Index: src/3rdparty/squirrel/squirrel/sqapi.cpp
===================================================================
--- src/3rdparty/squirrel/squirrel/sqapi.cpp	(revision 27218)
+++ src/3rdparty/squirrel/squirrel/sqapi.cpp	(working copy)
@@ -1262,9 +1262,17 @@
 WChar buf_lexfeed(SQUserPointer file)
 {
 	BufState *buf=(BufState*)file;
-	if(buf->size<(buf->ptr+1))
-		return 0;
-	return buf->buf[buf->ptr++];
+
+	if (buf->size < buf->ptr + 1) return 0;
+
+	int len = Utf8EncodedCharLen(buf->buf[buf->ptr]);
+	if (buf->size < buf->ptr + len) return 0;
+
+	WChar result;
+	Utf8Decode(&result, buf->buf + buf->ptr);
+	buf->ptr += len;
+
+	return result;
 }
 
 SQRESULT sq_compilebuffer(HSQUIRRELVM v,const SQChar *s,SQInteger size,const SQChar *sourcename,SQBool raiseerror) {