GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/stdio/wbuf.c Lines: 0 16 0.0 %
Date: 2017-11-13 Branches: 0 22 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: wbuf.c,v 1.13 2015/08/31 02:53:57 guenther Exp $ */
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/*-
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 * Copyright (c) 1990, 1993
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 *	The Regents of the University of California.  All rights reserved.
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 *
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 * This code is derived from software contributed to Berkeley by
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 * Chris Torek.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <stdio.h>
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#include <errno.h>
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#include "local.h"
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/*
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 * Write the given character into the (probably full) buffer for
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 * the given file.  Flush the buffer out if it is or becomes full,
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 * or if c=='\n' and the file is line buffered.
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 */
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int
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__swbuf(int c, FILE *fp)
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{
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	int n;
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	_SET_ORIENTATION(fp, -1);
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	/*
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	 * In case we cannot write, or longjmp takes us out early,
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	 * make sure _w is 0 (if fully- or un-buffered) or -_bf._size
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	 * (if line buffered) so that we will get called again.
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	 * If we did not do this, a sufficient number of putc()
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	 * calls might wrap _w from negative to positive.
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	 */
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	fp->_w = fp->_lbfsize;
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	if (cantwrite(fp)) {
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		errno = EBADF;
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		return (EOF);
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	}
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	c = (unsigned char)c;
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	/*
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	 * If it is completely full, flush it out.  Then, in any case,
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	 * stuff c into the buffer.  If this causes the buffer to fill
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	 * completely, or if c is '\n' and the file is line buffered,
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	 * flush it (perhaps a second time).  The second flush will always
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	 * happen on unbuffered streams, where _bf._size==1; __sflush()
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	 * guarantees that putc() will always call wbuf() by setting _w
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	 * to 0, so we need not do anything else.
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	 */
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	n = fp->_p - fp->_bf._base;
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	if (n >= fp->_bf._size) {
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		if (__sflush(fp))
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			return (EOF);
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		n = 0;
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	}
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	fp->_w--;
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	*fp->_p++ = c;
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	if (++n == fp->_bf._size || (fp->_flags & __SLBF && c == '\n'))
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		if (__sflush(fp))
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			return (EOF);
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	return (c);
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}
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DEF_STRONG(__swbuf);