1 /* $NetBSD: gets.c,v 1.6 1995/10/11 21:16:57 pk Exp $ */
2
3 /*-
4 * Copyright (c) 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include "stand.h"
33
34 /* gets() with constrained input length, for passwords */
35
36 void
pwgets(char * buf,int n,int hide)37 pwgets(char *buf, int n, int hide)
38 {
39 int c;
40 char *lp;
41
42 for (lp = buf;;)
43 switch (c = getchar() & 0177) {
44 case '\n':
45 case '\r':
46 *lp = '\0';
47 putchar('\n');
48 return;
49 case '\b':
50 case '\177':
51 if (lp > buf) {
52 lp--;
53 if (hide == 0) {
54 putchar('\b');
55 putchar(' ');
56 putchar('\b');
57 }
58 }
59 break;
60 case 'u'&037:
61 case 'w'&037:
62 lp = buf;
63 putchar('\n');
64 break;
65 default:
66 if ((n < 1) || ((lp - buf) < n - 1)) {
67 *lp++ = c;
68 if (hide == 0) {
69 putchar('*');
70 }
71 }
72 }
73 /*NOTREACHED*/
74 }
75