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 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "namespace.h" 31 #include <errno.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <wchar.h> 35 #include "un-namespace.h" 36 #include "libc_private.h" 37 #include "local.h" 38 #include "mblocal.h" 39 40 /* 41 * MT-safe version. 42 */ 43 wint_t 44 fgetwc(FILE *fp) 45 { 46 wint_t r; 47 48 FLOCKFILE(fp); 49 ORIENT(fp, 1); 50 r = __fgetwc(fp); 51 FUNLOCKFILE(fp); 52 53 return (r); 54 } 55 56 /* 57 * Non-MT-safe version. 58 */ 59 wint_t 60 __fgetwc(FILE *fp) 61 { 62 wchar_t wc; 63 size_t nconv; 64 65 if (fp->_r <= 0 && __srefill(fp)) 66 return (WEOF); 67 if (MB_CUR_MAX == 1) { 68 /* Fast path for single-byte encodings. */ 69 wc = *fp->_p++; 70 fp->_r--; 71 return (wc); 72 } 73 do { 74 nconv = __mbrtowc(&wc, fp->_p, fp->_r, &fp->_mbstate); 75 if (nconv == (size_t)-1) 76 break; 77 else if (nconv == (size_t)-2) 78 continue; 79 else if (nconv == 0) { 80 /* 81 * Assume that the only valid representation of 82 * the null wide character is a single null byte. 83 */ 84 fp->_p++; 85 fp->_r--; 86 return (L'\0'); 87 } else { 88 fp->_p += nconv; 89 fp->_r -= nconv; 90 return (wc); 91 } 92 } while (__srefill(fp) == 0); 93 fp->_flags |= __SERR; 94 errno = EILSEQ; 95 return (WEOF); 96 } 97