Make config.pl more versatile
diff --git a/scripts/config.pl b/scripts/config.pl
new file mode 100755
index 0000000..d04be59
--- /dev/null
+++ b/scripts/config.pl
@@ -0,0 +1,112 @@
+#!/usr/bin/perl
+
+# Tune the configuration file
+
+use warnings;
+use strict;
+
+my $usage = <<EOU;
+$0 [-f <file>] full
+$0 [-f <file>] unset <name>
+$0 [-f <file>] set <name> [<value>]
+EOU
+
+# Things that shouldn't be enabled with "full".
+# Notes:
+# - POLARSSL_X509_ALLOW_EXTENSIONS_NON_V3 and
+# POLARSSL_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION could be enabled if the
+# respective tests were adapted
+my @excluded = qw(
+POLARSSL_HAVE_INT8
+POLARSSL_HAVE_INT16
+POLARSSL_HAVE_SSE2
+POLARSSL_PLATFORM_NO_STD_FUNCTIONS
+POLARSSL_ECP_DP_M221_ENABLED
+POLARSSL_ECP_DP_M383_ENABLED
+POLARSSL_ECP_DP_M511_ENABLED
+POLARSSL_NO_DEFAULT_ENTROPY_SOURCES
+POLARSSL_NO_PLATFORM_ENTROPY
+POLARSSL_SSL_HW_RECORD_ACCEL
+POLARSSL_X509_ALLOW_EXTENSIONS_NON_V3
+POLARSSL_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
+POLARSSL_ZLIB_SUPPORT
+POLARSSL_PKCS11_C
+_ALT\s*$
+);
+
+my $config_file = "include/polarssl/config.h";
+
+# get -f option
+if (@ARGV >= 2 && $ARGV[0] eq "-f") {
+ shift; # -f
+ $config_file = shift;
+
+ -f $config_file or die "No such file: $config_file\n";
+} else {
+ if (! -f $config_file) {
+ chdir '..' or die;
+ -d $config_file
+ or die "Without -f, must be run from root or scripts\n"
+ }
+}
+
+# get action
+die $usage unless @ARGV;
+my $action = shift;
+
+my ($name, $value);
+if ($action eq "full") {
+ # nothing to do
+} elsif ($action eq "unset") {
+ die $usage unless @ARGV;
+ $name = shift;
+} elsif ($action eq "set") {
+ die $usage unless @ARGV;
+ $name = shift;
+ $value = shift if @ARGV;
+} else {
+ die $usage;
+}
+die $usage if @ARGV;
+
+open my $config_read, '<', $config_file or die "read $config_file: $!\n";
+my @config_lines = <$config_read>;
+close $config_read;
+
+my $exclude_re = join '|', @excluded;
+
+open my $config_write, '>', $config_file or die "write $config_file: $!\n";
+
+my $done;
+for my $line (@config_lines) {
+ if ($action eq "full") {
+ if ($line =~ /name SECTION: Module configuration options/) {
+ $done = 1;
+ }
+
+ if (!$done && $line =~ m!^//\s?#define! && $line !~ /$exclude_re/) {
+ $line =~ s!^//!!;
+ }
+ } elsif ($action eq "unset") {
+ if (!$done && $line =~ /^\s*#define\s*$name/) {
+ $line = '//' . $line;
+ $done = 1;
+ }
+ } elsif (!$done && $action eq "set") {
+ if ($line =~ m!^(?://)?\s*#define\s*$name!) {
+ $line = "#define $name";
+ $line .= " $value" if defined $value && $value ne "";
+ $line .= "\n";
+ $done = 1;
+ }
+ }
+
+ print $config_write $line;
+}
+
+close $config_write;
+
+warn "configuration section not found" if ($action eq "full" && !$done);
+warn "$name not found" if ($action ne "full" && !$done);
+
+__END__
