1/******************************************************************************
2 *
3 * Module Name: cfsize - Common get file size function
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2015, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions, and the following disclaimer,
16 *    without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 *    substantially similar to the "NO WARRANTY" disclaimer below
19 *    ("Disclaimer") and any redistribution must be conditioned upon
20 *    including a substantially similar Disclaimer requirement for further
21 *    binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 *    of any contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44#include <acpi/acpi.h>
45#include "accommon.h"
46#include "acapps.h"
47#include <stdio.h>
48
49#define _COMPONENT          ACPI_TOOLS
50ACPI_MODULE_NAME("cmfsize")
51
52/*******************************************************************************
53 *
54 * FUNCTION:    cm_get_file_size
55 *
56 * PARAMETERS:  file                    - Open file descriptor
57 *
58 * RETURN:      File Size. On error, -1 (ACPI_UINT32_MAX)
59 *
60 * DESCRIPTION: Get the size of a file. Uses seek-to-EOF. File must be open.
61 *              Does not disturb the current file pointer.
62 *
63 ******************************************************************************/
64u32 cm_get_file_size(ACPI_FILE file)
65{
66	long file_size;
67	long current_offset;
68	acpi_status status;
69
70	/* Save the current file pointer, seek to EOF to obtain file size */
71
72	current_offset = acpi_os_get_file_offset(file);
73	if (current_offset < 0) {
74		goto offset_error;
75	}
76
77	status = acpi_os_set_file_offset(file, 0, ACPI_FILE_END);
78	if (ACPI_FAILURE(status)) {
79		goto seek_error;
80	}
81
82	file_size = acpi_os_get_file_offset(file);
83	if (file_size < 0) {
84		goto offset_error;
85	}
86
87	/* Restore original file pointer */
88
89	status = acpi_os_set_file_offset(file, current_offset, ACPI_FILE_BEGIN);
90	if (ACPI_FAILURE(status)) {
91		goto seek_error;
92	}
93
94	return ((u32)file_size);
95
96offset_error:
97	acpi_log_error("Could not get file offset");
98	return (ACPI_UINT32_MAX);
99
100seek_error:
101	acpi_log_error("Could not set file offset");
102	return (ACPI_UINT32_MAX);
103}
104