ungetwc.c revision 178287
1/*- 2 * Copyright (c) 2002-2004 Tim J. Robbins. 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 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/lib/libc/stdio/ungetwc.c 178287 2008-04-17 22:17:54Z jhb $"); 29 30#include "namespace.h" 31#include <errno.h> 32#include <limits.h> 33#include <stdio.h> 34#include <stdlib.h> 35#include <wchar.h> 36#include "un-namespace.h" 37#include "libc_private.h" 38#include "local.h" 39#include "mblocal.h" 40 41/* 42 * Non-MT-safe version. 43 */ 44wint_t 45__ungetwc(wint_t wc, FILE *fp) 46{ 47 char buf[MB_LEN_MAX]; 48 size_t len; 49 50 if (wc == WEOF) 51 return (WEOF); 52 if ((len = __wcrtomb(buf, wc, &fp->_mbstate)) == (size_t)-1) { 53 fp->_flags |= __SERR; 54 return (WEOF); 55 } 56 while (len-- != 0) 57 if (__ungetc((unsigned char)buf[len], fp) == EOF) 58 return (WEOF); 59 60 return (wc); 61} 62 63/* 64 * MT-safe version. 65 */ 66wint_t 67ungetwc(wint_t wc, FILE *fp) 68{ 69 wint_t r; 70 71 FLOCKFILE(fp); 72 ORIENT(fp, 1); 73 r = __ungetwc(wc, fp); 74 FUNLOCKFILE(fp); 75 76 return (r); 77} 78