1 /* $NetBSD: fgetwc.c,v 1.4 2005/06/12 05:21:27 lukem 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 <sys/cdefs.h> 32 #if defined(LIBC_SCCS) && !defined(lint) 33 __RCSID("$NetBSD: fgetwc.c,v 1.4 2005/06/12 05:21:27 lukem Exp $"); 34 #endif /* LIBC_SCCS and not lint */ 35 36 #include <assert.h> 37 #include <errno.h> 38 #include <stdio.h> 39 #include <wchar.h> 40 #include "reentrant.h" 41 #include "local.h" 42 43 wint_t 44 __fgetwc_unlock(FILE *fp) 45 { 46 struct wchar_io_data *wcio; 47 mbstate_t *st; 48 wchar_t wc; 49 size_t size; 50 51 _DIAGASSERT(fp != NULL); 52 53 _SET_ORIENTATION(fp, 1); 54 wcio = WCIO_GET(fp); 55 if (wcio == 0) { 56 errno = ENOMEM; 57 return WEOF; 58 } 59 60 /* if there're ungetwc'ed wchars, use them */ 61 if (wcio->wcio_ungetwc_inbuf) { 62 wc = wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf]; 63 64 return wc; 65 } 66 67 st = &wcio->wcio_mbstate_in; 68 69 do { 70 char c; 71 int ch = __sgetc(fp); 72 73 if (ch == EOF) { 74 return WEOF; 75 } 76 77 c = ch; 78 size = mbrtowc(&wc, &c, 1, st); 79 if (size == (size_t)-1) { 80 errno = EILSEQ; 81 return WEOF; 82 } 83 } while (size == (size_t)-2); 84 85 _DIAGASSERT(size == 1); 86 87 return wc; 88 } 89 90 wint_t 91 fgetwc(FILE *fp) 92 { 93 wint_t r; 94 95 _DIAGASSERT(fp != NULL); 96 97 FLOCKFILE(fp); 98 r = __fgetwc_unlock(fp); 99 FUNLOCKFILE(fp); 100 101 return (r); 102 } 103 104