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Uses
{$IFDEF OS2}
DosCalls,
{$ENDIF OS2}
RexxSAA;
Var
Arg: RxString; // argument string for REXX
RexxRetVal: RxString; // return value from REXX
RC: Cardinal; // return code from REXX
Const
Str: PChar = 'These words will be swapped'; // text to swap
RexxRc: Integer = 0; // return code from function
Begin
Write('This program will call the REXX interpreter ');
WriteLn('to reverse the order of the');
Write(#9'words in a string. ');
WriteLn('The interpreter is invoked with an initial');
Write(#9'environment name of "FNC" ');
WriteLn('and a file name of "backward.fnc"');
// By setting the strlength of the output RXSTRING to zero, we
// force the interpreter to allocate memory and return it to us.
// We could provide a buffer for the interpreter to use instead.
RexxRetVal.StrLength:=0; // initialize return to empty
MakeRxString(Arg, Str, StrLen(Str)); // create input argument
// Here we call the interpreter. We don't really need to use
// all the casts in this call; they just help illustrate
// the data types used.
RC:=RexxStart(1, // number of arguments
addr(arg), // array of arguments
'backward.fnc', // name of REXX file
0, // No INSTORE used
'FNC', // Command env. name
RXSUBROUTINE, // Code for how invoked
0, // No EXITs on this call
rexxrc, // Rexx program output
rexxretval ); // Rexx program output
WriteLn('Interpreter Return Code: ', RC);
WriteLn('Function Return Code: ', rexxrc);
WriteLn('Original String: ', arg.strptr);
WriteLn('Backwards String: ', StrPas(rexxretval.strptr));
{$IFDEF OS2}
DosFreeMem(RexxRetVal.StrPtr); // Release storage
{$ELSE OS2}
{$WARNING Memory allocated for RexxRetVal.StrPtr^ should be freed using native API!}
{$ENDIF OS2}
End.
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