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Annotation of prex-old/usr/lib/libc/stdio/setvbuf.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:  * Set one of the three kinds of buffering, optionally including
        !            39:  * a buffer.
        !            40:  */
        !            41: int
        !            42: setvbuf(fp, buf, mode, size)
        !            43:        FILE *fp;
        !            44:        char *buf;
        !            45:        int mode;
        !            46:        size_t size;
        !            47: {
        !            48:        int ret, flags;
        !            49:        /*      int ttyflag; */
        !            50:
        !            51:        /*
        !            52:         * Verify arguments.  The `int' limit on `size' is due to this
        !            53:         * particular implementation.  Note, buf and size are ignored
        !            54:         * when setting _IONBF.
        !            55:         */
        !            56:        if (mode != _IONBF)
        !            57:                if ((mode != _IOFBF && mode != _IOLBF) || (int)size < 0)
        !            58:                        return (EOF);
        !            59:
        !            60:        /*
        !            61:         * Write current buffer, if any.  Discard unread input (including
        !            62:         * ungetc data), cancel line buffering, and free old buffer if
        !            63:         * malloc()ed.  We also clear any eof condition, as if this were
        !            64:         * a seek.
        !            65:         */
        !            66:        ret = 0;
        !            67:        (void)__sflush(fp);
        !            68:        if (HASUB(fp))
        !            69:                FREEUB(fp);
        !            70:        fp->_r = 0;
        !            71:        flags = fp->_flags;
        !            72:        if (buf != NULL && (flags & __SMBF))
        !            73:                free((void *)fp->_bf._base);
        !            74:        flags &= ~(__SLBF | __SNBF | __SMBF | __SEOF);
        !            75:
        !            76:        /*
        !            77:         * Fix up the FILE fields, and set __cleanup for output flush on
        !            78:         * exit (since we are buffered in some way).
        !            79:         */
        !            80:        if (mode == _IOLBF)
        !            81:                flags |= __SLBF;
        !            82:        fp->_flags = flags;
        !            83:
        !            84:        /*
        !            85:         * If buffer is NULL, we change only buffering mode.
        !            86:         */
        !            87:        if (buf == NULL)
        !            88:                return 0;
        !            89:
        !            90:        fp->_bf._base = fp->_p = (unsigned char *)buf;
        !            91:        fp->_bf._size = size;
        !            92:        fp->_w = 0;
        !            93:        __cleanup = _cleanup;
        !            94:
        !            95:        return (ret);
        !            96: }