1 /*-
2 * Copyright (c) 2002-2004 Tim J. Robbins.
3 * All rights reserved.
4 *
5 * Copyright (c) 2011 The FreeBSD Foundation
6 * All rights reserved.
7 * Portions of this software were developed by David Chisnall
8 * under sponsorship from the FreeBSD Foundation.
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 * $FreeBSD: head/lib/libc/stdio/ungetwc.c 227753 2011-11-20 14:45:42Z theraven $
32 */
33
34
35 #include "namespace.h"
36 #include <errno.h>
37 #include <limits.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <wchar.h>
41 #include "un-namespace.h"
42 #include "libc_private.h"
43 #include "local.h"
44 #include "mblocal.h"
45 #include "xlocale_private.h"
46
47 /*
48 * Non-MT-safe version.
49 */
50 wint_t
__ungetwc(wint_t wc,FILE * fp,locale_t locale)51 __ungetwc(wint_t wc, FILE *fp, locale_t locale)
52 {
53 char buf[MB_LEN_MAX];
54 size_t len;
55 struct xlocale_ctype *l = XLOCALE_CTYPE(locale);
56 struct wchar_io_data *wcio;
57 mbstate_t *st;
58
59 ORIENT(fp,1);
60 wcio = WCIO_GET(fp);
61
62 if (wc == WEOF)
63 return (WEOF);
64 if (wcio == NULL) {
65 return (WEOF);
66 }
67 wcio->wcio_ungetwc_inbuf = 0;
68 st = &wcio->wcio_mbstate_out;
69 if ((len = l->__wcrtomb(buf, wc, st)) == (size_t)-1) {
70 fp->pub._flags |= __SERR;
71 return (WEOF);
72 }
73 while (len-- != 0)
74 if (__ungetc((unsigned char)buf[len], fp) == EOF)
75 return (WEOF);
76
77 return (wc);
78 }
79
80 /*
81 * MT-safe version.
82 */
83 wint_t
ungetwc_l(wint_t wc,FILE * fp,locale_t locale)84 ungetwc_l(wint_t wc, FILE *fp, locale_t locale)
85 {
86 wint_t r;
87 FIX_LOCALE(locale);
88
89 FLOCKFILE(fp);
90 ORIENT(fp, 1);
91 r = __ungetwc(wc, fp, locale);
92 FUNLOCKFILE(fp);
93
94 return (r);
95 }
96 wint_t
ungetwc(wint_t wc,FILE * fp)97 ungetwc(wint_t wc, FILE *fp)
98 {
99 return ungetwc_l(wc, fp, __get_locale());
100 }
101