getpass.c revision 722:636b850d4ee9 
1255597Sdes/*
2255597Sdes * CDDL HEADER START
3255597Sdes *
4255809Sdes * The contents of this file are subject to the terms of the
5255597Sdes * Common Development and Distribution License, Version 1.0 only
6255597Sdes * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 1987 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1984 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30
31#pragma ident	"%Z%%M%	%I%	%E% SMI"
32
33/*LINTLIBRARY*/
34#include <stdio.h>
35#include <signal.h>
36#include <termios.h>
37#include <unistd.h>
38
39extern void setbuf();
40extern int	fclose(FILE *);
41extern int	fprintf(FILE *, char *, ...);
42extern int	findiop();
43extern int ioctl();
44static int intrupt;
45
46static void	catch(void);
47
48#define	MAXPASSWD	8	/* max significant characters in password */
49
50char *
51getpass(char *prompt)
52{
53	struct termios ttyb;
54	long flags;
55	char *p;
56	int c;
57	FILE	*fi;
58	static char pbuf[ MAXPASSWD + 1 ];
59	struct sigvec osv, sv;
60
61	if((fi = fopen("/dev/tty", "r")) == NULL)
62#ifdef S5EMUL
63		return((char*)NULL);
64#else
65		fi = stdin;
66#endif
67	else
68		setbuf(fi, (char*)NULL);
69	sv.sv_handler = catch;
70	sv.sv_mask = 0;
71	sv.sv_flags = SV_INTERRUPT;
72	(void) sigvec(SIGINT, &sv, &osv);
73	intrupt = 0;
74	(void) ioctl(fileno(fi), TCGETS, &ttyb);
75	flags = ttyb.c_lflag;
76	ttyb.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
77	(void) ioctl(fileno(fi), TCSETSF, &ttyb);
78	(void) fputs(prompt, stderr);
79	p = pbuf;
80	while( !intrupt  &&
81		(c = getc(fi)) != '\n'  &&  c != '\r'  &&  c != EOF ) {
82		if(p < &pbuf[ MAXPASSWD ])
83			*p++ = c;
84	}
85	*p = '\0';
86	ttyb.c_lflag = flags;
87	(void) ioctl(fileno(fi), TCSETSW, &ttyb);
88	(void) putc('\n', stderr);
89	(void) sigvec(SIGINT, &osv, (struct sigvec *)NULL);
90	if(fi != stdin)
91		(void) fclose(fi);
92#ifdef S5EMUL	/* XXX - BOTH versions should probably do this! */
93	if(intrupt)
94		(void) kill(getpid(), SIGINT);
95#endif
96	return(pbuf);
97}
98
99static void
100catch(void)
101{
102	++intrupt;
103}
104