openpilot_comma/selfdrive/common/utilpp.h

#ifndef UTILPP_H
#define UTILPP_H

#include <cstdio>
#include <unistd.h>

#include <string>
#include <memory>
#include <sstream>
#include <fstream>

#ifdef __x86_64
#include <linux/limits.h>
#endif

namespace util {

inline bool starts_with(std::string s, std::string prefix) {
  return s.compare(0, prefix.size(), prefix) == 0;
}

template<typename ... Args>
inline std::string string_format( const std::string& format, Args ... args ) {
    size_t size = snprintf( nullptr, 0, format.c_str(), args ... ) + 1;
    std::unique_ptr<char[]> buf( new char[ size ] ); 
    snprintf( buf.get(), size, format.c_str(), args ... );
    return std::string( buf.get(), buf.get() + size - 1 );
}

inline std::string read_file(std::string fn) {
  std::ifstream t(fn);
  std::stringstream buffer;
  buffer << t.rdbuf();
  return buffer.str();
}

inline std::string tohex(const uint8_t* buf, size_t buf_size) {
  std::unique_ptr<char[]> hexbuf(new char[buf_size*2+1]);
  for (int i=0; i<buf_size; i++) {
    sprintf(&hexbuf[i*2], "%02x", buf[i]);
  }
  hexbuf[buf_size*2] = 0;
  return std::string(hexbuf.get(), hexbuf.get() + buf_size*2);
}

inline std::string base_name(std::string const & path) {
  size_t pos = path.find_last_of("/");
  if (pos == std::string::npos) return path;
  return path.substr(pos + 1);
}

inline std::string dir_name(std::string const & path) {
  size_t pos = path.find_last_of("/");
  if (pos == std::string::npos) return "";
  return path.substr(0, pos);
}

inline std::string readlink(std::string path) {
    char buff[PATH_MAX];
    ssize_t len = ::readlink(path.c_str(), buff, sizeof(buff)-1);
    if (len != -1) {
      buff[len] = '\0';
      return std::string(buff);
    }
    return "";
}

}

#endif