fgetc requires 'enter' key pressed twice on WINDOWS

Question

I'm trying to make a password input mask function that's portable between windows, linux, and osx. So far I have code that works perfectly in linux and osx, but windows is giving me one issue.

Does anyone know why in windows fgetc requires me to press the enter key twice before it exits the while loop?

static int get_password(char *password, int mask)
{
    int max_pass_len = 512;

#ifdef _WIN32
    HANDLE hstdin = GetStdHandle(STD_INPUT_HANDLE);
    DWORD mode = 0;
    DWORD prev_mode = 0;
    GetConsoleMode(hstdin, &mode);
    GetConsoleMode(hstdin, &prev_mode);
    SetConsoleMode(hstdin, mode & ~(ENABLE_LINE_INPUT | ENABLE_PROCESSED_INPUT));
#else
    static struct termios prev_terminal;
    static struct termios terminal;

    tcgetattr(STDIN_FILENO, &prev_terminal);

    memcpy (&terminal, &prev_terminal, sizeof(struct termios));
    terminal.c_lflag &= ~(ICANON | ECHO);
    terminal.c_cc[VTIME] = 0;
    terminal.c_cc[VMIN] = 1;
    tcsetattr(STDIN_FILENO, TCSANOW, &terminal);
#endif

    size_t idx = 0;         /* index, number of chars in read   */
    int c = 0;

    const char BACKSPACE = 8;
    const char RETURN = 13;

    /* read chars from fp, mask if valid char specified */
    while (((c = fgetc(stdin)) != '\n' && c != RETURN && c != EOF && idx < max_pass_len - 1) ||
            (idx == max_pass_len - 1 && c == 127))
    {
        if (c != 127 && c != BACKSPACE) {
            if (31 < mask && mask < 127)    /* valid ascii char */
                fputc(mask, stdout);
            password[idx++] = c;
        } else if (idx > 0) {         /* handle backspace (del)   */
            if (31 < mask && mask < 127) {
                fputc(0x8, stdout);
                fputc(' ', stdout);
                fputc(0x8, stdout);
            }
            password[--idx] = 0;
        }
    }
    password[idx] = 0; /* null-terminate   */

// go back to the previous settings
#ifdef _WIN32
    SetConsoleMode(hstdin, prev_mode);
#else
    tcsetattr(STDIN_FILENO, TCSANOW, &prev_terminal);
#endif

    return idx; /* number of chars in passwd    */
}

```

Answer 1

Problem resolved using ReadConsole

#ifdef _WIN32
    long unsigned int char_read = 0;
    while ((ReadConsole(hstdin, &c, 1, &char_read, NULL) && c != '\n' && c != RETURN && c != EOF && idx < max_pass_len - 1) ||
            (idx == max_pass_len - 1 && c == BACKSPACE))
#else
    while (((c = fgetc(stdin)) != '\n' && c != EOF && idx < max_pass_len - 1) ||
            (idx == max_pass_len - 1 && c == 127))
#endif