checkpatch: warn on missing spaces in broken up quoted

Checkpatch already complains when people break up quoted strings but
it's still pretty common.  One mistake that people often make is they
leave out the space character between the two strings.

This check adds around 450 new warnings and has a low rate of false
positives.

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

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 9f14bf9..da74e65 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2361,6 +2361,12 @@ sub process {
                             "quoted string split across lines\n" . $hereprev);
                }
 
+# check for missing a space in a string concatination
+               if ($prevrawline =~ /[^\\]\w"$/ && $rawline =~ /^\+[\t ]+"\w/) {
+                       WARN('MISSING_SPACE',
+                            "break quoted strings at a space character\n" . $hereprev);
+               }
+
 # check for spaces before a quoted newline
                if ($rawline =~ /^.*\".*\s\\n/) {
                        if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",