size some stringbuffer to prevent re-alloc

I started with 32 and kept doubling the size until the site
did not need re-alloc, but clamped it at 512.

Change-Id: I55fe36b31cd3d40f86e5729337a927cf920f2af6
Reviewed-on: https://gerrit.libreoffice.org/81960
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

5 files changed, 9 insertions, 11 deletions

diff --git a/sc/source/core/tool/calcconfig.cxx b/sc/source/core/tool/calcconfig.cxx
index 6bafa226e8b5..9f9bf35bacc0 100644
--- a/sc/source/core/tool/calcconfig.cxx
+++ b/sc/source/core/tool/calcconfig.cxx
@@ -193,7 +193,7 @@ bool ScCalcConfig::operator!= (const ScCalcConfig& r) const
 
 OUString ScOpCodeSetToSymbolicString(const ScCalcConfig::OpCodeSet& rOpCodes)
 {
-    OUStringBuffer result;
+    OUStringBuffer result(256);
     formula::FormulaCompiler aCompiler;
     formula::FormulaCompiler::OpCodeMapPtr pOpCodeMap(aCompiler.GetOpCodeMap(css::sheet::FormulaLanguage::ENGLISH));
 
diff --git a/sc/source/core/tool/userlist.cxx b/sc/source/core/tool/userlist.cxx
index 96e6983ac712..60d6a163ec60 100644
--- a/sc/source/core/tool/userlist.cxx
+++ b/sc/source/core/tool/userlist.cxx
@@ -212,7 +212,7 @@ ScUserList::ScUserList()
         xCal = rCalendar.Days;
         if ( xCal.hasElements() )
         {
-            OUStringBuffer aDayShortBuf, aDayLongBuf;
+            OUStringBuffer aDayShortBuf(32), aDayLongBuf(64);
             sal_Int32 i;
             sal_Int32 nLen = xCal.getLength();
             sal_Int16 nStart = sal::static_int_cast<sal_Int16>(nLen);
@@ -244,7 +244,7 @@ ScUserList::ScUserList()
         xCal = rCalendar.Months;
         if ( xCal.hasElements() )
         {
-            OUStringBuffer aMonthShortBuf, aMonthLongBuf;
+            OUStringBuffer aMonthShortBuf(128), aMonthLongBuf(128);
             sal_Int32 i;
             sal_Int32 nLen = xCal.getLength() - 1;
             for (i = 0; i < nLen; i++)
diff --git a/sc/source/filter/excel/xipage.cxx b/sc/source/filter/excel/xipage.cxx
index 29110f79b363..db8f4377a1c2 100644
--- a/sc/source/filter/excel/xipage.cxx
+++ b/sc/source/filter/excel/xipage.cxx
@@ -224,17 +224,15 @@ void XclImpPageSettings::Finalize()
 
     // *** create page style sheet ***
 
-    OUStringBuffer aStyleName;
-    aStyleName.append("PageStyle_");
-
+    OUString aStyleName;
     OUString aTableName;
     if( GetDoc().GetName( nScTab, aTableName ) )
-        aStyleName.append(aTableName);
+        aStyleName = "PageStyle_" + aTableName;
     else
-        aStyleName.append(static_cast<sal_Int32>(nScTab+1));
+        aStyleName = "PageStyle_" + OUString::number(static_cast<sal_Int32>(nScTab+1));
 
     ScStyleSheet& rStyleSheet = ScfTools::MakePageStyleSheet(
-        GetStyleSheetPool(), aStyleName.makeStringAndClear(), false);
+        GetStyleSheetPool(), aStyleName, false);
 
     SfxItemSet& rItemSet = rStyleSheet.GetItemSet();
 
diff --git a/sc/source/filter/excel/xistream.cxx b/sc/source/filter/excel/xistream.cxx
index 8e48027cdf1b..f7427b9295ed 100644
--- a/sc/source/filter/excel/xistream.cxx
+++ b/sc/source/filter/excel/xistream.cxx
@@ -831,7 +831,7 @@ std::size_t XclImpStream::ReadUniStringExtHeader( bool& rb16Bit, sal_uInt8 nFlag
 
 OUString XclImpStream::ReadRawUniString( sal_uInt16 nChars, bool b16Bit )
 {
-    OUStringBuffer aRet;
+    OUStringBuffer aRet(nChars);
     sal_uInt16 nCharsLeft = nChars;
     sal_uInt16 nReadSize;
 
diff --git a/sc/source/filter/xml/xmlcelli.hxx b/sc/source/filter/xml/xmlcelli.hxx
index d80cfa759619..10aeb2dda44a 100644
--- a/sc/source/filter/xml/xmlcelli.hxx
+++ b/sc/source/filter/xml/xmlcelli.hxx
@@ -68,7 +68,7 @@ class ScXMLTableRowCellContext : public ScXMLImportContext
     boost::optional<OUString> maFirstParagraph; /// unformatted first paragraph, for better performance.
 
     ScEditEngineDefaulter* mpEditEngine;
-    OUStringBuffer maParagraph;
+    OUStringBuffer maParagraph{32};
     sal_Int32 mnCurParagraph;
 
     ParaFormatsType maFormats;