csu3_am335x/EVSE/GPL/plc-utils.LNX.2.1.20/source/plc/NVMSelect.c

/*====================================================================*
*
*   Copyright (c) 2013 Qualcomm Atheros, Inc.
*
*   All rights reserved.
*
*====================================================================*/

/*====================================================================*
 *
 *   signed NVMSelect (struct plc * plc, signed old (struct plc *), signed new (struct plc *));
 *
 *   plc.h
 *
 *   read the .nvm header to determine file format; rewind the file
 *   then call the right function to execute the applets;
 *
 *   Contributor(s):
 *      Charles Maier <cmaier@qca.qualcomm.com>
 *
 *--------------------------------------------------------------------*/

#ifndef NVMSELECT_SOURCE
#define NVMSELECT_SOURCE

#include "../tools/error.h"
#include "../tools/files.h"
#include "../plc/plc.h"

signed NVMSelect (struct plc * plc, signed old (struct plc *), signed new (struct plc *))

{
	uint32_t version;
	if (lseek (plc->NVM.file, 0, SEEK_SET))
	{
		error (1, errno, FILE_CANTHOME, plc->NVM.name);
	}
	if (read (plc->NVM.file, & version, sizeof (version)) != sizeof (version))
	{
		error (1, errno, FILE_CANTREAD, plc->NVM.name);
	}
	if (lseek (plc->NVM.file, 0, SEEK_SET))
	{
		error (1, errno, FILE_CANTHOME, plc->NVM.name);
	}
	return (LE32TOH (version) == 0x60000000? old (plc): new (plc));
}

#endif