From: Alexey Dobriyan <adobriyan@xxxxxxxxx> Subject: checkpatch: warn when formats use %Z and suggest %z vsnprintf extension %Z<foo> is non-standard C. Suggest the use of %z instead. Miscellanea: o 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. o Improve the mechanism to find these defects so all 3 current checks are done on the format string [joe@xxxxxxxxxxx: 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@xxxxxxxxxxx Link: http://lkml.kernel.org/r/20170109235955.GA6787@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx> Signed-off-by: Joe Perches <joe@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- scripts/checkpatch.pl | 27 +++++++++++++++++++-------- 1 file changed, 19 insertions(+), 8 deletions(-) diff -puN scripts/checkpatch.pl~checkpatchpl-warn-against-using-%z scripts/checkpatch.pl --- a/scripts/checkpatch.pl~checkpatchpl-warn-against-using-%z +++ a/scripts/checkpatch.pl @@ -1848,6 +1848,8 @@ my $prefix = ''; sub show_type { my ($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 @@ sub process { "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); } } _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
