checkpatch: add ability to --fix (coalesce) string fragments on multiple lines

Add --fix option to coalesce string fragments.

This does not coalesce string fragments that have newline terminations or
are otherwise exempted.

Other miscellanea:

o move all the string tests together.
o fix get_quoted_string function for tab characters
o fix concatination typo

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

1 files changed, 69 insertions, 46 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 6d85c7b1b27e..f0bb6d60c07b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -946,7 +946,7 @@ sub sanitise_line {
 sub get_quoted_string {
         my ($line, $rawline) = @_;
 
-        return "" if ($line !~ m/(\"[X]+\")/g);
+        return "" if ($line !~ m/(\"[X\t]+\")/g);
         return substr($rawline, $-[0], $+[0] - $-[0]);
 }
 
@@ -1847,6 +1847,7 @@ sub process {
         my $non_utf8_charset = 0;
 
         my $last_blank_line = 0;
+        my $last_coalesced_string_linenr = -1;
 
         our @report = ();
         our $cnt_lines = 0;
@@ -2413,33 +2414,6 @@ sub process {
                              "line over $max_line_length characters\n" . $herecurr);
                 }
 
-# Check for user-visible strings broken across lines, which breaks the ability
-# to grep for the string.  Make exceptions when the previous string ends in a
-# newline (multiple lines in one string constant) or '\t', '\r', ';', or '{'
-# (common in inline assembly) or is a octal \123 or hexadecimal \xaf value
-                if ($line =~ /^\+\s*"/ &&
-                    $prevline =~ /"\s*$/ &&
-                    $prevrawline !~ /(?:\\(?:[ntr]|[0-7]{1,3}|x[0-9a-fA-F]{1,2})|;\s*|\{\s*)"\s*$/) {
-                        WARN("SPLIT_STRING",
-                             "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",
-                                 "unnecessary whitespace before a quoted newline\n" . $herecurr) &&
-                            $fix) {
-                                $fixed[$fixlinenr] =~ s/^(\+.*\".*)\s+\\n/$1\\n/;
-                        }
-
-                }
-
 # check for adding lines without a newline.
                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
                         WARN("MISSING_EOF_NEWLINE",
@@ -4458,6 +4432,55 @@ sub process {
                              "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
                 }
 
+# Check for user-visible strings broken across lines, which breaks the ability
+# to grep for the string.  Make exceptions when the previous string ends in a
+# newline (multiple lines in one string constant) or '\t', '\r', ';', or '{'
+# (common in inline assembly) or is a octal \123 or hexadecimal \xaf value
+                if ($line =~ /^\+\s*"[X\t]*"/ &&
+                    $prevline =~ /"\s*$/ &&
+                    $prevrawline !~ /(?:\\(?:[ntr]|[0-7]{1,3}|x[0-9a-fA-F]{1,2})|;\s*|\{\s*)"\s*$/) {
+                        if (WARN("SPLIT_STRING",
+                                 "quoted string split across lines\n" . $hereprev) &&
+                                     $fix &&
+                                     $prevrawline =~ /^\+.*"\s*$/ &&
+                                     $last_coalesced_string_linenr != $linenr - 1) {
+                                my $extracted_string = get_quoted_string($line, $rawline);
+                                my $comma_close = "";
+                                if ($rawline =~ /\Q$extracted_string\E(\s*\)\s*;\s*$|\s*,\s*)/) {
+                                        $comma_close = $1;
+                                }
+
+                                fix_delete_line($fixlinenr - 1, $prevrawline);
+                                fix_delete_line($fixlinenr, $rawline);
+                                my $fixedline = $prevrawline;
+                                $fixedline =~ s/"\s*$//;
+                                $fixedline .= substr($extracted_string, 1) . trim($comma_close);
+                                fix_insert_line($fixlinenr - 1, $fixedline);
+                                $fixedline = $rawline;
+                                $fixedline =~ s/\Q$extracted_string\E\Q$comma_close\E//;
+                                if ($fixedline !~ /\+\s*$/) {
+                                        fix_insert_line($fixlinenr, $fixedline);
+                                }
+                                $last_coalesced_string_linenr = $linenr;
+                        }
+                }
+
+# check for missing a space in a string concatenation
+                if ($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",
+                                 "unnecessary whitespace before a quoted newline\n" . $herecurr) &&
+                            $fix) {
+                                $fixed[$fixlinenr] =~ s/^(\+.*\".*)\s+\\n/$1\\n/;
+                        }
+
+                }
+
 # concatenated string without spaces between elements
                 if ($line =~ /"X+"[A-Z_]+/ || $line =~ /[A-Z_]+"X+"/) {
                         CHK("CONCATENATED_STRING",
@@ -4470,6 +4493,24 @@ sub process {
                              "Consecutive strings are generally better as a single string\n" . $herecurr);
                 }
 
+# check for %L{u,d,i} in strings
+                my $string;
+                while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
+                        $string = substr($rawline, $-[1], $+[1] - $-[1]);
+                        $string =~ s/%%/__/g;
+                        if ($string =~ /(?<!%)%L[udi]/) {
+                                WARN("PRINTF_L",
+                                     "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
+                                last;
+                        }
+                }
+
+# check for line continuations in quoted strings with odd counts of "
+                if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
+                        WARN("LINE_CONTINUATIONS",
+                             "Avoid line continuations in quoted strings\n" . $herecurr);
+                }
+
 # warn about #if 0
                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
                         CHK("REDUNDANT_CODE",
@@ -4754,12 +4795,6 @@ sub process {
                         }
                 }
 
-# check for line continuations in quoted strings with odd counts of "
-                if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
-                        WARN("LINE_CONTINUATIONS",
-                             "Avoid line continuations in quoted strings\n" . $herecurr);
-                }
-
 # check for struct spinlock declarations
                 if ($line =~ /^.\s*\bstruct\s+spinlock\s+\w+\s*;/) {
                         WARN("USE_SPINLOCK_T",
@@ -5169,18 +5204,6 @@ sub process {
                               "#define of '$1' is wrong - use Kconfig variables or standard guards instead\n" . $herecurr);
                 }
 
-# check for %L{u,d,i} in strings
-                my $string;
-                while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
-                        $string = substr($rawline, $-[1], $+[1] - $-[1]);
-                        $string =~ s/%%/__/g;
-                        if ($string =~ /(?<!%)%L[udi]/) {
-                                WARN("PRINTF_L",
-                                     "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
-                                last;
-                        }
-                }
-
 # whine mightly about in_atomic
                 if ($line =~ /\bin_atomic\s*\(/) {
                         if ($realfile =~ m@^drivers/@) {