#!/usr/bin/perl

open STDIN, "<AIO.xs"
   or die "AIO.xs: $!";

open STDOUT, ">def0.h"
   or die "def0.h: $!";

print <<EOF;
/* GENERATED FILE */
/* use ./gendef0 to regenerate this file */
EOF

while (<>) {
   if (/^\s*const_iv\s*\((\S+)\)\s*$/ || /^\s*const_niv\s*\([^,]+,\s*(\S+)\)\s*$/) {
      print "#ifndef $1\n",
            "#define $1 0\n",
            "#endif\n";
   }
}