ungetwc.c revision 103782
1101776Stjr/*- 2101776Stjr * Copyright (c) 2002 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 103782 2002-09-22 05:59:00Z tjr $"); 29101776Stjr 30101776Stjr#include "namespace.h" 31101776Stjr#include <errno.h> 32101776Stjr#include <stdio.h> 33103523Stjr#include <stdlib.h> 34101776Stjr#include <wchar.h> 35101776Stjr#include "un-namespace.h" 36101776Stjr#include "libc_private.h" 37101776Stjr#include "local.h" 38101776Stjr 39103782Stjr/* 40103782Stjr * Non-MT-safe version. 41103782Stjr */ 42101776Stjrwint_t 43103782Stjr__ungetwc(wint_t wc, FILE *fp) 44101776Stjr{ 45103523Stjr char buf[MB_LEN_MAX]; 46103523Stjr mbstate_t mbs; 47103523Stjr size_t len; 48101776Stjr 49103523Stjr if (wc == WEOF) 50103782Stjr return (WEOF); 51103523Stjr memset(&mbs, 0, sizeof(mbs)); 52103523Stjr if ((len = wcrtomb(buf, wc, &mbs)) == (size_t)-1) 53103782Stjr return (WEOF); 54103523Stjr while (len-- != 0) 55103677Stjr if (__ungetc((unsigned char)buf[len], fp) == EOF) 56103782Stjr return (WEOF); 57103523Stjr 58103523Stjr return (wc); 59103782Stjr} 60103677Stjr 61103782Stjr/* 62103782Stjr * MT-safe version. 63103782Stjr */ 64103782Stjrwint_t 65103782Stjrungetwc(wint_t wc, FILE *fp) 66103782Stjr{ 67103782Stjr wint_t r; 68103782Stjr 69103782Stjr FLOCKFILE(fp); 70103782Stjr ORIENT(fp, 1); 71103782Stjr r = __ungetwc(wc, fp); 72103677Stjr FUNLOCKFILE(fp); 73103782Stjr 74103782Stjr return (r); 75101776Stjr} 76