zadavani hesla v C

[Karel Zak]

On Wed, Dec 11, 2002 at 10:59:47AM +0000, Jiri Caha wrote:
> Nevite jak v C naprogramovat zadavani hesla, tj. 
> bez vypisujicich se znaku??? (aby to fungovalo 
> na vsech typech terminalu, curses mi premazava 
> v nekterych terminalech obrazovku)

 Pouziti:

    heslo = simple_prompt("Davaj heslo:", 10, FALSE);

 
 Odzkouseno na nekolika OS a nekolika tisic instalacich :-)
 
 
/*
 * psql - the PostgreSQL interactive terminal
 *
 * Copyright 2000 by PostgreSQL Global Development Group
 */
    
#ifdef HAVE_TERMIOS_H
#include <termios.h>
#endif

extern char *simple_prompt(const char *prompt, int maxlen, bool echo);

char *
simple_prompt(const char *prompt, int maxlen, bool echo)
{
	int			length;
	char	   *destination;
	FILE	   *termin,
			   *termout;

#ifdef HAVE_TERMIOS_H
	struct termios t_orig,
				t;
#endif

	destination = (char *) malloc(maxlen + 2);
	if (!destination)
		return NULL;

	/*
	 * Do not try to collapse these into one "w+" mode file. Doesn't work
	 * on some platforms (eg, HPUX 10.20).
	 */
	termin = fopen("/dev/tty", "r");
	termout = fopen("/dev/tty", "w");
	if (!termin || !termout)
	{
		if (termin)
			fclose(termin);
		if (termout)
			fclose(termout);
		termin = stdin;
		termout = stderr;
	}

#ifdef HAVE_TERMIOS_H
	if (!echo)
	{
		tcgetattr(fileno(termin), &t);
		t_orig = t;
		t.c_lflag &= ~ECHO;
		tcsetattr(fileno(termin), TCSAFLUSH, &t);
	}
#endif

	if (prompt)
	{
		fputs(gettext(prompt), termout);
		fflush(termout);
	}

	if (fgets(destination, maxlen, termin) == NULL)
		destination[0] = '\0';

	length = strlen(destination);
	if (length > 0 && destination[length - 1] != '\n')
	{
		/* eat rest of the line */
		char		buf[128];
		int			buflen;

		do
		{
			if (fgets(buf, sizeof(buf), termin) == NULL)
				break;
			buflen = strlen(buf);
		} while (buflen > 0 && buf[buflen - 1] != '\n');
	}

	if (length > 0 && destination[length - 1] == '\n')
		/* remove trailing newline */
		destination[length - 1] = '\0';

#ifdef HAVE_TERMIOS_H
	if (!echo)
	{
		tcsetattr(fileno(termin), TCSAFLUSH, &t_orig);
		fputs("\n", termout);
		fflush(termout);
	}
#endif

	if (termin != stdin)
	{
		fclose(termin);
		fclose(termout);
	}

	return destination;
}

    Karel

-- 
 Karel Zak  <zakkr na zf.jcu.cz>
 http://home.zf.jcu.cz/~zakkr/