[Issue 128533] The BASIC function Str inserts a space before negative numbers

[bugzilla]

https://bz.apache.org/ooo/show_bug.cgi?id=128533

dam...@apache.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Latest|---                         |4.2.0-dev
    Confirmation in|                            |
           Hardware|PC                          |All
                 CC|                            |dam...@apache.org
                 OS|Windows, all                |All

--- Comment #1 from dam...@apache.org ---
Our StarBasic implementation is in main/basic. In there, built-in functions
like Str() are declared with the form RTLFUNC(Str), and be found with:

$ grep RTLFUNC\(Str * -R

which gives, among others:

runtime/methods.cxx:RTLFUNC(Str)

where we see what it does:

---snip---
   1573 RTLFUNC(Str)
   1574 {
   1575     (void)pBasic;
   1576     (void)bWrite;
   1577 
   1578     if ( rPar.Count() < 2 )
   1579         StarBASIC::Error( SbERR_BAD_ARGUMENT );
   1580     else
   1581     {
   1582         String aStr;
   1583         SbxVariableRef pArg = rPar.Get( 1 );
   1584         pArg->Format( aStr );
   1585 
   1586         // Numbers start with a space
   1587         if( pArg->IsNumericRTL() )
   1588         {
   1589             // Kommas durch Punkte ersetzen, damit es symmetrisch zu
Val ist!
   1590             aStr.SearchAndReplace( ',', '.' );
   1591 
   1592             SbiInstance* pInst = pINST;
   1593             bool bCompatibility = ( pInst && pInst->IsCompatibility()
);
   1594             if( bCompatibility )
   1595             {
   1596                 xub_StrLen nLen = aStr.Len();
   1597 
   1598                 const sal_Unicode* pBuf = aStr.GetBuffer();
   1599 
   1600                 bool bNeg = ( pBuf[0] == '-' );
   1601                 sal_uInt16 iZeroSearch = 0;
   1602                 if( bNeg )
   1603                     iZeroSearch++;
   1604 
   1605                 sal_uInt16 iNext = iZeroSearch + 1;
   1606                 if( pBuf[iZeroSearch] == '0' && nLen > iNext &&
pBuf[iNext] == '.' )
   1607                 {
   1608                     aStr.Erase( iZeroSearch, 1 );
   1609                     pBuf = aStr.GetBuffer();
   1610                 }
   1611                 if( !bNeg )
   1612                     aStr.Insert( ' ', 0 );
   1613             }
   1614             else
   1615                 aStr.Insert( ' ', 0 );
   1616         }
   1617         rPar.Get(0)->PutString( aStr );
   1618     }
   1619 }
---snip---

Put a breakpoint on SbRtl_Str (which is what RTLFUNC(Str) mangles the name to),
and debugging, line 1587 is true, and line 1594 is false, so a space is
unconditionally appended in line 1615.

Maybe line 1615 should check for bNeg before adding the space, like lines
1611-1612 do?

As for the relationship between Str() and Format(), note that line 1584 calls
pArg->Format(). The built-in Format() function in RTLFUNC(Format) also calls
the Format() method on its arg. These end up in SbxValue::Format() of
main/basic/source/sbx/sbxscan.cxx, and end up converting the double to a
string. Yet Str() adds the space after calling Format(). So it's not accurate
to say "the Format function works like the Str function".

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