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