RE: Searching a user space

["Bob Cozzi" <cozzi@xxxxxxxxx>]

The (subjectively) fastest way to search it is to use the MEMCHR C function
(which is actually an MI instruction too) and search for the '<' character,
then, once you locate it, look at the next few characters for the 'pdf'
string.  If found, blah blah blah.
The prototype for memchr is available at the RPGLAB
(www.rpgiv.com/downloads) along with most other usefull C and MI
instructions.

-Bob


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Rick.Chevalier@xxxxxxxxxxxxxxx
Sent: Thursday, November 11, 2004 11:31 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: Searching a user space

I have an xml document loaded into a user space and I want to find a
specific tag.  I can use the %Scan BIF but I'm looking for something that
will search the entire user space at one time without having to loop and
check 64k at a time.

Currently I'm trying to use the C strstr function but it keeps giving me a
pointer value when the search string doesn't exist in the user space.  I
have listed the associated code below.

If anyone sees a problem with my code or has a better way I'm all ears (or
eyes in this case).

      // Search for substring

     d SchStr          pr              *   ExtProc('strstr')
Error number     
     d                                 *   Const Options(*String)
String to search 
     d                                 *   Const Options(*String)
String to find   

      // XML string being worked on                            
     d XMLString@      s               *                       
     d XMLString       s          64000    Based(XMLString@)   
                                                               

     d TmpPtr          s               * 

      // Search constants                                
     d b_PDF           s              5    Inz('<pdf ')  

         TmpPtr = SchStr(%TrimR(XMLString) :b_PDF); 

Rick
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