ungetwc.c revision 1.1.2.2
1 1.1.2.2 nathanw /* $NetBSD: ungetwc.c,v 1.1.2.2 2002/01/28 20:51:11 nathanw Exp $ */ 2 1.1.2.2 nathanw 3 1.1.2.2 nathanw /*- 4 1.1.2.2 nathanw * Copyright (c)2001 Citrus Project, 5 1.1.2.2 nathanw * All rights reserved. 6 1.1.2.2 nathanw * 7 1.1.2.2 nathanw * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 nathanw * modification, are permitted provided that the following conditions 9 1.1.2.2 nathanw * are met: 10 1.1.2.2 nathanw * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 nathanw * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 nathanw * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 nathanw * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 nathanw * documentation and/or other materials provided with the distribution. 15 1.1.2.2 nathanw * 16 1.1.2.2 nathanw * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 1.1.2.2 nathanw * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 1.1.2.2 nathanw * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 1.1.2.2 nathanw * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 1.1.2.2 nathanw * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 1.1.2.2 nathanw * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 1.1.2.2 nathanw * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 1.1.2.2 nathanw * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 1.1.2.2 nathanw * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.2.2 nathanw * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.2.2 nathanw * SUCH DAMAGE. 27 1.1.2.2 nathanw * 28 1.1.2.2 nathanw * $Citrus$ 29 1.1.2.2 nathanw */ 30 1.1.2.2 nathanw 31 1.1.2.2 nathanw #include <assert.h> 32 1.1.2.2 nathanw #include <errno.h> 33 1.1.2.2 nathanw #include <stdio.h> 34 1.1.2.2 nathanw #include <wchar.h> 35 1.1.2.2 nathanw #include "local.h" 36 1.1.2.2 nathanw #include "reentrant.h" 37 1.1.2.2 nathanw 38 1.1.2.2 nathanw wint_t 39 1.1.2.2 nathanw ungetwc(wint_t wc, FILE *fp) 40 1.1.2.2 nathanw { 41 1.1.2.2 nathanw struct wchar_io_data *wcio; 42 1.1.2.2 nathanw 43 1.1.2.2 nathanw _DIAGASSERT(fp); 44 1.1.2.2 nathanw 45 1.1.2.2 nathanw if (wc == WEOF) 46 1.1.2.2 nathanw return WEOF; 47 1.1.2.2 nathanw 48 1.1.2.2 nathanw FLOCKFILE(fp); 49 1.1.2.2 nathanw _SET_ORIENTATION(fp, 1); 50 1.1.2.2 nathanw /* 51 1.1.2.2 nathanw * XXX since we have no way to transform a wchar string to 52 1.1.2.2 nathanw * a char string in reverse order, we can't use ungetc. 53 1.1.2.2 nathanw */ 54 1.1.2.2 nathanw /* XXX should we flush ungetc buffer? */ 55 1.1.2.2 nathanw 56 1.1.2.2 nathanw wcio = WCIO_GET(fp); 57 1.1.2.2 nathanw if (wcio == 0) { 58 1.1.2.2 nathanw FUNLOCKFILE(fp); 59 1.1.2.2 nathanw errno = ENOMEM; /* XXX */ 60 1.1.2.2 nathanw return WEOF; 61 1.1.2.2 nathanw } 62 1.1.2.2 nathanw 63 1.1.2.2 nathanw if (wcio->wcio_ungetwc_inbuf >= WCIO_UNGETWC_BUFSIZE) { 64 1.1.2.2 nathanw FUNLOCKFILE(fp); 65 1.1.2.2 nathanw return WEOF; 66 1.1.2.2 nathanw } 67 1.1.2.2 nathanw 68 1.1.2.2 nathanw wcio->wcio_ungetwc_buf[wcio->wcio_ungetwc_inbuf++] = wc; 69 1.1.2.2 nathanw __sclearerr(fp); 70 1.1.2.2 nathanw FUNLOCKFILE(fp); 71 1.1.2.2 nathanw 72 1.1.2.2 nathanw return wc; 73 1.1.2.2 nathanw } 74
Indexes created Tue Sep 23 14:10:03 GMT 2025