1 /* 2 * Copyright (c) 2002-2004 Tim J. Robbins. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 /* 27 * Copyright 2010 Nexenta Systems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 #include "lint.h" 32 #include "mse_int.h" 33 #include "file64.h" 34 #include "mtlib.h" 35 #include <errno.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <wchar.h> 39 #include "mblocal.h" 40 #include "stdiom.h" 41 42 /* 43 * Non-MT-safe version. 44 */ 45 wint_t 46 _fgetwc_unlocked(FILE *fp) 47 { 48 wchar_t wc; 49 size_t nconv; 50 int c; 51 mbstate_t *statep; 52 53 if ((c = GETC(fp)) == EOF) 54 return (WEOF); 55 56 if (MB_CUR_MAX == 1) { 57 /* Fast path for single-byte encodings. */ 58 return ((wint_t)c); 59 } 60 if ((statep = _getmbstate(fp)) == NULL) { 61 fp->_flag = _IOERR; 62 errno = EBADF; 63 return (WEOF); 64 } 65 do { 66 char x = (char)c; 67 nconv = __mbrtowc(&wc, &x, 1, statep); 68 if (nconv == (size_t)-1) { 69 break; 70 } else if (nconv == (size_t)-2) { 71 /* Incompletely decoded, consume another char */ 72 continue; 73 } else if (nconv == 0) { 74 /* 75 * Assume that the only valid representation of 76 * the null wide character is a single null byte. 77 */ 78 return (L'\0'); 79 } else { 80 return (wc); 81 } 82 } while ((c = GETC(fp)) != EOF); 83 84 /* 85 * If we got here it means we got truncated in a character, or 86 * the character did not decode properly. Note that in the case 87 * of a botched decoding, we don't UNGETC the bad bytes. Should 88 * we? 89 */ 90 fp->_flag |= _IOERR; 91 errno = EILSEQ; 92 return (WEOF); 93 } 94 95 96 /* 97 * MT safe version 98 */ 99 wint_t 100 fgetwc(FILE *fp) 101 { 102 wint_t r; 103 rmutex_t *l; 104 105 FLOCKFILE(l, fp); 106 r = _fgetwc_unlocked(fp); 107 FUNLOCKFILE(l); 108 109 return (r); 110 } 111 112 #undef getwc 113 wint_t 114 getwc(FILE *fp) 115 { 116 return (getwc(fp)); 117 } 118 119 /* 120 * XPG5 version. 121 */ 122 wint_t 123 __fgetwc_xpg5(FILE *fp) 124 { 125 wint_t r; 126 rmutex_t *l; 127 128 FLOCKFILE(l, fp); 129 if (GET_NO_MODE(fp)) 130 _setorientation(fp, _WC_MODE); 131 r = _fgetwc_unlocked(fp); 132 FUNLOCKFILE(l); 133 134 return (r); 135 } 136 137 #undef __getwc_xpg5 138 wint_t 139 __getwc_xpg5(FILE *fp) 140 { 141 return (__fgetwc_xpg5(fp)); 142 } 143