puts.c revision 1.17 
1/*	$NetBSD: puts.c,v 1.17 2018/02/04 01:13:45 mrg Exp $	*/
2
3/*-
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Chris Torek.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#if defined(LIBC_SCCS) && !defined(lint)
37#if 0
38static char sccsid[] = "@(#)puts.c	8.1 (Berkeley) 6/4/93";
39#else
40__RCSID("$NetBSD: puts.c,v 1.17 2018/02/04 01:13:45 mrg Exp $");
41#endif
42#endif /* LIBC_SCCS and not lint */
43
44#include <assert.h>
45#include <errno.h>
46#include <stdio.h>
47#include <string.h>
48#include "fvwrite.h"
49#include "reentrant.h"
50#include "local.h"
51
52/*
53 * Write the given string to stdout, appending a newline.
54 */
55int
56puts(char const *s)
57{
58	size_t c;
59	struct __suio uio;
60	struct __siov iov[2];
61	const void *vs = s;
62	int r;
63
64	/* This avoids -Werror=nonnull-compare. */
65	if (vs == NULL)
66		s = "(null)";
67
68	c = strlen(s);
69
70	iov[0].iov_base = __UNCONST(s);
71	iov[0].iov_len = c;
72	iov[1].iov_base = __UNCONST("\n");
73	iov[1].iov_len = 1;
74	uio.uio_resid = c + 1;
75	uio.uio_iov = &iov[0];
76	uio.uio_iovcnt = 2;
77	FLOCKFILE(stdout);
78	r = __sfvwrite(stdout, &uio);
79	FUNLOCKFILE(stdout);
80	return r ? EOF : '\n';
81}
82