mirror of https://gitee.com/openkylin/linux.git
104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
/******************************************************************************
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*
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* Module Name: cfsize - Common get file size function
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2015, Intel Corp.
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* All rights reserved.
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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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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acapps.h"
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#include <stdio.h>
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#define _COMPONENT ACPI_TOOLS
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ACPI_MODULE_NAME("cmfsize")
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/*******************************************************************************
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*
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* FUNCTION: cm_get_file_size
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*
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* PARAMETERS: file - Open file descriptor
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*
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* RETURN: File Size. On error, -1 (ACPI_UINT32_MAX)
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*
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* DESCRIPTION: Get the size of a file. Uses seek-to-EOF. File must be open.
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* Does not disturb the current file pointer.
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*
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******************************************************************************/
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u32 cm_get_file_size(ACPI_FILE file)
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{
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long file_size;
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long current_offset;
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acpi_status status;
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/* Save the current file pointer, seek to EOF to obtain file size */
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current_offset = acpi_os_get_file_offset(file);
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if (current_offset < 0) {
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goto offset_error;
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}
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status = acpi_os_set_file_offset(file, 0, ACPI_FILE_END);
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if (ACPI_FAILURE(status)) {
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goto seek_error;
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}
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file_size = acpi_os_get_file_offset(file);
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if (file_size < 0) {
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goto offset_error;
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}
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/* Restore original file pointer */
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status = acpi_os_set_file_offset(file, current_offset, ACPI_FILE_BEGIN);
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if (ACPI_FAILURE(status)) {
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goto seek_error;
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}
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return ((u32)file_size);
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offset_error:
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acpi_log_error("Could not get file offset");
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return (ACPI_UINT32_MAX);
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seek_error:
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acpi_log_error("Could not set file offset");
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return (ACPI_UINT32_MAX);
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}
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