lib: Add path_expandvars() internal API call

1 files changed, 45 insertions, 0 deletions

diff --git a/host/lib/utils/pathslib.cpp b/host/lib/utils/pathslib.cpp
new file mode 100644
index 000000000..cbb0d0917
--- /dev/null
+++ b/host/lib/utils/pathslib.cpp
@@ -0,0 +1,45 @@
+//
+// Copyright 2018 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: GPL-3.0+
+//
+
+#include <uhd/config.hpp>
+#include <uhdlib/utils/paths.hpp>
+
+#ifdef BOOST_MSVC
+#  include <windows.h>
+#else
+#  include <wordexp.h>
+#endif
+
+std::string uhd::path_expandvars(const std::string& path)
+{
+    if (path.empty()) {
+        return path;
+    }
+#ifdef BOOST_MSVC
+    constexpr size_t max_pathlen = 4096;
+    char result[max_pathlen];
+    const size_t result_len = ExpandEnvironmentStrings(
+        path.c_str(),
+        &result[0],
+        max_pathlen
+    );
+    if (result == 0) {
+        return path;
+    }
+    return std::string(result, result+result_len);
+#else
+    wordexp_t p;
+    std::string return_value;
+    if (wordexp(path.c_str(), &p, 0) == 0 && p.we_wordc > 0) {
+        return_value = std::string(p.we_wordv[0]);
+    } else {
+        return_value = path;
+    }
+    wordfree(&p);
+    return return_value;
+#endif
+}
+