1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)gets.c 8.1 (Berkeley) 6/4/93
33 * $FreeBSD: src/lib/libc/stdio/gets.c,v 1.17 2007/01/09 00:28:06 imp Exp $
34 */
35
36 #include "namespace.h"
37 #include <unistd.h>
38 #include <stdio.h>
39 #include "un-namespace.h"
40 #include "libc_private.h"
41 #include "local.h"
42
43 __warn_references(gets, "warning: this program uses gets(), which is unsafe.");
44
45 char *
gets(char * buf)46 gets(char *buf)
47 {
48 int c;
49 char *s;
50 static int warned;
51 static char w[] =
52 "warning: this program uses gets(), which is unsafe.\n";
53
54 FLOCKFILE(stdin);
55 ORIENT(stdin, -1);
56 if (!warned) {
57 _write(STDERR_FILENO, w, sizeof(w) - 1);
58 warned = 1;
59 }
60 for (s = buf; (c = __sgetc(stdin)) != '\n';)
61 if (c == EOF)
62 if (s == buf) {
63 FUNLOCKFILE(stdin);
64 return (NULL);
65 } else
66 break;
67 else
68 *s++ = c;
69 *s = 0;
70 FUNLOCKFILE(stdin);
71 return (buf);
72 }
73