[PATCH] checkpatch: Add test for keywords not starting on tabstops

[Joe Perches]

It's somewhat common and in general a defect for c90 keywords to
not start on a tabstop.

Add a test for this condition and warn when it occurs.

Signed-off-by: Joe Perches <j...@perches.com>
---
 scripts/checkpatch.pl | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index e3d9c34..6c1213c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2755,6 +2755,19 @@ sub process {
                            "Logical continuations should be on the previous 
line\n" . $hereprev);
                }
 
+# check indentation starts on a tab stop
+               if ($^V && $^V ge 5.10.0 &&
+                   $sline =~ /^\+\t+( 
+)(?:$c90_Keywords\b|\{\s*$|\}\s*(?:else\b|while\b|\s*$))/) {
+                       my $indent = length($1);
+                       if ($indent % 8) {
+                               if (WARN("TABSTOP",
+                                        "Statements should start on a 
tabstop\n" . $herecurr) &&
+                                   $fix) {
+                                       $fixed[$fixlinenr] =~ s@(^\+\t+) +@$1 . 
"\t" x ($indent/8)@e;
+                               }
+                       }
+               }
+
 # check multi-line statement indentation matches previous line
                if ($^V && $^V ge 5.10.0 &&
                    $prevline =~ /^\+([ 
\t]*)((?:$c90_Keywords(?:\s+if)\s*)|(?:$Declare\s*)?(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*|$Ident\s*=\s*$Ident\s*)\(.*(\&\&|\|\||,)\s*$/)
 {
-- 
2.8.0.rc4.16.g56331f8