uhd: paths: Add get_cal_data_path() API call

This points to the location where cal data is stored.

3 files changed, 25 insertions, 1 deletions

diff --git a/host/include/uhd/utils/paths.hpp b/host/include/uhd/utils/paths.hpp
index e5b451542..f55f584a5 100644
--- a/host/include/uhd/utils/paths.hpp
+++ b/host/include/uhd/utils/paths.hpp
@@ -29,6 +29,9 @@ UHD_API std::string get_lib_path(void);
 //! Get a string representing the system's pkg directory
 UHD_API std::string get_pkg_path(void);
 
+//! Get a string representing the location of the calibration database
+UHD_API std::string get_cal_data_path(void);
+
 //! Get UHD library paths
 UHD_API std::vector<fs::path> get_module_paths(void);
 
diff --git a/host/lib/utils/paths.cpp b/host/lib/utils/paths.cpp
index 326551c8c..ccf52f257 100644
--- a/host/lib/utils/paths.cpp
+++ b/host/lib/utils/paths.cpp
@@ -214,6 +214,25 @@ std::string uhd::get_lib_path(void)
 }
 #endif
 
+std::string uhd::get_cal_data_path(void)
+{
+    const std::string uhdcalib_path = get_env_var("UHD_CAL_DATA_PATH");
+    if (not uhdcalib_path.empty()) {
+        return uhdcalib_path;
+    }
+
+    std::string xdg_data_home_str = get_env_var("XDG_DATA_HOME", "");
+    fs::path xdg_data_home(xdg_data_home_str);
+    if (xdg_data_home_str.empty()) {
+        const std::string home = get_env_var("HOME", "");
+        xdg_data_home          = fs::path(home) / ".local" / "share";
+    }
+
+    // FIXME: This needs to check if paths make sense, work on Windows, etc.
+
+    fs::path cal_data_path = fs::path(xdg_data_home) / "uhd" / "cal_data";
+    return cal_data_path.string();
+}
 
 std::vector<fs::path> uhd::get_module_paths(void)
 {
diff --git a/host/tests/paths_test.cpp b/host/tests/paths_test.cpp
index 6ff496eb6..5115891b0 100644
--- a/host/tests/paths_test.cpp
+++ b/host/tests/paths_test.cpp
@@ -44,11 +44,13 @@ BOOST_AUTO_TEST_CASE(test_get_paths)
     const std::string tmp_path = get_tmp_path();
     const std::string app_path = get_app_path();
     const std::string pkg_path = get_pkg_path();
+    const std::string cal_path = get_cal_data_path();
     const auto module_paths    = get_module_paths();
 
     std::cout << "tmp_path: " << tmp_path << std::endl;
     std::cout << "app_path: " << app_path << std::endl;
     std::cout << "pkg_path: " << pkg_path << std::endl;
+    std::cout << "cal_path: " << cal_path << std::endl;
     for (const auto& module_path : module_paths) {
         std::cout << "module path: " << module_path << std::endl;
     }
@@ -63,5 +65,5 @@ BOOST_AUTO_TEST_CASE(test_get_paths)
 
     const std::string utility_error =
         print_utility_error("uhd_images_downloader", "--help");
-    std::cout << "utility_error: " << tmp_path << std::endl;
+    std::cout << "utility_error: " << utility_error << std::endl;
 }