| /* $OpenBSD: ungetwc.c,v 1.5 2011/10/16 13:20:51 stsp Exp $ */ |
| /* $NetBSD: ungetwc.c,v 1.2 2003/01/18 11:29:59 thorpej Exp $ */ |
| |
| /*- |
| * Copyright (c)2001 Citrus Project, |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * $Citrus$ |
| */ |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <wchar.h> |
| #include "local.h" |
| |
| wint_t |
| __ungetwc(wint_t wc, FILE *fp) |
| { |
| struct wchar_io_data *wcio; |
| |
| if (wc == WEOF) |
| return WEOF; |
| |
| _SET_ORIENTATION(fp, 1); |
| /* |
| * XXX since we have no way to transform a wchar string to |
| * a char string in reverse order, we can't use ungetc. |
| */ |
| /* XXX should we flush ungetc buffer? */ |
| |
| wcio = WCIO_GET(fp); |
| if (wcio == 0) { |
| errno = ENOMEM; /* XXX */ |
| return WEOF; |
| } |
| |
| if (wcio->wcio_ungetwc_inbuf >= WCIO_UNGETWC_BUFSIZE) { |
| return WEOF; |
| } |
| |
| wcio->wcio_ungetwc_buf[wcio->wcio_ungetwc_inbuf++] = wc; |
| __sclearerr(fp); |
| |
| return wc; |
| } |
| |
| wint_t |
| ungetwc(wint_t wc, FILE *fp) |
| { |
| wint_t r; |
| |
| FLOCKFILE(fp); |
| r = __ungetwc(wc, fp); |
| FUNLOCKFILE(fp); |
| return (r); |
| } |