Commit | Line | Data |
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870abcc9 S |
1 | # |
2 | # This library is no longer being maintained, and is included for backward | |
3 | # compatibility with Perl 4 programs which may require it. | |
4 | # This legacy library is deprecated and will be removed in a future | |
5 | # release of perl. | |
6 | # | |
f1ca563b LW |
7 | # assert.pl |
8 | # tchrist@convex.com (Tom Christiansen) | |
9 | # | |
10 | # Usage: | |
11 | # | |
12 | # &assert('@x > @y'); | |
13 | # &assert('$var > 10', $var, $othervar, @various_info); | |
14 | # | |
15 | # That is, if the first expression evals false, we blow up. The | |
16 | # rest of the args, if any, are nice to know because they will | |
17 | # be printed out by &panic, which is just the stack-backtrace | |
18 | # routine shamelessly borrowed from the perl debugger. | |
19 | ||
20 | sub assert { | |
859172fe | 21 | &panic("ASSERTION BOTCHED: $_[0]",$@) unless eval $_[0]; |
f1ca563b LW |
22 | } |
23 | ||
24 | sub panic { | |
748a9306 LW |
25 | package DB; |
26 | ||
f1ca563b LW |
27 | select(STDERR); |
28 | ||
29 | print "\npanic: @_\n"; | |
30 | ||
31 | exit 1 if $] <= 4.003; # caller broken | |
32 | ||
33 | # stack traceback gratefully borrowed from perl debugger | |
34 | ||
748a9306 LW |
35 | local $_; |
36 | my $i; | |
37 | my ($p,$f,$l,$s,$h,$a,@a,@frames); | |
f1ca563b | 38 | for ($i = 0; ($p,$f,$l,$s,$h,$w) = caller($i); $i++) { |
748a9306 | 39 | @a = @args; |
f1ca563b LW |
40 | for (@a) { |
41 | if (/^StB\000/ && length($_) == length($_main{'_main'})) { | |
42 | $_ = sprintf("%s",$_); | |
43 | } | |
44 | else { | |
45 | s/'/\\'/g; | |
46 | s/([^\0]*)/'$1'/ unless /^-?[\d.]+$/; | |
47 | s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg; | |
48 | s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg; | |
49 | } | |
50 | } | |
51 | $w = $w ? '@ = ' : '$ = '; | |
52 | $a = $h ? '(' . join(', ', @a) . ')' : ''; | |
748a9306 | 53 | push(@frames, "$w&$s$a from file $f line $l\n"); |
f1ca563b | 54 | } |
748a9306 LW |
55 | for ($i=0; $i <= $#frames; $i++) { |
56 | print $frames[$i]; | |
f1ca563b LW |
57 | } |
58 | exit 1; | |
59 | } | |
60 | ||
61 | 1; |