| Elliott Hughes | b364683 | 2017-07-11 12:34:19 -0700 | [diff] [blame] | 1 | /* $OpenBSD: ungetwc.c,v 1.6 2015/08/31 02:53:57 guenther Exp $ */ |
| Elliott Hughes | 01ae00f | 2014-04-29 16:28:56 -0700 | [diff] [blame] | 2 | /* $NetBSD: ungetwc.c,v 1.2 2003/01/18 11:29:59 thorpej Exp $ */ |
| 3 | |
| 4 | /*- |
| 5 | * Copyright (c)2001 Citrus Project, |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | * |
| 29 | * $Citrus$ |
| 30 | */ |
| 31 | |
| 32 | #include <errno.h> |
| 33 | #include <stdio.h> |
| 34 | #include <wchar.h> |
| 35 | #include "local.h" |
| 36 | |
| 37 | wint_t |
| 38 | __ungetwc(wint_t wc, FILE *fp) |
| 39 | { |
| 40 | struct wchar_io_data *wcio; |
| 41 | |
| 42 | if (wc == WEOF) |
| 43 | return WEOF; |
| 44 | |
| 45 | _SET_ORIENTATION(fp, 1); |
| 46 | /* |
| 47 | * XXX since we have no way to transform a wchar string to |
| 48 | * a char string in reverse order, we can't use ungetc. |
| 49 | */ |
| 50 | /* XXX should we flush ungetc buffer? */ |
| 51 | |
| 52 | wcio = WCIO_GET(fp); |
| 53 | if (wcio == 0) { |
| 54 | errno = ENOMEM; /* XXX */ |
| 55 | return WEOF; |
| 56 | } |
| 57 | |
| 58 | if (wcio->wcio_ungetwc_inbuf >= WCIO_UNGETWC_BUFSIZE) { |
| 59 | return WEOF; |
| 60 | } |
| 61 | |
| 62 | wcio->wcio_ungetwc_buf[wcio->wcio_ungetwc_inbuf++] = wc; |
| 63 | __sclearerr(fp); |
| 64 | |
| 65 | return wc; |
| 66 | } |
| 67 | |
| 68 | wint_t |
| 69 | ungetwc(wint_t wc, FILE *fp) |
| 70 | { |
| 71 | wint_t r; |
| 72 | |
| 73 | FLOCKFILE(fp); |
| 74 | r = __ungetwc(wc, fp); |
| 75 | FUNLOCKFILE(fp); |
| 76 | return (r); |
| 77 | } |
| Elliott Hughes | b364683 | 2017-07-11 12:34:19 -0700 | [diff] [blame] | 78 | DEF_STRONG(ungetwc); |