1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2002-2004 Tim J. Robbins.
5 * All rights reserved.
6 *
7 * Copyright (c) 2011 The FreeBSD Foundation
8 *
9 * Portions of this software were developed by David Chisnall
10 * under sponsorship from the FreeBSD Foundation.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include "namespace.h"
35 #include <errno.h>
36 #include <limits.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <wchar.h>
40 #include "un-namespace.h"
41 #include "libc_private.h"
42 #include "local.h"
43 #include "mblocal.h"
44 #include "xlocale_private.h"
45
46 /*
47 * Non-MT-safe version.
48 */
49 wint_t
__ungetwc(wint_t wc,FILE * fp,locale_t locale)50 __ungetwc(wint_t wc, FILE *fp, locale_t locale)
51 {
52 char buf[MB_LEN_MAX];
53 size_t len;
54 struct xlocale_ctype *l = XLOCALE_CTYPE(locale);
55
56 if (wc == WEOF)
57 return (WEOF);
58 if ((len = l->__wcrtomb(buf, wc, &fp->_mbstate)) == (size_t)-1) {
59 fp->_flags |= __SERR;
60 return (WEOF);
61 }
62 while (len-- != 0)
63 if (__ungetc((unsigned char)buf[len], fp) == EOF)
64 return (WEOF);
65
66 return (wc);
67 }
68
69 /*
70 * MT-safe version.
71 */
72 wint_t
ungetwc_l(wint_t wc,FILE * fp,locale_t locale)73 ungetwc_l(wint_t wc, FILE *fp, locale_t locale)
74 {
75 wint_t r;
76 FIX_LOCALE(locale);
77
78 FLOCKFILE_CANCELSAFE(fp);
79 ORIENT(fp, 1);
80 r = __ungetwc(wc, fp, locale);
81 FUNLOCKFILE_CANCELSAFE();
82
83 return (r);
84 }
85 wint_t
ungetwc(wint_t wc,FILE * fp)86 ungetwc(wint_t wc, FILE *fp)
87 {
88 return ungetwc_l(wc, fp, __get_locale());
89 }
90