checkpatch: add check for line continuations in quoted strings

Add a warning for unterminated quoted strings with line continuations as
these frequently add unwanted whitespace.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index d8670810db65..5c9672951077 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2748,6 +2748,11 @@ sub process {
                         WARN("sizeof(& should be avoided\n" . $herecurr);
                 }
 
+# check for line continuations in quoted strings with odd counts of "
+                if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
+                        WARN("Avoid line continuations in quoted strings\n" . $herecurr);
+                }
+
 # check for new externs in .c files.
                 if ($realfile =~ /\.c$/ && defined $stat &&
                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)