feat: formatter and oslog()

Kernel/Include/Lib/String.h

@@ -0,0 +1,18 @@
+#pragma once
+#include <types.h>
+#include <Lib/VAArgs.h>
+
+void* StringSet(BytePointer destination, ASCII value, Size count);
+void* MemoryCopy(void* destination, const void* source, Size count);
+
+Int32 StringCompare(const ASCII* firstString, const ASCII* secondString);
+Int32 StringCompareWithLimit(const ASCII* firstString, const ASCII* secondString, Size limit);
+
+ASCII* StringCopy(ASCII* destination, const ASCII* source);
+ASCII* StringCopyWithLimit(ASCII* destination, const ASCII* source, Size limit);
+
+Size StringGetLength(const ASCII* string);
+const ASCII* StringFindLastOccurrenceOfCharacter(const ASCII* string, ASCII separator);
+
+Int32 StringFormatVariadic(ASCII* string, Size size, const ASCII* format, va_list args);
+Int32 StringFormat(ASCII* destination, UInt64 size, const ASCII* format, ...);

Kernel/Include/Lib/VAArgs.h

@@ -0,0 +1,8 @@
+#pragma once
+
+typedef __builtin_va_list va_list;
+
+#define va_start(v, l) __builtin_va_start(v, l)
+#define va_end(v)      __builtin_va_end(v)
+#define va_arg(v, l)   __builtin_va_arg(v, l)
+#define va_copy(d, s)  __builtin_va_copy(d, s)

Kernel/Include/OS/Log.h

@@ -0,0 +1,8 @@
+#pragma once
+#include <types.h>
+
+enum {
+    kOSLogBufferSize = 1024,
+};
+
+void OSLog(const ASCII* format, ...);