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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** FileX Component */
/** */
/** File */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
/* Include necessary system files. */
#include "fx_api.h"
#include "fx_file.h"
FX_CALLER_CHECKING_EXTERNS
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fxe_file_extended_relative_seek PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the file relative seek call. */
/* */
/* INPUT */
/* */
/* file_ptr File control block pointer */
/* byte_offset Byte offset of the seek */
/* seek_from Direction for relative seek, */
/* legal values are: */
/* */
/* FX_SEEK_BEGIN */
/* FX_SEEK_END */
/* FX_SEEK_FORWARD */
/* FX_SEEK_BACK */
/* */
/* OUTPUT */
/* */
/* return status */
/* */
/* CALLS */
/* */
/* _fx_file_extended_relative_seek Actual relative file seek */
/* service */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 William E. Lamie Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _fxe_file_extended_relative_seek(FX_FILE *file_ptr, ULONG64 byte_offset, UINT seek_from)
{
UINT status;
/* Check for a null file pointer. */
if (file_ptr == FX_NULL)
{
return(FX_PTR_ERROR);
}
/* Check for valid seek from option. */
if ((seek_from != FX_SEEK_BEGIN) && (seek_from != FX_SEEK_END) &&
(seek_from != FX_SEEK_FORWARD) && (seek_from != FX_SEEK_BACK))
{
return(FX_INVALID_OPTION);
}
/* Check for a valid caller. */
FX_CALLER_CHECKING_CODE
/* Call actual file relative seek service. */
status = _fx_file_extended_relative_seek(file_ptr, byte_offset, seek_from);
/* Seek is complete, return status. */
return(status);
}