mirror of https://github.com/acidanthera/audk.git
101 lines
3.5 KiB
C
101 lines
3.5 KiB
C
/** @file
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Implementation of fread as declared in <stdio.h>.
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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: fread.c,v 1.16 2003/08/07 16:43:25 agc Exp
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fread.c 8.2 (Berkeley) 12/11/93
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**/
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#include <LibConfig.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include "reentrant.h"
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#include "local.h"
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size_t
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fread(void *buf, size_t size, size_t count, FILE *fp)
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{
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size_t resid;
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char *p;
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int r;
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size_t total;
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_DIAGASSERT(fp != NULL);
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if(fp == NULL) {
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errno = EINVAL;
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return (0);
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}
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/*
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* The ANSI standard requires a return value of 0 for a count
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* or a size of 0. Whilst ANSI imposes no such requirements on
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* fwrite, the SUSv2 does.
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*/
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if ((resid = count * size) == 0)
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return (0);
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_DIAGASSERT(buf != NULL);
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FLOCKFILE(fp);
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if (fp->_r < 0)
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fp->_r = 0;
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total = resid;
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p = buf;
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while (resid > (size_t)(r = fp->_r)) {
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(void)memcpy((void *)p, (void *)fp->_p, (size_t)r);
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fp->_p += r;
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/* fp->_r = 0 ... done in __srefill */
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p += r;
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resid -= r;
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if (__srefill(fp)) {
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/* no more input: return partial result */
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FUNLOCKFILE(fp);
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return ((total - resid) / size);
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}
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}
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(void)memcpy((void *)p, (void *)fp->_p, resid);
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fp->_r -= (int)resid;
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fp->_p += resid;
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FUNLOCKFILE(fp);
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return (count);
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}
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