expunge-gconv-modules
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#!/usr/bin/env bash
# This script is used to generate a gconv-modules file that takes into
# account only the gconv modules installed by Buildroot. It receives
# on its standard input the original complete gconv-modules file from
# the toolchain, and as arguments the list of gconv modules that were
# actually installed, and writes on its standard output the new
# gconv-modules file.
# The format of gconv-modules is precisely documented in the
# file itself. It consists of two different directives:
# module FROMSET TOSET FILENAME COST
# alias ALIAS REALNAME
# and that's what this script parses and generates.
#
# There are two kinds of 'module' directives:
# - the first defines conversion of a charset to/from INTERNAL representation
# - the second defines conversion of a charset to/from another charset
# we handle each with slightly different code, since the second never has
# associated aliases.
gawk -v files="${1}" '
$1 == "alias" {
aliases[$3] = aliases[$3] " " $2;
}
$1 == "module" && $2 != "INTERNAL" && $3 == "INTERNAL" {
file2internals[$4] = file2internals[$4] " " $2;
mod2cost[$2] = $5;
}
$1 == "module" && $2 != "INTERNAL" && $3 != "INTERNAL" {
file2cset[$4] = file2cset[$4] " " $2 ":" $3;
mod2cost[$2] = $5;
}
END {
nb_files = split(files, all_files);
for(f = 1; f <= nb_files; f++) {
file = all_files[f];
printf("# Modules and aliases for: %s\n", file);
nb_mods = split(file2internals[file], mods);
for(i = 1; i <= nb_mods; i++) {
nb_aliases = split(aliases[mods[i]], mod_aliases);
for(j = 1; j <= nb_aliases; j++) {
printf("alias\t%s\t%s\n", mod_aliases[j], mods[i]);
}
printf("module\t%s\t%s\t%s\t%d\n", mods[i], "INTERNAL", file, mod2cost[mods[i]]);
printf("module\t%s\t%s\t%s\t%d\n", "INTERNAL", mods[i], file, mod2cost[mods[i]]);
printf("\n" );
}
printf("%s", nb_mods != 0 ? "\n" : "");
nb_csets = split(file2cset[file], csets);
for(i = 1; i <= nb_csets; i++) {
split(csets[i], cs, ":");
printf("module\t%s\t%s\t%s\t%d\n", cs[1], cs[2], file, mod2cost[cs[1]]);
}
printf("%s", nb_csets != 0 ? "\n\n" : "");
}
}
'