76 lines
2.8 KiB
Perl
Executable File
76 lines
2.8 KiB
Perl
Executable File
#! /usr/bin/env perl
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# Generate query_config.c
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#
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# The file query_config.c contains a C function that can be used to check if
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# a configuration macro is defined and to retrieve its expansion in string
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# form (if any). This facilitates querying the compile time configuration of
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# the library, for example, for testing.
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#
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# The query_config.c is generated from the current configuration at
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# include/mbedtls/config.h. The idea is that the config.h contains ALL the
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# compile time configurations available in Mbed TLS (commented or uncommented).
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# This script extracts the configuration macros from the config.h and this
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# information is used to automatically generate the body of the query_config()
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# function by using the template in scripts/data_files/query_config.fmt.
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#
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# Usage: ./scripts/generate_query_config.pl without arguments
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use strict;
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my $config_file = "./include/mbedtls/config.h";
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my $query_config_format_file = "./scripts/data_files/query_config.fmt";
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my $query_config_file = "./programs/ssl/query_config.c";
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# Excluded macros from the generated query_config.c. For example, macros that
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# have commas or function-like macros cannot be transformed into strings easily
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# using the preprocessor, so they should be excluded or the preprocessor will
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# throw errors.
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my @excluded = qw(
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MBEDTLS_SSL_CIPHERSUITES
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MBEDTLS_PARAM_FAILED
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);
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my $excluded_re = join '|', @excluded;
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open(CONFIG_FILE, "$config_file") or die "Opening config file '$config_file': $!";
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# This variable will contain the string to replace in the CHECK_CONFIG of the
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# format file
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my $config_check = "";
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while (my $line = <CONFIG_FILE>) {
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if ($line =~ /^(\/\/)?\s*#\s*define\s+(MBEDTLS_\w+).*/) {
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my $name = $2;
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# Skip over the macro that prevents multiple inclusion
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next if "MBEDTLS_CONFIG_H" eq $name;
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# Skip over the macro if it is in the ecluded list
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next if $name =~ /$excluded_re/;
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$config_check .= "#if defined($name)\n";
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$config_check .= " if( strcmp( \"$name\", config ) == 0 )\n";
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$config_check .= " {\n";
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$config_check .= " MACRO_EXPANSION_TO_STR( $name );\n";
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$config_check .= " return( 0 );\n";
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$config_check .= " }\n";
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$config_check .= "#endif /* $name */\n";
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$config_check .= "\n";
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}
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}
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# Read the full format file into a string
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local $/;
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open(FORMAT_FILE, "$query_config_format_file") or die "Opening query config format file '$query_config_format_file': $!";
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my $query_config_format = <FORMAT_FILE>;
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close(FORMAT_FILE);
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# Replace the body of the query_config() function with the code we just wrote
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$query_config_format =~ s/CHECK_CONFIG/$config_check/g;
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# Rewrite the query_config.c file
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open(QUERY_CONFIG_FILE, ">$query_config_file") or die "Opening destination file '$query_config_file': $!";
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print QUERY_CONFIG_FILE $query_config_format;
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close(QUERY_CONFIG_FILE);
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