1 /*- 2 * Copyright (c) 2002-2004 Tim J. Robbins. 3 * All rights reserved. 4 * 5 * Copyright (c) 2011 The FreeBSD Foundation 6 * All rights reserved. 7 * Portions of this software were developed by David Chisnall 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "namespace.h" 36 #include <errno.h> 37 #include <limits.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <wchar.h> 41 #include "un-namespace.h" 42 #include "libc_private.h" 43 #include "local.h" 44 #include "mblocal.h" 45 #include "xlocale_private.h" 46 47 /* 48 * Non-MT-safe version. 49 */ 50 wint_t 51 __ungetwc(wint_t wc, FILE *fp, locale_t locale) 52 { 53 char buf[MB_LEN_MAX]; 54 size_t len; 55 struct xlocale_ctype *l = XLOCALE_CTYPE(locale); 56 57 if (wc == WEOF) 58 return (WEOF); 59 if ((len = l->__wcrtomb(buf, wc, &fp->_mbstate)) == (size_t)-1) { 60 fp->_flags |= __SERR; 61 return (WEOF); 62 } 63 while (len-- != 0) 64 if (__ungetc((unsigned char)buf[len], fp) == EOF) 65 return (WEOF); 66 67 return (wc); 68 } 69 70 /* 71 * MT-safe version. 72 */ 73 wint_t 74 ungetwc_l(wint_t wc, FILE *fp, locale_t locale) 75 { 76 wint_t r; 77 FIX_LOCALE(locale); 78 79 FLOCKFILE_CANCELSAFE(fp); 80 ORIENT(fp, 1); 81 r = __ungetwc(wc, fp, locale); 82 FUNLOCKFILE_CANCELSAFE(); 83 84 return (r); 85 } 86 wint_t 87 ungetwc(wint_t wc, FILE *fp) 88 { 89 return ungetwc_l(wc, fp, __get_locale()); 90 } 91