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
36void
37ngets(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
84int
85fgetstr(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