1/*
2 * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
3 * Copyright (c) 2002-2004 Tim J. Robbins.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include "lint.h"
29#include "mse_int.h"
30#include "file64.h"
31#include <errno.h>
32#include <stdio.h>
33#include <string.h>
34#include <wchar.h>
35#include "mblocal.h"
36#include "mse.h"
37#include "stdiom.h"
38#include "libc.h"
39
40/*
41 * FreeBSD implementation here included a full version that tried to be more
42 * efficient with memory strings.  However, for simplicity's sake, we are
43 * going to just use fgetwc().  We also do the stream orientation thing for
44 * XPG5 if we need to.
45 */
46
47wchar_t *
48_fgetws_impl(wchar_t *_RESTRICT_KYWD ws, int n, FILE *_RESTRICT_KYWD fp,
49    int orient)
50{
51	wint_t wc;
52	wchar_t *wsp;
53	rmutex_t *lk;
54
55	FLOCKFILE(lk, fp);
56	if (orient && GET_NO_MODE(fp))
57		_setorientation(fp, _WC_MODE);
58
59	if (n <= 0) {
60		errno = EINVAL;
61		FUNLOCKFILE(lk);
62		return (NULL);
63	}
64
65	wsp = ws;
66	while (--n) {
67		wc = _fgetwc_unlocked(fp);
68		if (wc == EOF) {
69			/*
70			 * This can happen because of an EOF on
71			 * the stream, or because of a decoding error.
72			 * Its up to the caller to check errno.
73			 */
74			if (wsp == ws) {
75				/* EOF with no data read */
76				FUNLOCKFILE(lk);
77				return (NULL);
78			}
79			break;
80		}
81		*wsp++ = wc;
82
83		if (wc == L'\n')
84			break;
85	}
86	*wsp = 0;
87	FUNLOCKFILE(lk);
88	return (ws);
89}
90
91wchar_t *
92fgetws(wchar_t *_RESTRICT_KYWD ws, int n, FILE *_RESTRICT_KYWD fp)
93{
94	return (_fgetws_impl(ws, n, fp, 0));
95}
96
97wchar_t *
98__fgetws_xpg5(wchar_t *ws, int n, FILE *fp)
99{
100	return (_fgetws_impl(ws, n, fp, 1));
101}
102
103wchar_t *
104getws(wchar_t *ws)
105{
106	wint_t wc;
107	wchar_t *wsp;
108	rmutex_t *lk;
109
110	FLOCKFILE(lk, stdin);
111
112	wsp = ws;
113	for (;;) {
114		wc = _fgetwc_unlocked(stdin);
115		if (wc == EOF) {
116			/*
117			 * This can happen because of an EOF on
118			 * the stream, or because of a decoding error.
119			 * Its up to the caller to check errno.
120			 */
121			if (wsp == ws) {
122				/* EOF with no data read */
123				FUNLOCKFILE(lk);
124				return (NULL);
125			}
126			break;
127		}
128		*wsp++ = wc;
129
130		if (wc == L'\n')
131			break;
132	}
133	*wsp = 0;
134	FUNLOCKFILE(lk);
135	return (ws);
136}
137