Code problems detected by cppcheck

Source/wtf/text/WTFString.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 603 matching lines @@
 
     if (is8Bit())
         return WTF::isAllSpecialCharacters<isSpecialCharacter, LChar>(characters8(), len);
     return WTF::isAllSpecialCharacters<isSpecialCharacter, UChar>(characters16(), len);
 }
 
 template<size_t inlineCapacity>
 inline void String::appendTo(Vector<UChar, inlineCapacity>& result, unsigned pos, unsigned len) const
 {
     unsigned numberOfCharactersToCopy = std::min(len, length() - pos);
-    if (numberOfCharactersToCopy <= 0)
+    if (!numberOfCharactersToCopy)
         return;
     result.reserveCapacity(result.size() + numberOfCharactersToCopy);
     if (is8Bit()) {
         const LChar* characters8 = m_impl->characters8();
         for (size_t i = 0; i < numberOfCharactersToCopy; ++i)
             result.uncheckedAppend(characters8[pos + i]);
     } else {
         const UChar* characters16 = m_impl->characters16();
         result.append(characters16 + pos, numberOfCharactersToCopy);
     }
 }
 
 template<typename BufferType>
 inline void String::appendTo(BufferType& result, unsigned pos, unsigned len) const
 {
     unsigned numberOfCharactersToCopy = std::min(len, length() - pos);
-    if (numberOfCharactersToCopy <= 0)
+    if (!numberOfCharactersToCopy)
         return;
     if (is8Bit())
         result.append(m_impl->characters8() + pos, numberOfCharactersToCopy);
     else
         result.append(m_impl->characters16() + pos, numberOfCharactersToCopy);
 }
 
 template<size_t inlineCapacity>
 inline void String::prependTo(Vector<UChar, inlineCapacity>& result, unsigned pos, unsigned len) const
 {
     unsigned numberOfCharactersToCopy = std::min(len, length() - pos);
-    if (numberOfCharactersToCopy <= 0)
+    if (!numberOfCharactersToCopy)
         return;
     if (is8Bit()) {
         size_t oldSize = result.size();
         result.resize(oldSize + numberOfCharactersToCopy);
         memmove(result.data() + numberOfCharactersToCopy, result.data(), oldSize * sizeof(UChar));
         StringImpl::copyChars(result.data(), m_impl->characters8() + pos, numberOfCharactersToCopy);
     } else {
         result.prepend(m_impl->characters16() + pos, numberOfCharactersToCopy);
     }
 }
@@ skipping 36 matching lines @@
 using WTF::charactersToFloat;
 using WTF::equal;
 using WTF::equalIgnoringCase;
 using WTF::find;
 using WTF::isAllSpecialCharacters;
 using WTF::isSpaceOrNewline;
 using WTF::reverseFind;
 
 #include "wtf/text/AtomicString.h"
 #endif