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#define USE_SCAN
38
39int
40tgets(char *buf)
41{
42	int c;
43	char *lp;
44
45#ifdef	USE_SCAN
46	int i;
47
48#define	SCANDELAY	10000
49#define	SCANWAIT	500
50	for (i = 0; i < SCANWAIT; i++) {
51		if ((c = cnscan()) != -1)
52			goto next;
53		delay(SCANDELAY / 32); /* XXX */
54	}
55	return -1;
56next:
57#else
58	c = getchar();
59#endif
60	for (lp = buf;; c = getchar()) {
61		switch (c & 0177) {
62		case '\n':
63		case '\r':
64			*lp = '\0';
65			putchar('\n');
66			return 0;
67		case '\b':
68		case '\177':
69			if (lp > buf) {
70				lp--;
71				putchar('\b');
72				putchar(' ');
73				putchar('\b');
74			}
75			break;
76		case 'r' & 037: {
77			char *p;
78
79			putchar('\n');
80			for (p = buf; p < lp; ++p)
81				putchar(*p);
82			break;
83		}
84		case 'u' & 037:
85		case 'w' & 037:
86			lp = buf;
87			putchar('\n');
88			break;
89		default:
90			*lp++ = c;
91			putchar(c);
92		}
93	}
94}
95