mirror of https://github.com/polybar/polybar.git
109 lines
2.3 KiB
C++
109 lines
2.3 KiB
C++
#pragma once
|
|
|
|
#include <fcntl.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/stat.h>
|
|
#include <fstream>
|
|
|
|
#include "common.hpp"
|
|
#include "utils/scope.hpp"
|
|
|
|
LEMONBUDDY_NS
|
|
|
|
namespace file_util {
|
|
/**
|
|
* RAII file wrapper
|
|
*/
|
|
class file_ptr {
|
|
public:
|
|
/**
|
|
* Constructor: open file handler
|
|
*/
|
|
explicit file_ptr(const string& path, const string& mode = "a+")
|
|
: m_path(string(path)), m_mode(string(mode)) {
|
|
m_ptr = fopen(m_path.c_str(), m_mode.c_str());
|
|
}
|
|
|
|
/**
|
|
* Destructor: close file handler
|
|
*/
|
|
~file_ptr() {
|
|
if (m_ptr != nullptr)
|
|
fclose(m_ptr);
|
|
}
|
|
|
|
/**
|
|
* Logical operator testing if the file handler was created
|
|
*/
|
|
operator bool() {
|
|
return m_ptr != nullptr;
|
|
}
|
|
|
|
/**
|
|
* Call operator returning a pointer to the file handler
|
|
*/
|
|
FILE* operator()() {
|
|
return m_ptr;
|
|
}
|
|
|
|
protected:
|
|
FILE* m_ptr = nullptr;
|
|
string m_path;
|
|
string m_mode;
|
|
};
|
|
|
|
/**
|
|
* Checks if the given file exist
|
|
*/
|
|
inline auto exists(string filename) {
|
|
struct stat buffer;
|
|
return stat(filename.c_str(), &buffer) == 0;
|
|
}
|
|
|
|
/**
|
|
* Gets the contents of the given file
|
|
*/
|
|
inline auto get_contents(string filename) {
|
|
try {
|
|
std::ifstream ifs(filename);
|
|
string contents((std::istreambuf_iterator<char>(ifs)), (std::istreambuf_iterator<char>()));
|
|
return contents;
|
|
} catch (std::ios_base::failure& e) {
|
|
return string{""};
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Puts the given file descriptor into blocking mode
|
|
*/
|
|
inline auto set_block(int fd) {
|
|
int flags = fcntl(fd, F_GETFL, 0);
|
|
flags &= ~O_NONBLOCK;
|
|
if (fcntl(fd, F_SETFL, flags) == -1)
|
|
throw system_error("Failed to unset O_NONBLOCK");
|
|
}
|
|
|
|
/**
|
|
* Puts the given file descriptor into non-blocking mode
|
|
*/
|
|
inline auto set_nonblock(int fd) {
|
|
int flags = fcntl(fd, F_GETFL, 0);
|
|
flags |= O_NONBLOCK;
|
|
if (fcntl(fd, F_SETFL, flags) == -1)
|
|
throw system_error("Failed to set O_NONBLOCK");
|
|
}
|
|
|
|
/**
|
|
* Checks if the given file is a named pipe
|
|
*/
|
|
inline auto is_fifo(string filename) {
|
|
auto fileptr = make_unique<file_ptr>(filename);
|
|
int fd = fileno((*fileptr)());
|
|
struct stat statbuf;
|
|
fstat(fd, &statbuf);
|
|
return S_ISFIFO(statbuf.st_mode);
|
|
}
|
|
}
|
|
|
|
LEMONBUDDY_NS_END
|