[libgpiod][PATCH 3/5] bindings: cxx: provide line_request::chip_path()

[Bartosz Golaszewski <brgl@bgdev.pl>]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Provide a wrapper around gpiod_line_request_get_chip_path() for C++
bindings and update the tests.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 bindings/cxx/gpiodcxx/line-request.hpp    |  7 +++++++
 bindings/cxx/line-request.cpp             | 10 +++++++++-
 bindings/cxx/tests/tests-line-request.cpp |  6 ++++--
 3 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/bindings/cxx/gpiodcxx/line-request.hpp b/bindings/cxx/gpiodcxx/line-request.hpp
index c1e1520..dd8b5b9 100644
--- a/bindings/cxx/gpiodcxx/line-request.hpp
+++ b/bindings/cxx/gpiodcxx/line-request.hpp
@@ -14,6 +14,7 @@
 
 #include <chrono>
 #include <cstddef>
+#include <filesystem>
 #include <iostream>
 #include <memory>
 
@@ -75,6 +76,12 @@ public:
 	 */
 	void release();
 
+	/**
+	 * @brief Get the path of the chip this request was made on.
+	 * @return Path to the GPIO chip device.
+	 */
+	::std::filesystem::path chip_path() const;
+
 	/**
 	 * @brief Get the number of requested lines.
 	 * @return Number of lines in this request.
diff --git a/bindings/cxx/line-request.cpp b/bindings/cxx/line-request.cpp
index b0723c3..33e9d6e 100644
--- a/bindings/cxx/line-request.cpp
+++ b/bindings/cxx/line-request.cpp
@@ -63,6 +63,13 @@ GPIOD_CXX_API void line_request::release()
 	this->_m_priv->request.reset();
 }
 
+GPIOD_CXX_API ::std::filesystem::path line_request::chip_path() const
+{
+	this->_m_priv->throw_if_released();
+
+	return ::gpiod_line_request_get_chip_path(this->_m_priv->request.get());
+}
+
 GPIOD_CXX_API ::std::size_t line_request::num_lines() const
 {
 	this->_m_priv->throw_if_released();
@@ -222,7 +229,8 @@ GPIOD_CXX_API ::std::ostream& operator<<(::std::ostream& out, const line_request
 	if (!request)
 		out << "gpiod::line_request(released)";
 	else
-		out << "gpiod::line_request(num_lines=" << request.num_lines() <<
+		out << "gpiod::line_request(chip_path=\"" << request.chip_path() <<
+		       "\", num_lines=" << request.num_lines() <<
 		       ", line_offsets=" << request.offsets() <<
 		       ", fd=" << request.fd() <<
 		       ")";
diff --git a/bindings/cxx/tests/tests-line-request.cpp b/bindings/cxx/tests/tests-line-request.cpp
index d1a56ae..914a60a 100644
--- a/bindings/cxx/tests/tests-line-request.cpp
+++ b/bindings/cxx/tests/tests-line-request.cpp
@@ -468,14 +468,16 @@ TEST_CASE("line_request stream insertion operator works", "[line-request]")
 		.set_num_lines(4)
 		.build();
 
-	auto request = ::gpiod::chip(sim.dev_path())
+	auto chip = ::gpiod::chip(sim.dev_path());
+	auto request = chip
 		.prepare_request()
 		.add_line_settings({ 3, 1, 0, 2}, ::gpiod::line_settings())
 		.do_request();
 
 	::std::stringstream buf, expected;
 
-	expected << "gpiod::line_request(num_lines=4, line_offsets=gpiod::offsets(3, 1, 0, 2), fd=" <<
+	expected << "gpiod::line_request(chip_path=\"" << chip.path() <<
+		    "\", num_lines=4, line_offsets=gpiod::offsets(3, 1, 0, 2), fd=" <<
 		    request.fd() << ")";
 
 	SECTION("active request")
-- 
2.39.2