add LcharToUTF8

stepmania/src/RageUtil.cpp

@@ -917,3 +917,48 @@ lstring CStringToLstring(const CString &str)
 
 	return ret;
 }
+
+int unichar_to_utf8 (longchar c, char *outbuf)
+{
+	unsigned int len = 0;
+	int first;
+
+	if (c < 0x80) {
+		first = 0;
+		len = 1;
+	} else if (c < 0x800) {
+		first = 0xc0;
+		len = 2;
+	} else if (c < 0x10000) {
+		first = 0xe0;
+		len = 3;
+	} else if (c < 0x200000) {
+		first = 0xf0;
+		len = 4;
+	} else if (c < 0x4000000) {
+		first = 0xf8;
+		len = 5;
+	} else {
+		first = 0xfc;
+		len = 6;
+	}
+
+	if (outbuf)
+	{
+		for (int i = len - 1; i > 0; --i)
+		{
+			outbuf[i] = char((c & 0x3f) | 0x80);
+			c >>= 6;
+		}
+		outbuf[0] = char(c | first);
+	}
+
+	return len;
+}
+
+CString LcharToUTF8( longchar c )
+{
+	char buf[6];
+	int cnt = unichar_to_utf8(c, buf);
+	return CString(buf, cnt);
+}

stepmania/src/RageUtil.h

@@ -154,6 +154,7 @@ typedef int longchar;
 typedef basic_string<longchar> lstring;
 
 lstring CStringToLstring(const CString &str);
+CString LcharToUTF8( longchar c );
 
 // Splits a CString into an CStringArray according the Deliminator.
 void split(