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
39 wchar_t *
fgetws(wchar_t * __restrict ws,int n,FILE * __restrict fp)40 fgetws(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
76 error:
77 FUNLOCKFILE(fp);
78 return (NULL);
79 }
80 DEF_STRONG(fgetws);
81