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

/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * 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.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)stdio.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/stdio/stdio.c,v 1.28 2008/05/05 16:14:02 jhb Exp $");

#include "namespace.h"
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "un-namespace.h"
#include "local.h"

/*
 * Small standard I/O/seek/close functions.
 */
int
__sread(cookie, buf, n)
	void *cookie;
	char *buf;
	int n;
{
	FILE *fp = cookie;

	return(_read(fp->_file, buf, (size_t)n));
}

int
__swrite(cookie, buf, n)
	void *cookie;
	char const *buf;
	int n;
{
	FILE *fp = cookie;

	return (_write(fp->_file, buf, (size_t)n));
}

fpos_t
__sseek(cookie, offset, whence)
	void *cookie;
	fpos_t offset;
	int whence;
{
	FILE *fp = cookie;

	return (lseek(fp->_file, (off_t)offset, whence));
}

int
__sclose(cookie)
	void *cookie;
{

	return (_close(((FILE *)cookie)->_file));
}

/*
 * Higher level wrappers.
 */
int
_sread(fp, buf, n)
	FILE *fp;
	char *buf;
	int n;
{
	int ret;

	ret = (*fp->_read)(fp->_cookie, buf, n);
	if (ret > 0) {
		if (fp->_flags & __SOFF) {
			if (fp->_offset <= OFF_MAX - ret)
				fp->_offset += ret;
			else
				fp->_flags &= ~__SOFF;
		}
	} else if (ret < 0)
		fp->_flags &= ~__SOFF;
	return (ret);
}

int
_swrite(fp, buf, n)
	FILE *fp;
	char const *buf;
	int n;
{
	int ret;
	int serrno;

	if (fp->_flags & __SAPP) {
		serrno = errno;
		if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 &&
		    (fp->_flags & __SOPT))
			return (-1);
		errno = serrno;
	}
	ret = (*fp->_write)(fp->_cookie, buf, n);
	/* __SOFF removed even on success in case O_APPEND mode is set. */
	if (ret >= 0) {
		if ((fp->_flags & (__SAPP|__SOFF)) == (__SAPP|__SOFF) &&
		    fp->_offset <= OFF_MAX - ret)
			fp->_offset += ret;
		else
			fp->_flags &= ~__SOFF;

	} else if (ret < 0)
		fp->_flags &= ~__SOFF;
	return (ret);
}

fpos_t
_sseek(fp, offset, whence)
	FILE *fp;
	fpos_t offset;
	int whence;
{
	fpos_t ret;
	int serrno, errret;

	serrno = errno;
	errno = 0;
	ret = (*fp->_seek)(fp->_cookie, offset, whence);
	errret = errno;
	if (errno == 0)
		errno = serrno;
	/*
	 * Disallow negative seeks per POSIX.
	 * It is needed here to help upper level caller
	 * in the cases it can't detect.
	 */
	if (ret < 0) {
		if (errret == 0) {
			if (offset != 0 || whence != SEEK_CUR) {
				if (HASUB(fp))
					FREEUB(fp);
				fp->_p = fp->_bf._base;
				fp->_r = 0;
				fp->_flags &= ~__SEOF;
			}
			fp->_flags |= __SERR;
			errno = EINVAL;
		} else if (errret == ESPIPE)
			fp->_flags &= ~__SAPP;
		fp->_flags &= ~__SOFF;
		ret = -1;
	} else if (fp->_flags & __SOPT) {
		fp->_flags |= __SOFF;
		fp->_offset = ret;
	}
	return (ret);
}
Commit	Line	Data
9385eb3d	1	/*-
e9ce8d39 A	2	* Copyright (c) 1990, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* Chris Torek.
	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.
e9ce8d39 A	16	* 4. Neither the name of the University nor the names of its contributors
	17	* may be used to endorse or promote products derived from this software
	18	* without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	21	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	24	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	* SUCH DAMAGE.
	31	*/
	32
9385eb3d A	33	#if defined(LIBC_SCCS) && !defined(lint)
	34	static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93";
	35	#endif /* LIBC_SCCS and not lint */
	36	#include <sys/cdefs.h>
1f2f436a	37	__FBSDID("$FreeBSD: src/lib/libc/stdio/stdio.c,v 1.28 2008/05/05 16:14:02 jhb Exp $");
e9ce8d39	38
9385eb3d A	39	#include "namespace.h"
9385eb3d A	40	#include <errno.h>
e9ce8d39	41	#include <fcntl.h>
9385eb3d	42	#include <limits.h>
e9ce8d39	43	#include <stdio.h>
9385eb3d A	44	#include <stdlib.h>
	45	#include <unistd.h>
	46	#include "un-namespace.h"
e9ce8d39 A	47	#include "local.h"
	48
	49	/*
	50	* Small standard I/O/seek/close functions.
e9ce8d39 A	51	*/
	52	int
	53	__sread(cookie, buf, n)
	54	void *cookie;
	55	char *buf;
	56	int n;
	57	{
9385eb3d A	58	FILE *fp = cookie;
	59
	60	return(_read(fp->_file, buf, (size_t)n));
e9ce8d39 A	61	}
	62
	63	int
	64	__swrite(cookie, buf, n)
	65	void *cookie;
	66	char const *buf;
	67	int n;
	68	{
9385eb3d	69	FILE *fp = cookie;
e9ce8d39	70
9385eb3d	71	return (_write(fp->_file, buf, (size_t)n));
e9ce8d39 A	72	}
	73
	74	fpos_t
	75	__sseek(cookie, offset, whence)
	76	void *cookie;
	77	fpos_t offset;
	78	int whence;
	79	{
9385eb3d A	80	FILE *fp = cookie;
	81
	82	return (lseek(fp->_file, (off_t)offset, whence));
e9ce8d39 A	83	}
	84
	85	int
	86	__sclose(cookie)
	87	void *cookie;
	88	{
	89
9385eb3d A	90	return (_close(((FILE *)cookie)->_file));
	91	}
	92
	93	/*
	94	* Higher level wrappers.
	95	*/
	96	int
	97	_sread(fp, buf, n)
	98	FILE *fp;
	99	char *buf;
	100	int n;
	101	{
	102	int ret;
	103
	104	ret = (*fp->_read)(fp->_cookie, buf, n);
	105	if (ret > 0) {
	106	if (fp->_flags & __SOFF) {
	107	if (fp->_offset <= OFF_MAX - ret)
	108	fp->_offset += ret;
	109	else
	110	fp->_flags &= ~__SOFF;
	111	}
	112	} else if (ret < 0)
	113	fp->_flags &= ~__SOFF;
	114	return (ret);
	115	}
	116
	117	int
	118	_swrite(fp, buf, n)
	119	FILE *fp;
	120	char const *buf;
	121	int n;
	122	{
	123	int ret;
	124	int serrno;
	125
	126	if (fp->_flags & __SAPP) {
	127	serrno = errno;
	128	if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 &&
	129	(fp->_flags & __SOPT))
	130	return (-1);
	131	errno = serrno;
	132	}
	133	ret = (*fp->_write)(fp->_cookie, buf, n);
	134	/* __SOFF removed even on success in case O_APPEND mode is set. */
	135	if (ret >= 0) {
	136	if ((fp->_flags & (__SAPP\|__SOFF)) == (__SAPP\|__SOFF) &&
	137	fp->_offset <= OFF_MAX - ret)
	138	fp->_offset += ret;
	139	else
	140	fp->_flags &= ~__SOFF;
	141
	142	} else if (ret < 0)
	143	fp->_flags &= ~__SOFF;
	144	return (ret);
	145	}
	146
	147	fpos_t
	148	_sseek(fp, offset, whence)
	149	FILE *fp;
	150	fpos_t offset;
	151	int whence;
	152	{
	153	fpos_t ret;
154	int serrno, errret;
155
156	serrno = errno;
157	errno = 0;
158	ret = (*fp->_seek)(fp->_cookie, offset, whence);
159	errret = errno;
160	if (errno == 0)
161	errno = serrno;
162	/*
163	* Disallow negative seeks per POSIX.
164	* It is needed here to help upper level caller
165	* in the cases it can't detect.
166	*/
167	if (ret < 0) {
168	if (errret == 0) {
169	if (offset != 0 \|\| whence != SEEK_CUR) {
170	if (HASUB(fp))
171	FREEUB(fp);
172	fp->_p = fp->_bf._base;
173	fp->_r = 0;
174	fp->_flags &= ~__SEOF;
175	}
176	fp->_flags \|= __SERR;
177	errno = EINVAL;
178	} else if (errret == ESPIPE)
179	fp->_flags &= ~__SAPP;
180	fp->_flags &= ~__SOFF;
181	ret = -1;
182	} else if (fp->_flags & __SOPT) {
183	fp->_flags \|= __SOFF;
184	fp->_offset = ret;
185	}
186	return (ret);
e9ce8d39	187	}