111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)setvbuf.c 5.2 (Berkeley) 2/1/91";
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#endif /* LIBC_SCCS and not lint */
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#include <stdio.h>
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#include <stdlib.h>
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#include "local.h"
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/*
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* Set one of the three kinds of buffering, optionally including
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* a buffer.
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*/
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setvbuf(fp, buf, mode, size)
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register FILE *fp;
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char *buf;
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register int mode;
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register size_t size;
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{
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/*
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* Verify arguments. The `int' limit on `size' is due to this
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* particular implementation.
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*/
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if ((mode != _IOFBF && mode != _IOLBF && mode != _IONBF) ||
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(int)size < 0)
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return (EOF);
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/*
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* Write current buffer, if any; drop read count, if any.
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* Make sure putc() will not think fp is line buffered.
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* Free old buffer if it was from malloc(). Clear line and
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* non buffer flags, and clear malloc flag.
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*/
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(void) __sflush(fp);
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fp->_r = 0;
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fp->_lbfsize = 0;
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if (fp->_flags & __SMBF)
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free((void *)fp->_bf._base);
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fp->_flags &= ~(__SLBF|__SNBF|__SMBF);
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/*
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* Now put back whichever flag is needed, and fix _lbfsize
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* if line buffered. Ensure output flush on exit if the
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* stream will be buffered at all.
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*/
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switch (mode) {
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case _IONBF:
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fp->_flags |= __SNBF;
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fp->_bf._base = fp->_p = fp->_nbuf;
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fp->_bf._size = 1;
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break;
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case _IOLBF:
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fp->_flags |= __SLBF;
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fp->_lbfsize = -size;
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/* FALLTHROUGH */
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case _IOFBF:
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/* no flag */
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__cleanup = _cleanup;
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fp->_bf._base = fp->_p = (unsigned char *)buf;
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fp->_bf._size = size;
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break;
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}
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/*
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* Patch up write count if necessary.
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*/
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if (fp->_flags & __SWR)
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fp->_w = fp->_flags & (__SLBF|__SNBF) ? 0 : size;
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return (0);
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}
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