From 43e501ca56ca6d0c45b0695c8ebdc5fda757a867 Mon Sep 17 00:00:00 2001
From: Philip Top <phlptp@gmail.com>
Date: Sun, 5 Jun 2022 06:37:16 -0700
Subject: [PATCH] Fix an issue where an error was generated if just a file name
 was supplied to the split_program_name parsing

---
 include/CLI/Validators.hpp | 2 +-
 tests/StringParseTest.cpp  | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/CLI/Validators.hpp b/include/CLI/Validators.hpp
index 1281997ae..a03cbe5e3 100644
--- a/include/CLI/Validators.hpp
+++ b/include/CLI/Validators.hpp
@@ -1163,7 +1163,7 @@ inline std::pair<std::string, std::string> split_program_name(std::string comman
     }
 
     // strip the program name
-    vals.second = (esp != std::string::npos) ? commandline.substr(esp + 1) : std::string{};
+    vals.second = (esp < commandline.length() - 1) ? commandline.substr(esp + 1) : std::string{};
     ltrim(vals.second);
     return vals;
 }
diff --git a/tests/StringParseTest.cpp b/tests/StringParseTest.cpp
index 48a173530..88b42a42d 100644
--- a/tests/StringParseTest.cpp
+++ b/tests/StringParseTest.cpp
@@ -89,6 +89,15 @@ TEST_CASE_METHOD(TApp, "ProgNameWithSpace", "[stringparse]") {
     CHECK(app.get_name() == "Foo Bar");
 }
 
+// From GitHub issue #739 https://github.com/CLIUtils/CLI11/issues/739
+TEST_CASE_METHOD(TApp, "ProgNameOnly", "[stringparse]") {
+
+    app.add_flag("--foo");
+    CHECK_NOTHROW(app.parse("\"C:\\example.exe\"", true));
+
+    CHECK(app.get_name() == "C:\\example.exe");
+}
+
 TEST_CASE_METHOD(TApp, "ProgNameWithSpaceEmbeddedQuote", "[stringparse]") {
 
     app.add_flag("--foo");