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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 */
/** */
/** Media */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
/* Include necessary system files. */
#include "fx_api.h"
#include "fx_system.h"
#include "fx_media.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_media_extended_space_available PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function returns the number of bytes available in the */
/* specified media. */
/* */
/* INPUT */
/* */
/* media_ptr Media control block pointer */
/* available_bytes_ptr Pointer to available bytes */
/* destination */
/* */
/* OUTPUT */
/* */
/* return status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* 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 _fx_media_extended_space_available(FX_MEDIA *media_ptr, ULONG64 *available_bytes_ptr)
{
ULONG64 available_bytes;
ULONG bytes_per_cluster;
ULONG available_clusters;
/* Check the media to make sure it is open. */
if (media_ptr -> fx_media_id != FX_MEDIA_ID)
{
/* Return the media not opened error. */
return(FX_MEDIA_NOT_OPEN);
}
/* If trace is enabled, insert this event into the trace buffer. */
FX_TRACE_IN_LINE_INSERT(FX_TRACE_MEDIA_SPACE_AVAILABLE, media_ptr, available_bytes_ptr, media_ptr -> fx_media_available_clusters, 0, FX_TRACE_MEDIA_EVENTS, 0, 0)
/* Protect against other threads accessing the media. */
FX_PROTECT
/* Pickup the number of free clusters. */
available_clusters = media_ptr -> fx_media_available_clusters;
/* Derive the bytes per cluster. */
bytes_per_cluster = media_ptr -> fx_media_bytes_per_sector * media_ptr -> fx_media_sectors_per_cluster;
/* Calculate the free space. */
available_bytes = ((ULONG64)available_clusters) * ((ULONG64)bytes_per_cluster);
/* Return the value. */
*available_bytes_ptr = available_bytes;
/* Release media protection. */
FX_UNPROTECT
/* Return a successful status to the caller. */
return(FX_SUCCESS);
}