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
32 #include "stand.h"
33
34 /* gets() with constrained input length */
35
36 void
ngets(char * buf,int n)37 ngets(char *buf, int n)
38 {
39 int c;
40 char *lp;
41
42 for (lp = buf;;) {
43 c = getchar();
44 if (c == -1)
45 break;
46 switch (c & 0177) {
47 case '\n':
48 case '\r':
49 *lp = '\0';
50 putchar('\n');
51 return;
52 case '\b':
53 case '\177':
54 if (lp > buf) {
55 lp--;
56 putchar('\b');
57 putchar(' ');
58 putchar('\b');
59 }
60 break;
61 case 'r'&037: {
62 char *p;
63
64 putchar('\n');
65 for (p = buf; p < lp; ++p)
66 putchar(*p);
67 break;
68 }
69 case 'u'&037:
70 case 'w'&037:
71 lp = buf;
72 putchar('\n');
73 break;
74 default:
75 if ((n < 1) || ((lp - buf) < n - 1)) {
76 *lp++ = c;
77 putchar(c);
78 }
79 }
80 }
81 /*NOTREACHED*/
82 }
83
84 int
fgetstr(char * buf,int size,int fd)85 fgetstr(char *buf, int size, int fd)
86 {
87 char c;
88 int err, len;
89
90 size--; /* leave space for terminator */
91 len = 0;
92 while (size != 0) {
93 err = read(fd, &c, sizeof(c));
94 if (err < 0) /* read error */
95 return(-1);
96 if (err == 0) { /* EOF */
97 if (len == 0)
98 return(-1); /* nothing to read */
99 break;
100 }
101 if ((c == '\r') || /* line terminators */
102 (c == '\n'))
103 break;
104 *buf++ = c; /* keep char */
105 size--;
106 len++;
107 }
108 *buf = 0;
109 return(len);
110 }
111
112