text: /******************************************************************************
   *
   * Module Name: oslibcfs - C library OSL for file I/O
   *
   *****************************************************************************/
  
  /*
   * Copyright (C) 2000 - 2016, Intel Corp.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions, and the following disclaimer,
   *    without modification.
   * 2. Redistributions in binary form must reproduce at minimum a disclaimer
   *    substantially similar to the "NO WARRANTY" disclaimer below
   *    ("Disclaimer") and any redistribution must be conditioned upon
   *    including a substantially similar Disclaimer requirement for further
   *    binary redistribution.
   * 3. Neither the names of the above-listed copyright holders nor the names
   *    of any contributors may be used to endorse or promote products derived
   *    from this software without specific prior written permission.
   *
   * Alternatively, this software may be distributed under the terms of the
   * GNU General Public License ("GPL") version 2 as published by the Free
   * Software Foundation.
   *
   * NO WARRANTY
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
   * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGES.
   */
  
  #include <contrib/dev/acpica/include/acpi.h>
  #include <stdio.h>
  #include <stdarg.h>
  
  #define _COMPONENT          ACPI_OS_SERVICES
          ACPI_MODULE_NAME    ("oslibcfs")
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiOsOpenFile
   *
   * PARAMETERS:  Path                - File path
   *              Modes               - File operation type
   *
   * RETURN:      File descriptor.
   *
   * DESCRIPTION: Open a file for reading (ACPI_FILE_READING) or/and writing
   *              (ACPI_FILE_WRITING).
   *
   ******************************************************************************/
  
  ACPI_FILE
  AcpiOsOpenFile (
      const char              *Path,
      UINT8                   Modes)
  {
      ACPI_FILE               File;
      UINT32                  i = 0;
      char                    ModesStr[4];
  
  
      if (Modes & ACPI_FILE_READING)
      {
          ModesStr[i++] = 'r';
      }
      if (Modes & ACPI_FILE_WRITING)
      {
          ModesStr[i++] = 'w';
      }
  
      if (Modes & ACPI_FILE_BINARY)
      {
          ModesStr[i++] = 'b';
      }
  
      ModesStr[i++] = '\0';
  
      File = fopen (Path, ModesStr);
      if (!File)
      {
          perror ("Could not open file");
      }
  
      return (File);
  }
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiOsCloseFile
   *
   * PARAMETERS:  File                - An open file descriptor
   *
   * RETURN:      None.
   *
   * DESCRIPTION: Close a file opened via AcpiOsOpenFile.
   *
   ******************************************************************************/
  
  void
  AcpiOsCloseFile (
      ACPI_FILE               File)
  {
  
      fclose (File);
  }
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiOsReadFile
   *
   * PARAMETERS:  File                - An open file descriptor
   *              Buffer              - Data buffer
   *              Size                - Data block size
   *              Count               - Number of data blocks
   *
   * RETURN:      Number of bytes actually read.
   *
   * DESCRIPTION: Read from a file.
   *
   ******************************************************************************/
  
  int
  AcpiOsReadFile (
      ACPI_FILE               File,
      void                    *Buffer,
      ACPI_SIZE               Size,
      ACPI_SIZE               Count)
  {
      int                     Length;
  
  
      Length = fread (Buffer, Size, Count, File);
      if (Length < 0)
      {
          perror ("Error reading file");
      }
  
      return (Length);
  }
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiOsWriteFile
   *
   * PARAMETERS:  File                - An open file descriptor
   *              Buffer              - Data buffer
   *              Size                - Data block size
   *              Count               - Number of data blocks
   *
   * RETURN:      Number of bytes actually written.
   *
   * DESCRIPTION: Write to a file.
   *
   ******************************************************************************/
  
  int
  AcpiOsWriteFile (
      ACPI_FILE               File,
      void                    *Buffer,
      ACPI_SIZE               Size,
      ACPI_SIZE               Count)
  {
      int                     Length;
  
  
      Length = fwrite (Buffer, Size, Count, File);
      if (Length < 0)
      {
          perror ("Error writing file");
      }
  
      return (Length);
  }
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiOsGetFileOffset
   *
   * PARAMETERS:  File                - An open file descriptor
   *
   * RETURN:      Current file pointer position.
   *
   * DESCRIPTION: Get current file offset.
   *
   ******************************************************************************/
  
  long
  AcpiOsGetFileOffset (
      ACPI_FILE               File)
  {
      long                    Offset;
  
  
      Offset = ftell (File);
      return (Offset);
  }
  
  
  /*******************************************************************************
   *
   * FUNCTION:    AcpiOsSetFileOffset
   *
   * PARAMETERS:  File                - An open file descriptor
   *              Offset              - New file offset
   *              From                - From begin/end of file
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Set current file offset.
   *
   ******************************************************************************/
  
  ACPI_STATUS
  AcpiOsSetFileOffset (
      ACPI_FILE               File,
      long                    Offset,
      UINT8                   From)
  {
      int                     Ret = 0;
  
  
      if (From == ACPI_FILE_BEGIN)
      {
          Ret = fseek (File, Offset, SEEK_SET);
      }
  
      if (From == ACPI_FILE_END)
      {
          Ret = fseek (File, Offset, SEEK_END);
      }
  
      if (Ret < 0)
      {
          return (AE_ERROR);
      }
      else
      {
          return (AE_OK);
      }
  }
  