1 /* $NetBSD: gets.c,v 1.15 2019/03/31 20:08:45 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 "stand.h"
35
36 #if 0 /* harmful */
37 void
38 gets(char *buf)
39 {
40 kgets(buf, (size_t)-1);
41 }
42 #endif
43
44 void
kgets(char * buf,size_t size)45 kgets(char *buf, size_t size)
46 {
47 int c;
48 char *lp;
49
50 for (lp = buf;;) {
51 if ((size_t)(lp - buf) == size) {
52 lp--;
53 *lp = '\0';
54 return;
55 }
56 switch (c = getchar() & 0177) {
57 case '\n':
58 case '\r':
59 *lp = '\0';
60 putchar('\n');
61 return;
62 case '\b':
63 case '\177':
64 if (lp > buf) {
65 lp--;
66 putchar('\b');
67 putchar(' ');
68 putchar('\b');
69 }
70 break;
71 #if HASH_ERASE
72 case '#':
73 if (lp > buf)
74 --lp;
75 break;
76 #endif
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 #if AT_ERASE
86 case '@':
87 #endif
88 case 'u' & 037:
89 case 'w' & 037:
90 lp = buf;
91 putchar('\n');
92 break;
93 default:
94 *lp++ = c;
95 putchar(c);
96 break;
97 }
98 }
99 /*NOTREACHED*/
100 }
101