1 /******************************************************************************
2 *
3 * Module Name: oslibcfs - C library OSL for file I/O
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2014, 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 <stdio.h>
46 #include <stdarg.h>
47
48 #define _COMPONENT ACPI_OS_SERVICES
49 ACPI_MODULE_NAME("oslibcfs")
50
51 /*******************************************************************************
52 *
53 * FUNCTION: acpi_os_open_file
54 *
55 * PARAMETERS: path - File path
56 * modes - File operation type
57 *
58 * RETURN: File descriptor.
59 *
60 * DESCRIPTION: Open a file for reading (ACPI_FILE_READING) or/and writing
61 * (ACPI_FILE_WRITING).
62 *
63 ******************************************************************************/
acpi_os_open_file(const char * path,u8 modes)64 ACPI_FILE acpi_os_open_file(const char *path, u8 modes)
65 {
66 ACPI_FILE file;
67 u32 i = 0;
68 char modes_str[4];
69
70 if (modes & ACPI_FILE_READING) {
71 modes_str[i++] = 'r';
72 }
73 if (modes & ACPI_FILE_WRITING) {
74 modes_str[i++] = 'w';
75 }
76 if (modes & ACPI_FILE_BINARY) {
77 modes_str[i++] = 'b';
78 }
79
80 modes_str[i++] = '\0';
81
82 file = fopen(path, modes_str);
83 if (!file) {
84 perror("Could not open file");
85 }
86
87 return (file);
88 }
89
90 /*******************************************************************************
91 *
92 * FUNCTION: acpi_os_close_file
93 *
94 * PARAMETERS: file - An open file descriptor
95 *
96 * RETURN: None.
97 *
98 * DESCRIPTION: Close a file opened via acpi_os_open_file.
99 *
100 ******************************************************************************/
101
acpi_os_close_file(ACPI_FILE file)102 void acpi_os_close_file(ACPI_FILE file)
103 {
104 fclose(file);
105 }
106
107 /*******************************************************************************
108 *
109 * FUNCTION: acpi_os_read_file
110 *
111 * PARAMETERS: file - An open file descriptor
112 * buffer - Data buffer
113 * size - Data block size
114 * count - Number of data blocks
115 *
116 * RETURN: Number of bytes actually read.
117 *
118 * DESCRIPTION: Read from a file.
119 *
120 ******************************************************************************/
121
122 int
acpi_os_read_file(ACPI_FILE file,void * buffer,acpi_size size,acpi_size count)123 acpi_os_read_file(ACPI_FILE file, void *buffer, acpi_size size, acpi_size count)
124 {
125 int length;
126
127 length = fread(buffer, size, count, file);
128 if (length < 0) {
129 perror("Error reading file");
130 }
131
132 return (length);
133 }
134
135 /*******************************************************************************
136 *
137 * FUNCTION: acpi_os_write_file
138 *
139 * PARAMETERS: file - An open file descriptor
140 * buffer - Data buffer
141 * size - Data block size
142 * count - Number of data blocks
143 *
144 * RETURN: Number of bytes actually written.
145 *
146 * DESCRIPTION: Write to a file.
147 *
148 ******************************************************************************/
149
150 int
acpi_os_write_file(ACPI_FILE file,void * buffer,acpi_size size,acpi_size count)151 acpi_os_write_file(ACPI_FILE file,
152 void *buffer, acpi_size size, acpi_size count)
153 {
154 int length;
155
156 length = fwrite(buffer, size, count, file);
157 if (length < 0) {
158 perror("Error writing file");
159 }
160
161 return (length);
162 }
163
164 /*******************************************************************************
165 *
166 * FUNCTION: acpi_os_get_file_offset
167 *
168 * PARAMETERS: file - An open file descriptor
169 *
170 * RETURN: Current file pointer position.
171 *
172 * DESCRIPTION: Get current file offset.
173 *
174 ******************************************************************************/
175
acpi_os_get_file_offset(ACPI_FILE file)176 long acpi_os_get_file_offset(ACPI_FILE file)
177 {
178 long offset;
179
180 offset = ftell(file);
181 return (offset);
182 }
183
184 /*******************************************************************************
185 *
186 * FUNCTION: acpi_os_set_file_offset
187 *
188 * PARAMETERS: file - An open file descriptor
189 * offset - New file offset
190 * from - From begin/end of file
191 *
192 * RETURN: Status
193 *
194 * DESCRIPTION: Set current file offset.
195 *
196 ******************************************************************************/
197
acpi_os_set_file_offset(ACPI_FILE file,long offset,u8 from)198 acpi_status acpi_os_set_file_offset(ACPI_FILE file, long offset, u8 from)
199 {
200 int ret = 0;
201
202 if (from == ACPI_FILE_BEGIN) {
203 ret = fseek(file, offset, SEEK_SET);
204 }
205 if (from == ACPI_FILE_END) {
206 ret = fseek(file, offset, SEEK_END);
207 }
208
209 if (ret < 0) {
210 return (AE_ERROR);
211 } else {
212 return (AE_OK);
213 }
214 }
215