From 9e17e8520f182ac81fb4f1092281a6969bf93083 Mon Sep 17 00:00:00 2001
From: "Hong, Yang A" <yang.a.hong@intel.com>
Date: Thu, 4 Mar 2021 16:13:46 +0000
Subject: [PATCH] literal API: add empty string check.

fixes github issue #302, #304
---
 src/compiler/compiler.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/compiler/compiler.cpp b/src/compiler/compiler.cpp
index 5751bd64..15a130dd 100644
--- a/src/compiler/compiler.cpp
+++ b/src/compiler/compiler.cpp
@@ -416,6 +416,10 @@ void addLitExpression(NG &ng, unsigned index, const char *expression,
                            "HS_FLAG_SOM_LEFTMOST are supported in literal API.");
     }
 
+    if (!strcmp(expression, "")) {
+        throw CompileError("Pure literal API doesn't support empty string.");
+    }
+
     // This expression must be a pure literal, we can build ue2_literal
     // directly based on expression text.
     ParsedLitExpression ple(index, expression, expLength, flags, id);