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fix(gen_expand): add numeric validation for input argument n #58

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fix(gen_expand): add numeric validation for input argument n #58

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7 changes: 4 additions & 3 deletions gen_expand
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Original file line number Diff line number Diff line change
Expand Up @@ -15,10 +15,11 @@
use warnings;
use strict;

defined(my $n = shift)
or die "usage: $0 n\n";
my $n = shift;
(defined($n) && $n =~ /^\d+$/ && $n >= 1)
or die "usage: $0 <positive_integer_n>\n";

# special cases i can't be bothered to handle otherwise
# special cases I can't be bothered to handle otherwise
print "#define x1(x) x\n";
print "#define x2(x) x x\n";
print "#define x3(x) x2(x) x\n";
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