checkpatch: warn when formats use %Z and suggest %z
vsnprintf extension %Z<foo> is non-standard C. Suggest the use of %z
instead.
Miscellanea:
- Correct the misuse of type string PRINTF_0xDECIMAL type strings are
supposed to be uppercase only. Fix this and add tr/[a-z]/[A-Z] to the
type check in case I forget this again sometime in the future.
- Improve the mechanism to find these defects so all 3 current checks
are done on the format string
[joe@perches.com: correct the misuse of type string PRINTF_0xDECIMAL, improve the mechanism to find these defects]
Link: http://lkml.kernel.org/r/4e3ad74b0c9dc229b06018a2d79655308ddbbebd.1484014173.git.joe@perches.com
Link: http://lkml.kernel.org/r/20170109235955.GA6787@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-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 918259a..baa3c7b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1848,6 +1848,8 @@
sub show_type {
my ($type) = @_;
+ $type =~ tr/[a-z]/[A-Z]/;
+
return defined $use_type{$type} if (scalar keys %use_type > 0);
return !defined $ignore_type{$type};
@@ -5204,18 +5206,27 @@
"Consecutive strings are generally better as a single string\n" . $herecurr);
}
-# check for %L{u,d,i} and 0x%[udi] in strings
- my $string;
+# check for non-standard and hex prefixed decimal printf formats
+ my $show_L = 1; #don't show the same defect twice
+ my $show_Z = 1;
while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
- $string = substr($rawline, $-[1], $+[1] - $-[1]);
+ my $string = substr($rawline, $-[1], $+[1] - $-[1]);
$string =~ s/%%/__/g;
- if ($string =~ /(?<!%)%[\*\d\.\$]*L[udi]/) {
+ # check for %L
+ if ($show_L && $string =~ /%[\*\d\.\$]*L([diouxX])/) {
WARN("PRINTF_L",
- "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
- last;
+ "\%L$1 is non-standard C, use %ll$1\n" . $herecurr);
+ $show_L = 0;
}
- if ($string =~ /0x%[\*\d\.\$\Llzth]*[udi]/) {
- ERROR("PRINTF_0xDECIMAL",
+ # check for %Z
+ if ($show_Z && $string =~ /%[\*\d\.\$]*Z([diouxX])/) {
+ WARN("PRINTF_Z",
+ "%Z$1 is non-standard C, use %z$1\n" . $herecurr);
+ $show_Z = 0;
+ }
+ # check for 0x<decimal>
+ if ($string =~ /0x%[\*\d\.\$\Llzth]*[diou]/) {
+ ERROR("PRINTF_0XDECIMAL",
"Prefixing 0x with decimal output is defective\n" . $herecurr);
}
}