#This script is designed to run with Understand - CodeCheck
use base ("Understand::Codecheck");
use strict;


use constant ERR1 => 'cstdlib function %2 used in file %1';

sub register_tr_text() {
  my $check = shift;
  $check->add_tr_text(ERR1);
}

sub name { return "18-0-2 The library functions atof, atoi and atol from library <cstdlib> shall not be used";}

sub description { return "18-0-2 (Required) The library functions atof, atoi and atol from library <cstdlib> shall not be used";}

sub detailed_description { return <<"END_DESC"
<p><b>Rationale</b><br>
These functions have undefined behaviour associated with them when the string cannot be
converted.</p>
<b>Example</b><pre style="margin-top:0;padding-top:0;">
#include <cstdlib>
int32_t f ( const char_t * numstr )
{
return atoi ( numstr ); // Non-compliant
}
</pre>
END_DESC
}

sub test_language {
  my $language = shift;
  return $language =~ /C\+\+/; #Handles C and C++
}

sub test_entity { return 1;}

sub test_global { return 0;}

sub define_options{}
our %seen;
sub check {
  my $check = shift; 
  my $file = shift;
  return unless $file->kind->check("file ~unknown ~unresolved");
 	foreach my $libFuncs($file->filerefs(" ","Function")){
 		if($libFuncs->ent->name eq "atof" || $libFuncs->ent->name eq "atoi" || $libFuncs->ent->name eq "atol"){
 			my $libUsed = includeCheck($file);
      if($libUsed){
        $check->violation($libFuncs->ent,$file,$libFuncs->line,$libFuncs->column,ERR1,$file->name,$libFuncs->ent->name);
      }
    }
 	}
  %seen=();
}

sub includeCheck {
  my $file = shift;
  
  if ($seen{$file->id}){
    return 0;
  }
  $seen{$file->id}=1;
  if($file->name eq "cstdlib"){
    return 1;
  }
  my @refs = $file->refs("include","file",1);
  foreach my $ref (@refs){
    return 1 if includeCheck($ref->ent);
  }
}