mirror of https://github.com/acidanthera/audk.git
138 lines
4.5 KiB
C
138 lines
4.5 KiB
C
/** @file
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Implementation of internal file buffer allocation functions.
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Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License that accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Copyright (c) 1990, 1993
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The Regents of the University of California. All rights reserved.
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This code is derived from software contributed to Berkeley by
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Chris Torek.
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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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- 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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- 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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- 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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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND 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 COPYRIGHT HOLDERS OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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NetBSD: makebuf.c,v 1.14 2003/08/07 16:43:28 agc Exp
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makebuf.c 8.1 (Berkeley) 6/4/93
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**/
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#include <LibConfig.h>
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/EfiSysCall.h>
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#include "reentrant.h"
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#include "local.h"
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#include <MainData.h>
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/*
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* Allocate a file buffer, or switch to unbuffered I/O.
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* Per the ANSI C standard, ALL tty devices default to line buffered.
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*
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* As a side effect, we set __SOPT or __SNPT (en/dis-able fseek
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* optimisation) right after the fstat() that finds the buffer size.
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*/
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void
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__smakebuf(FILE *fp)
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{
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void *p;
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int flags;
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size_t size;
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int couldbetty;
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_DIAGASSERT(fp != NULL);
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if (fp != NULL) {
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if (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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return;
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}
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flags = __swhatbuf(fp, &size, &couldbetty);
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if ((p = malloc(size)) == NULL) {
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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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return;
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}
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gMD->cleanup = _cleanup;
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flags |= __SMBF;
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fp->_bf._base = fp->_p = p;
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fp->_bf._size = (int)size;
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if (couldbetty || isatty(fp->_file))
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flags |= __SLBF;
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fp->_flags |= flags;
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}
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}
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/*
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* Internal routine to determine `proper' buffering for a file.
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*/
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int
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__swhatbuf(FILE *fp, size_t *bufsize, int *couldbetty)
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{
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struct stat st;
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_DIAGASSERT(fp != NULL);
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_DIAGASSERT(bufsize != NULL);
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_DIAGASSERT(couldbetty != NULL);
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if(fp == NULL) {
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return (__SNPT);
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}
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if (fp->_file < 0 || fstat(fp->_file, &st) < 0) {
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*couldbetty = 0;
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*bufsize = BUFSIZ;
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return (__SNPT);
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}
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/* could be a tty iff it is a character device */
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*couldbetty = S_ISCHR(st.st_mode);
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if (st.st_blksize == 0) {
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*bufsize = BUFSIZ;
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return (__SNPT);
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}
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/*
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* Optimise fseek() only if it is a regular file. (The test for
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* __sseek is mainly paranoia.) It is safe to set _blksize
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* unconditionally; it will only be used if __SOPT is also set.
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*/
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*bufsize = st.st_blksize;
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fp->_blksize = st.st_blksize;
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return ((st.st_mode & S_IFMT) == S_IFREG && fp->_seek == __sseek ?
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__SOPT : __SNPT);
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}
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