Replace fallthrough comments with new SAL_FALLTHROUGH macro

...which (in LIBO_INTERNAL_ONLY) for Clang expands to [[clang::fallthrough]] in
preparation of enabling -Wimplicit-fallthrough.  (This is only relevant for
C++11, as neither C nor old C++ has a way to annotate intended fallthroughs.)

Could use BOOST_FALLTHROUGH instead of introducing our own SAL_FALLTHROUGH, but
that would require adding back in dependencies on boost_headers to many
libraries where we carefully removed any remaining Boost dependencies only
recently.  (At least make SAL_FALLTHROUGH strictly LIBO_INTERNAL_ONLY, so its
future evolution will not have any impact on the stable URE interface.)  C++17
will have a proper [[fallthroug]], eventually removing the need for a macro
altogether.

Change-Id: I342a7610a107db7d7a344ea9cbddfd9714d7e9ca

2 files changed, 12 insertions, 8 deletions

diff --git a/editeng/source/rtf/rtfitem.cxx b/editeng/source/rtf/rtfitem.cxx
index 3298878baf20..f10a60e1b46e 100644
--- a/editeng/source/rtf/rtfitem.cxx
+++ b/editeng/source/rtf/rtfitem.cxx
@@ -1366,17 +1366,17 @@ static void SetBorderLine( int nBorderTyp, SvxBoxItem& rItem,
         rItem.SetLine( &rBorder, SvxBoxItemLine::TOP );
         if( RTF_BOX != nBorderTyp )
             return;
-        // fall-through
+        SAL_FALLTHROUGH;
     case RTF_BRDRB:
         rItem.SetLine( &rBorder, SvxBoxItemLine::BOTTOM );
         if( RTF_BOX != nBorderTyp )
             return;
-        // fall-through
+        SAL_FALLTHROUGH;
     case RTF_BRDRL:
         rItem.SetLine( &rBorder, SvxBoxItemLine::LEFT );
         if( RTF_BOX != nBorderTyp )
             return;
-        // fall-through
+        SAL_FALLTHROUGH;
     case RTF_BRDRR:
         rItem.SetLine( &rBorder, SvxBoxItemLine::RIGHT );
         if( RTF_BOX != nBorderTyp )
@@ -1815,7 +1815,9 @@ void SvxRTFParser::SetDefault( int nToken, int nValue )
     bIsLeftToRightDef = true;
     switch( nToken )
     {
-    case RTF_ADEFF: bIsLeftToRightDef = false;  // no break!
+    case RTF_ADEFF:
+        bIsLeftToRightDef = false;
+        SAL_FALLTHROUGH;
     case RTF_DEFF:
         {
             if( -1 == nValue )
@@ -1829,7 +1831,9 @@ void SvxRTFParser::SetDefault( int nToken, int nValue )
         }
         break;
 
-    case RTF_ADEFLANG:  bIsLeftToRightDef = false;  // no break!
+    case RTF_ADEFLANG:
+        bIsLeftToRightDef = false;
+        SAL_FALLTHROUGH;
     case RTF_DEFLANG:
         // store default Language
         if( -1 != nValue )
diff --git a/editeng/source/rtf/svxrtf.cxx b/editeng/source/rtf/svxrtf.cxx
index 0c5a4522c001..c67fc8456f2d 100644
--- a/editeng/source/rtf/svxrtf.cxx
+++ b/editeng/source/rtf/svxrtf.cxx
@@ -187,7 +187,7 @@ void SvxRTFParser::NextToken( int nToken )
     case RTF_RDBLQUOTE:     cCh = 0x201D;   goto INSINGLECHAR;
 INSINGLECHAR:
         aToken = OUString(cCh);
-        // no Break, aToken is set as Text
+        SAL_FALLTHROUGH; // aToken is set as Text
     case RTF_TEXTTOKEN:
         {
             InsertText();
@@ -418,7 +418,7 @@ void SvxRTFParser::ReadColorTable()
                     : -1 == aToken.indexOf( ";" ) )
                 break;      // At least the ';' must be found
 
-            // else no break !!
+            SAL_FALLTHROUGH;
 
         case ';':
             if( IsParserWorking() )
@@ -509,7 +509,7 @@ void SvxRTFParser::ReadFontTable()
             // for technical/symbolic font of the rtl_TextEncoding is changed!
             case RTF_FTECH:
                 pFont->SetCharSet( RTL_TEXTENCODING_SYMBOL );
-                // deliberate fall through
+                SAL_FALLTHROUGH;
             case RTF_FNIL:
                 pFont->SetFamily( FAMILY_DONTKNOW );
                 break;