From db7a2f93e02754a2abedee7316d765157a3b8738 Mon Sep 17 00:00:00 2001
From: Bruno Levy <Bruno.Levy@inria.fr>
Date: Tue, 22 Aug 2023 13:15:54 +0200
Subject: [PATCH] fix for out of bound string access in boolean expr parser
 (thanks @grassofsky)

---
 src/lib/geogram/mesh/mesh_surface_intersection.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib/geogram/mesh/mesh_surface_intersection.cpp b/src/lib/geogram/mesh/mesh_surface_intersection.cpp
index 4e73ade556d2..b7fa74f52a63 100644
--- a/src/lib/geogram/mesh/mesh_surface_intersection.cpp
+++ b/src/lib/geogram/mesh/mesh_surface_intersection.cpp
@@ -1139,7 +1139,7 @@ namespace {
         }
 
         char cur_char() const {
-            return *ptr_;
+            return (ptr_ == expr_.end()) ? '\0' : *ptr_;
         }
         
         void next_char() {