69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: cfsize - Common get file size function
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*
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* Copyright (C) 2000 - 2019, Intel Corp.
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*
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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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#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 = ftell(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 = fseek(file, 0, SEEK_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 = ftell(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 = fseek(file, current_offset, SEEK_SET);
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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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fprintf(stderr, "Could not get file offset\n");
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return (ACPI_UINT32_MAX);
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seek_error:
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fprintf(stderr, "Could not set file offset\n");
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return (ACPI_UINT32_MAX);
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}
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