diff options
Diffstat (limited to 'mit-pthreads/stdio/wsetup.c')
| -rw-r--r-- | mit-pthreads/stdio/wsetup.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/mit-pthreads/stdio/wsetup.c b/mit-pthreads/stdio/wsetup.c new file mode 100644 index 00000000000..1c86f45a973 --- /dev/null +++ b/mit-pthreads/stdio/wsetup.c @@ -0,0 +1,91 @@ +/*- + * Copyright (c) 1990 The Regents of the University of California. + * Copyright (c) 1993, 1994 Chris Provenzano. + * 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 *sccsid = "from: @(#)wsetup.c 5.2 (Berkeley) 2/24/91";*/ +static char *rcsid = "$Id$"; +#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 */ + __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); +} |