From 6108d09e8d0e768c4a5a9cfaeebb17284afe9833 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Sat, 7 Jan 2017 16:34:01 -0500
Subject: [PATCH] add Buffer::Iterator::warp_to_offset()

---
 src/core/Buffer-Iterator.cc | 21 +++++++++++++++++++++
 src/core/Buffer.h           |  1 +
 2 files changed, 22 insertions(+)

diff --git a/src/core/Buffer-Iterator.cc b/src/core/Buffer-Iterator.cc
index 2a0b901..daa0ce7 100644
--- a/src/core/Buffer-Iterator.cc
+++ b/src/core/Buffer-Iterator.cc
@@ -180,3 +180,24 @@ bool Buffer::Iterator::go_next_line()
     }
     return false;
 }
+
+void Buffer::Iterator::warp_to_offset(size_t offset)
+{
+    Iterator i = m_buffer->begin();
+    m_offset = i.m_offset;
+    m_line = i.m_line;
+    for (;;)
+    {
+        i.go_forward();
+        if (i.m_offset > offset)
+        {
+            break;
+        }
+        m_offset = i.m_offset;
+        m_line = i.m_line;
+        if (!i.valid())
+        {
+            break;
+        }
+    }
+}
diff --git a/src/core/Buffer.h b/src/core/Buffer.h
index abee5a2..a98d258 100644
--- a/src/core/Buffer.h
+++ b/src/core/Buffer.h
@@ -46,6 +46,7 @@ public:
             m_offset += offset_offset;
             m_line += line_offset;
         }
+        void warp_to_offset(size_t offset);
         uint8_t * address() const
         {
             return m_buffer->address(m_offset);