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 <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 */ 49 wint_t 50 fgetwc_l(FILE *fp, locale_t locale) 51 { 52 wint_t r; 53 FIX_LOCALE(locale); 54 55 FLOCKFILE(fp); 56 ORIENT(fp, 1); 57 r = __fgetwc(fp, locale); 58 FUNLOCKFILE(fp); 59 60 return (r); 61 } 62 wint_t 63 fgetwc(FILE *fp) 64 { 65 return fgetwc_l(fp, __get_locale()); 66 } 67 68 /* 69 * Non-MT-safe version. 70 */ 71 wint_t 72 __fgetwc(FILE *fp, locale_t locale) 73 { 74 wchar_t wc; 75 size_t nconv; 76 struct xlocale_ctype *l = XLOCALE_CTYPE(locale); 77 78 if (fp->_r <= 0 && __srefill(fp)) 79 return (WEOF); 80 if (MB_CUR_MAX == 1) { 81 /* Fast path for single-byte encodings. */ 82 wc = *fp->_p++; 83 fp->_r--; 84 return (wc); 85 } 86 do { 87 nconv = l->__mbrtowc(&wc, fp->_p, fp->_r, &fp->_mbstate); 88 if (nconv == (size_t)-1) 89 break; 90 else if (nconv == (size_t)-2) 91 continue; 92 else if (nconv == 0) { 93 /* 94 * Assume that the only valid representation of 95 * the null wide character is a single null byte. 96 */ 97 fp->_p++; 98 fp->_r--; 99 return (L'\0'); 100 } else { 101 fp->_p += nconv; 102 fp->_r -= nconv; 103 return (wc); 104 } 105 } while (__srefill(fp) == 0); 106 fp->_flags |= __SERR; 107 errno = EILSEQ; 108 return (WEOF); 109 } 110