From 84c51f5b164939eec95c15d511f72c60af7783be Mon Sep 17 00:00:00 2001
From: _cry64 <them@dobutterfliescry.net>
Date: Sun, 29 Mar 2026 00:01:59 +1000
Subject: [PATCH] add SliceExt

---
 nixide/src/stdext/mod.rs   |  2 ++
 nixide/src/stdext/slice.rs | 43 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 nixide/src/stdext/slice.rs

diff --git a/nixide/src/stdext/mod.rs b/nixide/src/stdext/mod.rs
index e4c5bd6..cdf4416 100644
--- a/nixide/src/stdext/mod.rs
+++ b/nixide/src/stdext/mod.rs
@@ -1,3 +1,5 @@
 mod cchar_ptr;
+mod slice;
 
 pub(crate) use cchar_ptr::{AsCPtr, CCharPtrExt};
+pub(crate) use slice::SliceExt;
diff --git a/nixide/src/stdext/slice.rs b/nixide/src/stdext/slice.rs
new file mode 100644
index 0000000..d9bc198
--- /dev/null
+++ b/nixide/src/stdext/slice.rs
@@ -0,0 +1,43 @@
+use std::iter;
+use std::ptr::null_mut;
+
+use crate::util::wrappers::AsInnerPtr;
+
+pub trait SliceExt<T, S> {
+    #[allow(unused)]
+    fn as_c_array(&self) -> *mut *mut S;
+
+    #[allow(unused)]
+    fn into_c_array(self) -> *mut *mut S;
+}
+
+impl<T, S> SliceExt<T, S> for &[&T]
+where
+    T: AsInnerPtr<S>,
+{
+    fn as_c_array(&self) -> *mut *mut S {
+        let mut ptrs: Vec<*mut S> = self
+            .into_iter()
+            .map(|x| unsafe { x.as_ptr() })
+            .chain(iter::once(null_mut()))
+            .collect();
+
+        let ptr = ptrs.as_mut_ptr();
+        std::mem::forget(ptrs);
+
+        ptr
+    }
+
+    fn into_c_array(self) -> *mut *mut S {
+        let mut ptrs: Vec<*mut S> = self
+            .into_iter()
+            .map(|x| unsafe { x.as_ptr() })
+            .chain(iter::once(null_mut()))
+            .collect();
+
+        let ptr = ptrs.as_mut_ptr();
+        std::mem::forget(ptrs);
+
+        ptr
+    }
+}