diff --git a/cmds/lshal/TextTable.cpp b/cmds/lshal/TextTable.cpp
new file mode 100644
index 0000000..0a721e9
--- /dev/null
+++ b/cmds/lshal/TextTable.cpp
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <algorithm>
+#include <iomanip>
+
+#include "TextTable.h"
+
+namespace android {
+namespace lshal {
+
+void TextTable::computeWidth(const std::vector<std::string>& v) {
+    if (mWidths.size() < v.size()) {
+        mWidths.resize(v.size());
+    }
+    for (size_t i = 0; i < v.size() - 1; ++i) {
+        mWidths[i] = std::max(mWidths[i], v[i].length());
+    }
+    // last column has std::setw(0) to avoid printing unnecessary spaces.
+    mWidths[v.size() - 1] = 0;
+}
+
+void TextTable::dump(std::ostream& out) const {
+    out << std::left;
+    for (const auto& row : mTable) {
+        if (!row.isRow()) {
+            out << row.line() << std::endl;
+            continue;
+        }
+
+        for (size_t i = 0; i < row.fields().size(); ++i) {
+            if (i != 0) {
+                out << " ";
+            }
+            if (i < mWidths.size()) {
+                out << std::setw(mWidths[i]);
+            }
+            out << row.fields()[i];
+        }
+        out << std::endl;
+    }
+}
+
+} // namespace lshal
+} // namespace android