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 - 2023, 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}
69