/*- * 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: wsetup.c,v 1.2 1996/08/19 08:33:16 tholo Exp $"; #endif /* LIBC_SCCS and not lint */ #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, nonzero otherwise. */ __swsetup(fp) register 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) 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); }