4.3BSD-UWisc/src/lib/libc/gen/getpass.c

#if defined(LIBC_RCS) && !defined(lint)
static char rcs_id[] =
	"$Header: getpass.c,v 1.3 86/09/08 14:43:10 tadl Exp $";
#endif
/*
 * RCS info
 *	$Locker:  $
 */
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getpass.c	5.2 (Berkeley) 3/9/86";
#endif LIBC_SCCS and not lint

#include <stdio.h>
#include <signal.h>
#include <sgtty.h>

char *
getpass(prompt)
char *prompt;
{
	struct sgttyb ttyb;
	int flags;
	register char *p;
	register c;
	FILE *fi;
	static char pbuf[9];
	int (*signal())();
	int (*sig)();

	if ((fi = fdopen(open("/dev/tty", 2), "r")) == NULL)
		fi = stdin;
	else
		setbuf(fi, (char *)NULL);
	sig = signal(SIGINT, SIG_IGN);
	ioctl(fileno(fi), TIOCGETP, &ttyb);
	flags = ttyb.sg_flags;
	ttyb.sg_flags &= ~ECHO;
	ioctl(fileno(fi), TIOCSETP, &ttyb);
	fprintf(stderr, "%s", prompt); fflush(stderr);
	for (p=pbuf; (c = getc(fi))!='\n' && c!=EOF;) {
		if (p < &pbuf[8])
			*p++ = c;
	}
	*p = '\0';
	fprintf(stderr, "\n"); fflush(stderr);
	ttyb.sg_flags = flags;
	ioctl(fileno(fi), TIOCSETP, &ttyb);
	signal(SIGINT, sig);
	if (fi != stdin)
		fclose(fi);
	return(pbuf);
}