Perl util to do with_libctx renaming

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12970)

diff --git a/util/withlibctx.pl b/util/withlibctx.pl
new file mode 100755 (executable)
index 0000000..a8fe22d
--- /dev/null
+++ b/util/withlibctx.pl
@@ -0,0 +1,141 @@
+#! /usr/bin/env perl
+
+use strict;
+use warnings;
+use File::Temp qw/tempfile/;
+
+my $topdir = shift;
+
+processallfiles($topdir);
+print "Success\n";
+
+sub processallfiles {
+    my $dir = shift;
+    my @files = glob "$dir/*.c $dir/*.h $dir/*.h.in $dir/*.pod *dir/*.pod.in";
+
+    open (my $STDOUT_ORIG, '>&', STDOUT);
+
+    foreach my $file (@files) {
+        my ($tmpfh, $tmpfile) = tempfile();
+
+        print "Processing $file\n";
+        open(STDOUT, '>>', $tmpfile);
+        open(INFILE, $file);
+        processfile(\*INFILE);
+        close(STDOUT);
+        rename($tmpfile, $file);
+        unlink($tmpfile);
+        # restore STDOUT
+        open (STDOUT, '>&', $STDOUT_ORIG);
+    }
+
+    #Recurse through subdirs
+    opendir my $dh, $dir or die "Cannot open directory";
+
+    while (defined(my $subdir = readdir $dh)) {
+        next unless -d "$dir/$subdir";
+        next if (rindex $subdir, ".", 0) == 0;
+        processallfiles("$dir/$subdir");
+    }
+    closedir $dh;
+}
+
+sub processfile {
+    my $fh = shift;
+    my $multiline = 0;
+    my @params;
+    my $indent;
+    my $paramstr = "";
+
+    foreach my $line (<$fh>) {
+        chomp($line);
+        if (!$multiline) {
+            if ($line =~ /^(.+)_with_libctx\((.*[^\\])$/) {
+                my $preline = $1;
+                my $postline = $2;
+                #Strip trailing whitespace
+                $postline =~ s/\s+$//;
+                print $preline.'_ex(';
+                my @rets = extracttoclose($postline);
+                if (@rets) {
+                    print "$postline\n";
+                    $multiline = 0;
+                } else {
+                    $multiline = 1;
+                    $paramstr = $postline;
+                    $indent = (length $preline) + (length '_ex(');
+                }
+            } else {
+                #Any other reference to _with_libctx we just replace
+                $line =~ s/_with_libctx/_ex/g;
+                print $line."\n";
+            }
+        } else {
+            #Strip leading whitespace
+            $line =~ s/^\s+//;
+            #Strip trailing whitespace
+            $line =~ s/\s+$//;
+            my @rets = extracttoclose($paramstr.$line);
+            if (@rets) {
+                my $pre = shift @rets;
+                my $post = shift @rets;
+                @params = split(",", $pre);
+                my @params = grep(s/^\s*|\s*$//g, @params);
+                formatparams($indent, @params);
+                print ')'.$post."\n";
+                $multiline = 0;
+            } else {
+                $paramstr .= $line;
+            }
+        }
+    }
+
+    die "End of multiline not found" if $multiline;
+}
+
+sub formatparams {
+    my $indent = shift;
+    my @params = @_;
+
+    if (@params) {
+        my $param = shift @params;
+        my $lensofar += $indent + (length $param) + 1;
+
+        print "$param";
+        print "," if @params;
+
+        while (@params) {
+            my $param = shift @params;
+
+            if (($lensofar + (length $param) + 2) > 80) {
+                print "\n".(" " x $indent);
+                print $param;
+                $lensofar = $indent + (length $param) + 1;
+            } else {
+                print ' '.$param;
+                $lensofar += (length $param) + 2;
+            }
+            print "," if @params;
+        }
+    }
+}
+
+sub extracttoclose {
+    my $inline = shift;
+    my $outline = "";
+
+    while ($inline =~ /^([^\)]*?)\((.*)$/) {
+        my @rets = extracttoclose($2);
+        if (!@rets) {
+            return ();
+        }
+        my $inside = shift @rets;
+        my $post = shift @rets;
+        $outline .= $1.'('.$inside.')';
+        $inline = $post;
+    }
+    if ($inline =~ /^(.*?)\)(.*)$/) {
+        return ($outline.$1, $2);
+    }
+    return ();
+}