ref: 4a294824b03717f1bff0dbd887763b433c2b6253
parent: 4259b0f934c8fb5a4b4665ae7a82981c6242c45c
parent: 5e9de74735d09b2a43e8d1c6314f2a7839b6e55a
author: Rangi <[email protected]>
date: Wed Jun 3 08:24:54 EDT 2020
Merge branch 'master' of https://github.com/pret/pokecrystal
--- /dev/null
+++ b/tools/free_space.awk
@@ -1,0 +1,70 @@
+#!/usr/bin/gawk -f
+
+# Usage: tools/free_space.awk [BANK=<bank_spec>] pokecrystal.map
+
+# The BANK argument allows printing free space in one, all, or none of the ROM's banks.
+# Valid arguments are numbers (in decimal "42" or hexadecimal "0x2a"), "all" or "none".
+# If not specified, defaults to "none".
+# The `BANK` argument MUST be before the map file name, otherwise it has no effect!
+# Yes: tools/free_space.awk BANK=all pokecrystal.map
+# No: tools/free_space.awk pokecrystal.map BANK=42
+
+# Copyright (c) 2020, Eldred Habert.
+# SPDX-License-Identifier: MIT
+
+BEGIN {+ nb_banks = 0
+ free = 0
+ rom_bank = 0 # Safety net for malformed files
+
+ # Default settings
+ # Variables assigned via the command-line (except through `-v`) are *after* `BEGIN`
+ BANK="none"
+}
+
+# Only accept ROM banks, ignore everything else
+toupper($0) ~ /^[ \t]*ROM[0X][ \t]+BANK[ \t]+#/ {+ nb_banks++
+ rom_bank = 1
+ split($0, fields, /[ \t]/)
+ bank_num = strtonum(substr(fields[3], 2))
+}
+
+function register_bank(amount) {+ free += amount
+ rom_bank = 0 # Reject upcoming banks by default
+
+ if (BANK ~ /all/ || BANK == bank_num) {+ printf "Bank %3d: %5d/16384 (%.2f%%)\n", bank_num, amount, amount * 100 / 16384
+ }
+}
+
+rom_bank && toupper($0) ~ /^[ \t]*EMPTY/ {+ # Empty bank
+ register_bank(16384)
+}
+rom_bank && toupper($0) ~ /^[ \t]*SLACK:[ \t]/ {+ if ($2 ~ /\$[0-9A-F]+/) {+ register_bank(strtonum("0x" substr($2, 2)))+ } else {+ printf "Malformed slack line? \"%s\" does not start with '$'\n", $2
+ }
+}
+
+END {+ # Determine number of banks, by rounding to upper power of 2
+ total_banks = 2 # Smallest size is 2 banks
+ while (total_banks < nb_banks) {+ total_banks *= 2
+ }
+
+ # RGBLINK omits "trailing" ROM banks, so fake them
+ bank_num = nb_banks
+ while (bank_num < total_banks) {+ register_bank(16384)
+ bank_num++
+ }
+
+ total = total_banks * 16384
+ printf "Free space: %5d/%5d (%.2f%%)\n", free, total, free * 100 / total
+}