int Shell::execute(char *command)
{
char *argv[MAX_ARGV];
char tmp[128];
ShellCommand *cmd;
Size argc;
int pid, status;
/* Valid argument? */
if (!strlen(command))
{
return EXIT_SUCCESS;
}
/* Attempt to extract arguments. */
argc = parse(command, argv, MAX_ARGV);
/* Ignore comments */
if (argv[0][0] == '#')
return EXIT_SUCCESS;
/* Do we have a matching ShellCommand? */
if (!(cmd = ShellCommand::byName(argv[0])))
{
/* If not, try to execute it as a file directly. */
if ((pid = forkexec(argv[0], (const char **) argv)) != -1)
{
waitpid(pid, &status, 0);
return status;
}
/* Try to find it on the livecd filesystem. (temporary hardcoded PATH) */
else if (snprintf(tmp, sizeof(tmp), "/bin/%s", argv[0]) &&
(pid = forkexec(tmp, (const char **) argv)) != -1)
{
waitpid(pid, &status, 0);
return status;
}
else
printf("forkexec '%s' failed: %s\r\n", argv[0],
strerror(errno));
}
/* Enough arguments given? */
else if (argc - 1 < cmd->getMinimumParams())
{
printf("%s: not enough arguments (%u required)\r\n",
cmd->getName(), cmd->getMinimumParams());
}
/* Execute it. */
else
{
return cmd->execute(argc - 1, argv + 1);
}
/* Not successful. */
return EXIT_FAILURE;
}
bool Shell::mainLoop(std::istream &in, Environment &env) const
{
InputParser iParser;
ShellCommand::Args args;
const Shell *oldShell = env.shell();
env.shell() = this;
bool success = true;
do {
if(env.interactive()) cout << endl << "dbxml> ";
env.lineNo() += iParser.parse(in, args);
string command = args.empty() ? string("") : args.front();
try {
ShellCommand *cmd = findCommand(command);
if (cmd)
cmd->execute(args, env);
else if(!args.empty()) {
throw CommandException("Unknown command");
}
}
//catches XmlException
catch(exception &e) {
cerr << env.streamName() << ":" << env.lineNo() <<
": " << command << " failed, ";
cerr << e.what() << endl;
success = false;
if(!env.interactive() && !env.ignoreErrors())
env.quit() = true;
}
catch(...) {
cerr << env.streamName() << ":" << env.lineNo() <<
": " << command << " failed" << endl;
success = false;
if(!env.interactive() && !env.ignoreErrors())
env.quit() = true;
}
} while(!env.quit() && !in.eof() && !env.sigBlock().isInterrupted());
env.shell() = oldShell;
return success;
}