blob: e3bbaa0745a2a7b8cfb27078916f0a5d4642176c [file] [log] [blame]
#! /usr/bin/env perl
# Generate query_config.c
# The file query_config.c contains a C function that can be used to check if
# a configuration macro is defined and to retrieve its expansion in string
# form (if any). This facilitates querying the compile time configuration of
# the library, for example, for testing.
# The query_config.c is generated from the current configuration at
# include/mbedtls/mbedtls_config.h. The idea is that the mbedtls_config.h contains ALL the
# compile time configurations available in Mbed TLS (commented or uncommented).
# This script extracts the configuration macros from the mbedtls_config.h and this
# information is used to automatically generate the body of the query_config()
# function by using the template in scripts/data_files/query_config.fmt.
# Usage: ./scripts/ without arguments
# Copyright The Mbed TLS Contributors
# SPDX-License-Identifier: Apache-2.0
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
use strict;
my $config_file = "./include/mbedtls/mbedtls_config.h";
my $query_config_format_file = "./scripts/data_files/query_config.fmt";
my $query_config_file = "./programs/test/query_config.c";
unless( -f $config_file && -f $query_config_format_file ) {
chdir '..' or die;
-f $config_file && -f $query_config_format_file
or die "Without arguments, must be run from root or a subdirectory\n";
# Excluded macros from the generated query_config.c. For example, macros that
# have commas or function-like macros cannot be transformed into strings easily
# using the preprocessor, so they should be excluded or the preprocessor will
# throw errors.
my @excluded = qw(
my $excluded_re = join '|', @excluded;
open(CONFIG_FILE, "$config_file") or die "Opening config file '$config_file': $!";
# This variable will contain the string to replace in the CHECK_CONFIG of the
# format file
my $config_check = "";
while (my $line = <CONFIG_FILE>) {
if ($line =~ /^(\/\/)?\s*#\s*define\s+(MBEDTLS_\w+).*/) {
my $name = $2;
# Skip over the macro if it is in the ecluded list
next if $name =~ /$excluded_re/;
$config_check .= "#if defined($name)\n";
$config_check .= " if( strcmp( \"$name\", config ) == 0 )\n";
$config_check .= " {\n";
$config_check .= " MACRO_EXPANSION_TO_STR( $name );\n";
$config_check .= " return( 0 );\n";
$config_check .= " }\n";
$config_check .= "#endif /* $name */\n";
$config_check .= "\n";
# Read the full format file into a string
local $/;
open(FORMAT_FILE, "$query_config_format_file") or die "Opening query config format file '$query_config_format_file': $!";
my $query_config_format = <FORMAT_FILE>;
# Replace the body of the query_config() function with the code we just wrote
$query_config_format =~ s/CHECK_CONFIG/$config_check/g;
# Rewrite the query_config.c file
open(QUERY_CONFIG_FILE, ">$query_config_file") or die "Opening destination file '$query_config_file': $!";
print QUERY_CONFIG_FILE $query_config_format;