add: base for CMake building (non-working)

This commit will have a rebase soon.

zygiskd/src/root_impl/common.c

@@ -0,0 +1,54 @@
+#include <sys/types.h>
+
+#include "kernelsu.h"
+
+#include "common.h"
+
+static enum RootImpl ROOT_IMPL = None;
+
+void root_impls_setup(void) {
+  enum RootImplState ksu_version = ksu_get_kernel_su();
+
+  enum RootImpl impl = None;
+
+  if (ksu_version == Supported) impl = KernelSU;
+
+  ROOT_IMPL = impl;
+}
+
+enum RootImpl get_impl(void) {
+  return ROOT_IMPL;
+}
+
+bool uid_granted_root(uid_t uid) {
+  switch (get_impl()) {
+    case KernelSU: {
+      return ksu_uid_granted_root(uid);
+    }
+    default: {
+      return false;
+    }
+  }
+}
+
+bool uid_should_umount(uid_t uid) {
+  switch (get_impl()) {
+    case KernelSU: {
+      return ksu_uid_should_umount(uid);
+    }
+    default: {
+      return false;
+    }
+  }
+}
+
+bool uid_is_manager(uid_t uid) {
+  switch (get_impl()) {
+    case KernelSU: {
+      return ksu_uid_is_manager(uid);
+    }
+    default: {
+      return false;
+    }
+  }
+}