[apple/libc.git] / stdio / FreeBSD / fgetwc.c

/*-
 * Copyright (c) 2002-2004 Tim J. Robbins.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/stdio/fgetwc.c,v 1.12 2004/07/20 08:27:27 tjr Exp $");

#include "namespace.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include "un-namespace.h"
#include "libc_private.h"
#include "local.h"
#include "mblocal.h"

/*
 * MT-safe version.
 */
wint_t
fgetwc(FILE *fp)
{
	wint_t r;

	FLOCKFILE(fp);
	ORIENT(fp, 1);
	r = __fgetwc(fp);
	FUNLOCKFILE(fp);

	return (r);
}

/*
 * Non-MT-safe version.
 */
wint_t
__fgetwc(FILE *fp)
{
	wchar_t wc;
	size_t nconv;

	if (fp->_r <= 0 && __srefill(fp))
		return (WEOF);
	if (MB_CUR_MAX == 1) {
		/* Fast path for single-byte encodings. */
		wc = *fp->_p++;
		fp->_r--;
		return (wc);
	}
	do {
		nconv = __mbrtowc(&wc, fp->_p, fp->_r, &fp->_extra->mbstate);
		if (nconv == (size_t)-1)
			break;
		else if (nconv == (size_t)-2)
			continue;
		else if (nconv == 0) {
			/*
			 * Assume that the only valid representation of
			 * the null wide character is a single null byte.
			 */
			fp->_p++;
			fp->_r--;
			return (L'\0');
		} else {
			fp->_p += nconv;
			fp->_r -= nconv;
			return (wc);
		}
	} while (__srefill(fp) == 0);
	fp->_flags |= __SERR;
	errno = EILSEQ;
	return (WEOF);
}
Commit	Line	Data
9385eb3d	1	/*-
3d9156a7	2	* Copyright (c) 2002-2004 Tim J. Robbins.
9385eb3d A	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	15	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	16	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	17	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	18	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	19	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	20	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	21	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	22	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	23	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	24	* SUCH DAMAGE.
	25	*/
	26
	27	#include <sys/cdefs.h>
3d9156a7	28	__FBSDID("$FreeBSD: src/lib/libc/stdio/fgetwc.c,v 1.12 2004/07/20 08:27:27 tjr Exp $");
9385eb3d A	29
	30	#include "namespace.h"
	31	#include <errno.h>
	32	#include <stdio.h>
	33	#include <stdlib.h>
	34	#include <wchar.h>
	35	#include "un-namespace.h"
	36	#include "libc_private.h"
	37	#include "local.h"
3d9156a7	38	#include "mblocal.h"
9385eb3d A	39
	40	/*
	41	* MT-safe version.
	42	*/
	43	wint_t
	44	fgetwc(FILE *fp)
	45	{
	46	wint_t r;
	47
	48	FLOCKFILE(fp);
	49	ORIENT(fp, 1);
	50	r = __fgetwc(fp);
	51	FUNLOCKFILE(fp);
	52
	53	return (r);
	54	}
	55
3d9156a7 A	56	/*
	57	* Non-MT-safe version.
	58	*/
	59	wint_t
	60	__fgetwc(FILE *fp)
9385eb3d	61	{
9385eb3d	62	wchar_t wc;
3d9156a7	63	size_t nconv;
9385eb3d	64
3d9156a7 A	65	if (fp->_r <= 0 && __srefill(fp))
	66	return (WEOF);
	67	if (MB_CUR_MAX == 1) {
	68	/* Fast path for single-byte encodings. */
	69	wc = *fp->_p++;
	70	fp->_r--;
	71	return (wc);
	72	}
	73	do {
	74	nconv = __mbrtowc(&wc, fp->_p, fp->_r, &fp->_extra->mbstate);
	75	if (nconv == (size_t)-1)
9385eb3d	76	break;
3d9156a7 A	77	else if (nconv == (size_t)-2)
	78	continue;
	79	else if (nconv == 0) {
	80	/*
	81	* Assume that the only valid representation of
	82	* the null wide character is a single null byte.
	83	*/
	84	fp->_p++;
	85	fp->_r--;
9385eb3d	86	return (L'\0');
3d9156a7 A	87	} else {
	88	fp->_p += nconv;
	89	fp->_r -= nconv;
	90	return (wc);
	91	}
	92	} while (__srefill(fp) == 0);
9385eb3d	93	fp->_flags \|= __SERR;
3d9156a7	94	errno = EILSEQ;
9385eb3d A	95	return (WEOF);
9385eb3d A	96	}