# Detect instances of "if (p) free (p);".
# Likewise for "if (p != NULL) free (p);". And with braces.
-my $VERSION = '2008-02-10 16:09'; # UTC
+my $VERSION = '2008-04-29 17:55'; # UTC
# The definition above must lie within the first 8 lines in order
# for the Emacs time-stamp write hook (at end) to update it.
# If you change this file with Emacs, please let the write hook
# Written by Jim Meyering
-# Exit status is like grep: 0 for no match. 1 for any number.
-# Note: giving line numbers isn't practical, since I've reset the
-# input record separator.
use strict;
use warnings;
use Getopt::Long;
(my $ME = $0) =~ s|.*/||;
+# use File::Coda; # http://meyering.net/code/Coda/
+END {
+ defined fileno STDOUT or return;
+ close STDOUT and return;
+ warn "$ME: failed to close standard output: $!\n";
+ $? ||= 1;
+}
+
sub usage ($)
{
my ($exit_code) = @_;
OPTIONS:
+ --list print only the name of each matching FILE (\0-terminated)
--name=N add name N to the list of `free'-like functions to detect;
may be repeated
--help display this help and exit
--version output version information and exit
+Exit status:
+
+ 0 no match
+ 1 one or more matches
+ 2 an error
+
EXAMPLE:
For example, this command prints all removable "if" tests before "free"
}
{
+ sub EXIT_MATCH {0}
+ sub EXIT_NO_MATCH {1}
+ sub EXIT_ERROR {2}
+ my $err = EXIT_NO_MATCH;
+
+ my $list;
my @name = qw(free);
GetOptions
(
help => sub { usage 0 },
version => sub { print "$ME version $VERSION\n"; exit },
+ list => \$list,
'name=s@' => \@name,
) or usage 1;
# Make sure we have the right number of non-option arguments.
# Always tell the user why we fail.
@ARGV < 1
- and (warn "$ME: missing FILE argument\n"), usage 1;
+ and (warn "$ME: missing FILE argument\n"), usage EXIT_ERROR;
my $or = join '|', @name;
my $regexp = qr/(?:$or)/;
# Set the input record separator.
+ # Note: this makes it impractical to print line numbers.
$/ = '"';
my $found_match = 0;
+ FILE:
foreach my $file (@ARGV)
{
open FH, '<', $file
- or die "$ME: can't open `$file' for reading: $!\n";
+ or (warn "$ME: can't open `$file' for reading: $!\n"),
+ $err = EXIT_ERROR, next;
while (defined (my $line = <FH>))
{
if ($line =~
/\b(if\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)
- (?: \s*$regexp\s*\(\s*\2\s*\)|
- \s*\{\s*$regexp\s*\(\s*\2\s*\)\s*;\s*\}))/sx)
+ (?: \s*$regexp\s*\((?:\s*\([^)]+\))?\s*\2\s*\)|
+ \s*\{\s*$regexp\s*\((?:\s*\([^)]+\))?\s*\2\s*\)\s*;\s*\}))/sx)
{
- print "$file: $1\n";
$found_match = 1;
+ $list
+ and (print "$file\0"), next FILE;
+ print "$file: $1\n";
}
}
+ }
+ continue
+ {
close FH;
}
- exit !$found_match;
+
+ $found_match && $err == EXIT_NO_MATCH
+ and $err = EXIT_MATCH;
+
+ exit $err;
}
my $foo = <<'EOF';
git ls-files -z |xargs -0 \
perl -0x3b -pi -e 's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)\s+(k?free\s*\(\s*\1\s*\))/$2/s'
+useless-if-before-free -l $(lid -knone free) | xargs -0 \
+ perl -0x3b -pi -e \
+ 's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)\s+(free\s*\(\s*\1\s*\))/$2/s'
+
Be careful that the result of the above transformation is valid.
If the matched string is followed by "else", then obviously, it won't be.