1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2002-2004 Tim J. Robbins. 5 * All rights reserved. 6 * 7 * Copyright (c) 2011 The FreeBSD Foundation 8 * 9 * Portions of this software were developed by David Chisnall 10 * under sponsorship from the FreeBSD Foundation. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "namespace.h" 38 #include <errno.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <wchar.h> 42 #include "un-namespace.h" 43 #include "libc_private.h" 44 #include "local.h" 45 #include "mblocal.h" 46 #include "xlocale_private.h" 47 48 /* 49 * MT-safe version. 50 */ 51 wint_t 52 fgetwc_l(FILE *fp, locale_t locale) 53 { 54 wint_t r; 55 FIX_LOCALE(locale); 56 57 FLOCKFILE_CANCELSAFE(fp); 58 ORIENT(fp, 1); 59 r = __fgetwc(fp, locale); 60 FUNLOCKFILE_CANCELSAFE(); 61 62 return (r); 63 } 64 65 wint_t 66 fgetwc(FILE *fp) 67 { 68 return fgetwc_l(fp, __get_locale()); 69 } 70 71 /* 72 * Internal (non-MPSAFE) version of fgetwc(). This version takes an 73 * mbstate_t argument specifying the initial conversion state. For 74 * wide streams, this should always be fp->_mbstate. On return, *nread 75 * is set to the number of bytes read. 76 */ 77 wint_t 78 __fgetwc_mbs(FILE *fp, mbstate_t *mbs, int *nread, locale_t locale) 79 { 80 wchar_t wc; 81 size_t nconv; 82 struct xlocale_ctype *l = XLOCALE_CTYPE(locale); 83 84 *nread = 0; 85 if (fp->_r <= 0 && __srefill(fp)) 86 return (WEOF); 87 do { 88 nconv = l->__mbrtowc(&wc, fp->_p, fp->_r, mbs); 89 if (nconv == (size_t)-1) { 90 fp->_flags |= __SERR; 91 return (WEOF); 92 } else if (nconv == (size_t)-2) 93 continue; 94 else if (nconv == 0) { 95 fp->_p++; 96 fp->_r--; 97 (*nread)++; 98 return (L'\0'); 99 } else { 100 fp->_p += nconv; 101 fp->_r -= nconv; 102 *nread += nconv; 103 return (wc); 104 } 105 } while (__srefill(fp) == 0); 106 if (__sfeof(fp)) { 107 fp->_flags |= __SERR; 108 errno = EILSEQ; 109 } 110 return (WEOF); 111 } 112