cmfsize.c revision 281075 
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 <contrib/dev/acpica/include/acpi.h>
45#include <contrib/dev/acpica/include/accommon.h>
46#include <contrib/dev/acpica/include/acapps.h>
47#include <stdio.h>
48
49#define _COMPONENT          ACPI_TOOLS
50        ACPI_MODULE_NAME    ("cmfsize")
51
52
53/*******************************************************************************
54 *
55 * FUNCTION:    CmGetFileSize
56 *
57 * PARAMETERS:  File                    - Open file descriptor
58 *
59 * RETURN:      File Size. On error, -1 (ACPI_UINT32_MAX)
60 *
61 * DESCRIPTION: Get the size of a file. Uses seek-to-EOF. File must be open.
62 *              Does not disturb the current file pointer.
63 *
64 ******************************************************************************/
65
66UINT32
67CmGetFileSize (
68    ACPI_FILE               File)
69{
70    long                    FileSize;
71    long                    CurrentOffset;
72    ACPI_STATUS             Status;
73
74
75    /* Save the current file pointer, seek to EOF to obtain file size */
76
77    CurrentOffset = AcpiOsGetFileOffset (File);
78    if (CurrentOffset < 0)
79    {
80        goto OffsetError;
81    }
82
83    Status = AcpiOsSetFileOffset (File, 0, ACPI_FILE_END);
84    if (ACPI_FAILURE (Status))
85    {
86        goto SeekError;
87    }
88
89    FileSize = AcpiOsGetFileOffset (File);
90    if (FileSize < 0)
91    {
92        goto OffsetError;
93    }
94
95    /* Restore original file pointer */
96
97    Status = AcpiOsSetFileOffset (File, CurrentOffset, ACPI_FILE_BEGIN);
98    if (ACPI_FAILURE (Status))
99    {
100        goto SeekError;
101    }
102
103    return ((UINT32) FileSize);
104
105
106OffsetError:
107    AcpiLogError ("Could not get file offset");
108    return (ACPI_UINT32_MAX);
109
110SeekError:
111    AcpiLogError ("Could not set file offset");
112    return (ACPI_UINT32_MAX);
113}
114