checkpatch: Support wide strings

Allow prefixing typical strings with L for wide strings

Patch originally by Joe Perches
https://lkml.org/lkml/2017/10/17/1117

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 4142f5c837e21bd912b0770e68cc427c308dec16..e450826c36fddb477a0b26f011f8e5ffacf8c206 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -392,7 +392,7 @@ our $Binary = qr{(?i)0b[01]+$Int_type?};
 our $Hex       = qr{(?i)0x[0-9a-f]+$Int_type?};
 our $Int       = qr{[0-9]+$Int_type?};
 our $Octal     = qr{0[0-7]+$Int_type?};
-our $String    = qr{"[X\t]*"};
+our $String    = qr{(?:\bL)?"[X\t]*"};
 our $Float_hex = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?};
 our $Float_dec = qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?};
 our $Float_int = qr{(?i)[0-9]+e-?[0-9]+[fl]?};
@@ -5254,13 +5254,14 @@ sub process {
                }
 
 # concatenated string without spaces between elements
-               if ($line =~ /$String[A-Z_]/ || $line =~ /[A-Za-z0-9_]$String/) {
+               if ($line =~ /$String[A-Z_]/ ||
+                   ($line =~ /([A-Za-z0-9_]+)$String/ && $1 !~ /^L$/)) {
                        CHK("CONCATENATED_STRING",
                            "Concatenated strings should use spaces between elements\n" . $herecurr);
                }
 
 # uncoalesced string fragments
-               if ($line =~ /$String\s*"/) {
+               if ($line =~ /$String\s*L?"/) {
                        WARN("STRING_FRAGMENTS",
                             "Consecutive strings are generally better as a single string\n" . $herecurr);
                }