gluster: Fix the recursive goto outs in the source code.

Added a script check_goto.pl, that when run from
the source code root, will scan all .c files to match
the following pattern:

label:
        if (condition)
            goto label;

On finding such a pattern the script will print the file name
and the line number. There are certain cases where the above
recursive pattern is intended. Hence adding those labels to
ignore-labels. Thanks Vijaikumar Mallikarjuna for the perl
script.

Also fixed all such existing errors

BUG: 1138952
Change-Id: Ie6b75621711736e7e30f2f9d25e50435d58fc1e2
Signed-off-by: Vijaikumar Mallikarjuna <vmallika@redhat.com>
Signed-off-by: Avra Sengupta <asengupt@redhat.com>
Reviewed-on: http://review.gluster.org/8307
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>
Tested-by: Krishnan Parthasarathi <kparthas@redhat.com>
Reviewed-on: http://review.gluster.org/8637
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/extras/check_goto.pl b/extras/check_goto.pl
new file mode 100755
index 00000000000..fa71bfc6683
--- /dev/null
+++ b/extras/check_goto.pl
@@ -0,0 +1,45 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+
+my @ignore_labels = qw (TODO retry fetch_data again try_again sp_state_read_proghdr redo disabled_loop fd_alloc_try_again);
+my @ignore_files  = qw (y.tab.c lex.c);
+my @c_files;
+my $line;
+my @labels;
+my $in_comments;
+
+{
+        local $" = "|";
+        my $cmd = "find . -type f -name '*.c' | grep -vE '(@ignore_files)'";
+        @c_files = `$cmd`;
+}
+
+foreach my $file (@c_files) {
+        chomp ($file);
+        open FD, $file or die ("Failed to read file $file: $!");
+        @labels = ();
+        $in_comments = 0;
+        while ($line = <FD>) {
+                chomp ($line);
+
+                next if $line =~ /^\s*(#|\/\/)/;
+                $in_comments = 1 if ($line =~ /\/\*/);
+                $in_comments = 0 if ($line =~ /\*\//);
+
+                next if $in_comments;
+                if ($line =~ /^\s*(([a-zA-Z]|_)\w*)\s*:/) {
+                        push (@labels, $1) unless grep (/$1/, @ignore_labels);
+                }
+                @labels = () if $line =~ /^}/;
+
+                next unless @labels;
+                if ($line =~ /^\s*goto\s*(\w+)/) {
+                        print "$file:$.: $line\n" if grep /^$1$/, @labels;
+                }
+        }
+
+        close FD;
+}
+