/*- * 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. * 3. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: *	This product includes software developed by the University of *	California, Berkeley and its contributors. * 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 rcsid[] = "$OpenBSD: wbuf.c,v 1.4 1997/05/31 22:41:32 tholo Exp $";#endif /* LIBC_SCCS and not lint */ #include <stdio.h>#include <errno.h>#include "local.h" /* * Write the given character into the (probably full) buffer for * the given file.  Flush the buffer out if it is or becomes full, * or if c=='\n' and the file is line buffered. */int__swbuf(c, fp)	register int c;	register FILE *fp;{	register int n; 	/*	 * In case we cannot write, or longjmp takes us out early,	 * make sure _w is 0 (if fully- or un-buffered) or -_bf._size	 * (if line buffered) so that we will get called again.	 * If we did not do this, a sufficient number of putc()	 * calls might wrap _w from negative to positive.	 */	fp->_w = fp->_lbfsize;	if (cantwrite(fp)) {		errno = EBADF;		return (EOF);	}	c = (unsigned char)c; 	/*	 * If it is completely full, flush it out.  Then, in any case,	 * stuff c into the buffer.  If this causes the buffer to fill	 * completely, or if c is '\n' and the file is line buffered,	 * flush it (perhaps a second time).  The second flush will always	 * happen on unbuffered streams, where _bf._size==1; fflush()	 * guarantees that putc() will always call wbuf() by setting _w	 * to 0, so we need not do anything else.	 */	n = fp->_p - fp->_bf._base;	if (n >= fp->_bf._size) {		if (fflush(fp))			return (EOF);		n = 0;	}	fp->_w--;	*fp->_p++ = c;	if (++n == fp->_bf._size || (fp->_flags & __SLBF && c == '\n'))		if (fflush(fp))			return (EOF);	return (c);}