src/cmd_out.cc


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#include <cstdio>
#include <memory>
#include <stdexcept>
#include <string>
#include <array>

std::string cmd_out(const char* cmd) {
  std::array<char, 128> buffer;
  std::string result;
  std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);
  if (!pipe) {
    throw std::runtime_error("popen() failed!");
  }
  while (fgets(buffer.data(), static_cast<int>(buffer.size()), pipe.get()) != nullptr) {
    result += buffer.data();
  }
  return result;
}