Function RunCommand

Source/cmExecProgramCommand.cxx:125–287

namespace {
bool RunCommand(std::string command, std::string& output, int& retVal,
                char const* dir, bool verbose, Encoding encoding)
{
  if (cmSystemTools::GetRunCommandOutput()) {
    verbose = false;
  }

#if defined(_WIN32) && !defined(__CYGWIN__)
  // if the command does not start with a quote, then
  // try to find the program, and if the program can not be
  // found use system to run the command as it must be a built in
  // shell command like echo or dir
  if (!command.empty() && command[0] == '\"') {
    // count the number of quotes
    int count = 0;
    for (char c : command) {
      if (c == '\"') {
        count++;
        if (count > 2) {
          break;
        }
      }
    }
    // if there are more than two double quotes use
    // GetShortPathName, the cmd.exe program in windows which
    // is used by system fails to execute if there are more than
    // one set of quotes in the arguments
    if (count > 2) {
      cmsys::RegularExpression quoted("^\"([^\"]*)\"[ \t](.*)");
      if (quoted.find(command)) {
        std::string shortCmd;
        std::string cmd = quoted.match(1);
        std::string args = quoted.match(2);
        if (!cmSystemTools::FileExists(cmd)) {
          shortCmd = cmd;
        } else if (!cmSystemTools::GetShortPath(cmd, shortCmd)) {
          cmSystemTools::Error("GetShortPath failed for " + cmd);
          return false;
        }
        shortCmd += " ";
        shortCmd += args;

        command = shortCmd;
      } else {
        cmSystemTools::Error("Could not parse command line with quotes " +
                             command);
      }
    }
  }
#endif

  // Allocate a process instance.
  cmsysProcess* cp = cmsysProcess_New();
  if (!cp) {
    cmSystemTools::Error("Error allocating process instance.");
    return false;
  }