Difference between revisions of "Scan and Replace"
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The following are the RPG/LE fully free-form definitions and instructions needed for using the {{AN}} service procedure. This service procedure simply allows the caller to find all needles in a haystack and replace them with a straw. If the replacement "straw" is a zero-length string, then the "needle" is simply deleted. | The following are the RPG/LE fully free-form definitions and instructions needed for using the {{AN}} service procedure. This service procedure simply allows the caller to find all needles in a haystack and replace them with a straw. If the replacement "straw" is a zero-length string, then the "needle" is simply deleted. | ||
| − | == Service | + | == Service Prototype == |
| + | Place the following in a separate copybook for inclusion in both the caller and the service program source members. | ||
<pre> | <pre> | ||
**free | **free | ||
| Line 17: | Line 18: | ||
Straw varchar(32767) const; | Straw varchar(32767) const; | ||
end-pr; | end-pr; | ||
| + | </pre> | ||
| + | |||
| + | == Service Procedure == | ||
| + | Place the following in a service program source member. | ||
| + | <pre> | ||
| + | **free | ||
//============================================================================== | //============================================================================== | ||
Revision as of 16:22, 14 December 2018
Summary
The following are the RPG/LE fully free-form definitions and instructions needed for using the Scan and Replace service procedure. This service procedure simply allows the caller to find all needles in a haystack and replace them with a straw. If the replacement "straw" is a zero-length string, then the "needle" is simply deleted.
Service Prototype
Place the following in a separate copybook for inclusion in both the caller and the service program source members.
**free //============================================================================== // Find all occurrences of a "needle" in the "haystack" and replace them // with the "straw" -- returning the "newhaystack". //============================================================================== dcl-pr GenUtl_ScanAndReplace varchar(65535) rtnparm; Needle varchar(32767) const; Haystack varchar(65535) const; Straw varchar(32767) const; end-pr;
Service Procedure
Place the following in a service program source member.
**free
//==============================================================================
// Find all occurrences of a "needle" in the "haystack" and replace them
// with the "straw" -- returning the "newhaystack".
//==============================================================================
dcl-proc GenUtl_ScanAndReplace export;
dcl-pi *n varchar(65535) rtnparm;
Needle varchar(32767) const;
Haystack varchar(65535) const;
Straw varchar(32767) const;
end-pi;
dcl-s NewHaystack like(Haystack);
dcl-s posn packed(5:0);
NewHaystack = Haystack; // transfer haystack to internal area
posn = %scan(Needle: NewHaystack); // find first needle, if any
dow posn > *zero; // loop on needles found
NewHaystack = %replace(Straw: NewHaystack: posn: %len(Needle));
if ((posn + %len(Straw)) <= %len(NewHaystack)); // room for more needles?
posn = %scan(Needle: NewHaystack: posn + %len(Straw)); // yes, find one
else; // else
posn = *zero; // end of haystack
endif;
enddo; // end loop on needles found
return NewHaystack; // return to caller
end-proc;
