Thread: user input echo off

>How would I accomplish this?
Depends on your system. Quite a few Windows compilers support getch and some form of conio.h. On Unix or Linux systems you can fake it using something like this:

Code:

#include <termios.h>
#include <unistd.h>

int setecho(int fd, int onoff)
{
    struct termios t;

    if (tcgetattr(fd, &t) == -1)
        return -1;

    if (onoff == 0)
        t.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
    else
        t.c_lflag |= (ECHO | ECHOE | ECHOK | ECHONL);

    if (tcsetattr(fd, TCSANOW, &t) == -1)
        return -1;
}

Code:

setecho(STDIN_FILENO, 0);

/* Read password */

setecho(STDIN_FILENO, 1);

On Unix systems you can also use getpass from <unistd.h>:

Code:

#include <unistd.h>

int main(void)
{
    char *p;
    p = getpass("Password: ");
}

Originally posted by threahdead
the function getpass() is obsolete and should not be used anymore.

Can you provide a little more info on that?

fine... no system...

Code:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>


int spawn(char* program, char** arg_list)
{
  pid_t child_pid;
  child_pid = fork();
  if(child_pid!=0) //parent process
    return child_pid;
  else //child process (exec_only)
  {
    execvp(program,arg_list);
    fprintf(stderr,"an error has occured in execvp\n");
    abort();
  }
}
int main()
{
  char* list1 = {"stty","-echo",NULL}; //OFF list
  char* list2 = {"stty","echo",NULL}; //ON list
  /* prompt code here */
  spawn("stty",list1); //turn echo off
  /* place code here */
  spawn("stty",list2); //turn echo on
  return 0;
}

>is says so right in its own man pages!!
Not mine, I use the latest stable version of FreeBSD.

Originally posted by Prelude
>is says so right in its own man pages!!
Not mine, I use the latest stable version of FreeBSD.

From "IEEE Std 1003.1, 2003 Edition"

The following features, marked legacy or obsolescent in the base documents, are not carried forward into IEEE Std 1003.1-2001. Other features from the base documents marked legacy or obsolescent are carried forward unless otherwise noted.

From XSH5, the following legacy interfaces, headers, and external variables are not carried forward:

advance(), brk(), chroot(), compile(), cuserid(), gamma(), getdtablesize(), getpagesize(), getpass(), getw(), putw(), re_comp(), re_exec(), regcmp(), regex(), sbrk(), sigstack(), step(), ttyslot(), valloc(), wait3(), <re_comp.h>, <regexp.h>, <varargs.h>, loc1, __loc1, loc2, locs