1 files changed, 37 insertions, 0 deletions
diff --git a/libk/string/memory.cc b/libk/string/memory.cc
new file mode 100644
index 0000000..5b8a1f8
--- /dev/null
+++ b/libk/string/memory.cc
@@ -0,0 +1,37 @@
+#include <types.h>
+
+extern "C" void* memcpy(void* dstptr, const void* srcptr, const size_t n) {
+  auto* dst = static_cast<uint8_t*>(dstptr);
+  const auto* src = static_cast<const uint8_t*>(srcptr);
+  for (size_t i = 0; i < n; ++i) dst[i] = src[i];
+  return dstptr;
+}
+
+extern "C" void* memset(void* bufptr, const int value, const size_t n) {
+  auto* buf = static_cast<uint8_t*>(bufptr);
+  for (size_t i = 0; i < n; ++i) buf[i] = static_cast<uint8_t>(value);
+  return bufptr;
+}
+
+extern "C" void* memmove(void* dstptr, const void* srcptr, const size_t n) {
+  auto* dst = static_cast<uint8_t*>(dstptr);
+  const auto* src = static_cast<const uint8_t*>(srcptr);
+  if (dst < src) {
+    for (size_t i = 0; i < n; ++i) dst[i] = src[i];
+  } else {
+    for (size_t i = n; i != 0; i--) dst[i - 1] = src[i - 1];
+  }
+  return dstptr;
+}
+
+extern "C" int memcmp(const void* aptr, const void* bptr, const size_t n) {
+  const auto* a = static_cast<const uint8_t*>(aptr);
+  const auto* b = static_cast<const uint8_t*>(bptr);
+  for (size_t i = 0; i < n; ++i) {
+    if (a[i] < b[i])
+      return -1;
+    else if (b[i] < a[i])
+      return 1;
+  }
+  return 0;
+}