From: Heesob Park Date: 2010-09-30T15:30:21+09:00 Subject: [ruby-core:32650] [Ruby 1.9-Bug#3891][Open] Unexpected result of ENV[""] on Windows Bug #3891: Unexpected result of ENV[""] on Windows http://redmine.ruby-lang.org/issues/show/3891 Author: Heesob Park Status: Open, Priority: Low Category: core, Target version: 1.9.x ruby -v: ruby 1.9.3dev (2010-09-29 trunk 29366) [i386-mswin32_90] I noticed that ENV[""] returns "::=::\\" on Windows. This bug exists almost all versions of ruby from 1.8.x to 1.9.x C:\>ruby -ve 'p ENV[""]' ruby 1.8.6 (2010-02-04 patchlevel 398) [i386-mingw32] "::=::\\" C:\work>ruby -ve 'p ENV[""]' ruby 1.9.3dev (2010-09-29 trunk 29366) [i386-mswin32_90] "::=::\\" Here is a simple patch: --- win32.c 2010-09-30 15:13:59.000000000 +0900 +++ win32.c.new 2010-09-30 15:16:31.000000000 +0900 @@ -3900,6 +3900,7 @@ int len = strlen(name); char *env; + if (len==0) return NULL; if (envarea) FreeEnvironmentStrings(envarea); envarea = GetEnvironmentStrings(); ---------------------------------------- http://redmine.ruby-lang.org