sal: try to avoid abuse of OUStringBuffer(int) ctor

... to avoid bugs like commit f0d6e0e1.

Change-Id: I1e41d421609e09bf62a7a04ba34f3a8e8d118fd3

include/rtl/strbuf.hxx

@@ -96,6 +96,23 @@ public:
     {
         rtl_string_new_WithLength( &pData, length );
     }
+#if __cplusplus >= 201103L
+    explicit OStringBuffer(unsigned int length)
+        : OStringBuffer(static_cast<int>(length))
+    {
+    }
+    explicit OStringBuffer(long length)
+        : OStringBuffer(static_cast<int>(length))
+    {
+    }
+    explicit OStringBuffer(unsigned long length)
+        : OStringBuffer(static_cast<int>(length))
+    {
+    }
+    // avoid obvious bugs
+    explicit OStringBuffer(char) = delete;
+    explicit OStringBuffer(sal_Unicode) = delete;
+#endif
 
     /**
         Constructs a string buffer so that it represents the same

include/rtl/ustrbuf.hxx

@@ -91,6 +91,23 @@ public:
     {
         rtl_uString_new_WithLength( &pData, length );
     }
+#if __cplusplus >= 201103L
+    explicit OUStringBuffer(unsigned int length)
+        : OUStringBuffer(static_cast<int>(length))
+    {
+    }
+    explicit OUStringBuffer(long length)
+        : OUStringBuffer(static_cast<int>(length))
+    {
+    }
+    explicit OUStringBuffer(unsigned long length)
+        : OUStringBuffer(static_cast<int>(length))
+    {
+    }
+    // avoid obvious bugs
+    explicit OUStringBuffer(char) = delete;
+    explicit OUStringBuffer(sal_Unicode) = delete;
+#endif
 
     /**
         Constructs a string buffer so that it represents the same

sc/source/core/data/documen4.cxx

@@ -374,7 +374,8 @@ void ScDocument::InsertTableOp(const ScTabOpParam& rParam,  // multiple (repeate
     }
 
     ScRefAddress aRef;
-    OUStringBuffer aForString('=');
+    OUStringBuffer aForString;
+    aForString.append('=');
     aForString.append(ScCompiler::GetNativeSymbol(ocTableOp));
     aForString.append(ScCompiler::GetNativeSymbol( ocOpen));
 

sc/source/core/data/documentimport.cxx

@@ -375,7 +375,8 @@ void ScDocumentImport::setTableOpCells(const ScRange& rRange, const ScTabOpParam
 
     ScDocument* pDoc = &mpImpl->mrDoc;
     ScRefAddress aRef;
-    OUStringBuffer aFormulaBuf('=');
+    OUStringBuffer aFormulaBuf;
+    aFormulaBuf.append('=');
     aFormulaBuf.append(ScCompiler::GetNativeSymbol(ocTableOp));
     aFormulaBuf.append(ScCompiler::GetNativeSymbol(ocOpen));
 

xmloff/source/text/txtparai.cxx

@@ -133,7 +133,7 @@ void XMLCharContext::EndElement()
         }
         else
         {
-            OUStringBuffer sBuff( m_nCount );
+            OUStringBuffer sBuff(static_cast<int>(m_nCount));
             while( m_nCount-- )
                 sBuff.append( &m_c, 1 );