Avoid getTokenCount

Change-Id: I66d6e8d91924b2dcca9ab8ab499fb94bfb1dc723
Reviewed-on: https://gerrit.libreoffice.org/65658
Tested-by: Jenkins
Reviewed-by: Matteo Casalin <matteo.casalin@yahoo.com>

svl/source/numbers/zformat.cxx

@@ -2038,6 +2038,27 @@ void SvNumberformat::ImpGetOutputStandard(double& fNumber, OUString& rOutString)
     }
 }
 
+namespace
+{
+
+template<typename T>
+bool checkForAll0s(const T& rString, sal_Int32 nIdx=0)
+{
+    if (nIdx>=rString.getLength())
+        return false;
+
+    do
+    {
+        if (rString[nIdx]!='0')
+            return false;
+    }
+    while (++nIdx<rString.getLength());
+
+    return true;
+}
+
+}
+
 void SvNumberformat::ImpGetOutputStdToPrecision(double& rNumber, OUString& rOutString, sal_uInt16 nPrecision) const
 {
     // Make sure the precision doesn't go over the maximum allowable precision.
@@ -2051,8 +2072,7 @@ void SvNumberformat::ImpGetOutputStdToPrecision(double& rNumber, OUString& rOutS
     rOutString = ::rtl::math::doubleToUString( rNumber,
                                                rtl_math_StringFormat_F, nPrecision /*2*/,
                                                GetFormatter().GetNumDecimalSep()[0], true );
-    if (rOutString[0] == '-' &&
-        comphelper::string::getTokenCount(rOutString, '0') == rOutString.getLength())
+    if (rOutString[0] == '-' && checkForAll0s(rOutString, 1))
     {
         rOutString = comphelper::string::stripStart(rOutString, '-'); // not -0
     }
@@ -4302,8 +4322,7 @@ bool SvNumberformat::ImpGetNumberOutput(double fNumber,
             }
             sStr.remove( nDecPos, 1 ); //  Remove .
         }
-        if (bSign && (sStr.isEmpty() ||
-                      comphelper::string::getTokenCount(sStr.toString(), '0') == sStr.getLength()+1))   // Only 00000
+        if (bSign && (sStr.isEmpty() || checkForAll0s(sStr)))   // Only 00000
         {
             bSign = false;              // Not -0.00
         }