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fgetwc.c revision 1.3 
      1 /* $NetBSD: fgetwc.c,v 1.3 2003/03/07 07:11:36 tshiozak 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 "reentrant.h"
     36 #include "local.h"
     37 
     38 wint_t
     39 __fgetwc_unlock(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 	_SET_ORIENTATION(fp, 1);
     49 	wcio = WCIO_GET(fp);
     50 	if (wcio == 0) {
     51 		errno = ENOMEM;
     52 		return WEOF;
     53 	}
     54 
     55 	/* if there're ungetwc'ed wchars, use them */
     56 	if (wcio->wcio_ungetwc_inbuf) {
     57 		wc = wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf];
     58 
     59 		return wc;
     60 	}
     61 
     62 	st = &wcio->wcio_mbstate_in;
     63 
     64 	do {
     65 		char c;
     66 		int ch = __sgetc(fp);
     67 
     68 		if (ch == EOF) {
     69 			return WEOF;
     70 		}
     71 
     72 		c = ch;
     73 		size = mbrtowc(&wc, &c, 1, st);
     74 		if (size == (size_t)-1) {
     75 			errno = EILSEQ;
     76 			return WEOF;
     77 		}
     78 	} while (size == (size_t)-2);
     79 
     80 	_DIAGASSERT(size == 1);
     81 
     82 	return wc;
     83 }
     84 
     85 wint_t
     86 fgetwc(FILE *fp)
     87 {
     88 	wint_t r;
     89 
     90 	_DIAGASSERT(fp != NULL);
     91 
     92 	FLOCKFILE(fp);
     93 	r = __fgetwc_unlock(fp);
     94 	FUNLOCKFILE(fp);
     95 
     96 	return (r);
     97 }
     98 
     99