1 /* $NetBSD: fgetwc.c,v 1.8 2007/04/01 18:35:53 tnozaki Exp $ */ 2 /* $DragonFly: src/lib/libc/stdio/fgetwc.c,v 1.1 2005/07/25 00:37:41 joerg 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 "namespace.h" 33 #include <assert.h> 34 #include <errno.h> 35 #include <stdio.h> 36 #include <wchar.h> 37 #include "un-namespace.h" 38 39 #include "libc_private.h" 40 #include "local.h" 41 #include "priv_stdio.h" 42 43 wint_t 44 __fgetwc_unlock(FILE *fp) 45 { 46 struct wchar_io_data *wcio; 47 wchar_t wc; 48 size_t nr; 49 50 _DIAGASSERT(fp != NULL); 51 52 _SET_ORIENTATION(fp, 1); 53 wcio = WCIO_GET(fp); 54 _DIAGASSERT(wcio != NULL); 55 56 /* if there're ungetwc'ed wchars, use them */ 57 if (wcio->wcio_ungetwc_inbuf) 58 return(wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf]); 59 60 if (fp->pub._r <= 0) { 61 restart: 62 if (__srefill(fp) != 0) 63 return WEOF; 64 } 65 nr = mbrtowc(&wc, (const char *)fp->pub._p, 66 (size_t)fp->pub._r, &wcio->wcio_mbstate_in); 67 if (nr == (size_t)-1) { 68 fp->pub._flags |= __SERR; 69 return WEOF; 70 } else if (nr == (size_t)-2) { 71 fp->pub._p += fp->pub._r; 72 fp->pub._r = 0; 73 goto restart; 74 } 75 if (wc == L'\0') { 76 while (*fp->pub._p != '\0') { 77 ++fp->pub._p; 78 --fp->pub._r; 79 } 80 nr = 1; 81 } 82 fp->pub._p += nr; 83 fp->pub._r -= nr; 84 85 return wc; 86 } 87 88 wint_t 89 fgetwc(FILE *fp) 90 { 91 wint_t r; 92 93 _DIAGASSERT(fp != NULL); 94 95 FLOCKFILE(fp); 96 r = __fgetwc_unlock(fp); 97 FUNLOCKFILE(fp); 98 99 return (r); 100 } 101 102