From 794fedc0dd2a4f291a0223086f978fdca94e759a Mon Sep 17 00:00:00 2001
From: Hassan <hlh@lanl.gov>
Date: Wed, 27 Sep 2023 17:08:32 -0600
Subject: [PATCH] better handling of wrong filenames

---
 examples/Optimization/MISDP/CBF/misdp_cbf.cpp | 4 ++++
 examples/Optimization/MISDP/CBF/read_misdp.h  | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/examples/Optimization/MISDP/CBF/misdp_cbf.cpp b/examples/Optimization/MISDP/CBF/misdp_cbf.cpp
index 65859aa5..c35dd693 100644
--- a/examples/Optimization/MISDP/CBF/misdp_cbf.cpp
+++ b/examples/Optimization/MISDP/CBF/misdp_cbf.cpp
@@ -94,6 +94,10 @@ int main(int argc, char * argv[]){
     m->add_hierarc=hierarc;
     
     auto g=CBF_read(fname.c_str(), m);
+    if(g.nodes.size()==0){
+        cerr << "graph with size 0\n";
+        return -1;
+    }
     m->print();
     DebugOn("Instance "<<fname<<endl);
 
diff --git a/examples/Optimization/MISDP/CBF/read_misdp.h b/examples/Optimization/MISDP/CBF/read_misdp.h
index a8814db6..8dcf2fc0 100644
--- a/examples/Optimization/MISDP/CBF/read_misdp.h
+++ b/examples/Optimization/MISDP/CBF/read_misdp.h
@@ -114,7 +114,8 @@ Net CBF_read(const char *file, shared_ptr<Model<double>>& m, bool add_3d) {
     
     pFile = FOPEN(file, "rt");
     if (!pFile) {
-        throw invalid_argument("cannot open misdp data file");
+        cerr <<"Cannot open misdp data file " << file << endl;
+        return g;
     }
     CBFdata data = { 0, };
     // Keyword OBJ should exist!