fgetwc.c revision 129583
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: head/lib/libc/stdio/fgetwc.c 129583 2004-05-22 15:19:41Z tjr $"); 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 39static __inline wint_t __fgetwc_nbf(FILE *); 40 41/* 42 * Non-MT-safe version. 43 */ 44wint_t 45__fgetwc(FILE *fp) 46{ 47 wint_t wc; 48 49 if (MB_CUR_MAX == 1) { 50 /* 51 * Assume we're using a single-byte locale. A safer test 52 * might be to check _CurrentRuneLocale->encoding. 53 */ 54 wc = (wint_t)__sgetc(fp); 55 } else 56 wc = __fgetwc_nbf(fp); 57 58 return (wc); 59} 60 61/* 62 * MT-safe version. 63 */ 64wint_t 65fgetwc(FILE *fp) 66{ 67 wint_t r; 68 69 FLOCKFILE(fp); 70 ORIENT(fp, 1); 71 r = __fgetwc(fp); 72 FUNLOCKFILE(fp); 73 74 return (r); 75} 76 77static __inline wint_t 78__fgetwc_nbf(FILE *fp) 79{ 80 size_t n, nconv; 81 int c; 82 char cc; 83 wchar_t wc; 84 85 n = 0; 86 for (;;) { 87 if ((c = __sgetc(fp)) == EOF) { 88 if (n == 0) 89 return (WEOF); 90 break; 91 } 92 n++; 93 cc = (char)c; 94 nconv = mbrtowc(&wc, &cc, 1, &fp->_extra->mbstate); 95 if (nconv == (size_t)-2) 96 continue; 97 else if (nconv == (size_t)-1) 98 break; 99 else if (nconv == 0) 100 return (L'\0'); 101 else 102 return (wc); 103 } 104 fp->_flags |= __SERR; 105 errno = EILSEQ; 106 return (WEOF); 107} 108