1 /* $NetBSD: fgetwc.c,v 1.1 2001/12/07 11:47:41 yamt Exp $ */ 2 3 /*- 4 * Copyright (c)2001 Citrus Project, 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $Citrus$ 29 */ 30 31 #include <assert.h> 32 #include <errno.h> 33 #include <stdio.h> 34 #include <wchar.h> 35 #include "local.h" 36 #include "reentrant.h" 37 38 wint_t 39 fgetwc(FILE *fp) 40 { 41 struct wchar_io_data *wcio; 42 mbstate_t *st; 43 wchar_t wc; 44 size_t size; 45 46 _DIAGASSERT(fp != NULL); 47 48 FLOCKFILE(fp); 49 _SET_ORIENTATION(fp, 1); 50 wcio = WCIO_GET(fp); 51 if (wcio == 0) { 52 FUNLOCKFILE(fp); 53 errno = ENOMEM; 54 return WEOF; 55 } 56 57 /* if there're ungetwc'ed wchars, use them */ 58 if (wcio->wcio_ungetwc_inbuf) { 59 wc = wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf]; 60 FUNLOCKFILE(fp); 61 62 return wc; 63 } 64 65 st = &wcio->wcio_mbstate_in; 66 67 do { 68 char c; 69 int ch = __sgetc(fp); 70 71 if (ch == EOF) { 72 FUNLOCKFILE(fp); 73 return WEOF; 74 } 75 76 c = ch; 77 size = mbrtowc(&wc, &c, 1, st); 78 if (size == (size_t)-1) { 79 FUNLOCKFILE(fp); 80 errno = EILSEQ; 81 return WEOF; 82 } 83 } while (size == (size_t)-2); 84 FUNLOCKFILE(fp); 85 86 _DIAGASSERT(size == 1); 87 88 return wc; 89 } 90