From 6655de189f97a95a341488b4c8d7c97a270b4c13 Mon Sep 17 00:00:00 2001
From: Timothy Flynn <trflynn89@pm.me>
Date: Tue, 7 Nov 2023 11:11:39 -0500
Subject: [PATCH] LibCore: Add a Core::System wrapper around `unsetenv`

---
 Userland/Libraries/LibCore/System.cpp | 13 +++++++++++++
 Userland/Libraries/LibCore/System.h   |  1 +
 2 files changed, 14 insertions(+)

diff --git a/Userland/Libraries/LibCore/System.cpp b/Userland/Libraries/LibCore/System.cpp
index 935a4b73f5..08434654be 100644
--- a/Userland/Libraries/LibCore/System.cpp
+++ b/Userland/Libraries/LibCore/System.cpp
@@ -1639,6 +1639,19 @@ ErrorOr<void> setenv(StringView name, StringView value, bool overwrite)
     return {};
 }
 
+ErrorOr<void> unsetenv(StringView name)
+{
+    auto builder = TRY(StringBuilder::create());
+    TRY(builder.try_append(name));
+    TRY(builder.try_append('\0'));
+
+    // Note the explicit null terminator above.
+    auto rc = ::unsetenv(builder.string_view().characters_without_null_termination());
+    if (rc < 0)
+        return Error::from_errno(errno);
+    return {};
+}
+
 ErrorOr<void> putenv(StringView env)
 {
 #ifdef AK_OS_SERENITY
diff --git a/Userland/Libraries/LibCore/System.h b/Userland/Libraries/LibCore/System.h
index 08e9f20e8f..716b66ecf6 100644
--- a/Userland/Libraries/LibCore/System.h
+++ b/Userland/Libraries/LibCore/System.h
@@ -229,6 +229,7 @@ ErrorOr<void> setgroups(ReadonlySpan<gid_t>);
 ErrorOr<void> mknod(StringView pathname, mode_t mode, dev_t dev);
 ErrorOr<void> mkfifo(StringView pathname, mode_t mode);
 ErrorOr<void> setenv(StringView, StringView, bool);
+ErrorOr<void> unsetenv(StringView);
 ErrorOr<void> putenv(StringView);
 ErrorOr<int> posix_openpt(int flags);
 ErrorOr<void> grantpt(int fildes);