implement memcpy

4 files changed, 103 insertions, 70 deletions

diff --git a/libs/kstd/CMakeLists.txt b/libs/kstd/CMakeLists.txt
index 1f140f6..77b12a9 100644
--- a/libs/kstd/CMakeLists.txt
+++ b/libs/kstd/CMakeLists.txt
@@ -5,6 +5,7 @@ set(KSTD_LIBC_SYMBOLS
     "abort"
     "strlen"
     "memcmp"
+    "memcpy"
 )
 
 target_sources("kstd" PRIVATE
@@ -33,6 +34,7 @@ target_sources("kstd" PUBLIC
     "include/kstd/os/print.hpp"
 
     "include/kstd/asm_ptr"
+    "include/kstd/cstring"
     "include/kstd/format"
     "include/kstd/memory"
     "include/kstd/mutex"
diff --git a/libs/kstd/include/kstd/cstring b/libs/kstd/include/kstd/cstring
new file mode 100644
index 0000000..e97ecac
--- /dev/null
+++ b/libs/kstd/include/kstd/cstring
@@ -0,0 +1,19 @@
+#ifndef KSTD_CSTRING
+#define KSTD_CSTRING
+
+#include <cstddef>
+
+namespace kstd::libc
+{
+
+  extern "C"
+  {
+    auto memcpy(void * dest, void const * src, std::size_t size) -> void *;
+    auto memmove(void * dest, void const * src, std::size_t size) -> void *;
+    auto memcmp(void const * lhs, void const * rhs, std::size_t size) -> std::size_t;
+    auto strlen(char const * string) -> std::size_t;
+  }
+
+}  // namespace kstd::libc
+
+#endif
\ No newline at end of file
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