linux c隐藏输入 termios.h

参考

教程
https://terminalroot.com/how-to-hide-input-via-cli-with-cpp/?ref=morioh.com&utm_source=morioh.com

man信息#include <termios.h>
https://pubs.opengroup.org/onlinepubs/7908799/xsh/termios.h.html

举例

#include <iostream>
#include <termios.h>
#include <unistd.h>
/* https://man7.org/linux/man-pages/man0/termios.h.0p.html
The <termios.h> header shall contain the definitions used by the
terminal I/O interfaces (see Chapter 11, General Terminal
Interface for the structures and names defined).*/

using namespace std;

int main()
{
    string pswd;
    string stdpswd = "1234";

    // set attribute of stdin: hide input pswd
    termios oldt;
    tcgetattr(STDIN_FILENO, &oldt);
    termios newt = oldt;
    newt.c_lflag &= ~ECHO;                   // ECHO bit: Enables echo. If this flag is set, characters are echoed as they are received.
    tcsetattr(STDIN_FILENO, TCSANOW, &newt); // TCSANOW: Change attributes immediately.

    while (1)
    {
        cout << "Enter password: ";
        char c;
        while ((c = getchar()) != EOF && c != '\n' && c != '\r')
        {
            pswd.push_back(c);
        }
        if (feof(stdin))
        {
            cout << "End of stdin!" << endl;
            return 0;
        }
        cout << endl;
        if (pswd == stdpswd)
        {
            break;
        }
        pswd.clear();
        cout << "Wrong password." << endl;
    }

    // recover attribute
    tcsetattr(STDIN_FILENO, TCSANOW, &oldt);

    cout << pswd << endl;

    return 0;
}