1 /*- 2 * Copyright (c) 2002 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 static __inline wint_t __fgetwc_nbf(FILE *); 40 41 /* 42 * Non-MT-safe version. 43 */ 44 wint_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 */ 64 wint_t 65 fgetwc(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 77 static __inline wint_t 78 __fgetwc_nbf(FILE *fp) 79 { 80 char buf[MB_LEN_MAX]; 81 mbstate_t mbs; 82 size_t n, nconv; 83 int c; 84 wchar_t wc; 85 86 n = 0; 87 while (n < MB_CUR_MAX) { 88 if ((c = __sgetc(fp)) == EOF) { 89 if (n == 0) 90 return (WEOF); 91 break; 92 } 93 buf[n++] = (char)c; 94 memset(&mbs, 0, sizeof(mbs)); 95 nconv = mbrtowc(&wc, buf, n, &mbs); 96 if (nconv == n) 97 return (wc); 98 else if (nconv == 0) 99 return (L'\0'); 100 else if (nconv == (size_t)-1) 101 break; 102 } 103 104 while (n-- != 0) 105 __ungetc((unsigned char)buf[n], fp); 106 errno = EILSEQ; 107 fp->_flags |= __SERR; 108 return (WEOF); 109 } 110