InString.

Matt

-----Original Message-----
From: Dan [mailto:dbcerpg@yahoo.com]
Sent: Wednesday, January 29, 2003 3:06 PM
To: rpg400-l@midrange.com
Subject: What's the error?


I am having a devil of a time debugging a what should be a simple thing:

    Eval      nPos = %scan(OneQ : InString : nPos ) 

OneQ is defined as a single apostrophe:
    D OneQ     C        Const('''') 

The program blows up on this statement whenever the last non-blank character in 
the InString
variable is an apostrophe, with the following error:

<snip>

     P EnQuote         B
     d EnQuote         PI          4096A   VARYING
     D  InString                   2048A   VALUE VARYING
     D nPos            S              5I 0
     D OneQ            C                   Const('''')
     D TwoQ            C                   Const('''''')
     C                   Eval      nPos = %scan(OneQ:InString)
     C                   Dow       nPos > 0
     C                   Eval      InString = %replace(TwoQ: InString: nPos: 1)
     C                   Eval      nPos = nPos + 2
     C                   Eval      nPos = %scan(OneQ : InString : nPos )
     C                   enddo
     C                   Eval      InString = OneQ + InString + OneQ
     C                   Return    InString
     P                 E

<snip>