Implement APIC, RTC, basic ACPI parser and timer support

[lunaix-os.git] / lunaix-os / libs / klibc / string / mem.c

diff --git a/lunaix-os/libs/klibc/string/mem.c b/lunaix-os/libs/klibc/string/mem.c
new file mode 100755 (executable)
index 0000000..0b93a7d
--- /dev/null
+++ b/lunaix-os/libs/klibc/string/mem.c
@@ -0,0 +1,54 @@
+#include <stdint.h>
+#include <klibc/string.h>
+
+void*
+memcpy(void* dest, const void* src, size_t num)
+{
+    uint8_t* dest_ptr = (uint8_t*)dest;
+    const uint8_t* src_ptr = (const uint8_t*)src;
+    for (size_t i = 0; i < num; i++) {
+        *(dest_ptr + i) = *(src_ptr + i);
+    }
+    return dest;
+}
+
+void*
+memmove(void* dest, const void* src, size_t num)
+{
+    uint8_t* dest_ptr = (uint8_t*)dest;
+    const uint8_t* src_ptr = (const uint8_t*)src;
+    if (dest_ptr < src_ptr) {
+        for (size_t i = 0; i < num; i++) {
+            *(dest_ptr + i) = *(src_ptr + i);
+        }
+    } else {
+        for (size_t i = num; i != 0; i--) {
+            *(dest_ptr + i - 1) = *(src_ptr + i - 1);
+        }
+    }
+    return dest;
+}
+
+void*
+memset(void* ptr, int value, size_t num)
+{
+    uint8_t* c_ptr = (uint8_t*)ptr;
+    for (size_t i = 0; i < num; i++) {
+        *(c_ptr + i) = (uint8_t)value;
+    }
+    return ptr;
+}
+
+int
+memcmp(const void* ptr1, const void* ptr2, size_t num)
+{
+    uint8_t* p1 = (uint8_t*)ptr1;
+    uint8_t* p2 = (uint8_t*)ptr2;
+    for (size_t i = 0; i < num; i++) {
+        int diff = *(p1 + i) - *(p2 + i);
+        if (diff != 0) {
+            return diff;
+        }
+    }
+    return 0;
+}
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