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|
#!/usr/bin/perl -w
# Derive #define directives from specially formatted `case ...:' statements.
use strict;
use Getopt::Long;
(my $VERSION = '$Revision: 1.4 $ ') =~ tr/[0-9].//cd;
(my $ME = $0) =~ s|.*/||;
END
{
# Nobody ever checks the status of print()s. That's okay, because
# if any do fail, we're guaranteed to get an indicator when we close()
# the filehandle.
#
# Close stdout now, and if there were no errors, return happy status.
# If stdout has already been closed by the script, though, do nothing.
defined fileno STDOUT
or return;
close STDOUT
and return;
# Errors closing stdout. Indicate that, and hope stderr is OK.
warn "$ME: closing standard output: $!\n";
# Don't be so arrogant as to assume that we're the first END handler
# defined, and thus the last one invoked. There may be others yet
# to come. $? will be passed on to them, and to the final _exit().
#
# If it isn't already an error, make it one (and if it _is_ an error,
# preserve the value: it might be important).
$? ||= 1;
}
sub usage ($)
{
my ($exit_code) = @_;
my $STREAM = ($exit_code == 0 ? *STDOUT : *STDERR);
if ($exit_code != 0)
{
print $STREAM "Try `$ME --help' for more information.\n";
}
else
{
print $STREAM <<EOF;
Usage: $ME [OPTIONS] FILE
FIXME: describe
OPTIONS:
Derive #define directives from specially formatted `case ...:' statements.
--help display this help and exit
--version output version information and exit
EOF
}
exit $exit_code;
}
{
GetOptions
(
help => sub { usage 0 },
version => sub { print "$ME version $VERSION\n"; exit },
) or usage 1;
my $fail = 0;
@ARGV < 1
and (warn "$ME: missing FILE arguments\n"), $fail = 1;
1 < @ARGV
and (warn "$ME: too many arguments\n"), $fail = 1;
$fail
and usage 1;
my $file = $ARGV[0];
open FH, $file
or die "$ME: can't open `$file' for reading: $!\n";
# For each line like this:
# case S_MAGIC_ROMFS: /* 0x7275 */
# emit one like this:
# # define S_MAGIC_ROMFS 0x7275
# Fail if there is a `case S_MAGIC_.*' line without
# a properly formed comment.
print <<EOF;
/* Define the magic numbers as given by statfs(2).
Please send additions to bug-coreutils\@gnu.org and meskes\@debian.org.
This file is generated automatically from $file. */
#if defined __linux__
EOF
while (defined (my $line = <FH>))
{
$line =~ /^[ \t]+case S_MAGIC_/
or next;
$line =~ m!^[ \t]+case (S_MAGIC_\w+): /\* (0x[0-9A-Fa-f]+) \*/$!
or (warn "$ME:$file:$.: malformed case S_MAGIC_... line"),
$fail = 1, next;
my $name = $1;
my $value = $2;
print "# define $name $value\n";
}
print <<\EOF;
#elif defined __GNU__
# include <hurd/hurd_types.h>
#endif
EOF
close FH;
exit $fail;
}
|
