From 481f9ba1aee62fea092184f2243d210a8686781f Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 14 Jun 2018 18:13:04 +0200
Subject: Add portable environment variable manipulation functions

---
 libbutl/utility.mxx | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'libbutl/utility.mxx')

diff --git a/libbutl/utility.mxx b/libbutl/utility.mxx
index 740b411..252a4b4 100644
--- a/libbutl/utility.mxx
+++ b/libbutl/utility.mxx
@@ -35,6 +35,9 @@ export module butl.utility;
 import std.core;
 import std.io;
 #endif
+import butl.optional;
+#else
+#include <libbutl/optional.mxx>
 #endif
 
 #include <libbutl/export.hxx>
@@ -183,6 +186,25 @@ LIBBUTL_MODEXPORT namespace butl
   bool
   eof (std::istream&);
 
+  // Environment variables.
+  //
+  optional<std::string>
+  getenv (const std::string&);
+
+  // Throw system_error on failure.
+  //
+  // Note that on Windows setting an empty value usets the variable.
+  //
+  LIBBUTL_SYMEXPORT
+  void
+  setenv (const std::string& name, const std::string& value);
+
+  // Throw system_error on failure.
+  //
+  LIBBUTL_SYMEXPORT
+  void
+  unsetenv (const std::string&);
+
   // Key comparators (i.e., to be used in sets, maps, etc).
   //
   struct compare_c_string
-- 
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