<?php
/*********************************************************************************************************
  "Ensemble" is the proprietary property of The Regents of the University of California ("The Regents.")

  Copyright (c) 2005-10 The Regents of the University of California, Davis campus. All Rights Reserved.

  Redistribution and use in source and binary forms, with or without modification, are permitted by
  nonprofit, research institutions for research use only, provided the conditions in the included
  license agreement are met.

  Refer to the file "ensemble_license.txt" for the license agreement,
  located in the top level directory of this distribution.

**********************************************************************************************************/
//Author: Stefan Tomic
//Janata Lab
//Center for Mind and Brain
//Developed for the Ensemble Project


// checks if a posted field has a valid value. If not, 
// reports an error and provides a link back to the calling form
function check_post()
{
	$arg_list = func_get_args();
	$num_args = func_num_args();
	$field = $arg_list[0];
	$fieldname = $arg_list[1];
	$type = $arg_list[2];
	$null_allowed = $arg_list[3];
	
	if($num_args > 4)
		$lower_limit = $arg_list[4];
	if($num_args > 5)
		$upper_limit = $arg_list[5];
		
	$error = FALSE;
	if( $null_allowed && ($field == "") )
	{
		$error = FALSE;
		return $error;
	}

	if( !$null_allowed && ($field == "") ) 
	{
		
		$error = ENS_QPI_ERROR_CODE_RESPONSE_WAS_BLANK;
		return $error;
	}
	

	if( ($field != "") )
	{
		switch($type)
		{
			case "int16": 
				if(!(preg_match("/(-?)([0-9]{1,5})/",$field)) || !($field >= pow(-2,15) && $field <= (pow(2,15)-1)) ) {
					
					$error = ENS_QPI_ERROR_CODE_RESPONSE_OUT_OF_RANGE_OR_NON_NUM;
							
					
				}
				if((isset($lower_limit) && ($field < $lower_limit)) || (isset($upper_limit) && ($field > $upper_limit))) {
					
					$error = ENS_QPI_ERROR_CODE_RESPONSE_OUT_OF_RANGE;
							
				}
				break;
	
			case "int32":
				if(!(preg_match("/(-?)([0-9]{1,10})/",$field)) || !($field >= pow(-2,31) && $field <= (pow(2,31)-1)) ) {
					
					$error = ENS_QPI_ERROR_CODE_RESPONSE_OUT_OF_RANGE_OR_NON_NUM;
							
				}	
				if((isset($lower_limit) && ($field < $lower_limit)) || (isset($upper_limit) && ($field > $upper_limit))) {
					
					$error = ENS_QPI_ERROR_CODE_RESPONSE_OUT_OF_RANGE;
							
				}
				break;

			case "int64":
				if(!(preg_match("/(-?)([0-9]{1,19})/",$field)) || !($field >= pow(-2,63) && $field <= (pow(2,63)-1)) ) {
					
					$error = ENS_QPI_ERROR_CODE_RESPONSE_OUT_OF_RANGE_OR_NON_NUM;
							
				}
				if((isset($lower_limit) && ($field < $lower_limit)) || (isset($upper_limit) && ($field > $upper_limit))) {
					
					$error = ENS_QPI_ERROR_CODE_RESPONSE_OUT_OF_RANGE;
							
				}
				break;
	
			case "double":
				if(!(preg_match("/([[:digit:]]+)$|^([[:digit:]]*)\.([[:digit:]]+)/",$field))) {
					
					$error = ENS_QPI_ERROR_CODE_RESPONSE_NOT_FLOAT;
							
				}
				if((isset($lower_limit) && ($field < $lower_limit)) || (isset($upper_limit) && ($field > $upper_limit))) {
					
					$error = ENS_QPI_ERROR_CODE_RESPONSE_OUT_OF_RANGE;
							
				}
				break;

			case "text":
				$error = FALSE; //we don't care what is in the text field, as long as it's not blank
				break;

			case "alpha":
				if(!(preg_match("/([[:alpha:] -\']+)/",$field))) {
					$error = ENS_QPI_ERROR_CODE_RESPONSE_NOT_ALPHA;			
				}
				break;
			case "non-numeric":
				if(preg_match("/(.*)([[:digit:]]+)(.*)/",$field)) {
					$error = ENS_QPI_ERROR_CODE_RESPONSE_NUM;
				}
				break;
			default:
				$error = FALSE;
		}
	}
	return($error);
	
	
}


?>