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f1ca563b LW |
1 | # assert.pl |
2 | # tchrist@convex.com (Tom Christiansen) | |
3 | # | |
4 | # Usage: | |
5 | # | |
6 | # &assert('@x > @y'); | |
7 | # &assert('$var > 10', $var, $othervar, @various_info); | |
8 | # | |
9 | # That is, if the first expression evals false, we blow up. The | |
10 | # rest of the args, if any, are nice to know because they will | |
11 | # be printed out by &panic, which is just the stack-backtrace | |
12 | # routine shamelessly borrowed from the perl debugger. | |
13 | ||
14 | sub assert { | |
79072805 | 15 | &panic("ASSERTION BOTCHED: $_[$[]",$@) unless eval $_[$[]; |
f1ca563b LW |
16 | } |
17 | ||
18 | sub panic { | |
748a9306 LW |
19 | package DB; |
20 | ||
f1ca563b LW |
21 | select(STDERR); |
22 | ||
23 | print "\npanic: @_\n"; | |
24 | ||
25 | exit 1 if $] <= 4.003; # caller broken | |
26 | ||
27 | # stack traceback gratefully borrowed from perl debugger | |
28 | ||
748a9306 LW |
29 | local $_; |
30 | my $i; | |
31 | my ($p,$f,$l,$s,$h,$a,@a,@frames); | |
f1ca563b | 32 | for ($i = 0; ($p,$f,$l,$s,$h,$w) = caller($i); $i++) { |
748a9306 | 33 | @a = @args; |
f1ca563b LW |
34 | for (@a) { |
35 | if (/^StB\000/ && length($_) == length($_main{'_main'})) { | |
36 | $_ = sprintf("%s",$_); | |
37 | } | |
38 | else { | |
39 | s/'/\\'/g; | |
40 | s/([^\0]*)/'$1'/ unless /^-?[\d.]+$/; | |
41 | s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg; | |
42 | s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg; | |
43 | } | |
44 | } | |
45 | $w = $w ? '@ = ' : '$ = '; | |
46 | $a = $h ? '(' . join(', ', @a) . ')' : ''; | |
748a9306 | 47 | push(@frames, "$w&$s$a from file $f line $l\n"); |
f1ca563b | 48 | } |
748a9306 LW |
49 | for ($i=0; $i <= $#frames; $i++) { |
50 | print $frames[$i]; | |
f1ca563b LW |
51 | } |
52 | exit 1; | |
53 | } | |
54 | ||
55 | 1; |