1 /* $NetBSD: tgets.c,v 1.5 2022/04/29 21:39:50 rin 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 * @(#)gets.c 8.1 (Berkeley) 6/11/93
32 */
33
34 #include <lib/libsa/stand.h>
35 #include "boot.h"
36
37 int
tgets(char * buf)38 tgets(char *buf)
39 {
40 register int c;
41 register char *lp;
42
43 #ifdef USE_SCAN
44 int i;
45
46 #define SCANDELAY 10000
47 #define SCANWAIT 500
48 for (i = 0; i < SCANWAIT; i++) {
49 if ((c = cnscan()) != -1)
50 goto next;
51 delay(SCANDELAY);
52 }
53 return (-1);
54 next:
55 #else
56 c = getchar();
57 #endif
58 for (lp = buf;; c = getchar()) {
59 switch (c & 0177) {
60 case '\n':
61 case '\r':
62 *lp = '\0';
63 putchar('\n');
64 return 0;
65 case '\b':
66 case '\177':
67 if (lp > buf) {
68 lp--;
69 putchar('\b');
70 putchar(' ');
71 putchar('\b');
72 }
73 break;
74 case 'r'&037: {
75 register char *p;
76
77 putchar('\n');
78 for (p = buf; p < lp; ++p)
79 putchar(*p);
80 break;
81 }
82 case 'u'&037:
83 case 'w'&037:
84 lp = buf;
85 putchar('\n');
86 break;
87 default:
88 *lp++ = c;
89 putchar(c);
90 }
91 }
92 }
93