Explicit function for obtaining 7-bit ascii, ryzom/ryzomcore#335

nel/include/nel/misc/utf_string_view.h

@@ -60,6 +60,7 @@ public:
 	u32string toUtf32() const; // Makes a copy
 
 	std::wstring toWide() const; // Platform dependent, UTF-16 or UTF-32. Makes a copy.
+	std::string toAscii() const; // Returns only values 0-127, 7-bit ASCII. Makes a copy.
 
 	inline bool isUtf8() const { return m_Iterator == utf8Iterator; }
 	inline bool isUtf16() const { return m_Iterator == utf16Iterator; }

nel/src/misc/utf_string_view.cpp

@@ -106,6 +106,21 @@ u32string CUtfStringView::toUtf32() const
 	return res;
 }
 
+std::string CUtfStringView::toAscii() const
+{
+	std::string res;
+	res.reserve(m_Size);
+	for (iterator it(begin()), end(end()); it != end; ++it)
+	{
+		u32char c = *it;
+		if (c < 0x80)
+			res += c;
+		else
+			res += '_';
+	}
+	return res;
+}
+
 std::wstring CUtfStringView::toWide() const
 {
 #ifdef NL_OS_WINDOWS