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

package DB;

$header = '$Header: perldb.pl,v 4.0 91/03/20 01:25:50 lwall Locked $';
#
# 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  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 = '';

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

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