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1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: cfsize - Common get file size function | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
c8100dc4 | 8 | * Copyright (C) 2000 - 2016, Intel Corp. |
e2b9035f LZ |
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" | |
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47 | |
48 | #define _COMPONENT ACPI_TOOLS | |
49 | ACPI_MODULE_NAME("cmfsize") | |
50 | ||
51 | /******************************************************************************* | |
52 | * | |
53 | * FUNCTION: cm_get_file_size | |
54 | * | |
55 | * PARAMETERS: file - Open file descriptor | |
56 | * | |
57 | * RETURN: File Size. On error, -1 (ACPI_UINT32_MAX) | |
58 | * | |
59 | * DESCRIPTION: Get the size of a file. Uses seek-to-EOF. File must be open. | |
3c9349c9 | 60 | * Does not disturb the current file pointer. |
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61 | * |
62 | ******************************************************************************/ | |
3c9349c9 | 63 | u32 cm_get_file_size(ACPI_FILE file) |
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64 | { |
65 | long file_size; | |
66 | long current_offset; | |
3c9349c9 | 67 | acpi_status status; |
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68 | |
69 | /* Save the current file pointer, seek to EOF to obtain file size */ | |
70 | ||
dd99cbcc | 71 | current_offset = ftell(file); |
e2b9035f LZ |
72 | if (current_offset < 0) { |
73 | goto offset_error; | |
74 | } | |
75 | ||
dd99cbcc | 76 | status = fseek(file, 0, SEEK_END); |
3c9349c9 | 77 | if (ACPI_FAILURE(status)) { |
e2b9035f LZ |
78 | goto seek_error; |
79 | } | |
80 | ||
dd99cbcc | 81 | file_size = ftell(file); |
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82 | if (file_size < 0) { |
83 | goto offset_error; | |
84 | } | |
85 | ||
86 | /* Restore original file pointer */ | |
87 | ||
dd99cbcc | 88 | status = fseek(file, current_offset, SEEK_SET); |
3c9349c9 | 89 | if (ACPI_FAILURE(status)) { |
e2b9035f LZ |
90 | goto seek_error; |
91 | } | |
92 | ||
93 | return ((u32)file_size); | |
94 | ||
95 | offset_error: | |
dd99cbcc | 96 | fprintf(stderr, "Could not get file offset\n"); |
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97 | return (ACPI_UINT32_MAX); |
98 | ||
99 | seek_error: | |
dd99cbcc | 100 | fprintf(stderr, "Could not set file offset\n"); |
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101 | return (ACPI_UINT32_MAX); |
102 | } |