tools/power/acpi/os_specific/service_layers/oslibcfs.c

   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
  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  ******************************************************************************/
  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
 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
 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
 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
 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
 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 }