tgets.c revision 1.2 
1/*	$NetBSD: tgets.c,v 1.2 1998/01/19 03:01:04 sakamoto 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *	@(#)gets.c	8.1 (Berkeley) 6/11/93
36 */
37
38#include "stand.h"
39
40int
41tgets(buf)
42	char *buf;
43{
44	register int c;
45	register int i;
46	register char *lp;
47
48#ifdef	USE_SCAN
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);
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			register 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