1 /* $NetBSD: gets.c,v 1.6 1995/10/11 21:16:57 pk 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 <sys/cdefs.h>
35
36 #include "stand.h"
37
38 /* gets() with constrained input length */
39
40 void
ngets(char * buf,int n)41 ngets(char *buf, int n)
42 {
43 int c;
44 char *lp;
45
46 for (lp = buf; ; ) {
47 c = getchar();
48 if (c == -1)
49 break;
50 switch (c & 0177) {
51 case '\n':
52 case '\r':
53 *lp = '\0';
54 putchar('\n');
55 return;
56 case '\b':
57 case '\177':
58 if (lp > buf) {
59 lp--;
60 putchar('\b');
61 putchar(' ');
62 putchar('\b');
63 }
64 break;
65 case 'r' & 037: {
66 char *p;
67
68 putchar('\n');
69 for (p = buf; p < lp; ++p)
70 putchar(*p);
71 break;
72 }
73 case 'u' & 037:
74 case 'w' & 037:
75 lp = buf;
76 putchar('\n');
77 break;
78 default:
79 if ((n < 1) || ((lp - buf) < n - 1)) {
80 *lp++ = c;
81 putchar(c);
82 }
83 }
84 }
85 /*NOTREACHED*/
86 }
87
88 int
fgetstr(char * buf,int size,int fd)89 fgetstr(char *buf, int size, int fd)
90 {
91 char c;
92 int err, len;
93
94 size--; /* leave space for terminator */
95 len = 0;
96 while (size != 0) {
97 err = read(fd, &c, sizeof (c));
98 if (err < 0) /* read error */
99 return (-1);
100 if (err == 0) { /* EOF */
101 if (len == 0)
102 return (-1); /* nothing to read */
103 break;
104 }
105 if ((c == '\r') || /* line terminators */
106 (c == '\n'))
107 break;
108 *buf++ = c; /* keep char */
109 size--;
110 len++;
111 }
112 *buf = 0;
113 return (len);
114 }
115