+++ /dev/null
-/*-
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Chris Torek.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)setvbuf.c 8.2 (Berkeley) 11/16/93";
-#endif /* LIBC_SCCS and not lint */
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD: src/lib/libc/stdio/setvbuf.c,v 1.13 2002/09/06 11:23:55 tjr Exp $");
-
-#include "namespace.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include "un-namespace.h"
-#include "local.h"
-#include "libc_private.h"
-
-/*
- * Set one of the three kinds of buffering, optionally including
- * a buffer.
- */
-int
-setvbuf(FILE * __restrict fp, char * __restrict buf, int mode, size_t size)
-{
- int ret, flags;
- size_t iosize;
- int ttyflag;
-
- /*
- * Verify arguments. The `int' limit on `size' is due to this
- * particular implementation. Note, buf and size are ignored
- * when setting _IONBF.
- */
- if (mode != _IONBF)
- if ((mode != _IOFBF && mode != _IOLBF) || (int)size < 0)
- return (EOF);
-
- FLOCKFILE(fp);
- /*
- * Write current buffer, if any. Discard unread input (including
- * ungetc data), cancel line buffering, and free old buffer if
- * malloc()ed. We also clear any eof condition, as if this were
- * a seek.
- */
- ret = 0;
- (void)__sflush(fp);
- if (HASUB(fp))
- FREEUB(fp);
- fp->_r = fp->_lbfsize = 0;
- flags = fp->_flags;
- if (flags & __SMBF)
- free((void *)fp->_bf._base);
- flags &= ~(__SLBF | __SNBF | __SMBF | __SOPT | __SOFF | __SNPT | __SEOF);
-
- /* If setting unbuffered mode, skip all the hard work. */
- if (mode == _IONBF)
- goto nbf;
-
- /*
- * Find optimal I/O size for seek optimization. This also returns
- * a `tty flag' to suggest that we check isatty(fd), but we do not
- * care since our caller told us how to buffer.
- */
- flags |= __swhatbuf(fp, &iosize, &ttyflag);
- if (size == 0) {
- buf = NULL; /* force local allocation */
- size = iosize;
- }
-
- /* Allocate buffer if needed. */
- if (buf == NULL) {
- if ((buf = malloc(size)) == NULL) {
- /*
- * Unable to honor user's request. We will return
- * failure, but try again with file system size.
- */
- ret = EOF;
- if (size != iosize) {
- size = iosize;
- buf = malloc(size);
- }
- }
- if (buf == NULL) {
- /* No luck; switch to unbuffered I/O. */
-nbf:
- fp->_flags = flags | __SNBF;
- fp->_w = 0;
- fp->_bf._base = fp->_p = fp->_nbuf;
- fp->_bf._size = 1;
- FUNLOCKFILE(fp);
- return (ret);
- }
- flags |= __SMBF;
- }
-
- /*
- * Kill any seek optimization if the buffer is not the
- * right size.
- *
- * SHOULD WE ALLOW MULTIPLES HERE (i.e., ok iff (size % iosize) == 0)?
- */
- if (size != iosize)
- flags |= __SNPT;
-
- /*
- * Fix up the FILE fields, and set __cleanup for output flush on
- * exit (since we are buffered in some way).
- */
- if (mode == _IOLBF)
- flags |= __SLBF;
- fp->_flags = flags;
- fp->_bf._base = fp->_p = (unsigned char *)buf;
- fp->_bf._size = size;
- /* fp->_lbfsize is still 0 */
- if (flags & __SWR) {
- /*
- * Begin or continue writing: see __swsetup(). Note
- * that __SNBF is impossible (it was handled earlier).
- */
- if (flags & __SLBF) {
- fp->_w = 0;
- fp->_lbfsize = -fp->_bf._size;
- } else
- fp->_w = size;
- } else {
- /* begin/continue reading, or stay in intermediate state */
- fp->_w = 0;
- }
- __cleanup = _cleanup;
-
- FUNLOCKFILE(fp);
- return (ret);
-}
projects / apple / libc.git / blobdiff