oslibcfs.c revision 281075 
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 <contrib/dev/acpica/include/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 *
54 * FUNCTION:    AcpiOsOpenFile
55 *
56 * PARAMETERS:  Path                - File path
57 *              Modes               - File operation type
58 *
59 * RETURN:      File descriptor.
60 *
61 * DESCRIPTION: Open a file for reading (ACPI_FILE_READING) or/and writing
62 *              (ACPI_FILE_WRITING).
63 *
64 ******************************************************************************/
65
66ACPI_FILE
67AcpiOsOpenFile (
68    const char              *Path,
69    UINT8                   Modes)
70{
71    ACPI_FILE               File;
72    UINT32                  i = 0;
73    char                    ModesStr[4];
74
75
76    if (Modes & ACPI_FILE_READING)
77    {
78        ModesStr[i++] = 'r';
79    }
80    if (Modes & ACPI_FILE_WRITING)
81    {
82        ModesStr[i++] = 'w';
83    }
84    if (Modes & ACPI_FILE_BINARY)
85    {
86        ModesStr[i++] = 'b';
87    }
88
89    ModesStr[i++] = '\0';
90
91    File = fopen (Path, ModesStr);
92    if (!File)
93    {
94        perror ("Could not open file");
95    }
96
97    return (File);
98}
99
100
101/*******************************************************************************
102 *
103 * FUNCTION:    AcpiOsCloseFile
104 *
105 * PARAMETERS:  File                - An open file descriptor
106 *
107 * RETURN:      None.
108 *
109 * DESCRIPTION: Close a file opened via AcpiOsOpenFile.
110 *
111 ******************************************************************************/
112
113void
114AcpiOsCloseFile (
115    ACPI_FILE               File)
116{
117    fclose (File);
118}
119
120
121/*******************************************************************************
122 *
123 * FUNCTION:    AcpiOsReadFile
124 *
125 * PARAMETERS:  File                - An open file descriptor
126 *              Buffer              - Data buffer
127 *              Size                - Data block size
128 *              Count               - Number of data blocks
129 *
130 * RETURN:      Number of bytes actually read.
131 *
132 * DESCRIPTION: Read from a file.
133 *
134 ******************************************************************************/
135
136int
137AcpiOsReadFile (
138    ACPI_FILE               File,
139    void                    *Buffer,
140    ACPI_SIZE               Size,
141    ACPI_SIZE               Count)
142{
143    int                     Length;
144
145
146    Length = fread (Buffer, Size, Count, File);
147    if (Length < 0)
148    {
149        perror ("Error reading file");
150    }
151
152    return (Length);
153}
154
155
156/*******************************************************************************
157 *
158 * FUNCTION:    AcpiOsWriteFile
159 *
160 * PARAMETERS:  File                - An open file descriptor
161 *              Buffer              - Data buffer
162 *              Size                - Data block size
163 *              Count               - Number of data blocks
164 *
165 * RETURN:      Number of bytes actually written.
166 *
167 * DESCRIPTION: Write to a file.
168 *
169 ******************************************************************************/
170
171int
172AcpiOsWriteFile (
173    ACPI_FILE               File,
174    void                    *Buffer,
175    ACPI_SIZE               Size,
176    ACPI_SIZE               Count)
177{
178    int                     Length;
179
180
181    Length = fwrite (Buffer, Size, Count, File);
182    if (Length < 0)
183    {
184        perror ("Error writing file");
185    }
186
187    return (Length);
188}
189
190
191/*******************************************************************************
192 *
193 * FUNCTION:    AcpiOsGetFileOffset
194 *
195 * PARAMETERS:  File                - An open file descriptor
196 *
197 * RETURN:      Current file pointer position.
198 *
199 * DESCRIPTION: Get current file offset.
200 *
201 ******************************************************************************/
202
203long
204AcpiOsGetFileOffset (
205    ACPI_FILE               File)
206{
207    long                    Offset;
208
209
210    Offset = ftell (File);
211    return (Offset);
212}
213
214
215/*******************************************************************************
216 *
217 * FUNCTION:    AcpiOsSetFileOffset
218 *
219 * PARAMETERS:  File                - An open file descriptor
220 *              Offset              - New file offset
221 *              From                - From begin/end of file
222 *
223 * RETURN:      Status
224 *
225 * DESCRIPTION: Set current file offset.
226 *
227 ******************************************************************************/
228
229ACPI_STATUS
230AcpiOsSetFileOffset (
231    ACPI_FILE               File,
232    long                    Offset,
233    UINT8                   From)
234{
235    int                     Ret = 0;
236
237
238    if (From == ACPI_FILE_BEGIN)
239    {
240        Ret = fseek (File, Offset, SEEK_SET);
241    }
242    if (From == ACPI_FILE_END)
243    {
244        Ret = fseek (File, Offset, SEEK_END);
245    }
246
247    if (Ret < 0)
248    {
249        return (AE_ERROR);
250    }
251    else
252    {
253        return (AE_OK);
254    }
255}
256