ungetwc.c revision 149313
1101776Stjr/*- 2129583Stjr * Copyright (c) 2002-2004 Tim J. Robbins. 3101776Stjr * All rights reserved. 4101776Stjr * 5101776Stjr * Redistribution and use in source and binary forms, with or without 6101776Stjr * modification, are permitted provided that the following conditions 7101776Stjr * are met: 8101776Stjr * 1. Redistributions of source code must retain the above copyright 9101776Stjr * notice, this list of conditions and the following disclaimer. 10101776Stjr * 2. Redistributions in binary form must reproduce the above copyright 11101776Stjr * notice, this list of conditions and the following disclaimer in the 12101776Stjr * documentation and/or other materials provided with the distribution. 13101776Stjr * 14101776Stjr * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15101776Stjr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16101776Stjr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17101776Stjr * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18101776Stjr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19101776Stjr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20101776Stjr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21101776Stjr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22101776Stjr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23101776Stjr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24101776Stjr * SUCH DAMAGE. 25101776Stjr */ 26101776Stjr 27101776Stjr#include <sys/cdefs.h> 28101776Stjr__FBSDID("$FreeBSD: head/lib/libc/stdio/ungetwc.c 149313 2005-08-20 07:59:13Z stefanf $"); 29101776Stjr 30101776Stjr#include "namespace.h" 31101776Stjr#include <errno.h> 32149313Sstefanf#include <limits.h> 33101776Stjr#include <stdio.h> 34103523Stjr#include <stdlib.h> 35101776Stjr#include <wchar.h> 36101776Stjr#include "un-namespace.h" 37101776Stjr#include "libc_private.h" 38101776Stjr#include "local.h" 39132442Stjr#include "mblocal.h" 40101776Stjr 41103782Stjr/* 42103782Stjr * Non-MT-safe version. 43103782Stjr */ 44101776Stjrwint_t 45103782Stjr__ungetwc(wint_t wc, FILE *fp) 46101776Stjr{ 47103523Stjr char buf[MB_LEN_MAX]; 48103523Stjr size_t len; 49101776Stjr 50103523Stjr if (wc == WEOF) 51103782Stjr return (WEOF); 52132442Stjr if ((len = __wcrtomb(buf, wc, &fp->_extra->mbstate)) == (size_t)-1) { 53105234Stjr fp->_flags |= __SERR; 54103782Stjr return (WEOF); 55105234Stjr } 56103523Stjr while (len-- != 0) 57103677Stjr if (__ungetc((unsigned char)buf[len], fp) == EOF) 58103782Stjr return (WEOF); 59103523Stjr 60103523Stjr return (wc); 61103782Stjr} 62103677Stjr 63103782Stjr/* 64103782Stjr * MT-safe version. 65103782Stjr */ 66103782Stjrwint_t 67103782Stjrungetwc(wint_t wc, FILE *fp) 68103782Stjr{ 69103782Stjr wint_t r; 70103782Stjr 71103782Stjr FLOCKFILE(fp); 72103782Stjr ORIENT(fp, 1); 73103782Stjr r = __ungetwc(wc, fp); 74103677Stjr FUNLOCKFILE(fp); 75103782Stjr 76103782Stjr return (r); 77101776Stjr} 78