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 39 /* 40 * MT-safe version. 41 */ 42 wint_t 43 fgetwc(FILE *fp) 44 { 45 wint_t r; 46 47 FLOCKFILE(fp); 48 ORIENT(fp, 1); 49 r = __fgetwc(fp); 50 FUNLOCKFILE(fp); 51 52 return (r); 53 } 54 55 /* 56 * Non-MT-safe version. 57 */ 58 wint_t 59 __fgetwc(FILE *fp) 60 { 61 wchar_t wc; 62 size_t nconv; 63 64 if (fp->_r <= 0 && __srefill(fp)) 65 return (WEOF); 66 if (MB_CUR_MAX == 1) { 67 /* Fast path for single-byte encodings. */ 68 wc = *fp->_p++; 69 fp->_r--; 70 return (wc); 71 } 72 do { 73 nconv = mbrtowc(&wc, fp->_p, fp->_r, &fp->_extra->mbstate); 74 if (nconv == (size_t)-1) 75 break; 76 else if (nconv == (size_t)-2) 77 continue; 78 else if (nconv == 0) { 79 /* 80 * Assume that the only valid representation of 81 * the null wide character is a single null byte. 82 */ 83 fp->_p++; 84 fp->_r--; 85 return (L'\0'); 86 } else { 87 fp->_p += nconv; 88 fp->_r -= nconv; 89 return (wc); 90 } 91 } while (__srefill(fp) == 0); 92 fp->_flags |= __SERR; 93 errno = EILSEQ; 94 return (WEOF); 95 } 96