From 83a486a064fdb7a533d2bdac6f8b4b0e42e46546 Mon Sep 17 00:00:00 2001
From: Ryan Liptak <squeek502@hotmail.com>
Date: Thu, 20 Jan 2022 01:43:00 -0800
Subject: os.getenvW: Fix handling of special `=`-prefixed env vars

---
 lib/std/os.zig | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'lib')

diff --git a/lib/std/os.zig b/lib/std/os.zig
index ade20cc671..d04a938d5c 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -1726,6 +1726,12 @@ pub fn getenvW(key: [*:0]const u16) ?[:0]const u16 {
     while (ptr[i] != 0) {
         const key_start = i;
 
+        // There are some special environment variables that start with =,
+        // so we need a special case to not treat = as a key/value separator
+        // if it's the first character.
+        // https://devblogs.microsoft.com/oldnewthing/20100506-00/?p=14133
+        if (ptr[key_start] == '=') i += 1;
+
         while (ptr[i] != 0 and ptr[i] != '=') : (i += 1) {}
         const this_key = ptr[key_start..i];
 
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