1/* $NetBSD: fgetws.c,v 1.2 2006/07/03 17:06:36 tnozaki Exp $ */
2
3/*-
4 * Copyright (c) 2002 Tim J. Robbins.
5 * 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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * Original version ID:
29 * FreeBSD: src/lib/libc/stdio/fgetws.c,v 1.4 2002/09/20 13:25:40 tjr Exp
30 *
31 */
32
33#include <sys/cdefs.h>
34#if defined(LIB_SCCS) && !defined(lint)
35__RCSID("$NetBSD: fgetws.c,v 1.2 2006/07/03 17:06:36 tnozaki Exp $");
36#endif
37
38#include <assert.h>
39#include <errno.h>
40#include <stdio.h>
41#include <wchar.h>
42#include "reentrant.h"
43#include "local.h"
44
45wchar_t *
46fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)
47{
48	wchar_t *wsp;
49	wint_t wc;
50
51	_DIAGASSERT(fp != NULL);
52	_DIAGASSERT(ws != NULL);
53
54	FLOCKFILE(fp);
55	_SET_ORIENTATION(fp, 1);
56
57	if (n <= 0) {
58		errno = EINVAL;
59		goto error;
60	}
61
62	wsp = ws;
63	while (n-- > 1) {
64		wc = __fgetwc_unlock(fp);
65		if (__sferror(fp) != 0)
66			goto error;
67		if (__sfeof(fp) != 0) {
68			if (wsp == ws) {
69				/* EOF/error, no characters read yet. */
70				goto error;
71			}
72			break;
73		}
74		*wsp++ = (wchar_t)wc;
75		if (wc == L'\n') {
76			break;
77		}
78	}
79
80	*wsp++ = L'\0';
81	FUNLOCKFILE(fp);
82
83	return ws;
84
85error:
86	FUNLOCKFILE(fp);
87	return NULL;
88}
89