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Annotation of prex-old/usr/lib/libc/stdio/fflush.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 <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: }