cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cmfsize.c (1683B)

      1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
      2/******************************************************************************
      3 *
      4 * Module Name: cmfsize - Common get file size function
      5 *
      6 * Copyright (C) 2000 - 2022, Intel Corp.
      7 *
      8 *****************************************************************************/
      9
     10#include <acpi/acpi.h>
     11#include "accommon.h"
     12#include "acapps.h"
     13
     14#define _COMPONENT          ACPI_TOOLS
     15ACPI_MODULE_NAME("cmfsize")
     16
     17/*******************************************************************************
     18 *
     19 * FUNCTION:    cm_get_file_size
     20 *
     21 * PARAMETERS:  file                    - Open file descriptor
     22 *
     23 * RETURN:      File Size. On error, -1 (ACPI_UINT32_MAX)
     24 *
     25 * DESCRIPTION: Get the size of a file. Uses seek-to-EOF. File must be open.
     26 *              Does not disturb the current file pointer.
     27 *
     28 ******************************************************************************/
     29u32 cm_get_file_size(ACPI_FILE file)
     30{
     31	long file_size;
     32	long current_offset;
     33	acpi_status status;
     34
     35	/* Save the current file pointer, seek to EOF to obtain file size */
     36
     37	current_offset = ftell(file);
     38	if (current_offset < 0) {
     39		goto offset_error;
     40	}
     41
     42	status = fseek(file, 0, SEEK_END);
     43	if (ACPI_FAILURE(status)) {
     44		goto seek_error;
     45	}
     46
     47	file_size = ftell(file);
     48	if (file_size < 0) {
     49		goto offset_error;
     50	}
     51
     52	/* Restore original file pointer */
     53
     54	status = fseek(file, current_offset, SEEK_SET);
     55	if (ACPI_FAILURE(status)) {
     56		goto seek_error;
     57	}
     58
     59	return ((u32)file_size);
     60
     61offset_error:
     62	fprintf(stderr, "Could not get file offset\n");
     63	return (ACPI_UINT32_MAX);
     64
     65seek_error:
     66	fprintf(stderr, "Could not set file offset\n");
     67	return (ACPI_UINT32_MAX);
     68}