gets.c revision 84221 
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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *	@(#)gets.c	8.1 (Berkeley) 6/11/93
36 */
37
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: head/lib/libstand/gets.c 84221 2001-09-30 22:28:01Z dillon $");
40
41#include "stand.h"
42
43/* gets() with constrained input length */
44
45void
46ngets(char *buf, int n)
47{
48    register int c;
49    register char *lp;
50
51    for (lp = buf;;)
52	switch (c = getchar() & 0177) {
53	case '\n':
54	case '\r':
55	    *lp = '\0';
56	    putchar('\n');
57	    return;
58	case '\b':
59	case '\177':
60	    if (lp > buf) {
61		lp--;
62		putchar('\b');
63		putchar(' ');
64		putchar('\b');
65	    }
66	    break;
67	case 'r'&037: {
68	    register char *p;
69
70	    putchar('\n');
71	    for (p = buf; p < lp; ++p)
72		putchar(*p);
73	    break;
74	}
75	case 'u'&037:
76	case 'w'&037:
77	    lp = buf;
78	    putchar('\n');
79	    break;
80	default:
81	    if ((n < 1) || ((lp - buf) < n)) {
82		*lp++ = c;
83		putchar(c);
84	    }
85	}
86    /*NOTREACHED*/
87}
88
89int
90fgetstr(char *buf, int size, int fd)
91{
92    char	c;
93    int		err, len;
94
95    size--;	/* leave space for terminator */
96    len = 0;
97    while (size != 0) {
98	err = read(fd, &c, sizeof(c));
99	if (err < 0)		/* read error */
100	    return(-1);
101	if (err == 0) {		/* EOF */
102	    if (len == 0)
103		return(-1);	/* nothing to read */
104	    break;
105	}
106	if ((c == '\r') ||	/* line terminators */
107	    (c == '\n'))
108	    break;
109	*buf++ = c;		/* keep char */
110	size--;
111	len++;
112    }
113    *buf = 0;
114    return(len);
115}
116
117