1/******************************************************************************
2 *
3 * Module Name: oslibcfs - C library OSL for file I/O
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2015, 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
49ACPI_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 ******************************************************************************/
64ACPI_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
102void 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
122int
123acpi_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
150int
151acpi_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
176long 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
198acpi_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