csu3_am335x/EVSE/GPL/open-plc-utils-0.3/plc/NVMSelect.c

/*====================================================================*
 *
 *   Copyright (c) 2013 Qualcomm Atheros, Inc.
 *
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 *   without modification, are permitted (subject to the limitations
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 *     notice, this list of conditions and the following disclaimer.
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 *     disclaimer in the documentation and/or other materials
 *     provided with the distribution.
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 *   * Neither the name of Qualcomm Atheros nor the names of
 *     its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written
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/*====================================================================*
 *
 *   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
 *
 *--------------------------------------------------------------------*/

#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