tgets.c revision 1.6 
1/*	$NetBSD: tgets.c,v 1.6 2005/12/11 12:17:04 christos 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
37int
38tgets(buf)
39	char *buf;
40{
41	register int c;
42	register char *lp;
43
44#ifdef	USE_SCAN
45	int i;
46
47#define	SCANWAIT	10000
48#define	PWAIT		500
49	for (i = 0; i < PWAIT; i++) {
50		if ((c = cnscan()) != -1)
51			goto next;
52		delay(SCANWAIT);
53	}
54	return (-1);
55next:
56#else
57	c = getchar();
58#endif
59	for (lp = buf;; c = getchar()) {
60		switch (c & 0177) {
61		case '\n':
62		case '\r':
63			*lp = '\0';
64			putchar('\n');
65			return 0;
66		case '\b':
67		case '\177':
68			if (lp > buf) {
69				lp--;
70				putchar('\b');
71				putchar(' ');
72				putchar('\b');
73			}
74			break;
75		case 'r'&037: {
76			register char *p;
77
78			putchar('\n');
79			for (p = buf; p < lp; ++p)
80				putchar(*p);
81			break;
82		}
83		case 'u'&037:
84		case 'w'&037:
85			lp = buf;
86			putchar('\n');
87			break;
88		default:
89			*lp++ = c;
90			putchar(c);
91		}
92	}
93}
94