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name, section, class, id functions work.
perl intrinsic functions (sin, cos, atan2, log, exp, sqrt) can be called using &functionname
only normal_xxx functions left to do

# file name (temp): default_homework 
# used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run()
# 
#
#init some globals
#
# Guy Albertelli
#
# 05/25/2001 H. K. Ng
#
$RANDOMINIT=0;
$pi=atan2(1,1)*4;
$rad2deg=180.0/$pi;
$deg2rad=$pi/180.0;

sub caparesponse_check {
  my $answer='';  #done
  my $type='';    #done
  my $tol_type=''; # gets it's value from whether tol has a % or not done
  my $tol='';     #done
  my $sig='';     #done lowerbnd,upperbnd
  my $sig_lbound=''; #done
  my $sig_ubound=''; #done
  my $ans_fmt='';
  my $units='';     #done
  my $calc='';
  my ($response,$expr)=@_;
  
  ($answer,$type,$tol,$sig,$ans_fmt,
   $units,$calc) = eval $expr.';return $answer,$type,$tol,$sig,$ans_fmt,$units,$calc';
  #type's definitons come from capaParser.h
  if ($type eq '' ) {
    if ( $answer eq ($answer *1.0)) { $type = 2;
    } else { $type = 3; }
  } else {
         if ($type eq 'cs')    { $type = 4;
    } elsif ($type eq 'ci')    { $type = 3;
    } elsif ($type eq 'mc')    { $type = 5;
    } elsif ($type eq 'fml')   { $type = 8;
    } elsif ($type eq 'subj')  { $type = 7;
    } else { return "ERROR: Unknown type of answer: $type" }
  }

  if ($tol eq '') {
    $tol=0.0;
    $tol_type=1; #TOL_ABSOLUTE
  } else {
    if ($tol =~ /%$/) {
      chop $tol;
      $tol_type=2; #TOL_PERCENTAGE
    } else {
      $tol_type=1; #TOL_ABSOLUTE
    }
  }

  if ($sig eq '') {
    $sig_lbound = 0; #SIG_LB_DEFAULT
    $sig_ubound =15; #SIG_UB_DEFAULT
  } else {
    ($sig_lbound,$sig_ubound) = split /,/,$sig;
  }
  my $result = &caparesponse_capa_check_answer($response,$answer,$type,
					       $tol_type,$tol,
					       $sig_lbound,$sig_ubound,
					       $ans_fmt,$units,$calc);

  if    ($result == '1') { $result='EXACT_ANS'; } 
  elsif ($result == '2') { $result='APPROX_ANS'; }
  elsif ($result == '3') { $result='SIG_FAIL'; }
  elsif ($result == '4') { $result='UNIT_FAIL'; }
  elsif ($result == '5') { $result='NO_UNIT'; }
  elsif ($result == '6') { $result='UNIT_OK'; }
  elsif ($result == '7') { $result='INCORRECT'; }
  elsif ($result == '8') { $result='UNIT_NOTNEEDED'; }
  elsif ($result == '9') { $result='ANS_CNT_NOT_MATCH'; }
  elsif ($result =='10') { $result='SUB_RECORDED'; }
  elsif ($result =='11') { $result='BAD_FORMULA'; }
  elsif ($result =='12') { $result='WANTED_NUMERIC'; }
  else  {$result = "ERROR: Unknown Result:$result:$@:";}

  return "$result:<br />Error $error:<br />Answer $answer:<br />Response $response:<br />$type|$tol|$tol_type|$sig:$sig_lbound:$sig_ubound|$units<br />";
}

sub caparesponse_check_list {
  my ($response,$expr)=@_;
  my $result='';
  my $aresult='';
  my $current_answer;
  my $answer = eval $expr.';return $answer';
  my (@list) = eval $answer;
  my (@responselist)=split /,/,$response;
  my $unit='';
  $result.="Final response :$responselist['-1']:<br />";
  if ( $responselist['-1']=~ /(.*[^\s])\s+([^\s]+)/ ) {
    $responselist['-1']=$1;
    $unit=$2;
  }
  $result.="Final response :$responselist['-1']:<br />";
  $unit=~s/\s//;
  my $i=0;
  my $awards='';
  for ($i=0; $i<@list;$i++) {
    if ($unit eq '') {
      $aresult=&caparesponse_check($responselist[$i],
			     $expr.';my $answer='.$list[$i].';');
    } else {
      $aresult=&caparesponse_check($responselist[$i]." $unit",
				   $expr.';my $answer='.$list[$i].';');
    }
    my ($temp)=split /:/, $aresult;
    $awards.="$temp,";
    $result.=$aresult;
  }
  chop $awards;
  return "$awards:<br />$result";
}

sub tex {
  if ( $external::target eq "tex" ) {
    return @_[0];
  } else {
    return @_[1];
  }
}

sub web {
  if ( $external::target eq "tex" ) {
    return @_[1];
  } else {
    if ( $external::target eq "web") {
      return @_[0];
    } else {
      return @_[2];
    }
  }
}

sub problem {
  return '1';
}

sub hinton {
  return 0;
}

sub random {
  my ($start,$end,$step)=@_;
  if ( ! $RANDOMINIT ) { srand($external::randomseed); $RANDOMINIT=1; }
  my $num=1+int(($end-$start)/$step);
  my $result=$start + int(rand() * $num)*$step;
  return $result;
}

sub abs { abs(shift) }
sub sin { sin(shift) }
sub cos { cos(shift) }
sub exp { exp(shift) }
sub int { int(shift) }
sub log { log(shift) }
sub atan2 { atan2($_[0],$_[1]) }
sub sqrt { sqrt(shift) }

sub tan  { sin($_[0]) / cos($_[0]) }
#sub atan { atan2($_[0], 1); }
#sub acos { atan2(sqrt(1 - $_[0] * $_[0]), $_[0] ); }
#sub asin { atan2($_[0], sqrt(1- $_[0] * $_[0]) );  }

sub log10 { log($_[0])/log(10); }

sub factorial {
    my $input = int(shift);
    return "Error - unable to take factorial of an negative number ($input)" if $input < 0;
    return "Error - factorial result is greater than system limit ($input)" if $input > 170;
    return 1 if $input == 0;
    my $result = 1; 
    for (my $i=2; $i<=$input; $i++) { $result *= $i }
    return $result;
}

sub sgn {
    return -1 if $_[0] < 0;
    return 0 if $_[0] == 0;
    return 1 if $_[0] > 0;
}

sub min {
    my @sorted = sort { $a <=> $b || $a cmp $b } @_;
    return shift @sorted;
}

sub max {
    my @sorted = sort { $a <=> $b || $a cmp $b } @_;
    return pop @sorted;
}

sub html {
  if ( $external::target eq "web" ) {
    return @_[0];
  }
}

sub roundto {
    my ($input,$n) = @_;
    return sprintf('%.'.$n.'f',$input);
}

sub to_string {
    my ($input,$n) = @_;
    return sprintf('%'.$n,$input) if $n ne "";
    return sprintf($input) if $n eq "";
}

sub sub_string {
    my ($str,$start,$len) = @_;
    return substr($str,$start-1,$len);
}

sub pow   {return $_[0] ** $_[1]; }
sub ceil  {return (($_[0]-int($_[0]))== 0.0) ? $_[0] : (int($_[0])+ 1); }
sub floor {return int($_[0]);  }

sub format {
  my ($value,$fmt)=@_;
  return sprintf('%.'.$fmt,$value);
}

sub map {
  my $num = $#_/2;
  my $i;
  my @used;
  my @permutation;
  for ($i=0; $i < $num;) {
    $rand = &random(1,$num,1);
    if ( $used[$rand] == '0' ) {
      $i++;
      $used[$rand]='1';
      $permutation[$i]=$rand;
    }
  }
  for ( $i=1 ; $i<$num+1 ; $i++ ) {
    ${$_[$permutation[$i]]}=$_[$i+$num]
  }
}

sub capa_id { return }

sub problem { return }

sub name{
  my $fullname = &EXT('environment.lastname').', '.&EXT('environment.firstname').' '.&EXT('environment.middlename');
  $fullname = "" if $fullname eq ",  ";
  $fullname =~ s/\%2d/-/;
  return $fullname;
}

sub student_number { 
  my $id = &EXT('environment.id');
  $id = '' if $id eq "";
  return $id;
}

sub class {
  my $course = &EXT('course.description');
  $course = '' if $course eq "";
  return $course;
}

sub sec { 
  my $sec = &EXT('request.course.sec');
  $sec = '' if $sec eq "";
  return $sec;
}

sub open_date { 
  my @dc = split(/\s+/,localtime(&EXT('resource.0.opendate')));
  return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$dc[3];
}

sub due_date { 
  my @dc = split(/\s+/,localtime(&EXT('resource.0.duedate')));
  return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$dc[3];
}

sub answer_date { 
  my @dc = split(/\s+/,localtime(&EXT('resource.0.answerdate')));
  return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$dc[3];
 }

sub choose {
  my $num = $_[0];
  return $_[$num];
}

#$external::randomseed=time;
#$a=2;
#$b=2;
#$c=2;
#&map(1,\$a,\$b,\$c,3,4,5);
#print $a."\n".$b."\n";