From be22cf62670b3b7e92b9c06475bbb24f93819445 Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Fri, 16 Dec 2022 18:17:15 +0100
Subject: [PATCH] Introduce OwnedStringView

A managed String which uses RAII to free its contents. It's not a proper string though, since it's read-only.
So it's a StringView... but an owned one.

Can't be copied automatically, must be either moved or copied manually by calling clone() on it.
---
 luna/CMakeLists.txt                 |  1 +
 luna/include/luna/OwnedStringView.h | 27 ++++++++++++++++++++++
 luna/src/OwnedStringView.cpp        | 36 +++++++++++++++++++++++++++++
 3 files changed, 64 insertions(+)
 create mode 100644 luna/include/luna/OwnedStringView.h
 create mode 100644 luna/src/OwnedStringView.cpp

diff --git a/luna/CMakeLists.txt b/luna/CMakeLists.txt
index afdc8c8e..655dc333 100644
--- a/luna/CMakeLists.txt
+++ b/luna/CMakeLists.txt
@@ -9,6 +9,7 @@ set(FREESTANDING_SOURCES
     src/Bitmap.cpp
     src/Stack.cpp
     src/Alloc.cpp
+    src/OwnedStringView.cpp
 )
 
 set(SOURCES
diff --git a/luna/include/luna/OwnedStringView.h b/luna/include/luna/OwnedStringView.h
new file mode 100644
index 00000000..4dd59332
--- /dev/null
+++ b/luna/include/luna/OwnedStringView.h
@@ -0,0 +1,27 @@
+#pragma once
+
+class OwnedStringView
+{
+  public:
+    OwnedStringView(char* c_str);
+    OwnedStringView();
+    OwnedStringView(OwnedStringView&&);
+    OwnedStringView(const OwnedStringView&) = delete;
+    ~OwnedStringView();
+
+    Result<OwnedStringView> clone();
+
+    const char* chars()
+    {
+        return m_string;
+    }
+
+    usize length()
+    {
+        return m_length;
+    }
+
+  private:
+    char* m_string{nullptr};
+    usize m_length{0};
+};
\ No newline at end of file
diff --git a/luna/src/OwnedStringView.cpp b/luna/src/OwnedStringView.cpp
new file mode 100644
index 00000000..d81a30cf
--- /dev/null
+++ b/luna/src/OwnedStringView.cpp
@@ -0,0 +1,36 @@
+#include <luna/Alloc.h>
+#include <luna/OwnedStringView.h>
+#include <luna/String.h>
+
+OwnedStringView::OwnedStringView()
+{
+}
+
+OwnedStringView::OwnedStringView(OwnedStringView&& other)
+{
+    m_string = other.m_string;
+    m_length = other.m_length;
+
+    other.m_string = nullptr;
+}
+
+OwnedStringView::OwnedStringView(char* c_str)
+{
+    m_string = c_str;
+
+    if (m_string) { m_length = strlen(m_string); }
+}
+
+OwnedStringView::~OwnedStringView()
+{
+    if (m_string) destroy_array(m_string);
+}
+
+Result<OwnedStringView> OwnedStringView::clone()
+{
+    char* buf = TRY(make_array<char>(m_length + 1));
+
+    memcpy(buf, m_string, m_length + 1);
+
+    return OwnedStringView{buf};
+}
\ No newline at end of file