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Annotation of prex-old/usr/lib/libc/stdio/wsetup.c, Revision 1.1.1.1

1.1       nbrk        1: /*-
                      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.
                     16:  * 3. 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:
                     33: #include <stdio.h>
                     34: #include <stdlib.h>
                     35: #include "local.h"
                     36:
                     37:
                     38: /*
                     39:  * Various output routines call wsetup to be sure it is safe to write,
                     40:  * because either _flags does not include __SWR, or _buf is NULL.
                     41:  * _wsetup returns 0 if OK to write, nonzero otherwise.
                     42:  */
                     43: int
                     44: __swsetup(fp)
                     45:        FILE *fp;
                     46: {
                     47:        /* make sure stdio is set up */
                     48:        if (!__sdidinit)
                     49:                __sinit();
                     50:
                     51:        /*
                     52:         * If we are not writing, we had better be reading and writing.
                     53:         */
                     54:        if ((fp->_flags & __SWR) == 0) {
                     55:                if ((fp->_flags & __SRW) == 0)
                     56:                        return (EOF);
                     57:                if (fp->_flags & __SRD) {
                     58:                        /* clobber any ungetc data */
                     59:                        if (HASUB(fp))
                     60:                                FREEUB(fp);
                     61:                        fp->_flags &= ~(__SRD|__SEOF);
                     62:                        fp->_r = 0;
                     63:                        fp->_p = fp->_bf._base;
                     64:                }
                     65:                fp->_flags |= __SWR;
                     66:        }
                     67:
                     68:        /*
                     69:         * Make a buffer if necessary, then set _w.
                     70:         */
                     71:        if (fp->_bf._base == NULL)
                     72:                __smakebuf(fp);
                     73:
                     74:        fp->_w = fp->_flags & (__SNBF|__SLBF) ? 0 : fp->_bf._size;
                     75:        return (0);
                     76: }