From b5c0c83b722486b8bbc19a65b66e260c7024e2f8 Mon Sep 17 00:00:00 2001
From: Christoph Lipka <c-lipka@users.noreply.github.com>
Date: Mon, 14 Jan 2019 17:43:10 +0100
Subject: [PATCH] [parser] Fix bug in scanner that caused parse errors in
 certain recursive macro call scenarios.

---
 source/parser/scanner.cpp | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/source/parser/scanner.cpp b/source/parser/scanner.cpp
index d0ef6eaf3..d065fa1ec 100644
--- a/source/parser/scanner.cpp
+++ b/source/parser/scanner.cpp
@@ -701,14 +701,11 @@ UCS2String Scanner::BufferedSource::GetInputStreamName() const
 bool Scanner::BufferedSource::SeekAndRefill(POV_OFF_T pos)
 {
     mBuffer.Clear();
-    if (mBase != pos)
-    {
-        bool seekOk = mpStream->seekg(pos);
-        mBase = mpStream->tellg();
-        POV_PARSER_ASSERT((mBase == pos) || !seekOk);
-        if (!seekOk)
-            return false; // TODO - Maybe report issue via an exception.
-    }
+    bool seekOk = mpStream->seekg(pos);
+    mBase = mpStream->tellg();
+    POV_PARSER_ASSERT((mBase == pos) || !seekOk);
+    if (!seekOk)
+        return false; // TODO - Maybe report issue via an exception.
     mExhausted = false;
     (void)RefillBuffer();
     return true;