Mot de passe en C

#include <termios.h>
#include <strings.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>

#define READ_BUFF_SIZE  42

void                    read_password(char *buff)
{
  struct termios        old;
  struct termios        new;
  int                   nb;

  buff[0] = '\0';
  tcgetattr(STDIN_FILENO, &old);
  bcopy(&old, &new, sizeof(struct termios));
  new.c_lflag &= ~ECHO;
  tcsetattr(STDIN_FILENO, TCSADRAIN, &new);
  fgets(buff, READ_BUFF_SIZE, stdin);
  nb = strlen(buff) - 1;
  if (buff[nb] == '\n')
    buff[nb] = '\0';
  tcsetattr(STDIN_FILENO, TCSADRAIN, &old);
}

int     main(void)
{
  char  buff[READ_BUFF_SIZE];

  read_password(buff);
  printf("Mon pass entré: %s\n", buff);
  return 0;
}

#include <stdio.h>
#include <conio.h>

#define N 500

int main(void)
{
    char s[N] = "", c = 0;
    int i = 0;

    while ((c = getch()) != '\r' && i < N-1)
    {
        if (c != '\b')
        {
            putchar('*');
            s[i++] = c;
        }
        else
        {
            printf("\b \b"); 
            i--;
        }
    }
    s[i] = '\0';
    printf("\n%s\n", s);
    
    return 0;
}