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Annotation of prex-old/usr/lib/libc/stdio/setvbuf.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:  * 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: }