Remove some unnecessary inclusions of <sys/cdefs.h> across the tree.
[dragonfly.git] / lib / libc / stdio / gets.c
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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.
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16 * 4. 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.
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31 *
32 * @(#)gets.c 8.1 (Berkeley) 6/4/93
e0f95098 33 * $FreeBSD: src/lib/libc/stdio/gets.c,v 1.17 2007/01/09 00:28:06 imp Exp $
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34 */
35
17ea2221 36#include "namespace.h"
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37#include <unistd.h>
38#include <stdio.h>
17ea2221 39#include "un-namespace.h"
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40#include "libc_private.h"
41#include "local.h"
42#include "priv_stdio.h"
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43
44__warn_references(gets, "warning: this program uses gets(), which is unsafe.");
45
46char *
5948ada8 47gets(char *buf)
984263bc 48{
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49 int c;
50 char *s;
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51 static int warned;
52 static char w[] =
53 "warning: this program uses gets(), which is unsafe.\n";
54
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55 FLOCKFILE(stdin);
56 ORIENT(stdin, -1);
984263bc 57 if (!warned) {
54a0004d 58 _write(STDERR_FILENO, w, sizeof(w) - 1);
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59 warned = 1;
60 }
e0f95098 61 for (s = buf; (c = __sgetc(stdin)) != '\n';)
984263bc 62 if (c == EOF)
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63 if (s == buf) {
64 FUNLOCKFILE(stdin);
984263bc 65 return (NULL);
e0f95098 66 } else
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67 break;
68 else
69 *s++ = c;
70 *s = 0;
e0f95098 71 FUNLOCKFILE(stdin);
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72 return (buf);
73}