密码以*号显示

 #include
 #include
 #include
 #include
 #include
 #include
 int getch()
 {
     int c=0;
     struct termios org_opts, new_opts;
     int res=0;
     //-----  store old settings -----------
     res=tcgetattr(STDIN_FILENO, &org_opts);
     assert(res==0);
     //---- set new terminal parms --------
     memcpy(&new_opts, &org_opts, sizeof(new_opts));
     new_opts.c_lflag &= ~(ICANON | ECHO | ECHOE | ECHOK | ECHONL | ECHOPRT | ECHOKE | ICRNL);
     tcsetattr(STDIN_FILENO, TCSANOW, &new_opts);
     c=getchar();
     //------  restore old settings ---------
     res=tcsetattr(STDIN_FILENO, TCSANOW, &org_opts);
     assert(res==0);
     return c;
 }

 int  main()
 {
     int i;
     char *pd = (char *)malloc(sizeof(char) * 128);

     for(i = 0; ; i++)
     {
     pd[i] = getch();

     if(pd[i] == '\n')
     {
         pd[i] = '\0';

         break;
     }

     if(pd[i] == 127) //删除
     {
         printf("\b \b");

         i = i - 2;
     }
     else
     {
         printf("*");
     }
     if(i<0)
     {
         pd[0]='\0';
     }
     }

     printf("\ncode:%s\n",pd);
     return 0;
 }