1 /*-
2 * Copyright (c)2001 Citrus Project,
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $Citrus$
27
28 NetBSD: ungetwc.c,v 1.3 2005/06/12 05:21:27 lukem Exp
29 */
30 #include <LibConfig.h>
31 #include <sys/EfiCdefs.h>
32
33 #include <assert.h>
34 #include <errno.h>
35 #include <stdio.h>
36 #include <wchar.h>
37 #include "reentrant.h"
38 #include "local.h"
39
40 wint_t
ungetwc(wint_t wc,FILE * fp)41 ungetwc(wint_t wc, FILE *fp)
42 {
43 struct wchar_io_data *wcio;
44
45 _DIAGASSERT(fp);
46
47 if (wc == WEOF)
48 return WEOF;
49
50 FLOCKFILE(fp);
51 _SET_ORIENTATION(fp, 1);
52 /*
53 * XXX since we have no way to transform a wchar string to
54 * a char string in reverse order, we can't use ungetc.
55 */
56 /* XXX should we flush ungetc buffer? */
57
58 wcio = WCIO_GET(fp);
59 if (wcio == 0) {
60 FUNLOCKFILE(fp);
61 errno = ENOMEM; /* XXX */
62 return WEOF;
63 }
64
65 if (wcio->wcio_ungetwc_inbuf >= WCIO_UNGETWC_BUFSIZE) {
66 FUNLOCKFILE(fp);
67 return WEOF;
68 }
69
70 wcio->wcio_ungetwc_buf[wcio->wcio_ungetwc_inbuf++] = (wchar_t)wc;
71 __sclearerr(fp);
72 FUNLOCKFILE(fp);
73
74 return wc;
75 }
76