zebra命令行部分實現

從zebra裏提取的命令行實現。

• 示例：

// 定義：
DEFUN (cmd_show_something, cmd_show_something_s,
      "show something",
      "Show something\n") {
    fprintf(stdout, "I whill show something...");
    return CMD_SUCCESS;
}

// 註冊：
install_element(VIEW_NODE, &cmd_show_something_s);

// 主函數：
void clitest_main(int argc, char *argv[]) {
    vtysh_main(argc, argv, NULL);
}

效果如下：

$ ./clitest

someApp (version V1.0).
Copyright 2018-2019 XXX.

ubuntu>
  exit  Exit current mode and down to previous mode
  list  Print command list
  quit  Exit current mode and down to previous mode
  show  Show something
ubuntu> show  something
I whill show something...
ubuntu> ex
$

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