1/*	$OpenBSD: fgetws.c,v 1.8 2016/01/04 16:14:19 schwarze Exp $	*/
2/* $NetBSD: fgetws.c,v 1.1 2003/03/07 07:11:37 tshiozak Exp $ */
3
4/*-
5 * Copyright (c) 2002 Tim J. Robbins.
6 * All rights reserved.
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 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * Original version ID:
30 * FreeBSD: src/lib/libc/stdio/fgetws.c,v 1.4 2002/09/20 13:25:40 tjr Exp
31 *
32 */
33
34#include <errno.h>
35#include <stdio.h>
36#include <wchar.h>
37#include "local.h"
38
39wchar_t *
40fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)
41{
42	wchar_t *wsp;
43	wint_t wc;
44
45	FLOCKFILE(fp);
46	_SET_ORIENTATION(fp, 1);
47
48	if (n <= 0) {
49		errno = EINVAL;
50		goto error;
51	}
52
53	wsp = ws;
54	while (n-- > 1) {
55		if ((wc = __fgetwc_unlock(fp)) == WEOF &&
56		    ferror(fp) && errno == EILSEQ)
57			goto error;
58		if (wc == WEOF) {
59			if (wsp == ws) {
60				/* EOF/error, no characters read yet. */
61				goto error;
62			}
63			break;
64		}
65		*wsp++ = (wchar_t)wc;
66		if (wc == L'\n') {
67			break;
68		}
69	}
70
71	*wsp++ = L'\0';
72	FUNLOCKFILE(fp);
73
74	return (ws);
75
76error:
77	FUNLOCKFILE(fp);
78	return (NULL);
79}
80DEF_STRONG(fgetws);
81