4 files changed, 81 insertions, 8 deletions
diff --git a/indra/llcommon/llformat.cpp b/indra/llcommon/llformat.cpp
index cf509bee14..689f649d0a 100644
--- a/indra/llcommon/llformat.cpp
+++ b/indra/llcommon/llformat.cpp
@@ -37,16 +37,40 @@
 
 #include <cstdarg>
 
-std::string llformat(const char *fmt, ...)
+// common used function with va_list argument
+// wrapper for vsnprintf to be called from llformatXXX functions.
+static void va_format(std::string& out, const char *fmt, va_list va)
 {
 	char tstr[1024];	/* Flawfinder: ignore */
-	va_list va;
-	va_start(va, fmt);
 #if LL_WINDOWS
 	_vsnprintf(tstr, 1024, fmt, va);
 #else
 	vsnprintf(tstr, 1024, fmt, va);	/* Flawfinder: ignore */
 #endif
+	out.assign(tstr);
+}
+
+std::string llformat(const char *fmt, ...)
+{
+	std::string res;
+	va_list va;
+	va_start(va, fmt);
+	va_format(res, fmt, va);
 	va_end(va);
-	return std::string(tstr);
+	return res;
+}
+
+std::string llformat_to_utf8(const char *fmt, ...)
+{
+	std::string res;
+	va_list va;
+	va_start(va, fmt);
+	va_format(res, fmt, va);
+	va_end(va);
+
+#if LL_WINDOWS
+	// made converting to utf8. See EXT-8318.
+	res = ll_convert_string_to_utf8_string(res);
+#endif
+	return res;
 }
diff --git a/indra/llcommon/llformat.h b/indra/llcommon/llformat.h
index dc64edb26d..17d8b4a8ad 100644
--- a/indra/llcommon/llformat.h
+++ b/indra/llcommon/llformat.h
@@ -42,4 +42,8 @@
 
 std::string LL_COMMON_API llformat(const char *fmt, ...);
 
+// the same version as above but ensures that returned string is in utf8 on windows
+// to enable correct converting utf8_to_wstring.
+std::string LL_COMMON_API llformat_to_utf8(const char *fmt, ...);
+
 #endif // LL_LLFORMAT_H
diff --git a/indra/llcommon/llstring.cpp b/indra/llcommon/llstring.cpp
index 1561bda201..671b0a108c 100644
--- a/indra/llcommon/llstring.cpp
+++ b/indra/llcommon/llstring.cpp
@@ -633,14 +633,14 @@ namespace snprintf_hack
 	}
 }
 
-std::string ll_convert_wide_to_string(const wchar_t* in)
+std::string ll_convert_wide_to_string(const wchar_t* in, unsigned int code_page)
 {
 	std::string out;
 	if(in)
 	{
 		int len_in = wcslen(in);
 		int len_out = WideCharToMultiByte(
-			CP_ACP,
+			code_page,
 			0,
 			in,
 			len_in,
@@ -655,7 +655,7 @@ std::string ll_convert_wide_to_string(const wchar_t* in)
 		if(pout)
 		{
 			WideCharToMultiByte(
-				CP_ACP,
+				code_page,
 				0,
 				in,
 				len_in,
@@ -669,6 +669,38 @@ std::string ll_convert_wide_to_string(const wchar_t* in)
 	}
 	return out;
 }
+
+wchar_t* ll_convert_string_to_wide(const std::string& in, unsigned int code_page)
+{
+	// From review:
+	// We can preallocate a wide char buffer that is the same length (in wchar_t elements) as the utf8 input,
+	// plus one for a null terminator, and be guaranteed to not overflow.
+
+	//	Normally, I'd call that sort of thing premature optimization,
+	// but we *are* seeing string operations taking a bunch of time, especially when constructing widgets.
+//	int output_str_len = MultiByteToWideChar(code_page, 0, in.c_str(), in.length(), NULL, 0);
+
+	// reserve place to NULL terminator
+	int output_str_len = in.length();
+	wchar_t* w_out = new wchar_t[output_str_len + 1];
+
+	memset(w_out, 0, output_str_len + 1);
+	int real_output_str_len = MultiByteToWideChar (code_page, 0, in.c_str(), in.length(), w_out, output_str_len);
+
+	//looks like MultiByteToWideChar didn't add null terminator to converted string, see EXT-4858.
+	w_out[real_output_str_len] = 0;
+
+	return w_out;
+}
+
+std::string ll_convert_string_to_utf8_string(const std::string& in)
+{
+	wchar_t* w_mesg = ll_convert_string_to_wide(in, CP_ACP);
+	std::string out_utf8(ll_convert_wide_to_string(w_mesg, CP_UTF8));
+	delete[] w_mesg;
+
+	return out_utf8;
+}
 #endif // LL_WINDOWS
 
 long LLStringOps::sPacificTimeOffset = 0;
diff --git a/indra/llcommon/llstring.h b/indra/llcommon/llstring.h
index 8071c8aa2d..41fac0f8cc 100644
--- a/indra/llcommon/llstring.h
+++ b/indra/llcommon/llstring.h
@@ -564,7 +564,20 @@ using snprintf_hack::snprintf;
  *
  * This replaces the unsafe W2A macro from ATL.
  */
-LL_COMMON_API std::string ll_convert_wide_to_string(const wchar_t* in);
+LL_COMMON_API std::string ll_convert_wide_to_string(const wchar_t* in, unsigned int code_page);
+
+/**
+ * Converts a string to wide string.
+ *
+ * It will allocate memory for result string with "new []". Don't forget to release it with "delete []".
+ */
+LL_COMMON_API wchar_t* ll_convert_string_to_wide(const std::string& in, unsigned int code_page);
+
+/**
+ * Converts incoming string into urf8 string
+ *
+ */
+LL_COMMON_API std::string ll_convert_string_to_utf8_string(const std::string& in);
 
 //@}
 #endif // LL_WINDOWS