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: stable/10/lib/libc/stdio/fgetwc.c 321074 2017-07-17 14:09:34Z kib $"); 34 35#include "namespace.h" 36#include <errno.h> 37#include <stdio.h> 38#include <stdlib.h> 39#include <wchar.h> 40#include "un-namespace.h" 41#include "libc_private.h" 42#include "local.h" 43#include "mblocal.h" 44#include "xlocale_private.h" 45 46/* 47 * MT-safe version. 48 */ 49wint_t 50fgetwc_l(FILE *fp, locale_t locale) 51{ 52 wint_t r; 53 FIX_LOCALE(locale); 54 55 FLOCKFILE_CANCELSAFE(fp); 56 ORIENT(fp, 1); 57 r = __fgetwc(fp, locale); 58 FUNLOCKFILE_CANCELSAFE(); 59 60 return (r); 61} 62 63wint_t 64fgetwc(FILE *fp) 65{ 66 return fgetwc_l(fp, __get_locale()); 67} 68 69/* 70 * Internal (non-MPSAFE) version of fgetwc(). This version takes an 71 * mbstate_t argument specifying the initial conversion state. For 72 * wide streams, this should always be fp->_mbstate. On return, *nread 73 * is set to the number of bytes read. 74 */ 75wint_t 76__fgetwc_mbs(FILE *fp, mbstate_t *mbs, int *nread, locale_t locale) 77{ 78 wchar_t wc; 79 size_t nconv; 80 struct xlocale_ctype *l = XLOCALE_CTYPE(locale); 81 82 *nread = 0; 83 if (fp->_r <= 0 && __srefill(fp)) 84 return (WEOF); 85 do { 86 nconv = l->__mbrtowc(&wc, fp->_p, fp->_r, mbs); 87 if (nconv == (size_t)-1) { 88 fp->_flags |= __SERR; 89 return (WEOF); 90 } else if (nconv == (size_t)-2) 91 continue; 92 else if (nconv == 0) { 93 fp->_p++; 94 fp->_r--; 95 (*nread)++; 96 return (L'\0'); 97 } else { 98 fp->_p += nconv; 99 fp->_r -= nconv; 100 *nread += nconv; 101 return (wc); 102 } 103 } while (__srefill(fp) == 0); 104 if (__sfeof(fp)) { 105 fp->_flags |= __SERR; 106 errno = EILSEQ; 107 } 108 return (WEOF); 109} 110