Programming

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

struct termios save;

void echoOff()
{
  struct termios term;

  tcgetattr( 0, &save );
  term = save;
  term.c_lflag &= (~ECHO);
  tcsetattr( 0, TCSANOW, &term );
}

void echoOn()
{
  tcsetattr( 0, TCSANOW, &save );
}

int main()
{
  char password[30];

  echoOff();
  fgets( password, 30, stdin );
  echoOn();

  printf("Hello dude, your Password was: %s\n", password );

  return 0;
}

// this one line
fgets( password, 30, stdin );
// could be like this for example:
int ch=0;
while( (ch=fgetc(stdin)) !=EOF)
{
    printf("%c", (ch=='\n') ? ch : '*');
    if(ch=='\n') break;
}
// .... rest of code

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

struct termios save;

void echoOff()
{
  struct termios term;

  tcgetattr( 0, &save );
  term = save;
  term.c_lflag &= ~(ICANON | ECHO);;
  term.c_cc[VMIN]=0;
  term.c_cc[VTIME]=0;
  
  tcsetattr( 0, TCSANOW, &term );
}

void echoOn()
{
  tcsetattr( 0, TCSANOW, &save );
}

int kbd_rd(const int fd)  /* wait 2 seconds to read keyboard stroke */
{
    fd_set set_read;
    int maxfd = fd + 1;
    int ch=0;
    char buf[4]={0x0};
    struct timeval tv_tmout={0,0};
    tv_tmout.tv_sec=99;
    FD_ZERO(&set_read);
    FD_SET(fd, &set_read);
    select(maxfd, &set_read, NULL, NULL, &tv_tmout);
    if (FD_ISSET(fd, &set_read))
        read(fd, buf, 1);
    ch=buf[0];

    return ch;
}


int main()
{
  char password[30]={0x0};
  char *p=password;
  int ch=0;
  int fd=fileno(stdin);
  
  echoOff();
  while( (ch=kbd_rd(fd)) )
  {
      printf("%c", (ch=='\n') ? ch : '*');
      fflush(stdout);
      if(ch=='\n') break;
      *p=ch;
      p++;
  }
  
  echoOn();

  printf("Hello dude, your Password was: %s\n", password );

  return 0;
}