1 /******************************************************************************
3 * Module Name: oslibcfs - C library OSL for file I/O
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2016, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
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.
44 #include <acpi/acpi.h>
48 #define _COMPONENT ACPI_OS_SERVICES
49 ACPI_MODULE_NAME("oslibcfs")
51 /*******************************************************************************
53 * FUNCTION: acpi_os_open_file
55 * PARAMETERS: path - File path
56 * modes - File operation type
58 * RETURN: File descriptor.
60 * DESCRIPTION: Open a file for reading (ACPI_FILE_READING) or/and writing
61 * (ACPI_FILE_WRITING).
63 ******************************************************************************/
64 ACPI_FILE acpi_os_open_file(const char *path, u8 modes)
70 if (modes & ACPI_FILE_READING) {
73 if (modes & ACPI_FILE_WRITING) {
77 if (modes & ACPI_FILE_BINARY) {
81 modes_str[i++] = '\0';
83 file = fopen(path, modes_str);
85 perror("Could not open file");
91 /*******************************************************************************
93 * FUNCTION: acpi_os_close_file
95 * PARAMETERS: file - An open file descriptor
99 * DESCRIPTION: Close a file opened via acpi_os_open_file.
101 ******************************************************************************/
103 void acpi_os_close_file(ACPI_FILE file)
109 /*******************************************************************************
111 * FUNCTION: acpi_os_read_file
113 * PARAMETERS: file - An open file descriptor
114 * buffer - Data buffer
115 * size - Data block size
116 * count - Number of data blocks
118 * RETURN: Number of bytes actually read.
120 * DESCRIPTION: Read from a file.
122 ******************************************************************************/
125 acpi_os_read_file(ACPI_FILE file, void *buffer, acpi_size size, acpi_size count)
129 length = fread(buffer, size, count, file);
131 perror("Error reading file");
137 /*******************************************************************************
139 * FUNCTION: acpi_os_write_file
141 * PARAMETERS: file - An open file descriptor
142 * buffer - Data buffer
143 * size - Data block size
144 * count - Number of data blocks
146 * RETURN: Number of bytes actually written.
148 * DESCRIPTION: Write to a file.
150 ******************************************************************************/
153 acpi_os_write_file(ACPI_FILE file,
154 void *buffer, acpi_size size, acpi_size count)
158 length = fwrite(buffer, size, count, file);
160 perror("Error writing file");
166 /*******************************************************************************
168 * FUNCTION: acpi_os_get_file_offset
170 * PARAMETERS: file - An open file descriptor
172 * RETURN: Current file pointer position.
174 * DESCRIPTION: Get current file offset.
176 ******************************************************************************/
178 long acpi_os_get_file_offset(ACPI_FILE file)
182 offset = ftell(file);
186 /*******************************************************************************
188 * FUNCTION: acpi_os_set_file_offset
190 * PARAMETERS: file - An open file descriptor
191 * offset - New file offset
192 * from - From begin/end of file
196 * DESCRIPTION: Set current file offset.
198 ******************************************************************************/
200 acpi_status acpi_os_set_file_offset(ACPI_FILE file, long offset, u8 from)
204 if (from == ACPI_FILE_BEGIN) {
205 ret = fseek(file, offset, SEEK_SET);
208 if (from == ACPI_FILE_END) {
209 ret = fseek(file, offset, SEEK_END);