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