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

package DB;

$header = '$Header: perldb.pl,v 3.0.1.2 90/03/12 16:39:39 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 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");		# so we don't dingle stdin
open(OUT,">/dev/tty");	# so we don't dongle stdout
select(OUT);
$| = 1;				# for DB'OUT
select(STDOUT);
$| = 1;				# for real STDOUT

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

sub DB {
    local($. ,$@, $!, $[, $,, $/, $\);
    $[ = 0; $, = ""; $/ = "\n"; $\ = "";
    ($line) = @_;
    if ($stop[$line]) {
	if ($stop eq '1') {
	    $signal |= 1;
	}
	else {
	    package main;
	    $DB'signal |= eval $DB'stop[$DB'line];  print DB'OUT $@;
	    $DB'stop[$DB'line] =~ s/;9$//;
	}
    }
    if ($single || $trace || $signal) {
	print OUT "$sub($line):\t",$line[$line];
	for ($i = $line + 1; $i <= $max && $line[$i] == 0; ++$i) {
	    last if $line[$i] =~ /^\s*(}|#|\n)/;
	    print OUT "$sub($i):\t",$line[$i];
	}
    }
    if ($action[$line]) {
	package main;
	eval $DB'action[$DB'line];  print DB'OUT $@;
    }
    if ($single || $signal) {
	if ($pre) {
	    package main;
	    eval $DB'pre;  print DB'OUT $@;
	}
	print OUT $#stack . " levels deep in subroutine calls!\n"
	    if $single & 4;
	$start = $line;
	while ((print OUT "  DB<", $#hist+1, "> "), $cmd=<IN>) {
	    $single = 0;
	    $signal = 0;
	    $cmd eq '' && exit 0;
	    chop($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.
f		Finish 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.
/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 package	List all variables and values in package (default main).
< 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 \"package main; print DB'OUT expr\".
command		Execute as a perl statement.

";
		next; };
	    $cmd =~ /^t$/ && do {
		$trace = !$trace;
		print OUT "Trace = ".($trace?"on":"off")."\n";
		next; };
	    $cmd =~ /^S$/ && do {
		foreach $subname (sort(keys %sub)) {
		    if ($subname =~ /^main'(.*)/) {
			print OUT $1,"\n";
		    }
		    else {
			print OUT $subname,"\n";
		    }
		}
		next; };
	    $cmd =~ /^V$/ && do {
		$cmd = 'V main'; };
	    $cmd =~ /^V\s*(['A-Za-z_]['\w]*)$/ && do {
		$packname = $1;
		do 'dumpvar.pl' unless defined &main'dumpvar;
		if (defined &main'dumpvar) {
		    &main'dumpvar($packname);
		}
		else {
		    print DB'OUT "dumpvar.pl not available.\n";
		}
		next; };
	    $cmd =~ /^l\s*(['A-Za-z_]['\w]*)/ && do {
		$subname = $1;
		$subname = "main'" . $subname unless $subname =~ /'/;
		$subrange = $sub{$subname};
		if ($subrange) {
		    if (eval($subrange) < -$window) {
			$subrange =~ s/-.*/+/;
		    }
		    $cmd = "l $subrange";
		} else {
		    print OUT "Subroutine $1 not found.\n";
		    next;
		} };
	    $cmd =~ /^w\s*(\d*)$/ && 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); };
	    $cmd =~ /^l\s*(\d*)\+(\d*)$/ && do {
		$start = $1 if $1;
		$incr = $2;
		$incr = $window - 1 unless $incr;
		$cmd = 'l ' . $start . '-' . ($start + $incr); };
	    $cmd =~ /^l\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", $line[$i];
		    last if $signal;
		}
		$start = $i;	# remember in case they want more
		$start = $max if $start > $max;
		next; };
	    $cmd =~ /^D$/ && do {
		print OUT "Deleting all breakpoints...\n";
		for ($i = 1; $i <= $max ; $i++) {
		    $stop[$i] = 0;
		}
		next; };
	    $cmd =~ /^L$/ && do {
		for ($i = 1; $i <= $max; $i++) {
		    if ($stop[$i] || $action[$i]) {
			print OUT "$i:\t", $line[$i];
			print OUT "  break if (", $stop[$i], ")\n" 
			    if $stop[$i];
			print OUT "  action:  ", $action[$i], "\n" 
			    if $action[$i];
			last if $signal;
		    }
		}
		next; };
	    $cmd =~ /^b\s*(['A-Za-z_]['\w]*)\s*(.*)/ && do {
		$subname = $1;
		$subname = "main'" . $subname unless $subname =~ /'/;
		($i) = split(/-/, $sub{$subname});
		if ($i) {
		    ++$i while $line[$i] == 0 && $i < $#line;
		    $stop[$i] = $2 ? $2 : 1;
		} else {
		    print OUT "Subroutine $1 not found.\n";
		}
		next; };
	    $cmd =~ /^b\s*(\d*)\s*(.*)/ && do {
		$i = ($1?$1:$line);
		if ($line[$i] == 0) {
		    print OUT "Line $i not breakable.\n";
		} else {
		    $stop[$i] = $2 ? $2 : 1;
		}
		next; };
	    $cmd =~ /^d\s*(\d+)?/ && do {
		$i = ($1?$1:$line);
		$stop[$i] = '';
		next; };
	    $cmd =~ /^A$/ && do {
		for ($i = 1; $i <= $max ; $i++) {
		    $action[$i] = '';
		}
		next; };
	    $cmd =~ /^<\s*(.*)/ && do {
		$pre = do action($1);
		next; };
	    $cmd =~ /^>\s*(.*)/ && do {
		$post = do action($1);
		next; };
	    $cmd =~ /^a\s*(\d+)(\s+(.*))?/ && do {
		$i = $1;
		if ($line[$i] == 0) {
		    print OUT "Line $i may not have an action.\n";
		} else {
		    $action[$i] = do action($3);
		}
		next; };
	    $cmd =~ /^n$/ && do {
		$single = 2;
		$laststep = $cmd;
		last; };
	    $cmd =~ /^s$/ && do {
		$single = 1;
		$laststep = $cmd;
		last; };
	    $cmd =~ /^c\s*(\d*)\s*$/ && do {
		$i = $1;
		if ($i) {
		    if ($line[$i] == 0) {
		        print OUT "Line $i not breakable.\n";
			next;
		    }
		    $stop[$i] .= ";9";	# add one-time-only b.p.
		}
		for ($i=0; $i <= $#stack; ) {
		    $stack[$i++] &= ~1;
		}
		last; };
	    $cmd =~ /^f$/ && do {
		$stack[$#stack] |= 2;
		last; };
	    $cmd =~ /^T$/ && do {
		for ($i=0; $i <= $#sub; ) {
		    print OUT $sub[$i++], "\n";
		    last if $signal;
		}
	        next; };
	    $cmd =~ /^\/(.*)$/ && do {
		$inpat = $1;
		$inpat =~ s:([^\\])/$:$1:;
		if ($inpat ne "") {
		    eval '$inpat =~ m'."\n$inpat\n";	
		    if ($@ ne "") {
		    	print OUT "$@";
		    	next;
		    }
		    $pat = $inpat;
		}
		$end = $start;
		eval '
		for (;;) {
		    ++$start;
		    $start = 1 if ($start > $max);
		    last if ($start == $end);
		    if ($line[$start] =~ m'."\n$pat\n".'i) {
			print OUT "$start:\t", $line[$start], "\n";
			last;
		    }
		} ';
		print OUT "/$pat/: not found\n" if ($start == $end);
		next; };
	    $cmd =~ /^\?(.*)$/ && do {
		$inpat = $1;
		$inpat =~ s:([^\\])\?$:$1:;
		if ($inpat ne "") {
		    eval '$inpat =~ m'."\n$inpat\n";	
		    if ($@ ne "") {
		    	print OUT "$@";
		    	next;
		    }
		    $pat = $inpat;
		}
		$end = $start;
		eval '
		for (;;) {
		    --$start;
		    $start = $max if ($start <= 0);
		    last if ($start == $end);
		    if ($line[$start] =~ m'."\n$pat\n".'i) {
			print OUT "$start:\t", $line[$start], "\n";
			last;
		    }
		} ';
		print OUT "?$pat?: not found\n" if ($start == $end);
		next; };
	    $cmd =~ /^!+\s*(-)?(\d+)?$/ && do {
		pop(@hist) if length($cmd) > 1;
		$i = ($1?($#hist-($2?$2:1)):($2?$2:$#hist));
		$cmd = $hist[$i] . "\n";
		print OUT $cmd;
		redo; };
	    $cmd =~ /^!(.+)$/ && 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 = $hist[$i] . "\n";
		print OUT $cmd;
		redo; };
	    $cmd =~ /^H\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; };
	    $cmd =~ s/^p( .*)?$/print DB'OUT$1/;
	    {
		package main;
		eval $DB'cmd;
	    }
	    print OUT $@,"\n";
	}
	if ($post) {
	    package main;
	    eval $DB'post;  print DB'OUT $@;
	}
    }
}

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

sub catch {
    $signal = 1;
}

sub sub {
    push(@stack, $single);
    $single &= 1;
    $single |= 4 if $#stack == $deep;
    local(@args) = @_;
    for (@args) {
	if (/^StB\000/ && length($_) == length($_main{'_main'})) {
	    $_ = sprintf("%s",$_);
	}
	else {
	    s/'/\\'/g;
	    s/(.*)/'$1'/ unless /^-?[\d.]+$/;
	}
    }
    push(@sub, $sub . '(' . join(', ', @args) . ') from ' . $line);
    if (wantarray) {
	@i = &$sub;
	--$#sub;
	$single |= pop(@stack);
	@i;
    }
    else {
	$i = &$sub;
	--$#sub;
	$single |= pop(@stack);
	$i;
    }
}

$single = 1;			# so it stops on first executable statement
$max = $#line;
@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/(.*)/'$1'/ unless /^-?[\d.]+$/;
}
push(@sub, 'main(' . join(', ', @args) . ")" );
$sub = 'main';

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
79a0689e	3	$header = '$Header: perldb.pl,v 3.0.1.2 90/03/12 16:39:39 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 $
79a0689e	13	# Revision 3.0.1.2 90/03/12 16:39:39 lwall
	14	# patch13: perl -d didn't format stack traces of *foo right
	15	# patch13: perl -d wiped out scalar return values of subroutines
	16	#
03a14243	17	# Revision 3.0.1.1 89/10/26 23:14:02 lwall
	18	# patch1: RCS expanded an unintended $Header in lib/perldb.pl
	19	#
a687059c	20	# Revision 3.0 89/10/18 15:19:46 lwall
	21	# 3.0 baseline
	22	#
	23	# Revision 2.0 88/06/05 00:09:45 root
	24	# Baseline version 2.0.
	25	#
	26	#
	27
	28	open(IN,"/dev/tty"); # so we don't dingle stdin
	29	open(OUT,">/dev/tty"); # so we don't dongle stdout
	30	select(OUT);
	31	$\| = 1; # for DB'OUT
	32	select(STDOUT);
	33	$\| = 1; # for real STDOUT
	34
03a14243	35	$header =~ s/.Header: ([^,]+),v(\s+\S+\s+\S+).*$/$1$2/;
a687059c	36	print OUT "\nLoading DB from $header\n\n";
	37
	38	sub DB {
	39	local($. ,$@, $!, $[, $,, $/, $\);
	40	$[ = 0; $, = ""; $/ = "\n"; $\ = "";
	41	($line) = @_;
	42	if ($stop[$line]) {
	43	if ($stop eq '1') {
	44	$signal \|= 1;
	45	}
	46	else {
	47	package main;
	48	$DB'signal \|= eval $DB'stop[$DB'line]; print DB'OUT $@;
	49	$DB'stop[$DB'line] =~ s/;9$//;
	50	}
	51	}
	52	if ($single \|\| $trace \|\| $signal) {
	53	print OUT "$sub($line):\t",$line[$line];
	54	for ($i = $line + 1; $i <= $max && $line[$i] == 0; ++$i) {
	55	last if $line[$i] =~ /^\s*(}\|#\|\n)/;
	56	print OUT "$sub($i):\t",$line[$i];
	57	}
	58	}
	59	if ($action[$line]) {
	60	package main;
	61	eval $DB'action[$DB'line]; print DB'OUT $@;
	62	}
	63	if ($single \|\| $signal) {
	64	if ($pre) {
	65	package main;
	66	eval $DB'pre; print DB'OUT $@;
	67	}
	68	print OUT $#stack . " levels deep in subroutine calls!\n"
	69	if $single & 4;
	70	$start = $line;
	71	while ((print OUT " DB<", $#hist+1, "> "), $cmd=<IN>) {
	72	$single = 0;
	73	$signal = 0;
	74	$cmd eq '' && exit 0;
	75	chop($cmd);
	76	$cmd =~ /^q$/ && exit 0;
	77	$cmd =~ /^$/ && ($cmd = $laststep);
	78	push(@hist,$cmd) if length($cmd) > 1;
	79	($i) = split(/\s+/,$cmd);
	80	eval "\$cmd =~ $alias{$i}", print OUT $@ if $alias{$i};
	81	$cmd =~ /^h$/ && do {
	82	print OUT "
	83	T Stack trace.
	84	s Single step.
	85	n Next, steps over subroutine calls.
	86	f Finish current subroutine.
	87	c [line] Continue; optionally inserts a one-time-only breakpoint
	88	at the specified line.
	89	<CR> Repeat last n or s.
	90	l min+incr List incr+1 lines starting at min.
	91	l min-max List lines.
	92	l line List line;
	93	l List next window.
	94	- List previous window.
	95	w line List window around line.
	96	l subname List subroutine.
	97	/pattern/ Search forwards for pattern; final / is optional.
	98	?pattern? Search backwards for pattern.
	99	L List breakpoints and actions.
100	S List subroutine names.
101	t Toggle trace mode.
102	b [line] [condition]
103	Set breakpoint; line defaults to the current execution line;
104	condition breaks if it evaluates to true, defaults to \'1\'.
105	b subname [condition]
106	Set breakpoint at first line of subroutine.
107	d [line] Delete breakpoint.
108	D Delete all breakpoints.
109	a [line] command
110	Set an action to be done before the line is executed.
111	Sequence is: check for breakpoint, print line if necessary,
112	do action, prompt user if breakpoint or step, evaluate line.
113	A Delete all actions.
114	V package List all variables and values in package (default main).
115	< command Define command before prompt.
116	> command Define command after prompt.
117	! number Redo command (default previous command).
118	! -number Redo number\'th to last command.
119	H -number Display last number commands (default all).
120	q or ^D Quit.
121	p expr Same as \"package main; print DB'OUT expr\".
122	command Execute as a perl statement.
123
124	";
125	next; };
126	$cmd =~ /^t$/ && do {
127	$trace = !$trace;
128	print OUT "Trace = ".($trace?"on":"off")."\n";
129	next; };
130	$cmd =~ /^S$/ && do {
131	foreach $subname (sort(keys %sub)) {
132	if ($subname =~ /^main'(.*)/) {
133	print OUT $1,"\n";
134	}
135	else {
136	print OUT $subname,"\n";
137	}
138	}
139	next; };
140	$cmd =~ /^V$/ && do {
141	$cmd = 'V main'; };
142	$cmd =~ /^V\s(['A-Za-z_]['\w])$/ && do {
143	$packname = $1;
144	do 'dumpvar.pl' unless defined &main'dumpvar;
145	if (defined &main'dumpvar) {
146	&main'dumpvar($packname);
147	}
148	else {
149	print DB'OUT "dumpvar.pl not available.\n";
150	}
151	next; };
152	$cmd =~ /^l\s(['A-Za-z_]['\w])/ && do {
153	$subname = $1;
154	$subname = "main'" . $subname unless $subname =~ /'/;
155	$subrange = $sub{$subname};
156	if ($subrange) {
157	if (eval($subrange) < -$window) {
158	$subrange =~ s/-.*/+/;
159	}
160	$cmd = "l $subrange";
161	} else {
162	print OUT "Subroutine $1 not found.\n";
163	next;
164	} };
165	$cmd =~ /^w\s(\d)$/ && do {
166	$incr = $window - 1;
167	$start = $1 if $1;
168	$start -= $preview;
169	$cmd = 'l ' . $start . '-' . ($start + $incr); };
170	$cmd =~ /^-$/ && do {
171	$incr = $window - 1;
172	$cmd = 'l ' . ($start-$window*2) . '+'; };
173	$cmd =~ /^l$/ && do {
174	$incr = $window - 1;
175	$cmd = 'l ' . $start . '-' . ($start + $incr); };
176	$cmd =~ /^l\s(\d)\+(\d*)$/ && do {
177	$start = $1 if $1;
178	$incr = $2;
179	$incr = $window - 1 unless $incr;
180	$cmd = 'l ' . $start . '-' . ($start + $incr); };
181	$cmd =~ /^l\s*(([\d\$\.]+)([-,]([\d\$\.]+))?)?/ && do {
182	$end = (!$2) ? $max : ($4 ? $4 : $2);
183	$end = $max if $end > $max;
184	$i = $2;
185	$i = $line if $i eq '.';
186	$i = 1 if $i < 1;
187	for (; $i <= $end; $i++) {
188	print OUT "$i:\t", $line[$i];
189	last if $signal;
190	}
191	$start = $i; # remember in case they want more
192	$start = $max if $start > $max;
193	next; };
194	$cmd =~ /^D$/ && do {
195	print OUT "Deleting all breakpoints...\n";
196	for ($i = 1; $i <= $max ; $i++) {
197	$stop[$i] = 0;
198	}
199	next; };
200	$cmd =~ /^L$/ && do {
201	for ($i = 1; $i <= $max; $i++) {
202	if ($stop[$i] \|\| $action[$i]) {
203	print OUT "$i:\t", $line[$i];
204	print OUT " break if (", $stop[$i], ")\n"
205	if $stop[$i];
206	print OUT " action: ", $action[$i], "\n"
207	if $action[$i];
208	last if $signal;
209	}
210	}
211	next; };
212	$cmd =~ /^b\s(['A-Za-z_]['\w])\s(.)/ && do {
213	$subname = $1;
214	$subname = "main'" . $subname unless $subname =~ /'/;
215	($i) = split(/-/, $sub{$subname});
216	if ($i) {
217	++$i while $line[$i] == 0 && $i < $#line;
218	$stop[$i] = $2 ? $2 : 1;
219	} else {
220	print OUT "Subroutine $1 not found.\n";
221	}
222	next; };
223	$cmd =~ /^b\s(\d)\s(.)/ && do {
224	$i = ($1?$1:$line);
225	if ($line[$i] == 0) {
226	print OUT "Line $i not breakable.\n";
227	} else {
228	$stop[$i] = $2 ? $2 : 1;
229	}
230	next; };
231	$cmd =~ /^d\s*(\d+)?/ && do {
232	$i = ($1?$1:$line);
233	$stop[$i] = '';
234	next; };
235	$cmd =~ /^A$/ && do {
236	for ($i = 1; $i <= $max ; $i++) {
237	$action[$i] = '';
238	}
239	next; };
240	$cmd =~ /^<\s(.)/ && do {
241	$pre = do action($1);
242	next; };
243	$cmd =~ /^>\s(.)/ && do {
244	$post = do action($1);
245	next; };
246	$cmd =~ /^a\s(\d+)(\s+(.))?/ && do {
247	$i = $1;
248	if ($line[$i] == 0) {
249	print OUT "Line $i may not have an action.\n";
250	} else {
251	$action[$i] = do action($3);
252	}
253	next; };
254	$cmd =~ /^n$/ && do {
255	$single = 2;
256	$laststep = $cmd;
257	last; };
258	$cmd =~ /^s$/ && do {
259	$single = 1;
260	$laststep = $cmd;
261	last; };
262	$cmd =~ /^c\s(\d)\s*$/ && do {
263	$i = $1;
264	if ($i) {
265	if ($line[$i] == 0) {
266	print OUT "Line $i not breakable.\n";
267	next;
268	}
269	$stop[$i] .= ";9"; # add one-time-only b.p.
270	}
271	for ($i=0; $i <= $#stack; ) {
272	$stack[$i++] &= ~1;
273	}
274	last; };
275	$cmd =~ /^f$/ && do {
276	$stack[$#stack] \|= 2;
277	last; };
278	$cmd =~ /^T$/ && do {
279	for ($i=0; $i <= $#sub; ) {
280	print OUT $sub[$i++], "\n";
281	last if $signal;
282	}
283	next; };
284	$cmd =~ /^\/(.*)$/ && do {
285	$inpat = $1;
286	$inpat =~ s:([^\\])/$:$1:;
287	if ($inpat ne "") {
288	eval '$inpat =~ m'."\n$inpat\n";
289	if ($@ ne "") {
290	print OUT "$@";
291	next;
292	}
293	$pat = $inpat;
294	}
295	$end = $start;
296	eval '
297	for (;;) {
298	++$start;
299	$start = 1 if ($start > $max);
300	last if ($start == $end);
301	if ($line[$start] =~ m'."\n$pat\n".'i) {
302	print OUT "$start:\t", $line[$start], "\n";
303	last;
304	}
305	} ';
306	print OUT "/$pat/: not found\n" if ($start == $end);
307	next; };
308	$cmd =~ /^\?(.*)$/ && do {
309	$inpat = $1;
310	$inpat =~ s:([^\\])\?$:$1:;
311	if ($inpat ne "") {
312	eval '$inpat =~ m'."\n$inpat\n";
313	if ($@ ne "") {
314	print OUT "$@";
315	next;
316	}
317	$pat = $inpat;
318	}
319	$end = $start;
320	eval '
321	for (;;) {
322	--$start;
323	$start = $max if ($start <= 0);
324	last if ($start == $end);
325	if ($line[$start] =~ m'."\n$pat\n".'i) {
326	print OUT "$start:\t", $line[$start], "\n";
327	last;
328	}
329	} ';
330	print OUT "?$pat?: not found\n" if ($start == $end);
331	next; };
332	$cmd =~ /^!+\s*(-)?(\d+)?$/ && do {
333	pop(@hist) if length($cmd) > 1;
334	$i = ($1?($#hist-($2?$2:1)):($2?$2:$#hist));
335	$cmd = $hist[$i] . "\n";
336	print OUT $cmd;
337	redo; };
338	$cmd =~ /^!(.+)$/ && do {
339	$pat = "^$1";
340	pop(@hist) if length($cmd) > 1;
341	for ($i = $#hist; $i; --$i) {
342	last if $hist[$i] =~ $pat;
343	}
344	if (!$i) {
345	print OUT "No such command!\n\n";
346	next;
347	}
348	$cmd = $hist[$i] . "\n";
349	print OUT $cmd;
350	redo; };
351	$cmd =~ /^H\s*(-(\d+))?/ && do {
352	$end = $2?($#hist-$2):0;
353	$hist = 0 if $hist < 0;
354	for ($i=$#hist; $i>$end; $i--) {
355	print OUT "$i: ",$hist[$i],"\n"
356	unless $hist[$i] =~ /^.?$/;
357	};
358	next; };
359	$cmd =~ s/^p( .*)?$/print DB'OUT$1/;
360	{
361	package main;
362	eval $DB'cmd;
363	}
364	print OUT $@,"\n";
365	}
366	if ($post) {
367	package main;
368	eval $DB'post; print DB'OUT $@;
369	}
370	}
371	}
372
373	sub action {
374	local($action) = @_;
375	while ($action =~ s/\\$//) {
376	print OUT "+ ";
377	$action .= <IN>;
378	}
379	$action;
380	}
381
382	sub catch {
383	$signal = 1;
384	}
385
386	sub sub {
387	push(@stack, $single);
388	$single &= 1;
389	$single \|= 4 if $#stack == $deep;
390	local(@args) = @_;
391	for (@args) {
79a0689e	392	if (/^StB\000/ && length($_) == length($_main{'_main'})) {
a687059c	393	$_ = sprintf("%s",$_);
a687059c	394	}
	395	else {
	396	s/'/\\'/g;
	397	s/(.*)/'$1'/ unless /^-?[\d.]+$/;
	398	}
	399	}
	400	push(@sub, $sub . '(' . join(', ', @args) . ') from ' . $line);
	401	if (wantarray) {
	402	@i = &$sub;
79a0689e	403	--$#sub;
	404	$single \|= pop(@stack);
	405	@i;
a687059c	406	}
	407	else {
	408	$i = &$sub;
79a0689e	409	--$#sub;
	410	$single \|= pop(@stack);
	411	$i;
a687059c	412	}
a687059c	413	}
	414
	415	$single = 1; # so it stops on first executable statement
	416	$max = $#line;
	417	@hist = ('?');
	418	$SIG{'INT'} = "DB'catch";
	419	$deep = 100; # warning if stack gets this deep
	420	$window = 10;
	421	$preview = 3;
	422
	423	@stack = (0);
	424	@args = @ARGV;
	425	for (@args) {
	426	s/'/\\'/g;
	427	s/(.*)/'$1'/ unless /^-?[\d.]+$/;
	428	}
	429	push(@sub, 'main(' . join(', ', @args) . ")" );
	430	$sub = 'main';
	431
	432	if (-f '.perldb') {
	433	do './.perldb';
	434	}
	435	elsif (-f "$ENV{'LOGDIR'}/.perldb") {
	436	do "$ENV{'LOGDIR'}/.perldb";
	437	}
	438	elsif (-f "$ENV{'HOME'}/.perldb") {
	439	do "$ENV{'HOME'}/.perldb";
	440	}
	441
	442	1;