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/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 * 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.
60 * Does not disturb the current file pointer.
61 *
62 ******************************************************************************/
cm_get_file_size(ACPI_FILE file)63 u32 cm_get_file_size(ACPI_FILE file)
64 {
65 long file_size;
66 long current_offset;
67 acpi_status status;
68
69 /* Save the current file pointer, seek to EOF to obtain file size */
70
71 current_offset = ftell(file);
72 if (current_offset < 0) {
73 goto offset_error;
74 }
75
76 status = fseek(file, 0, SEEK_END);
77 if (ACPI_FAILURE(status)) {
78 goto seek_error;
79 }
80
81 file_size = ftell(file);
82 if (file_size < 0) {
83 goto offset_error;
84 }
85
86 /* Restore original file pointer */
87
88 status = fseek(file, current_offset, SEEK_SET);
89 if (ACPI_FAILURE(status)) {
90 goto seek_error;
91 }
92
93 return ((u32)file_size);
94
95 offset_error:
96 fprintf(stderr, "Could not get file offset\n");
97 return (ACPI_UINT32_MAX);
98
99 seek_error:
100 fprintf(stderr, "Could not set file offset\n");
101 return (ACPI_UINT32_MAX);
102 }
103