+static void exec_op(struct ftp *ftp, int op, const char *arg)
+{
+ switch(op) {
+ case FTP_PWD:
+ ftp_pwd(ftp);
+ break;
+
+ case FTP_CHDIR:
+ ftp_chdir(ftp, arg);
+ break;
+
+ case FTP_MKDIR:
+ ftp_mkdir(ftp, arg);
+ break;
+
+ case FTP_RMDIR:
+ ftp_rmdir(ftp, arg);
+ break;
+
+ case FTP_DEL:
+ ftp_delete(ftp, arg);
+ break;
+
+ case FTP_LIST:
+ ftp_list(ftp);
+ break;
+
+ case FTP_RETR:
+ ftp_retrieve(ftp, arg);
+ break;
+
+ case FTP_STORE:
+ ftp_store(ftp, arg);
+ break;
+
+ default:
+ break;
+ }
+}
+
+static void exec_queued(struct ftp *ftp)
+{
+ struct ftp_op *fop;
+
+ if(!(fop = ftp->qhead)) {
+ return;
+ }
+
+ if(ftp->qtail == fop) {
+ ftp->qhead = ftp->qtail = 0;
+ } else {
+ ftp->qhead = ftp->qhead->next;
+ }
+
+ exec_op(ftp, fop->op, fop->arg);
+
+ free(fop->arg);
+ free(fop);
+}
+
+
+int ftp_queue(struct ftp *ftp, int op, const char *arg)
+{
+ struct ftp_op *fop;
+
+ if(!ftp->qhead) {
+ exec_op(ftp, op, arg);
+ return 0;
+ }
+
+ if(!(fop = malloc(sizeof *fop))) {
+ return -1;
+ }
+ if(!(fop->arg = strdup(arg))) {
+ free(fop);
+ return -1;
+ }
+ fop->op = op;
+ fop->next = 0;
+
+ ftp->qtail->next = fop;
+ ftp->qtail = fop;
+ return 0;
+}
+
+int ftp_waitresp(struct ftp *ftp, time_t timeout)