1 /******************************************************************************
2  *
3  * Module Name: cfsize - Common get file size function
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2016, 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.h"
45 #include "accommon.h"
46 #include "acapps.h"
47 
48 #define _COMPONENT          ACPI_TOOLS
49         ACPI_MODULE_NAME    ("cmfsize")
50 
51 
52 /*******************************************************************************
53  *
54  * FUNCTION:    CmGetFileSize
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  ******************************************************************************/
64 
65 UINT32
66 CmGetFileSize (
67     ACPI_FILE               File)
68 {
69     long                    FileSize;
70     long                    CurrentOffset;
71     ACPI_STATUS             Status;
72 
73 
74     /* Save the current file pointer, seek to EOF to obtain file size */
75 
76     CurrentOffset = ftell (File);
77     if (CurrentOffset < 0)
78     {
79         goto OffsetError;
80     }
81 
82     Status = fseek (File, 0, SEEK_END);
83     if (ACPI_FAILURE (Status))
84     {
85         goto SeekError;
86     }
87 
88     FileSize = ftell (File);
89     if (FileSize < 0)
90     {
91         goto OffsetError;
92     }
93 
94     /* Restore original file pointer */
95 
96     Status = fseek (File, CurrentOffset, SEEK_SET);
97     if (ACPI_FAILURE (Status))
98     {
99         goto SeekError;
100     }
101 
102     return ((UINT32) FileSize);
103 
104 
105 OffsetError:
106     fprintf (stderr, "Could not get file offset\n");
107     return (ACPI_UINT32_MAX);
108 
109 SeekError:
110     fprintf (stderr, "Could not set file offset\n");
111     return (ACPI_UINT32_MAX);
112 }
113