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 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
