#!/usr/bin/awk -f
  #
  # genregdb.awk -- generate regdb.c from db.txt
  #
  # Actually, it reads from stdin (presumed to be db.txt) and writes
  # to stdout (presumed to be regdb.c), but close enough...
  #
  # Copyright 2009 John W. Linville <linville@tuxdriver.com>
  #

  # Permission to use, copy, modify, and/or distribute this software for any
  # purpose with or without fee is hereby granted, provided that the above
  # copyright notice and this permission notice appear in all copies.

  #

  # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

  
  BEGIN {
  	active = 0
  	rules = 0;
  	print "/*"
  	print " * DO NOT EDIT -- file generated from data in db.txt"
  	print " */"
  	print ""
  	print "#include <linux/nl80211.h>"
  	print "#include <net/cfg80211.h>"

  	print "#include \"regdb.h\""

  	print ""
  	regdb = "const struct ieee80211_regdomain *reg_regdb[] = {
  "
  }

  function parse_country_head() {

  	country=$2
  	sub(/:/, "", country)
  	printf "static const struct ieee80211_regdomain regdom_%s = {
  ", country
  	printf "\t.alpha2 = \"%s\",
  ", country

  	if ($NF ~ /DFS-ETSI/)
  		printf "\t.dfs_region = NL80211_DFS_ETSI,
  "
  	else if ($NF ~ /DFS-FCC/)
  		printf "\t.dfs_region = NL80211_DFS_FCC,
  "
  	else if ($NF ~ /DFS-JP/)
  		printf "\t.dfs_region = NL80211_DFS_JP,
  "

  	printf "\t.reg_rules = {
  "
  	active = 1
  	regdb = regdb "\t&regdom_" country ",
  "
  }

  function parse_reg_rule()
  {

  	flag_starts_at = 7

  	start = $1
  	sub(/\(/, "", start)
  	end = $3
  	bw = $5
  	sub(/\),/, "", bw)

  	gain = 0
  	power = $6

  	# power might be in mW...

  	units = $7
  	dfs_cac = 0
  
  	sub(/\(/, "", power)
  	sub(/\),/, "", power)
  	sub(/\),/, "", units)

  	sub(/\)/, "", units)

  	if (units == "mW") {

  		flag_starts_at = 8

  		power = 10 * log(power)/log(10)

  		if ($8 ~ /[[:digit:]]/) {
  			flag_starts_at = 9
  			dfs_cac = $8
  		}

  	} else {

  		if ($7 ~ /[[:digit:]]/) {
  			flag_starts_at = 8
  			dfs_cac = $7
  		}

  	}

  	sub(/\(/, "", dfs_cac)

  	sub(/\),/, "", dfs_cac)

  	flagstr = ""

  	for (i=flag_starts_at; i<=NF; i++)

  		flagstr = flagstr $i
  	split(flagstr, flagarray, ",")
  	flags = ""
  	for (arg in flagarray) {
  		if (flagarray[arg] == "NO-OFDM") {
  			flags = flags "
  \t\t\tNL80211_RRF_NO_OFDM | "
  		} else if (flagarray[arg] == "NO-CCK") {
  			flags = flags "
  \t\t\tNL80211_RRF_NO_CCK | "
  		} else if (flagarray[arg] == "NO-INDOOR") {
  			flags = flags "
  \t\t\tNL80211_RRF_NO_INDOOR | "
  		} else if (flagarray[arg] == "NO-OUTDOOR") {
  			flags = flags "
  \t\t\tNL80211_RRF_NO_OUTDOOR | "
  		} else if (flagarray[arg] == "DFS") {
  			flags = flags "
  \t\t\tNL80211_RRF_DFS | "
  		} else if (flagarray[arg] == "PTP-ONLY") {
  			flags = flags "
  \t\t\tNL80211_RRF_PTP_ONLY | "
  		} else if (flagarray[arg] == "PTMP-ONLY") {
  			flags = flags "
  \t\t\tNL80211_RRF_PTMP_ONLY | "
  		} else if (flagarray[arg] == "PASSIVE-SCAN") {

  			flags = flags "
  \t\t\tNL80211_RRF_NO_IR | "

  		} else if (flagarray[arg] == "NO-IBSS") {

  			flags = flags "
  \t\t\tNL80211_RRF_NO_IR | "
  		} else if (flagarray[arg] == "NO-IR") {
  			flags = flags "
  \t\t\tNL80211_RRF_NO_IR | "

  		} else if (flagarray[arg] == "AUTO-BW") {
  			flags = flags "
  \t\t\tNL80211_RRF_AUTO_BW | "

  		}

  	}
  	flags = flags "0"

  	printf "\t\tREG_RULE_EXT(%d, %d, %d, %d, %.0f, %d, %s),
  ", start, end, bw, gain, power, dfs_cac, flags

  	rules++
  }

  function print_tail_country()
  {

  	active = 0
  	printf "\t},
  "
  	printf "\t.n_reg_rules = %d
  ", rules
  	printf "};
  
  "
  	rules = 0;
  }

  /^[ \t]*#/ {
  	# Ignore
  }
  
  !active && /^[ \t]*$/ {
  	# Ignore
  }
  
  !active && /country/ {
  	parse_country_head()
  }
  
  active && /^[ \t]*\(/ {
  	parse_reg_rule()
  }
  
  active && /^[ \t]*$/ {
  	print_tail_country()
  }

  END {

  	if (active)
  		print_tail_country()

  	print regdb "};"
  	print ""
  	print "int reg_regdb_size = ARRAY_SIZE(reg_regdb);"
  }