tgets.c revision 1.2 
1/*	$NetBSD: tgets.c,v 1.2 2005/12/11 12:17:06 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
37#define USE_SCAN
38
39int
40tgets(buf)
41	char *buf;
42{
43	int c;
44	char *lp;
45
46#ifdef	USE_SCAN
47	int i;
48
49#define	SCANWAIT	10000
50#define	PWAIT		500
51	for (i = 0; i < PWAIT; i++) {
52		if ((c = cnscan()) != -1)
53			goto next;
54		delay(SCANWAIT / 32); /* XXX */
55	}
56	return (-1);
57next:
58#else
59	c = getchar();
60#endif
61	for (lp = buf;; c = getchar()) {
62		switch (c & 0177) {
63		case '\n':
64		case '\r':
65			*lp = '\0';
66			putchar('\n');
67			return 0;
68		case '\b':
69		case '\177':
70			if (lp > buf) {
71				lp--;
72				putchar('\b');
73				putchar(' ');
74				putchar('\b');
75			}
76			break;
77		case 'r' & 037: {
78			char *p;
79
80			putchar('\n');
81			for (p = buf; p < lp; ++p)
82				putchar(*p);
83			break;
84		}
85		case 'u' & 037:
86		case 'w' & 037:
87			lp = buf;
88			putchar('\n');
89			break;
90		default:
91			*lp++ = c;
92			putchar(c);
93		}
94	}
95}
96