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package Carp;
# This package implements handy routines for modules that wish to throw
# exceptions outside of the current package.
$CarpLevel = 0; # How many extra package levels to skip on carp.
require Exporter;
@ISA = Exporter;
@EXPORT = qw(confess croak carp);
sub longmess {
my $error = shift;
my $mess = "";
my $i = 1 + $CarpLevel;
my ($pack,$file,$line,$sub);
while (($pack,$file,$line,$sub) = caller($i++)) {
$mess .= "\t$sub " if $error eq "called";
$mess .= "$error at $file line $line\n";
$error = "called";
}
$mess || $error;
}
sub shortmess { # Short-circuit &longmess if called via multiple packages
my $error = $_[0]; # Instead of "shift"
my ($curpack) = caller(1);
my $extra = $CarpLevel;
my $i = 2;
my ($pack,$file,$line,$sub);
while (($pack,$file,$line,$sub) = caller($i++)) {
if ($pack ne $curpack) {
if ($extra-- > 0) {
$curpack = $pack;
}
else {
return "$error at $file line $line\n";
}
}
}
goto &longmess;
}
sub confess { die longmess @_; }
sub croak { die shortmess @_; }
sub carp { warn shortmess @_; }
1;
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