1 /* $OpenBSD: fgetwc.c,v 1.4 2009/11/09 00:18:27 kurt Exp $ */ 2 /* $NetBSD: fgetwc.c,v 1.3 2003/03/07 07:11:36 tshiozak Exp $ */ 3 4 /*- 5 * Copyright (c)2001 Citrus Project, 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $Citrus$ 30 */ 31 32 #include <errno.h> 33 #include <stdio.h> 34 #include <wchar.h> 35 #include "local.h" 36 37 wint_t 38 __fgetwc_unlock(FILE *fp) 39 { 40 struct wchar_io_data *wcio; 41 mbstate_t *st; 42 wchar_t wc; 43 size_t size; 44 45 _SET_ORIENTATION(fp, 1); 46 wcio = WCIO_GET(fp); 47 if (wcio == 0) { 48 errno = ENOMEM; 49 return WEOF; 50 } 51 52 /* if there're ungetwc'ed wchars, use them */ 53 if (wcio->wcio_ungetwc_inbuf) { 54 wc = wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf]; 55 56 return wc; 57 } 58 59 st = &wcio->wcio_mbstate_in; 60 61 do { 62 char c; 63 int ch = __sgetc(fp); 64 65 if (ch == EOF) { 66 return WEOF; 67 } 68 69 c = ch; 70 size = mbrtowc(&wc, &c, 1, st); 71 if (size == (size_t)-1) { 72 errno = EILSEQ; 73 return WEOF; 74 } 75 } while (size == (size_t)-2); 76 77 return wc; 78 } 79 80 wint_t 81 fgetwc(FILE *fp) 82 { 83 wint_t r; 84 85 FLOCKFILE(fp); 86 r = __fgetwc_unlock(fp); 87 FUNLOCKFILE(fp); 88 89 return (r); 90 } 91
