package DBICTest::Util;
use warnings;
use strict;
use Config;
use base 'Exporter';
our @EXPORT_OK = qw/local_umask stacktrace/;
sub local_umask {
  return unless defined $Config{d_umask};
  die 'Calling local_umask() in void context makes no sense'
    if ! defined wantarray;
  my $old_umask = umask(shift());
  die "Setting umask failed: $!" unless defined $old_umask;
  return bless \$old_umask, 'DBICTest::Util::UmaskGuard';
}
{
  package DBICTest::Util::UmaskGuard;
  sub DESTROY {
    local ($@, $!);
    eval { defined (umask ${$_[0]}) or die };
    warn ( "Unable to reset old umask ${$_[0]}: " . ($!||'Unknown error') )
      if ($@ || $!);
  }
}
sub stacktrace {
  my $frame = shift;
  $frame++;
  my (@stack, @frame);
  while (@frame = caller($frame++)) {
    push @stack, [@frame[3,1,2]];
  }
  return undef unless @stack;
  $stack[0][0] = '';
  return join "\tinvoked as ", map { sprintf ("%s at %s line %d\n", @$_ ) } @stack;
}
1;