mirror of https://github.com/acidanthera/audk.git
139 lines
4.5 KiB
C
139 lines
4.5 KiB
C
/** @file
|
|
Implementation of internal file buffer allocation functions.
|
|
|
|
Copyright (c) 2010 - 2012, Intel Corporation. All rights reserved.<BR>
|
|
This program and the accompanying materials are licensed and made available
|
|
under the terms and conditions of the BSD License that accompanies this
|
|
distribution. The full text of the license may be found at
|
|
http://opensource.org/licenses/bsd-license.
|
|
|
|
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
|
|
|
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:
|
|
- Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
- 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.
|
|
- 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDERS 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.
|
|
|
|
NetBSD: makebuf.c,v 1.14 2003/08/07 16:43:28 agc Exp
|
|
makebuf.c 8.1 (Berkeley) 6/4/93
|
|
**/
|
|
#include <LibConfig.h>
|
|
|
|
#include "namespace.h"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <assert.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include "reentrant.h"
|
|
#include "local.h"
|
|
#include <MainData.h>
|
|
|
|
/*
|
|
* Allocate a file buffer, or switch to unbuffered I/O.
|
|
* Per the ANSI C standard, ALL tty devices default to line buffered.
|
|
*
|
|
* As a side effect, we set __SOPT or __SNPT (en/dis-able fseek
|
|
* optimisation) right after the fstat() that finds the buffer size.
|
|
*/
|
|
void
|
|
__smakebuf(FILE *fp)
|
|
{
|
|
void *p;
|
|
int flags;
|
|
size_t size;
|
|
int couldbetty;
|
|
|
|
_DIAGASSERT(fp != NULL);
|
|
|
|
if (fp != NULL) {
|
|
if (fp->_flags & __SNBF) {
|
|
fp->_bf._base = fp->_p = fp->_nbuf;
|
|
fp->_bf._size = MB_LEN_MAX;
|
|
return;
|
|
}
|
|
flags = __swhatbuf(fp, &size, &couldbetty);
|
|
if ((p = malloc(size)) == NULL) {
|
|
// malloc failed, act unbuffered.
|
|
fp->_flags |= __SNBF;
|
|
fp->_bf._base = fp->_p = fp->_nbuf;
|
|
fp->_bf._size = 1;
|
|
return;
|
|
}
|
|
gMD->cleanup = _cleanup;
|
|
flags |= __SMBF;
|
|
fp->_bf._base = fp->_p = p;
|
|
fp->_bf._size = (int)size;
|
|
if (couldbetty || isatty(fp->_file))
|
|
flags |= __SLBF;
|
|
fp->_flags |= flags;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Internal routine to determine `proper' buffering for a file.
|
|
*/
|
|
int
|
|
__swhatbuf(FILE *fp, size_t *bufsize, int *couldbetty)
|
|
{
|
|
struct stat st;
|
|
|
|
_DIAGASSERT(fp != NULL);
|
|
_DIAGASSERT(bufsize != NULL);
|
|
_DIAGASSERT(couldbetty != NULL);
|
|
if(fp == NULL) {
|
|
return (__SNPT);
|
|
}
|
|
|
|
if (fp->_file < 0 || fstat(fp->_file, &st) < 0) {
|
|
*couldbetty = 0;
|
|
*bufsize = BUFSIZ;
|
|
return (__SNPT);
|
|
}
|
|
|
|
/* could be a tty iff it is a character device */
|
|
*couldbetty = S_ISCHR(st.st_mode);
|
|
if (st.st_blksize == 0) {
|
|
*bufsize = BUFSIZ;
|
|
return (__SNPT);
|
|
}
|
|
|
|
/*
|
|
* Optimise fseek() only if it is a regular file. (The test for
|
|
* __sseek is mainly paranoia.) It is safe to set _blksize
|
|
* unconditionally; it will only be used if __SOPT is also set.
|
|
*/
|
|
*bufsize = st.st_blksize;
|
|
fp->_blksize = st.st_blksize;
|
|
return ((st.st_mode & S_IFMT) == S_IFREG && fp->_seek == __sseek ?
|
|
__SOPT : __SNPT);
|
|
}
|