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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;
-