1 /* $MirOS: src/lib/libc/stdio/fgetwc.c,v 1.7 2008/08/01 23:50:01 tg Exp $ */
2 /* $OpenBSD: fgetwc.c,v 1.1 2005/06/17 20:40:32 espie Exp $ */
3 /* $NetBSD: fgetwc.c,v 1.3 2003/03/07 07:11:36 tshiozak Exp $ */
4
5 /*-
6 * Copyright (c) 2007, 2008 Thorsten Glaser
7 * Copyright (c)2001 Citrus Project,
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $Citrus$
32 */
33
34 #include <errno.h>
35 #include <stdbool.h>
36 #include <stdio.h>
37 #include <wchar.h>
38 #include "local.h"
39
40 __RCSID("$MirOS: src/lib/libc/stdio/fgetwc.c,v 1.7 2008/08/01 23:50:01 tg Exp $");
41
42 wint_t __fgetwc_unlock(FILE *);
43
44 wint_t
__fgetwc_unlock(FILE * fp)45 __fgetwc_unlock(FILE *fp)
46 {
47 struct wchar_io_data *wcio;
48 mbstate_t *st;
49 wchar_t wc;
50 size_t size;
51
52 _SET_ORIENTATION(fp, 1);
53 wcio = WCIO_GET(fp);
54 if (wcio == 0) {
55 errno = ENOMEM;
56 return WEOF;
57 }
58
59 /* if there're ungetwc'ed wchars, use them */
60 if (wcio->wcio_ungetwc_inbuf) {
61 wc = wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf];
62
63 return wc;
64 }
65
66 st = &wcio->wcio_mbstate_in;
67
68 do {
69 char c;
70 int ch = __sgetc(fp);
71
72 if (ch == EOF) {
73 if (optu8to16(&wc, NULL, 0, st) == 0)
74 return (wc);
75 return WEOF;
76 }
77
78 c = ch;
79 size = optu8to16(&wc, &c, 1, st);
80 if (size == 0) {
81 ungetc(ch, fp);
82 return (wc);
83 }
84 } while (size == (size_t)-2);
85
86 return wc;
87 }
88
89 wint_t
fgetwc(FILE * fp)90 fgetwc(FILE *fp)
91 {
92 wint_t r;
93
94 flockfile(fp);
95 r = __fgetwc_unlock(fp);
96 funlockfile(fp);
97
98 return (r);
99 }
100