getpass.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static	char	*sccsid = "@(#)getpass.c	4.1	(ULTRIX)	7/3/90";
#endif lint

/************************************************************************
 *									*
 *			Copyright (c) 1985 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/
/************************************************************************
 *			Modification History				*
 *									*
 *	David L Ballenger, 16-Apr-1985					*
 * 0001	Change definition of signal handlers from function returning	*
 *	void to function returning int.					*
 *									*
 *	Mark A. Parenti, 02-Jun-1988					*
 * 0002 Change definition of signal handlers back to void for 		*
 *	standards compliance.						*
 ************************************************************************/

/*	@(#)getpass.c	1.4	*/
/*	3.0 SID #	1.4	*/
/*LINTLIBRARY*/
#include <stdio.h>
#include <signal.h>
#include <termio.h>

extern void setbuf();
extern FILE *fopen();
extern int fclose(), fprintf(), findiop();
extern int kill(), ioctl(), getpid();
static int intrupt;

char *
getpass(prompt)
char	*prompt;
{
	struct termio ttyb;
	unsigned short flags;
	register char *p;
	register int c;
	FILE	*fi;
	static char pbuf[9];
	void	(*sig)(), catch();	/* dlb0001 */

	if((fi = fopen("/dev/tty", "r")) == NULL)
		return((char*)NULL);
	else
		setbuf(fi, (char*)NULL);
	sig = signal(SIGINT, catch);
	intrupt = 0;
	(void) ioctl(fileno(fi), TCGETA, &ttyb);
	flags = ttyb.c_lflag;
	ttyb.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
	(void) ioctl(fileno(fi), TCSETAF, &ttyb);
	(void) fputs(prompt, stderr);
	for(p=pbuf; !intrupt && (c = getc(fi)) != '\n' && c != EOF; ) {
		if(p < &pbuf[8])
			*p++ = c;
	}
	*p = '\0';
	(void) putc('\n', stderr);
	ttyb.c_lflag = flags;
	(void) ioctl(fileno(fi), TCSETA, &ttyb);
	(void) signal(SIGINT, sig);
	if(fi != stdin)
		(void) fclose(fi);
	if(intrupt)
		(void) kill(getpid(), SIGINT);
	return(pbuf);
}

static void	/*dlb001*/
catch()
{
	++intrupt;
}