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Annotation of prex-old/usr/lib/libc/stdio/fflush.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 <errno.h>
        !            34: #include <stdio.h>
        !            35: #include "local.h"
        !            36:
        !            37: /* Flush a single file, or (if fp is NULL) all files.  */
        !            38: int
        !            39: fflush(fp)
        !            40:        FILE *fp;
        !            41: {
        !            42:
        !            43:        if (fp == NULL)
        !            44:                return (_fwalk(__sflush));
        !            45:        if ((fp->_flags & (__SWR | __SRW)) == 0) {
        !            46:                errno = EBADF;
        !            47:                return (EOF);
        !            48:        }
        !            49:        return (__sflush(fp));
        !            50: }
        !            51:
        !            52: int
        !            53: __sflush(fp)
        !            54:        FILE *fp;
        !            55: {
        !            56:        unsigned char *p;
        !            57:        int n, t;
        !            58:
        !            59:        t = fp->_flags;
        !            60:        if ((t & __SWR) == 0)
        !            61:                return (0);
        !            62:
        !            63:        if ((p = fp->_bf._base) == NULL)
        !            64:                return (0);
        !            65:
        !            66:        n = fp->_p - p;         /* write this much */
        !            67:
        !            68:        /*
        !            69:         * Set these immediately to avoid problems with longjmp and to allow
        !            70:         * exchange buffering (via setvbuf) in user write function.
        !            71:         */
        !            72:        fp->_p = p;
        !            73:        fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size;
        !            74:
        !            75:        for (; n > 0; n -= t, p += t) {
        !            76:                t = __swrite(fp, (char *)p, n);
        !            77:                if (t <= 0) {
        !            78:                        fp->_flags |= __SERR;
        !            79:                        return (EOF);
        !            80:                }
        !            81:        }
        !            82:        return (0);
        !            83: }