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 63 wint_t 64 fgetwc(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 */ 75 wint_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 if (fp->_r <= 0 && __srefill(fp)) { 83 *nread = 0; 84 return (WEOF); 85 } 86 if (MB_CUR_MAX == 1) { 87 /* Fast path for single-byte encodings. */ 88 wc = *fp->_p++; 89 fp->_r--; 90 *nread = 1; 91 return (wc); 92 } 93 *nread = 0; 94 do { 95 nconv = l->__mbrtowc(&wc, fp->_p, fp->_r, mbs); 96 if (nconv == (size_t)-1) 97 break; 98 else if (nconv == (size_t)-2) 99 continue; 100 else if (nconv == 0) { 101 fp->_p++; 102 fp->_r--; 103 (*nread)++; 104 return (L'\0'); 105 } else { 106 fp->_p += nconv; 107 fp->_r -= nconv; 108 *nread += nconv; 109 return (wc); 110 } 111 } while (__srefill(fp) == 0); 112 fp->_flags |= __SERR; 113 errno = EILSEQ; 114 return (WEOF); 115 } 116