Restructure the native module

Consolidate all code into the src folder

native/src/init/logging.rs

@@ -0,0 +1,37 @@
+use base::ffi::LogLevel;
+use base::*;
+use std::fmt::Arguments;
+
+extern "C" {
+    fn klog_write(msg: *const u8, len: i32);
+}
+
+pub fn setup_klog() {
+    const PREFIX: &[u8; 12] = b"magiskinit: ";
+    const PFX_LEN: usize = PREFIX.len();
+
+    fn klog_fmt(_: LogLevel, args: Arguments) {
+        let mut buf: [u8; 4096] = [0; 4096];
+        buf[..PFX_LEN].copy_from_slice(PREFIX);
+        let len = fmt_to_buf(&mut buf[PFX_LEN..], args) + PFX_LEN;
+        unsafe {
+            klog_write(buf.as_ptr(), len as i32);
+        }
+    }
+
+    fn klog_write_impl(_: LogLevel, msg: &[u8]) {
+        unsafe {
+            klog_write(msg.as_ptr(), msg.len() as i32);
+        }
+    }
+
+    let logger = Logger {
+        fmt: klog_fmt,
+        write: klog_write_impl,
+        flags: 0,
+    };
+    exit_on_error(false);
+    unsafe {
+        LOGGER = logger;
+    }
+}