commit 17a257d3bce48df37fdbf0fcb6496478e585d5d5
Author: Daniel Swanson <popcorn.tomato.dude@gmail.com>
Date:   Sat Aug 7 10:09:28 2021 -0500

    const lookup function for StringWriter

diff --git a/lttoolbox/string_writer.cc b/lttoolbox/string_writer.cc
index bb4d6eb..1d76bbb 100644
--- a/lttoolbox/string_writer.cc
+++ b/lttoolbox/string_writer.cc
@@ -34,6 +34,26 @@ StringWriter::add(UString_view s)
   return ret;
 }
 
+StringRef
+StringWriter::find(UString_view s) const
+{
+  StringRef ret;
+  ret.start = 0;
+  ret.count = 0;
+  UString_view buf;
+  if (mmapping) {
+    buf = UString_view(mmap_buffer, mmap_size);
+  } else {
+    buf = UString_view(edit_buffer);
+  }
+  auto start = buf.find(s);
+  if (start != UString_view::npos) {
+    ret.start = start;
+    ret.count = s.size();
+  }
+  return ret;
+}
+
 UString_view
 StringWriter::get(const uint32_t start, const uint32_t count)
 {
diff --git a/lttoolbox/string_writer.h b/lttoolbox/string_writer.h
index 182180f..300c4fd 100644
--- a/lttoolbox/string_writer.h
+++ b/lttoolbox/string_writer.h
@@ -35,6 +35,7 @@ private:
   UChar* mmap_buffer;
 public:
   StringRef add(UString_view s);
+  StringRef find(UString_view s) const;
   UString_view get(const uint32_t start, const uint32_t count);
   UString_view get(const StringRef& ref);
   void read(FILE* in);