[p5sagit/p5-mst-13.2.git] / lib / perldb.pl

package DB;

# modified Perl debugger, to be run from Emacs in perldb-mode
# Ray Lischner (uunet!mntgfx!lisch) as of 5 Nov 1990
# Johan Vromans -- upgrade to 4.0 pl 10

$header = '$RCSfile: perldb.pl,v $$Revision: 4.0.1.2 $$Date: 91/11/05 17:55:58 $';
#
# This file is automatically included if you do perl -d.
# It's probably not useful to include this yourself.
#
# Perl supplies the values for @line and %sub.  It effectively inserts
# a do DB'DB(<linenum>); in front of every place that can
# have a breakpoint.  It also inserts a do 'perldb.pl' before the first line.
#
# $Log:	perldb.pl,v $
# Revision 4.0.1.2  91/11/05  17:55:58  lwall
# patch11: perldb.pl modified to run within emacs in perldb-mode
# 
# Revision 4.0.1.1  91/06/07  11:17:44  lwall
# patch4: added $^P variable to control calling of perldb routines
# patch4: debugger sometimes listed wrong number of lines for a statement
# 
# Revision 4.0  91/03/20  01:25:50  lwall
# 4.0 baseline.
# 
# Revision 3.0.1.6  91/01/11  18:08:58  lwall
# patch42: @_ couldn't be accessed from debugger
# 
# Revision 3.0.1.5  90/11/10  01:40:26  lwall
# patch38: the debugger wouldn't stop correctly or do action routines
# 
# Revision 3.0.1.4  90/10/15  17:40:38  lwall
# patch29: added caller
# patch29: the debugger now understands packages and evals
# patch29: scripts now run at almost full speed under the debugger
# patch29: more variables are settable from debugger
# 
# Revision 3.0.1.3  90/08/09  04:00:58  lwall
# patch19: debugger now allows continuation lines
# patch19: debugger can now dump lists of variables
# patch19: debugger can now add aliases easily from prompt
# 
# Revision 3.0.1.2  90/03/12  16:39:39  lwall
# patch13: perl -d didn't format stack traces of *foo right
# patch13: perl -d wiped out scalar return values of subroutines
# 
# Revision 3.0.1.1  89/10/26  23:14:02  lwall
# patch1: RCS expanded an unintended $Header in lib/perldb.pl
# 
# Revision 3.0  89/10/18  15:19:46  lwall
# 3.0 baseline
# 
# Revision 2.0  88/06/05  00:09:45  root
# Baseline version 2.0.
# 
#

open(IN, "</dev/tty") || open(IN,  "<&STDIN");	# so we don't dingle stdin
open(OUT,">/dev/tty") || open(OUT, ">&STDOUT");	# so we don't dongle stdout
select(OUT);
$| = 1;				# for DB'OUT
select(STDOUT);
$| = 1;				# for real STDOUT
$sub = '';

# Is Perl being run from Emacs?
$emacs = $main'ARGV[$[] eq '-emacs';
shift(@main'ARGV) if $emacs;

$header =~ s/.Header: ([^,]+),v(\s+\S+\s+\S+).*$/$1$2/;
print OUT "\nLoading DB routines from $header\n";
print OUT ("Emacs support ",
	   $emacs ? "enabled" : "available",
	   ".\n");
print OUT "\nEnter h for help.\n\n";

sub DB {
    &save;
    ($package, $filename, $line) = caller;
    $usercontext = '($@, $!, $[, $,, $/, $\) = @saved;' .
	"package $package;";		# this won't let them modify, alas
    local($^P) = 0;			# don't debug our own evals
    local(*dbline) = "_<$filename";
    $max = $#dbline;
    if (($stop,$action) = split(/\0/,$dbline{$line})) {
	if ($stop eq '1') {
	    $signal |= 1;
	}
	else {
	    $evalarg = "\$DB'signal |= do {$stop;}"; &eval;
	    $dbline{$line} =~ s/;9($|\0)/$1/;
	}
    }
    if ($single || $trace || $signal) {
	if ($emacs) {
	    print OUT "\032\032$filename:$line:0\n";
	} else {
	    print OUT "$package'" unless $sub =~ /'/;
	    print OUT "$sub($filename:$line):\t",$dbline[$line];
	    for ($i = $line + 1; $i <= $max && $dbline[$i] == 0; ++$i) {
		last if $dbline[$i] =~ /^\s*(}|#|\n)/;
		print OUT "$sub($filename:$i):\t",$dbline[$i];
	    }
	}
    }
    $evalarg = $action, &eval if $action;
    if ($single || $signal) {
	$evalarg = $pre, &eval if $pre;
	print OUT $#stack . " levels deep in subroutine calls!\n"
	    if $single & 4;
	$start = $line;
      CMD:
	while ((print OUT "  DB<", $#hist+1, "> "), $cmd=&gets) {
	    {
		$single = 0;
		$signal = 0;
		$cmd eq '' && exit 0;
		chop($cmd);
		$cmd =~ s/\\$// && do {
		    print OUT "  cont: ";
		    $cmd .= &gets;
		    redo CMD;
		};
		$cmd =~ /^q$/ && exit 0;
		$cmd =~ /^$/ && ($cmd = $laststep);
		push(@hist,$cmd) if length($cmd) > 1;
		($i) = split(/\s+/,$cmd);
		eval "\$cmd =~ $alias{$i}", print OUT $@ if $alias{$i};
		$cmd =~ /^h$/ && do {
		    print OUT "
T		Stack trace.
s		Single step.
n		Next, steps over subroutine calls.
r		Return from current subroutine.
c [line]	Continue; optionally inserts a one-time-only breakpoint 
		at the specified line.
<CR>		Repeat last n or s.
l min+incr	List incr+1 lines starting at min.
l min-max	List lines.
l line		List line;
l		List next window.
-		List previous window.
w line		List window around line.
l subname	List subroutine.
f filename	Switch to filename.
/pattern/	Search forwards for pattern; final / is optional.
?pattern?	Search backwards for pattern.
L		List breakpoints and actions.
S		List subroutine names.
t		Toggle trace mode.
b [line] [condition]
		Set breakpoint; line defaults to the current execution line; 
		condition breaks if it evaluates to true, defaults to \'1\'.
b subname [condition]
		Set breakpoint at first line of subroutine.
d [line]	Delete breakpoint.
D		Delete all breakpoints.
a [line] command
		Set an action to be done before the line is executed.
		Sequence is: check for breakpoint, print line if necessary,
		do action, prompt user if breakpoint or step, evaluate line.
A		Delete all actions.
V [pkg [vars]]	List some (default all) variables in package (default current).
X [vars]	Same as \"V currentpackage [vars]\".
< command	Define command before prompt.
> command	Define command after prompt.
! number	Redo command (default previous command).
! -number	Redo number\'th to last command.
H -number	Display last number commands (default all).
q or ^D		Quit.
p expr		Same as \"print DB'OUT expr\" in current package.
= [alias value]	Define a command alias, or list current aliases.
command		Execute as a perl statement in current package.

";
		    next CMD; };
		$cmd =~ /^t$/ && do {
		    $trace = !$trace;
		    print OUT "Trace = ".($trace?"on":"off")."\n";
		    next CMD; };
		$cmd =~ /^S$/ && do {
		    foreach $subname (sort(keys %sub)) {
			print OUT $subname,"\n";
		    }
		    next CMD; };
		$cmd =~ s/^X\b/V $package/;
		$cmd =~ /^V$/ && do {
		    $cmd = 'V $package'; };
		$cmd =~ /^V\b\s*(\S+)\s*(.*)/ && do {
		    $packname = $1;
		    @vars = split(' ',$2);
		    do 'dumpvar.pl' unless defined &main'dumpvar;
		    if (defined &main'dumpvar) {
			&main'dumpvar($packname,@vars);
		    }
		    else {
			print DB'OUT "dumpvar.pl not available.\n";
		    }
		    next CMD; };
		$cmd =~ /^f\b\s*(.*)/ && do {
		    $file = $1;
		    if (!$file) {
			print OUT "The old f command is now the r command.\n";
			print OUT "The new f command switches filenames.\n";
			next CMD;
		    }
		    if (!defined $_main{'_<' . $file}) {
			if (($try) = grep(m#^_<.*$file#, keys %_main)) {
			    $file = substr($try,2);
			    print "\n$file:\n";
			}
		    }
		    if (!defined $_main{'_<' . $file}) {
			print OUT "There's no code here anything matching $file.\n";
			next CMD;
		    }
		    elsif ($file ne $filename) {
			*dbline = "_<$file";
			$max = $#dbline;
			$filename = $file;
			$start = 1;
			$cmd = "l";
		    } };
		$cmd =~ /^l\b\s*(['A-Za-z_]['\w]*)/ && do {
		    $subname = $1;
		    $subname = "main'" . $subname unless $subname =~ /'/;
		    $subname = "main" . $subname if substr($subname,0,1) eq "'";
		    ($file,$subrange) = split(/:/,$sub{$subname});
		    if ($file ne $filename) {
			*dbline = "_<$file";
			$max = $#dbline;
			$filename = $file;
		    }
		    if ($subrange) {
			if (eval($subrange) < -$window) {
			    $subrange =~ s/-.*/+/;
			}
			$cmd = "l $subrange";
		    } else {
			print OUT "Subroutine $1 not found.\n";
			next CMD;
		    } };
		$cmd =~ /^w\b\s*(\d*)$/ && do {
		    $incr = $window - 1;
		    $start = $1 if $1;
		    $start -= $preview;
		    $cmd = 'l ' . $start . '-' . ($start + $incr); };
		$cmd =~ /^-$/ && do {
		    $incr = $window - 1;
		    $cmd = 'l ' . ($start-$window*2) . '+'; };
		$cmd =~ /^l$/ && do {
		    $incr = $window - 1;
		    $cmd = 'l ' . $start . '-' . ($start + $incr); };
		$cmd =~ /^l\b\s*(\d*)\+(\d*)$/ && do {
		    $start = $1 if $1;
		    $incr = $2;
		    $incr = $window - 1 unless $incr;
		    $cmd = 'l ' . $start . '-' . ($start + $incr); };
		$cmd =~ /^l\b\s*(([\d\$\.]+)([-,]([\d\$\.]+))?)?/ && do {
		    $end = (!$2) ? $max : ($4 ? $4 : $2);
		    $end = $max if $end > $max;
		    $i = $2;
		    $i = $line if $i eq '.';
		    $i = 1 if $i < 1;
		    if ($emacs) {
			print OUT "\032\032$filename:$i:0\n";
			$i = $end;
		    } else {
			for (; $i <= $end; $i++) {
			    print OUT "$i:\t", $dbline[$i];
			    last if $signal;
			}
		    }
		    $start = $i;	# remember in case they want more
		    $start = $max if $start > $max;
		    next CMD; };
		$cmd =~ /^D$/ && do {
		    print OUT "Deleting all breakpoints...\n";
		    for ($i = 1; $i <= $max ; $i++) {
			if (defined $dbline{$i}) {
			    $dbline{$i} =~ s/^[^\0]+//;
			    if ($dbline{$i} =~ s/^\0?$//) {
				delete $dbline{$i};
			    }
			}
		    }
		    next CMD; };
		$cmd =~ /^L$/ && do {
		    for ($i = 1; $i <= $max; $i++) {
			if (defined $dbline{$i}) {
			    print OUT "$i:\t", $dbline[$i];
			    ($stop,$action) = split(/\0/, $dbline{$i});
			    print OUT "  break if (", $stop, ")\n" 
				if $stop;
			    print OUT "  action:  ", $action, "\n" 
				if $action;
			    last if $signal;
			}
		    }
		    next CMD; };
		$cmd =~ /^b\b\s*(['A-Za-z_]['\w]*)\s*(.*)/ && do {
		    $subname = $1;
		    $cond = $2 || '1';
		    $subname = "$package'" . $subname unless $subname =~ /'/;
		    $subname = "main" . $subname if substr($subname,0,1) eq "'";
		    ($filename,$i) = split(/[:-]/, $sub{$subname});
		    if ($i) {
			*dbline = "_<$filename";
			++$i while $dbline[$i] == 0 && $i < $#dbline;
			$dbline{$i} =~ s/^[^\0]*/$cond/;
		    } else {
			print OUT "Subroutine $subname not found.\n";
		    }
		    next CMD; };
		$cmd =~ /^b\b\s*(\d*)\s*(.*)/ && do {
		    $i = ($1?$1:$line);
		    $cond = $2 || '1';
		    if ($dbline[$i] == 0) {
			print OUT "Line $i not breakable.\n";
		    } else {
			$dbline{$i} =~ s/^[^\0]*/$cond/;
		    }
		    next CMD; };
		$cmd =~ /^d\b\s*(\d+)?/ && do {
		    $i = ($1?$1:$line);
		    $dbline{$i} =~ s/^[^\0]*//;
		    delete $dbline{$i} if $dbline{$i} eq '';
		    next CMD; };
		$cmd =~ /^A$/ && do {
		    for ($i = 1; $i <= $max ; $i++) {
			if (defined $dbline{$i}) {
			    $dbline{$i} =~ s/\0[^\0]*//;
			    delete $dbline{$i} if $dbline{$i} eq '';
			}
		    }
		    next CMD; };
		$cmd =~ /^<\s*(.*)/ && do {
		    $pre = do action($1);
		    next CMD; };
		$cmd =~ /^>\s*(.*)/ && do {
		    $post = do action($1);
		    next CMD; };
		$cmd =~ /^a\b\s*(\d+)(\s+(.*))?/ && do {
		    $i = $1;
		    if ($dbline[$i] == 0) {
			print OUT "Line $i may not have an action.\n";
		    } else {
			$dbline{$i} =~ s/\0[^\0]*//;
			$dbline{$i} .= "\0" . do action($3);
		    }
		    next CMD; };
		$cmd =~ /^n$/ && do {
		    $single = 2;
		    $laststep = $cmd;
		    last CMD; };
		$cmd =~ /^s$/ && do {
		    $single = 1;
		    $laststep = $cmd;
		    last CMD; };
		$cmd =~ /^c\b\s*(\d*)\s*$/ && do {
		    $i = $1;
		    if ($i) {
			if ($dbline[$i] == 0) {
			    print OUT "Line $i not breakable.\n";
			    next CMD;
			}
			$dbline{$i} =~ s/(\0|$)/;9$1/;	# add one-time-only b.p.
		    }
		    for ($i=0; $i <= $#stack; ) {
			$stack[$i++] &= ~1;
		    }
		    last CMD; };
		$cmd =~ /^r$/ && do {
		    $stack[$#stack] |= 2;
		    last CMD; };
		$cmd =~ /^T$/ && do {
		    local($p,$f,$l,$s,$h,$a,@a,@sub);
		    for ($i = 1; ($p,$f,$l,$s,$h,$w) = caller($i); $i++) {
			@a = @args;
			for (@a) {
			    if (/^StB\000/ && length($_) == length($_main{'_main'})) {
				$_ = sprintf("%s",$_);
			    }
			    else {
				s/'/\\'/g;
				s/([^\0]*)/'$1'/ unless /^-?[\d.]+$/;
				s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg;
				s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg;
			    }
			}
			$w = $w ? '@ = ' : '$ = ';
			$a = $h ? '(' . join(', ', @a) . ')' : '';
			push(@sub, "$w&$s$a from file $f line $l\n");
			last if $signal;
		    }
		    for ($i=0; $i <= $#sub; $i++) {
			last if $signal;
			print OUT $sub[$i];
		    }
		    next CMD; };
		$cmd =~ /^\/(.*)$/ && do {
		    $inpat = $1;
		    $inpat =~ s:([^\\])/$:$1:;
		    if ($inpat ne "") {
			eval '$inpat =~ m'."\n$inpat\n";	
			if ($@ ne "") {
			    print OUT "$@";
			    next CMD;
			}
			$pat = $inpat;
		    }
		    $end = $start;
		    eval '
		    for (;;) {
			++$start;
			$start = 1 if ($start > $max);
			last if ($start == $end);
			if ($dbline[$start] =~ m'."\n$pat\n".'i) {
			    if ($emacs) {
				print OUT "\032\032$filename:$start:0\n";
			    } else {
				print OUT "$start:\t", $dbline[$start], "\n";
			    }
			    last;
			}
		    } ';
		    print OUT "/$pat/: not found\n" if ($start == $end);
		    next CMD; };
		$cmd =~ /^\?(.*)$/ && do {
		    $inpat = $1;
		    $inpat =~ s:([^\\])\?$:$1:;
		    if ($inpat ne "") {
			eval '$inpat =~ m'."\n$inpat\n";	
			if ($@ ne "") {
			    print OUT "$@";
			    next CMD;
			}
			$pat = $inpat;
		    }
		    $end = $start;
		    eval '
		    for (;;) {
			--$start;
			$start = $max if ($start <= 0);
			last if ($start == $end);
			if ($dbline[$start] =~ m'."\n$pat\n".'i) {
			    if ($emacs) {
				print OUT "\032\032$filename:$start:0\n";
			    } else {
				print OUT "$start:\t", $dbline[$start], "\n";
			    }
			    last;
			}
		    } ';
		    print OUT "?$pat?: not found\n" if ($start == $end);
		    next CMD; };
		$cmd =~ /^!+\s*(-)?(\d+)?$/ && do {
		    pop(@hist) if length($cmd) > 1;
		    $i = ($1?($#hist-($2?$2:1)):($2?$2:$#hist));
		    $cmd = $hist[$i] . "\n";
		    print OUT $cmd;
		    redo CMD; };
		$cmd =~ /^!(.+)$/ && do {
		    $pat = "^$1";
		    pop(@hist) if length($cmd) > 1;
		    for ($i = $#hist; $i; --$i) {
			last if $hist[$i] =~ $pat;
		    }
		    if (!$i) {
			print OUT "No such command!\n\n";
			next CMD;
		    }
		    $cmd = $hist[$i] . "\n";
		    print OUT $cmd;
		    redo CMD; };
		$cmd =~ /^H\b\s*(-(\d+))?/ && do {
		    $end = $2?($#hist-$2):0;
		    $hist = 0 if $hist < 0;
		    for ($i=$#hist; $i>$end; $i--) {
			print OUT "$i: ",$hist[$i],"\n"
			    unless $hist[$i] =~ /^.?$/;
		    };
		    next CMD; };
		$cmd =~ s/^p( .*)?$/print DB'OUT$1/;
		$cmd =~ /^=/ && do {
		    if (local($k,$v) = ($cmd =~ /^=\s*(\S+)\s+(.*)/)) {
			$alias{$k}="s~$k~$v~";
			print OUT "$k = $v\n";
		    } elsif ($cmd =~ /^=\s*$/) {
			foreach $k (sort keys(%alias)) {
			    if (($v = $alias{$k}) =~ s~^s\~$k\~(.*)\~$~$1~) {
				print OUT "$k = $v\n";
			    } else {
				print OUT "$k\t$alias{$k}\n";
			    };
			};
		    };
		    next CMD; };
	    }
	    $evalarg = $cmd; &eval;
	    print OUT "\n";
	}
	if ($post) {
	    $evalarg = $post; &eval;
	}
    }
    ($@, $!, $[, $,, $/, $\) = @saved;
}

sub save {
    @saved = ($@, $!, $[, $,, $/, $\);
    $[ = 0; $, = ""; $/ = "\n"; $\ = "";
}

# The following takes its argument via $evalarg to preserve current @_

sub eval {
    eval "$usercontext $evalarg; &DB'save";
    print OUT $@;
}

sub action {
    local($action) = @_;
    while ($action =~ s/\\$//) {
	print OUT "+ ";
	$action .= &gets;
    }
    $action;
}

sub gets {
    local($.);
    <IN>;
}

sub catch {
    $signal = 1;
}

sub sub {
    push(@stack, $single);
    $single &= 1;
    $single |= 4 if $#stack == $deep;
    if (wantarray) {
	@i = &$sub;
	$single |= pop(@stack);
	@i;
    }
    else {
	$i = &$sub;
	$single |= pop(@stack);
	$i;
    }
}

$single = 1;			# so it stops on first executable statement
@hist = ('?');
$SIG{'INT'} = "DB'catch";
$deep = 100;		# warning if stack gets this deep
$window = 10;
$preview = 3;

@stack = (0);
@ARGS = @ARGV;
for (@args) {
    s/'/\\'/g;
    s/(.*)/'$1'/ unless /^-?[\d.]+$/;
}

if (-f '.perldb') {
    do './.perldb';
}
elsif (-f "$ENV{'LOGDIR'}/.perldb") {
    do "$ENV{'LOGDIR'}/.perldb";
}
elsif (-f "$ENV{'HOME'}/.perldb") {
    do "$ENV{'HOME'}/.perldb";
}

1;
Commit	Line	Data
a687059c	1	package DB;
a687059c	2
f0fcb552	3	# modified Perl debugger, to be run from Emacs in perldb-mode
	4	# Ray Lischner (uunet!mntgfx!lisch) as of 5 Nov 1990
	5	# Johan Vromans -- upgrade to 4.0 pl 10
	6
	7	$header = '$RCSfile: perldb.pl,v $$Revision: 4.0.1.2 $$Date: 91/11/05 17:55:58 $';
a687059c	8	#
	9	# This file is automatically included if you do perl -d.
	10	# It's probably not useful to include this yourself.
	11	#
	12	# Perl supplies the values for @line and %sub. It effectively inserts
	13	# a do DB'DB(<linenum>); in front of every place that can
	14	# have a breakpoint. It also inserts a do 'perldb.pl' before the first line.
	15	#
	16	# $Log: perldb.pl,v $
f0fcb552	17	# Revision 4.0.1.2 91/11/05 17:55:58 lwall
	18	# patch11: perldb.pl modified to run within emacs in perldb-mode
	19	#
9ef589d8	20	# Revision 4.0.1.1 91/06/07 11:17:44 lwall
	21	# patch4: added $^P variable to control calling of perldb routines
	22	# patch4: debugger sometimes listed wrong number of lines for a statement
	23	#
fe14fcc3	24	# Revision 4.0 91/03/20 01:25:50 lwall
	25	# 4.0 baseline.
	26	#
27e2fb84	27	# Revision 3.0.1.6 91/01/11 18:08:58 lwall
	28	# patch42: @_ couldn't be accessed from debugger
	29	#
34de22dd	30	# Revision 3.0.1.5 90/11/10 01:40:26 lwall
	31	# patch38: the debugger wouldn't stop correctly or do action routines
	32	#
76854fea	33	# Revision 3.0.1.4 90/10/15 17:40:38 lwall
	34	# patch29: added caller
	35	# patch29: the debugger now understands packages and evals
	36	# patch29: scripts now run at almost full speed under the debugger
	37	# patch29: more variables are settable from debugger
	38	#
33b78306	39	# Revision 3.0.1.3 90/08/09 04:00:58 lwall
	40	# patch19: debugger now allows continuation lines
	41	# patch19: debugger can now dump lists of variables
	42	# patch19: debugger can now add aliases easily from prompt
	43	#
79a0689e	44	# Revision 3.0.1.2 90/03/12 16:39:39 lwall
	45	# patch13: perl -d didn't format stack traces of *foo right
	46	# patch13: perl -d wiped out scalar return values of subroutines
	47	#
03a14243	48	# Revision 3.0.1.1 89/10/26 23:14:02 lwall
	49	# patch1: RCS expanded an unintended $Header in lib/perldb.pl
	50	#
a687059c	51	# Revision 3.0 89/10/18 15:19:46 lwall
	52	# 3.0 baseline
	53	#
	54	# Revision 2.0 88/06/05 00:09:45 root
	55	# Baseline version 2.0.
	56	#
	57	#
	58
76854fea	59	open(IN, "</dev/tty") \|\| open(IN, "<&STDIN"); # so we don't dingle stdin
76854fea	60	open(OUT,">/dev/tty") \|\| open(OUT, ">&STDOUT"); # so we don't dongle stdout
a687059c	61	select(OUT);
	62	$\| = 1; # for DB'OUT
	63	select(STDOUT);
	64	$\| = 1; # for real STDOUT
76854fea	65	$sub = '';
a687059c	66
f0fcb552	67	# Is Perl being run from Emacs?
	68	$emacs = $main'ARGV[$[] eq '-emacs';
	69	shift(@main'ARGV) if $emacs;
	70
03a14243	71	$header =~ s/.Header: ([^,]+),v(\s+\S+\s+\S+).*$/$1$2/;
f0fcb552	72	print OUT "\nLoading DB routines from $header\n";
	73	print OUT ("Emacs support ",
	74	$emacs ? "enabled" : "available",
	75	".\n");
	76	print OUT "\nEnter h for help.\n\n";
a687059c	77
a687059c	78	sub DB {
76854fea	79	&save;
	80	($package, $filename, $line) = caller;
	81	$usercontext = '($@, $!, $[, $,, $/, $\) = @saved;' .
	82	"package $package;"; # this won't let them modify, alas
9ef589d8	83	local($^P) = 0; # don't debug our own evals
76854fea	84	local(*dbline) = "_<$filename";
	85	$max = $#dbline;
	86	if (($stop,$action) = split(/\0/,$dbline{$line})) {
a687059c	87	if ($stop eq '1') {
	88	$signal \|= 1;
	89	}
	90	else {
27e2fb84	91	$evalarg = "\$DB'signal \|= do {$stop;}"; &eval;
76854fea	92	$dbline{$line} =~ s/;9($\|\0)/$1/;
a687059c	93	}
	94	}
	95	if ($single \|\| $trace \|\| $signal) {
f0fcb552	96	if ($emacs) {
	97	print OUT "\032\032$filename:$line:0\n";
	98	} else {
	99	print OUT "$package'" unless $sub =~ /'/;
	100	print OUT "$sub($filename:$line):\t",$dbline[$line];
	101	for ($i = $line + 1; $i <= $max && $dbline[$i] == 0; ++$i) {
	102	last if $dbline[$i] =~ /^\s*(}\|#\|\n)/;
	103	print OUT "$sub($filename:$i):\t",$dbline[$i];
	104	}
a687059c	105	}
a687059c	106	}
27e2fb84	107	$evalarg = $action, &eval if $action;
a687059c	108	if ($single \|\| $signal) {
27e2fb84	109	$evalarg = $pre, &eval if $pre;
a687059c	110	print OUT $#stack . " levels deep in subroutine calls!\n"
	111	if $single & 4;
	112	$start = $line;
fe14fcc3	113	CMD:
76854fea	114	while ((print OUT " DB<", $#hist+1, "> "), $cmd=&gets) {
fe14fcc3	115	{
	116	$single = 0;
	117	$signal = 0;
	118	$cmd eq '' && exit 0;
	119	chop($cmd);
	120	$cmd =~ s/\\$// && do {
	121	print OUT " cont: ";
	122	$cmd .= &gets;
	123	redo CMD;
	124	};
	125	$cmd =~ /^q$/ && exit 0;
	126	$cmd =~ /^$/ && ($cmd = $laststep);
	127	push(@hist,$cmd) if length($cmd) > 1;
	128	($i) = split(/\s+/,$cmd);
	129	eval "\$cmd =~ $alias{$i}", print OUT $@ if $alias{$i};
	130	$cmd =~ /^h$/ && do {
	131	print OUT "
a687059c	132	T Stack trace.
	133	s Single step.
	134	n Next, steps over subroutine calls.
76854fea	135	r Return from current subroutine.
a687059c	136	c [line] Continue; optionally inserts a one-time-only breakpoint
	137	at the specified line.
	138	<CR> Repeat last n or s.
	139	l min+incr List incr+1 lines starting at min.
	140	l min-max List lines.
	141	l line List line;
	142	l List next window.
	143	- List previous window.
	144	w line List window around line.
	145	l subname List subroutine.
76854fea	146	f filename Switch to filename.
a687059c	147	/pattern/ Search forwards for pattern; final / is optional.
	148	?pattern? Search backwards for pattern.
	149	L List breakpoints and actions.
	150	S List subroutine names.
	151	t Toggle trace mode.
	152	b [line] [condition]
	153	Set breakpoint; line defaults to the current execution line;
	154	condition breaks if it evaluates to true, defaults to \'1\'.
	155	b subname [condition]
	156	Set breakpoint at first line of subroutine.
	157	d [line] Delete breakpoint.
	158	D Delete all breakpoints.
	159	a [line] command
	160	Set an action to be done before the line is executed.
	161	Sequence is: check for breakpoint, print line if necessary,
	162	do action, prompt user if breakpoint or step, evaluate line.
	163	A Delete all actions.
76854fea	164	V [pkg [vars]] List some (default all) variables in package (default current).
76854fea	165	X [vars] Same as \"V currentpackage [vars]\".
a687059c	166	< command Define command before prompt.
	167	> command Define command after prompt.
	168	! number Redo command (default previous command).
	169	! -number Redo number\'th to last command.
	170	H -number Display last number commands (default all).
	171	q or ^D Quit.
76854fea	172	p expr Same as \"print DB'OUT expr\" in current package.
33b78306	173	= [alias value] Define a command alias, or list current aliases.
76854fea	174	command Execute as a perl statement in current package.
a687059c	175
a687059c	176	";
fe14fcc3	177	next CMD; };
	178	$cmd =~ /^t$/ && do {
	179	$trace = !$trace;
	180	print OUT "Trace = ".($trace?"on":"off")."\n";
	181	next CMD; };
	182	$cmd =~ /^S$/ && do {
	183	foreach $subname (sort(keys %sub)) {
	184	print OUT $subname,"\n";
	185	}
	186	next CMD; };
	187	$cmd =~ s/^X\b/V $package/;
	188	$cmd =~ /^V$/ && do {
	189	$cmd = 'V $package'; };
	190	$cmd =~ /^V\b\s(\S+)\s(.*)/ && do {
	191	$packname = $1;
	192	@vars = split(' ',$2);
	193	do 'dumpvar.pl' unless defined &main'dumpvar;
	194	if (defined &main'dumpvar) {
	195	&main'dumpvar($packname,@vars);
	196	}
	197	else {
	198	print DB'OUT "dumpvar.pl not available.\n";
76854fea	199	}
fe14fcc3	200	next CMD; };
	201	$cmd =~ /^f\b\s(.)/ && do {
	202	$file = $1;
	203	if (!$file) {
	204	print OUT "The old f command is now the r command.\n";
	205	print OUT "The new f command switches filenames.\n";
	206	next CMD;
a687059c	207	}
fe14fcc3	208	if (!defined $_main{'_<' . $file}) {
	209	if (($try) = grep(m#^_<.*$file#, keys %_main)) {
	210	$file = substr($try,2);
	211	print "\n$file:\n";
76854fea	212	}
76854fea	213	}
fe14fcc3	214	if (!defined $_main{'_<' . $file}) {
	215	print OUT "There's no code here anything matching $file.\n";
	216	next CMD;
	217	}
	218	elsif ($file ne $filename) {
	219	*dbline = "_<$file";
	220	$max = $#dbline;
	221	$filename = $file;
	222	$start = 1;
	223	$cmd = "l";
	224	} };
	225	$cmd =~ /^l\b\s(['A-Za-z_]['\w])/ && do {
	226	$subname = $1;
	227	$subname = "main'" . $subname unless $subname =~ /'/;
	228	$subname = "main" . $subname if substr($subname,0,1) eq "'";
	229	($file,$subrange) = split(/:/,$sub{$subname});
	230	if ($file ne $filename) {
	231	*dbline = "_<$file";
	232	$max = $#dbline;
	233	$filename = $file;
	234	}
	235	if ($subrange) {
	236	if (eval($subrange) < -$window) {
	237	$subrange =~ s/-.*/+/;
	238	}
	239	$cmd = "l $subrange";
	240	} else {
	241	print OUT "Subroutine $1 not found.\n";
	242	next CMD;
	243	} };
	244	$cmd =~ /^w\b\s(\d)$/ && do {
	245	$incr = $window - 1;
	246	$start = $1 if $1;
	247	$start -= $preview;
	248	$cmd = 'l ' . $start . '-' . ($start + $incr); };
	249	$cmd =~ /^-$/ && do {
	250	$incr = $window - 1;
	251	$cmd = 'l ' . ($start-$window*2) . '+'; };
	252	$cmd =~ /^l$/ && do {
	253	$incr = $window - 1;
	254	$cmd = 'l ' . $start . '-' . ($start + $incr); };
	255	$cmd =~ /^l\b\s(\d)\+(\d*)$/ && do {
	256	$start = $1 if $1;
	257	$incr = $2;
	258	$incr = $window - 1 unless $incr;
	259	$cmd = 'l ' . $start . '-' . ($start + $incr); };
	260	$cmd =~ /^l\b\s*(([\d\$\.]+)([-,]([\d\$\.]+))?)?/ && do {
	261	$end = (!$2) ? $max : ($4 ? $4 : $2);
	262	$end = $max if $end > $max;
	263	$i = $2;
	264	$i = $line if $i eq '.';
	265	$i = 1 if $i < 1;
f0fcb552	266	if ($emacs) {
	267	print OUT "\032\032$filename:$i:0\n";
	268	$i = $end;
	269	} else {
	270	for (; $i <= $end; $i++) {
	271	print OUT "$i:\t", $dbline[$i];
	272	last if $signal;
	273	}
a687059c	274	}
fe14fcc3	275	$start = $i; # remember in case they want more
	276	$start = $max if $start > $max;
	277	next CMD; };
	278	$cmd =~ /^D$/ && do {
	279	print OUT "Deleting all breakpoints...\n";
	280	for ($i = 1; $i <= $max ; $i++) {
	281	if (defined $dbline{$i}) {
	282	$dbline{$i} =~ s/^[^\0]+//;
	283	if ($dbline{$i} =~ s/^\0?$//) {
	284	delete $dbline{$i};
	285	}
	286	}
	287	}
	288	next CMD; };
	289	$cmd =~ /^L$/ && do {
	290	for ($i = 1; $i <= $max; $i++) {
	291	if (defined $dbline{$i}) {
	292	print OUT "$i:\t", $dbline[$i];
	293	($stop,$action) = split(/\0/, $dbline{$i});
	294	print OUT " break if (", $stop, ")\n"
	295	if $stop;
	296	print OUT " action: ", $action, "\n"
	297	if $action;
	298	last if $signal;
	299	}
	300	}
	301	next CMD; };
	302	$cmd =~ /^b\b\s(['A-Za-z_]['\w])\s(.)/ && do {
	303	$subname = $1;
	304	$cond = $2 \|\| '1';
	305	$subname = "$package'" . $subname unless $subname =~ /'/;
	306	$subname = "main" . $subname if substr($subname,0,1) eq "'";
	307	($filename,$i) = split(/[:-]/, $sub{$subname});
	308	if ($i) {
	309	*dbline = "_<$filename";
	310	++$i while $dbline[$i] == 0 && $i < $#dbline;
	311	$dbline{$i} =~ s/^[^\0]*/$cond/;
	312	} else {
	313	print OUT "Subroutine $subname not found.\n";
76854fea	314	}
fe14fcc3	315	next CMD; };
	316	$cmd =~ /^b\b\s(\d)\s(.)/ && do {
	317	$i = ($1?$1:$line);
	318	$cond = $2 \|\| '1';
76854fea	319	if ($dbline[$i] == 0) {
fe14fcc3	320	print OUT "Line $i not breakable.\n";
	321	} else {
	322	$dbline{$i} =~ s/^[^\0]*/$cond/;
a687059c	323	}
fe14fcc3	324	next CMD; };
	325	$cmd =~ /^d\b\s*(\d+)?/ && do {
	326	$i = ($1?$1:$line);
	327	$dbline{$i} =~ s/^[^\0]*//;
	328	delete $dbline{$i} if $dbline{$i} eq '';
	329	next CMD; };
	330	$cmd =~ /^A$/ && do {
	331	for ($i = 1; $i <= $max ; $i++) {
	332	if (defined $dbline{$i}) {
	333	$dbline{$i} =~ s/\0[^\0]*//;
	334	delete $dbline{$i} if $dbline{$i} eq '';
76854fea	335	}
fe14fcc3	336	}
	337	next CMD; };
	338	$cmd =~ /^<\s(.)/ && do {
	339	$pre = do action($1);
	340	next CMD; };
	341	$cmd =~ /^>\s(.)/ && do {
	342	$post = do action($1);
	343	next CMD; };
	344	$cmd =~ /^a\b\s(\d+)(\s+(.))?/ && do {
	345	$i = $1;
	346	if ($dbline[$i] == 0) {
	347	print OUT "Line $i may not have an action.\n";
	348	} else {
	349	$dbline{$i} =~ s/\0[^\0]*//;
	350	$dbline{$i} .= "\0" . do action($3);
	351	}
	352	next CMD; };
	353	$cmd =~ /^n$/ && do {
	354	$single = 2;
	355	$laststep = $cmd;
	356	last CMD; };
	357	$cmd =~ /^s$/ && do {
	358	$single = 1;
	359	$laststep = $cmd;
	360	last CMD; };
	361	$cmd =~ /^c\b\s(\d)\s*$/ && do {
	362	$i = $1;
	363	if ($i) {
	364	if ($dbline[$i] == 0) {
	365	print OUT "Line $i not breakable.\n";
	366	next CMD;
76854fea	367	}
fe14fcc3	368	$dbline{$i} =~ s/(\0\|$)/;9$1/; # add one-time-only b.p.
76854fea	369	}
fe14fcc3	370	for ($i=0; $i <= $#stack; ) {
fe14fcc3	371	$stack[$i++] &= ~1;
a687059c	372	}
fe14fcc3	373	last CMD; };
	374	$cmd =~ /^r$/ && do {
	375	$stack[$#stack] \|= 2;
	376	last CMD; };
	377	$cmd =~ /^T$/ && do {
	378	local($p,$f,$l,$s,$h,$a,@a,@sub);
	379	for ($i = 1; ($p,$f,$l,$s,$h,$w) = caller($i); $i++) {
	380	@a = @args;
	381	for (@a) {
	382	if (/^StB\000/ && length($_) == length($_main{'_main'})) {
	383	$_ = sprintf("%s",$_);
	384	}
	385	else {
	386	s/'/\\'/g;
	387	s/([^\0]*)/'$1'/ unless /^-?[\d.]+$/;
	388	s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg;
	389	s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg;
	390	}
	391	}
	392	$w = $w ? '@ = ' : '$ = ';
	393	$a = $h ? '(' . join(', ', @a) . ')' : '';
	394	push(@sub, "$w&$s$a from file $f line $l\n");
	395	last if $signal;
a687059c	396	}
fe14fcc3	397	for ($i=0; $i <= $#sub; $i++) {
	398	last if $signal;
	399	print OUT $sub[$i];
a687059c	400	}
fe14fcc3	401	next CMD; };
	402	$cmd =~ /^\/(.*)$/ && do {
	403	$inpat = $1;
	404	$inpat =~ s:([^\\])/$:$1:;
	405	if ($inpat ne "") {
	406	eval '$inpat =~ m'."\n$inpat\n";
	407	if ($@ ne "") {
	408	print OUT "$@";
	409	next CMD;
	410	}
	411	$pat = $inpat;
a687059c	412	}
fe14fcc3	413	$end = $start;
	414	eval '
	415	for (;;) {
	416	++$start;
	417	$start = 1 if ($start > $max);
	418	last if ($start == $end);
	419	if ($dbline[$start] =~ m'."\n$pat\n".'i) {
f0fcb552	420	if ($emacs) {
	421	print OUT "\032\032$filename:$start:0\n";
	422	} else {
	423	print OUT "$start:\t", $dbline[$start], "\n";
	424	}
fe14fcc3	425	last;
	426	}
	427	} ';
	428	print OUT "/$pat/: not found\n" if ($start == $end);
	429	next CMD; };
	430	$cmd =~ /^\?(.*)$/ && do {
	431	$inpat = $1;
	432	$inpat =~ s:([^\\])\?$:$1:;
	433	if ($inpat ne "") {
	434	eval '$inpat =~ m'."\n$inpat\n";
	435	if ($@ ne "") {
	436	print OUT "$@";
	437	next CMD;
	438	}
	439	$pat = $inpat;
	440	}
	441	$end = $start;
	442	eval '
	443	for (;;) {
	444	--$start;
	445	$start = $max if ($start <= 0);
	446	last if ($start == $end);
	447	if ($dbline[$start] =~ m'."\n$pat\n".'i) {
f0fcb552	448	if ($emacs) {
	449	print OUT "\032\032$filename:$start:0\n";
	450	} else {
	451	print OUT "$start:\t", $dbline[$start], "\n";
	452	}
fe14fcc3	453	last;
	454	}
	455	} ';
	456	print OUT "?$pat?: not found\n" if ($start == $end);
	457	next CMD; };
	458	$cmd =~ /^!+\s*(-)?(\d+)?$/ && do {
	459	pop(@hist) if length($cmd) > 1;
	460	$i = ($1?($#hist-($2?$2:1)):($2?$2:$#hist));
	461	$cmd = $hist[$i] . "\n";
	462	print OUT $cmd;
	463	redo CMD; };
	464	$cmd =~ /^!(.+)$/ && do {
	465	$pat = "^$1";
	466	pop(@hist) if length($cmd) > 1;
	467	for ($i = $#hist; $i; --$i) {
	468	last if $hist[$i] =~ $pat;
	469	}
	470	if (!$i) {
	471	print OUT "No such command!\n\n";
	472	next CMD;
	473	}
	474	$cmd = $hist[$i] . "\n";
	475	print OUT $cmd;
	476	redo CMD; };
	477	$cmd =~ /^H\b\s*(-(\d+))?/ && do {
	478	$end = $2?($#hist-$2):0;
	479	$hist = 0 if $hist < 0;
	480	for ($i=$#hist; $i>$end; $i--) {
	481	print OUT "$i: ",$hist[$i],"\n"
	482	unless $hist[$i] =~ /^.?$/;
	483	};
	484	next CMD; };
	485	$cmd =~ s/^p( .*)?$/print DB'OUT$1/;
	486	$cmd =~ /^=/ && do {
	487	if (local($k,$v) = ($cmd =~ /^=\s(\S+)\s+(.)/)) {
	488	$alias{$k}="s~$k~$v~";
	489	print OUT "$k = $v\n";
	490	} elsif ($cmd =~ /^=\s*$/) {
	491	foreach $k (sort keys(%alias)) {
	492	if (($v = $alias{$k}) =~ s~^s\~$k\~(.*)\~$~$1~) {
	493	print OUT "$k = $v\n";
	494	} else {
	495	print OUT "$k\t$alias{$k}\n";
	496	};
33b78306	497	};
33b78306	498	};
fe14fcc3	499	next CMD; };
fe14fcc3	500	}
27e2fb84	501	$evalarg = $cmd; &eval;
76854fea	502	print OUT "\n";
a687059c	503	}
a687059c	504	if ($post) {
27e2fb84	505	$evalarg = $post; &eval;
a687059c	506	}
a687059c	507	}
76854fea	508	($@, $!, $[, $,, $/, $\) = @saved;
	509	}
	510
	511	sub save {
	512	@saved = ($@, $!, $[, $,, $/, $\);
	513	$[ = 0; $, = ""; $/ = "\n"; $\ = "";
	514	}
	515
27e2fb84	516	# The following takes its argument via $evalarg to preserve current @_
27e2fb84	517
76854fea	518	sub eval {
27e2fb84	519	eval "$usercontext $evalarg; &DB'save";
76854fea	520	print OUT $@;
a687059c	521	}
	522
	523	sub action {
	524	local($action) = @_;
	525	while ($action =~ s/\\$//) {
	526	print OUT "+ ";
76854fea	527	$action .= &gets;
a687059c	528	}
	529	$action;
	530	}
	531
76854fea	532	sub gets {
	533	local($.);
	534	<IN>;
	535	}
	536
a687059c	537	sub catch {
	538	$signal = 1;
	539	}
	540
	541	sub sub {
	542	push(@stack, $single);
	543	$single &= 1;
	544	$single \|= 4 if $#stack == $deep;
a687059c	545	if (wantarray) {
a687059c	546	@i = &$sub;
79a0689e	547	$single \|= pop(@stack);
79a0689e	548	@i;
a687059c	549	}
	550	else {
	551	$i = &$sub;
79a0689e	552	$single \|= pop(@stack);
79a0689e	553	$i;
a687059c	554	}
a687059c	555	}
	556
	557	$single = 1; # so it stops on first executable statement
a687059c	558	@hist = ('?');
	559	$SIG{'INT'} = "DB'catch";
	560	$deep = 100; # warning if stack gets this deep
	561	$window = 10;
	562	$preview = 3;
	563
	564	@stack = (0);
76854fea	565	@ARGS = @ARGV;
a687059c	566	for (@args) {
	567	s/'/\\'/g;
	568	s/(.*)/'$1'/ unless /^-?[\d.]+$/;
	569	}
a687059c	570
	571	if (-f '.perldb') {
	572	do './.perldb';
	573	}
	574	elsif (-f "$ENV{'LOGDIR'}/.perldb") {
	575	do "$ENV{'LOGDIR'}/.perldb";
	576	}
	577	elsif (-f "$ENV{'HOME'}/.perldb") {
	578	do "$ENV{'HOME'}/.perldb";
	579	}
	580
	581	1;