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