1 /* $OpenBSD: fgetwc.c,v 1.6 2015/12/24 19:55:39 schwarze Exp $ */
2 /* $NetBSD: fgetwc.c,v 1.3 2003/03/07 07:11:36 tshiozak Exp $ */
3
4 /*-
5 * Copyright (c)2001 Citrus Project,
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 * $Citrus$
30 */
31
32 #include <errno.h>
33 #include <stdio.h>
34 #include <wchar.h>
35 #include "local.h"
36
37 wint_t
__fgetwc_unlock(FILE * fp)38 __fgetwc_unlock(FILE *fp)
39 {
40 struct wchar_io_data *wcio;
41 mbstate_t *st;
42 wchar_t wc;
43 size_t size;
44
45 _SET_ORIENTATION(fp, 1);
46 wcio = WCIO_GET(fp);
47 if (wcio == 0) {
48 errno = ENOMEM;
49 return WEOF;
50 }
51
52 /* if there're ungetwc'ed wchars, use them */
53 if (wcio->wcio_ungetwc_inbuf) {
54 wc = wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf];
55
56 return wc;
57 }
58
59 st = &wcio->wcio_mbstate_in;
60
61 do {
62 char c;
63 int ch = __sgetc(fp);
64
65 if (ch == EOF) {
66 return WEOF;
67 }
68
69 c = ch;
70 size = mbrtowc(&wc, &c, 1, st);
71 if (size == (size_t)-1) {
72 fp->_flags |= __SERR;
73 return WEOF;
74 }
75 } while (size == (size_t)-2);
76
77 return wc;
78 }
79
80 wint_t
fgetwc(FILE * fp)81 fgetwc(FILE *fp)
82 {
83 wint_t r;
84
85 FLOCKFILE(fp);
86 r = __fgetwc_unlock(fp);
87 FUNLOCKFILE(fp);
88
89 return (r);
90 }
91 DEF_STRONG(fgetwc);
92