Small native code reorganization

native/jni/utils/misc.hpp

@@ -0,0 +1,108 @@
+#pragma once
+
+#include <pthread.h>
+#include <string>
+#include <functional>
+#include <string_view>
+
+#define UID_ROOT   0
+#define UID_SHELL  2000
+
+#define str_contains(s, ss) ((ss) != nullptr && (s).find(ss) != std::string::npos)
+#define str_starts(s, ss) ((ss) != nullptr && (s).compare(0, strlen(ss), ss) == 0)
+
+class mutex_guard {
+public:
+	explicit mutex_guard(pthread_mutex_t &m): mutex(&m) {
+		pthread_mutex_lock(mutex);
+	}
+
+	explicit mutex_guard(pthread_mutex_t *m): mutex(m) {
+		pthread_mutex_lock(mutex);
+	}
+
+	~mutex_guard() {
+		pthread_mutex_unlock(mutex);
+	}
+
+private:
+	pthread_mutex_t *mutex;
+};
+
+class run_finally {
+public:
+	explicit run_finally(std::function<void()> &&fn): fn(std::move(fn)) {}
+
+	void disable() { fn = nullptr; }
+
+	~run_finally() { if (fn) fn(); }
+
+private:
+	std::function<void()> fn;
+};
+
+template <typename T>
+class reversed_container {
+public:
+	reversed_container(T &base) : base(base) {}
+	decltype(std::declval<T>().rbegin()) begin() { return base.rbegin(); }
+	decltype(std::declval<T>().crbegin()) begin() const { return base.crbegin(); }
+	decltype(std::declval<T>().crbegin()) cbegin() const { return base.crbegin(); }
+	decltype(std::declval<T>().rend()) end() { return base.rend(); }
+	decltype(std::declval<T>().crend()) end() const { return base.crend(); }
+	decltype(std::declval<T>().crend()) cend() const { return base.crend(); }
+private:
+	T &base;
+};
+
+template <typename T>
+reversed_container<T> reversed(T &base) {
+	return reversed_container<T>(base);
+}
+
+int parse_int(const char *s);
+static inline int parse_int(std::string s) { return parse_int(s.data()); }
+static inline int parse_int(std::string_view s) { return parse_int(s.data()); }
+
+int new_daemon_thread(void *(*start_routine) (void *), void *arg = nullptr,
+					  const pthread_attr_t *attr = nullptr);
+int new_daemon_thread(std::function<void()> &&fn);
+
+struct exec_t {
+	bool err = false;
+	int fd = -2;
+	void (*pre_exec)() = nullptr;
+	int (*fork)() = xfork;
+	const char **argv = nullptr;
+};
+
+int exec_command(exec_t &exec);
+template <class ...Args>
+int exec_command(exec_t &exec, Args &&...args) {
+	const char *argv[] = {args..., nullptr};
+	exec.argv = argv;
+	return exec_command(exec);
+}
+int exec_command_sync(exec_t &exec);
+template <class ...Args>
+int exec_command_sync(exec_t &exec, Args &&...args) {
+	const char *argv[] = {args..., nullptr};
+	exec.argv = argv;
+	return exec_command_sync(exec);
+}
+template <class ...Args>
+int exec_command_sync(Args &&...args) {
+	exec_t exec{};
+	return exec_command_sync(exec, args...);
+}
+
+bool ends_with(const std::string_view &s1, const std::string_view &s2);
+int fork_dont_care();
+int fork_no_zombie();
+int strend(const char *s1, const char *s2);
+char *rtrim(char *str);
+void init_argv0(int argc, char **argv);
+void set_nice_name(const char *name);
+uint32_t binary_gcd(uint32_t u, uint32_t v);
+int switch_mnt_ns(int pid);
+void gen_rand_str(char *buf, int len, bool varlen = true);