[apple/libc.git] / stdio / FreeBSD / wsetup.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[] = "@(#)wsetup.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/stdio/wsetup.c,v 1.11 2009/01/08 06:38:06 das Exp $");

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "local.h"

/*
 * Various output routines call wsetup to be sure it is safe to write,
 * because either _flags does not include __SWR, or _buf is NULL.
 * _wsetup returns 0 if OK to write; otherwise, it returns EOF and sets errno.
 */
int
__swsetup(fp)
	FILE *fp;
{
	/* make sure stdio is set up */
	if (!__sdidinit)
		__sinit();

	/*
	 * If we are not writing, we had better be reading and writing.
	 */
	if ((fp->_flags & __SWR) == 0) {
		if ((fp->_flags & __SRW) == 0) {
			errno = EBADF;
			fp->_flags |= __SERR;
			return (EOF);
		}
		if (fp->_flags & __SRD) {
			/* clobber any ungetc data */
			if (HASUB(fp))
				FREEUB(fp);
			fp->_flags &= ~(__SRD|__SEOF);
			fp->_r = 0;
			fp->_p = fp->_bf._base;
		}
		fp->_flags |= __SWR;
	}

	/*
	 * Make a buffer if necessary, then set _w.
	 */
	if (fp->_bf._base == NULL)
		__smakebuf(fp);
	if (fp->_flags & __SLBF) {
		/*
		 * It is line buffered, so make _lbfsize be -_bufsize
		 * for the putc() macro.  We will change _lbfsize back
		 * to 0 whenever we turn off __SWR.
		 */
		fp->_w = 0;
		fp->_lbfsize = -fp->_bf._size;
	} else
		fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;
	return (0);
}
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[] = "@(#)wsetup.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/wsetup.c,v 1.11 2009/01/08 06:38:06 das Exp $");
e9ce8d39	38
3d9156a7	39	#include <errno.h>
e9ce8d39 A	40	#include <stdio.h>
	41	#include <stdlib.h>
	42	#include "local.h"
	43
	44	/*
	45	* Various output routines call wsetup to be sure it is safe to write,
	46	* because either _flags does not include __SWR, or _buf is NULL.
3d9156a7	47	* _wsetup returns 0 if OK to write; otherwise, it returns EOF and sets errno.
e9ce8d39 A	48	*/
	49	int
	50	__swsetup(fp)
9385eb3d	51	FILE *fp;
e9ce8d39 A	52	{
	53	/* make sure stdio is set up */
	54	if (!__sdidinit)
	55	__sinit();
	56
	57	/*
	58	* If we are not writing, we had better be reading and writing.
	59	*/
	60	if ((fp->_flags & __SWR) == 0) {
3d9156a7 A	61	if ((fp->_flags & __SRW) == 0) {
3d9156a7 A	62	errno = EBADF;
1f2f436a	63	fp->_flags \|= __SERR;
e9ce8d39	64	return (EOF);
3d9156a7	65	}
e9ce8d39 A	66	if (fp->_flags & __SRD) {
	67	/* clobber any ungetc data */
	68	if (HASUB(fp))
	69	FREEUB(fp);
	70	fp->_flags &= ~(__SRD\|__SEOF);
	71	fp->_r = 0;
	72	fp->_p = fp->_bf._base;
	73	}
	74	fp->_flags \|= __SWR;
	75	}
	76
	77	/*
	78	* Make a buffer if necessary, then set _w.
	79	*/
	80	if (fp->_bf._base == NULL)
	81	__smakebuf(fp);
	82	if (fp->_flags & __SLBF) {
	83	/*
	84	* It is line buffered, so make _lbfsize be -_bufsize
	85	* for the putc() macro. We will change _lbfsize back
	86	* to 0 whenever we turn off __SWR.
	87	*/
	88	fp->_w = 0;
	89	fp->_lbfsize = -fp->_bf._size;
	90	} else
	91	fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;
	92	return (0);
	93	}