From 62bf2eef72854750c7325d2e2c6e92562a522e16 Mon Sep 17 00:00:00 2001
From: Lukas Oesch <lukasoesch20@gmail.com>
Date: Mon, 2 Mar 2026 23:43:09 +0100
Subject: implement memcpy

---
 libs/kstd/src/libc/stdlib.cpp |  36 ++++++-------
 libs/kstd/src/libc/string.cpp | 116 +++++++++++++++++++++++-------------------
 2 files changed, 82 insertions(+), 70 deletions(-)

(limited to 'libs/kstd/src')

diff --git a/libs/kstd/src/libc/stdlib.cpp b/libs/kstd/src/libc/stdlib.cpp
index 4a5c91f..bb40605 100644
--- a/libs/kstd/src/libc/stdlib.cpp
+++ b/libs/kstd/src/libc/stdlib.cpp
@@ -1,19 +1,19 @@
-#include "kstd/os/error.hpp"
-
-namespace kstd::libc
-{
-
-  extern "C"
-  {
-    [[noreturn]] auto abort() -> void
-    {
-      kstd::os::abort();
-    }
-
-    [[noreturn, gnu::weak]] auto free(void *) -> void
-    {
-      kstd::os::panic("Tried to call free.");
-    }
-  }
-
+#include "kstd/os/error.hpp"
+
+namespace kstd::libc
+{
+
+  extern "C"
+  {
+    [[noreturn]] auto abort() -> void
+    {
+      kstd::os::abort();
+    }
+
+    [[noreturn, gnu::weak]] auto free(void *) -> void
+    {
+      kstd::os::panic("Tried to call free.");
+    }
+  }
+
 }  // namespace kstd::libc
\ No newline at end of file
diff --git a/libs/kstd/src/libc/string.cpp b/libs/kstd/src/libc/string.cpp
index b7d4c6b..4e264f9 100644
--- a/libs/kstd/src/libc/string.cpp
+++ b/libs/kstd/src/libc/string.cpp
@@ -1,53 +1,65 @@
-#include <algorithm>
-#include <bit>
-#include <cstddef>
-#include <iterator>
-#include <span>
-
-namespace kstd::libc
-{
-
-  extern "C"
-  {
-    auto strlen(char const * string) -> std::size_t
-    {
-      return std::distance(string, std::ranges::find(string, nullptr, '\0'));
-    }
-
-    auto memcmp(void const * lhs, void const * rhs, std::size_t size) -> std::size_t
-    {
-      auto left_span = std::span{static_cast<std::byte const *>(lhs), size};
-      auto right_span = std::span{static_cast<std::byte const *>(rhs), size};
-      auto mismatched = std::ranges::mismatch(left_span, right_span);
-
-      if (mismatched.in1 == left_span.end())
-      {
-        return 0;
-      }
-
-      return std::bit_cast<char>(*mismatched.in1) - std::bit_cast<char>(*mismatched.in2);
-    }
-
-    auto memmove(void * dest, void const * src, std::size_t size) -> void *
-    {
-      auto dest_span = std::span{static_cast<std::byte *>(dest), size};
-      auto src_span = std::span{static_cast<std::byte const *>(src), size};
-      if (dest < src)
-      {
-        for (std::size_t i = 0; i < size; ++i)
-        {
-          dest_span[i] = src_span[i];
-        }
-      }
-      else
-      {
-        for (std::size_t i = size; i > 0; --i)
-        {
-          dest_span[i - 1] = src_span[i - 1];
-        }
-      }
-      return dest;
-    }
-  }
-
+#include <kstd/cstring>
+
+#include <algorithm>
+#include <bit>
+#include <cstddef>
+#include <iterator>
+#include <span>
+
+namespace kstd::libc
+{
+
+  auto memcpy(void * dest, void const * src, std::size_t size) -> void *
+  {
+    auto dest_span = std::span{static_cast<std::byte *>(dest), size};
+    auto src_span = std::span{static_cast<std::byte const *>(src), size};
+
+    for (std::size_t i = 0; i < size; ++i)
+    {
+      dest_span[i] = src_span[i];
+    }
+
+    return dest;
+  }
+
+  auto strlen(char const * string) -> std::size_t
+  {
+    return std::distance(string, std::ranges::find(string, nullptr, '\0'));
+  }
+
+  auto memcmp(void const * lhs, void const * rhs, std::size_t size) -> std::size_t
+  {
+    auto left_span = std::span{static_cast<std::byte const *>(lhs), size};
+    auto right_span = std::span{static_cast<std::byte const *>(rhs), size};
+    auto mismatched = std::ranges::mismatch(left_span, right_span);
+
+    if (mismatched.in1 == left_span.end())
+    {
+      return 0;
+    }
+
+    return std::bit_cast<char>(*mismatched.in1) - std::bit_cast<char>(*mismatched.in2);
+  }
+
+  auto memmove(void * dest, void const * src, std::size_t size) -> void *
+  {
+    auto dest_span = std::span{static_cast<std::byte *>(dest), size};
+    auto src_span = std::span{static_cast<std::byte const *>(src), size};
+    if (dest < src)
+    {
+      for (std::size_t i = 0; i < size; ++i)
+      {
+        dest_span[i] = src_span[i];
+      }
+    }
+    else
+    {
+      for (std::size_t i = size; i > 0; --i)
+      {
+        dest_span[i - 1] = src_span[i - 1];
+      }
+    }
+    return dest;
+  }
+
 }  // namespace kstd::libc
\ No newline at end of file
-- 
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