1 /* $OpenBSD: getsn.c,v 1.5 2007/05/03 01:21:32 deraadt Exp $ */
2
3 /*
4 * Copyright (c) 1996 Theo de Raadt
5 * 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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 #include <sys/types.h>
30 #include <sys/systm.h>
31 #include <dev/cons.h>
32
33 int
34 getsn(char *cp, int size)
35 {
36 int len = 0, c;
37 char *lp = cp;
38
39 while (1) {
40 c = cngetc();
41 switch (c) {
42 case '\n':
43 case '\r':
44 printf("\n");
45 *lp++ = '\0';
46 return (len);
47 case '\b':
48 case '\177':
49 if (len) {
50 printf("\b \b");
51 --lp;
52 --len;
53 }
54 break;
55 case 'u' & 037:
56 while (len) {
57 printf("\b \b");
58 --lp;
59 --len;
60 }
61 break;
62 case '\t':
63 c = ' ';
64 default:
65 if (len + 1 >= size || c < ' ') {
66 printf("\007");
67 break;
68 }
69 printf("%c", c);
70 ++len;
71 *lp++ = c;
72 }
73 }
74 }