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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. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Packet Pool Management (Packet) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_packet.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxe_packet_release PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the packet release */
/* function call. */
/* */
/* INPUT */
/* */
/* packet_ptr Pointer of packet to release */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_packet_release Actual packet release */
/* function */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nxe_packet_release(NX_PACKET **packet_ptr_ptr)
{
UINT status;
NX_PACKET *packet_ptr;
/* Setup packet pointer. */
packet_ptr = *packet_ptr_ptr;
/* Simple integrity check on the packet. */
if ((packet_ptr == NX_NULL) || (packet_ptr -> nx_packet_pool_owner == NX_NULL) ||
((packet_ptr -> nx_packet_pool_owner) -> nx_packet_pool_id != NX_PACKET_POOL_ID))
{
return(NX_PTR_ERROR);
}
/* Check for an invalid packet prepend pointer. */
/*lint -e{946} suppress pointer subtraction, since it is necessary. */
if (packet_ptr -> nx_packet_prepend_ptr < packet_ptr -> nx_packet_data_start)
{
return(NX_UNDERFLOW);
}
/* Check for an invalid packet append pointer. */
/*lint -e{946} suppress pointer subtraction, since it is necessary. */
if (packet_ptr -> nx_packet_append_ptr > packet_ptr -> nx_packet_data_end)
{
return(NX_OVERFLOW);
}
/* Call actual packet release function. */
status = _nx_packet_release(packet_ptr);
/* Determine if the packet release was successful. */
if (status == NX_SUCCESS)
{
/* Yes, now clear the application's packet pointer so it can't be accidentally
used again by the application. This is only done when error checking is
enabled. */
*packet_ptr_ptr = NX_NULL;
}
/* Return completion status. */
return(status);
}
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