fread

gistfile1.c

 char *command1= "/usr/bin/dscl";

char *args1[] = {".","-read","/SharePoints/FolderName","directory_path",nil};

    FILE *pipe = nil;

                            err = AuthorizationCreate(nil,
                              kAuthorizationEmptyEnvironment,
                              kAuthorizationFlagDefaults,
                              &authorizationRef);

        err = AuthorizationExecuteWithPrivileges(authorizationRef,
                                               command,
                                              kAuthorizationFlagDefaults,
                                              args1,
                                              &pipe);    

char buffer[2048];
while (!feof(pipe)) {
  size_t readBytes = fread(buffer, sizeof(buffer[0]), sizeof(buffer) / sizeof(buffer[0]), pipe);
  // use buffer here
}
fclose(pipe);