1/* $NetBSD: fgetwc.c,v 1.12 2012/03/13 21:13:46 christos 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 1.12 2012/03/13 21:13:46 christos 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 43wint_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->_r <= 0) { 61restart: 62 if (__srefill(fp) != 0) 63 return WEOF; 64 } 65 nr = mbrtowc(&wc, (const char *)fp->_p, 66 (size_t)fp->_r, &wcio->wcio_mbstate_in); 67 if (nr == (size_t)-1) { 68 fp->_flags |= __SERR; 69 return WEOF; 70 } else if (nr == (size_t)-2) { 71 fp->_p += fp->_r; 72 fp->_r = 0; 73 goto restart; 74 } 75 if (wc == L'\0') { 76 while (*fp->_p != '\0') { 77 ++fp->_p; 78 --fp->_r; 79 } 80 nr = 1; 81 } 82 fp->_p += nr; 83 _DIAGASSERT(__type_fit(int, fp->_r - nr)); 84 fp->_r -= (int)nr; 85 86 return wc; 87} 88 89wint_t 90fgetwc(FILE *fp) 91{ 92 wint_t r; 93 94 _DIAGASSERT(fp != NULL); 95 96 FLOCKFILE(fp); 97 r = __fgetwc_unlock(fp); 98 FUNLOCKFILE(fp); 99 100 return r; 101} 102 103