#!/bin/perl 
#
# Copyright 2003, Purdue University.
# Permission is hereby granted to reproduce and distribute copies of this work
# for nonprofit educational purposes, provided that copies are distributed at
# or below cost, and that the author, source, and copyright notice are
# included on each copy. This permission is in addition to rights of
# reproduction granted under Sections 107, 108, and other provisions of the
# U.S. Copyright Act.
#
# Author information
# 
# Dr. Mark C. Johnson
# School of Electrical and Computer Engineering
# Purdue University, Campus Box EE38
# 465 Northwestern Avenue
# West Lafayette, IN 47907-2035
# 
# E-mail: mcjohnso@purdue.edu
#
# a script which grounds all caps in a spice netlist
# (only those which are not already grounded)
#
# as a result, two caps are created, one for each 
# node of the original cap.
# It is assumed that the original cap names are of the form C#
# The new caps will have names of the form C#a and C#b

while (<>) {
  chomp;
  if (index($_,"C")==0 or index($_,"c")==0) {
    @chunks = split(/\s+/);

    $gnd1st = (@chunks[1] eq "0") or (index(@chunks[1],"gnd") > -1) or 
      (index(@chunks[1],"GND") > -1);
    $gnd2nd = (@chunks[2] eq "0") or (index(@chunks[2],"gnd") > -1) or 
      (index(@chunks[2],"GND") > -1);

    if (not $gnd1st and not $gnd2nd) {
      @capa = @chunks;
      @capb = @chunks;

      @capa[0] = @capa[0] . "a";
      @capa[2] = "0";

      @capb[0] = @capb[0] . "b";
      @capb[1] = @capb[2];
      @capb[2] = "0";

      foreach $field (@capa) {
        print $field . " ";
      }
      print "\n";

      foreach $field (@capb) {
        print $field . " ";
      }
      print "\n";
    } else {
      foreach $field (@chunks) {
        print $field . " ";
      }
      print "\n";
    }

  } else {
    print $_ . "\n";
  }
}