spns #33658: in case environment variable does not exist, getenv returns nullptr...

Test rewrite parameter first, then check if environment variable is nullptr, and finally check if environment variable exists but is empty

Useful for setting MeshGems license

diff --git a/src/Basics/Basics_Utils.cxx b/src/Basics/Basics_Utils.cxx
index 1725a319c6ec28a3607c3ccb799d034e77acc087..63fe64c6976c0aad57cea59c8e38980e29acbed1 100644 (file)
--- a/src/Basics/Basics_Utils.cxx
+++ b/src/Basics/Basics_Utils.cxx
@@ -175,7 +175,7 @@ namespace Kernel_Utils
   {
     std::stringstream sstr;
     sstr<<name<<'='<<value;
-    if(rewrite || std::string(getenv(name)).length() == 0)
+    if(rewrite || getenv(name) == nullptr || std::string(getenv(name)).length() == 0)
       return _putenv(sstr.str().c_str());
     else return -1;
   }