mirror of
git://git.sv.gnu.org/coreutils.git
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119 lines
2.8 KiB
Perl
119 lines
2.8 KiB
Perl
#!/usr/bin/perl -w
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# Derive #define directives from specially formatted `case ...:' statements.
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use strict;
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use Getopt::Long;
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(my $VERSION = '$Revision: 1.3 $ ') =~ tr/[0-9].//cd;
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(my $ME = $0) =~ s|.*/||;
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END
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{
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# Nobody ever checks the status of print()s. That's okay, because
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# if any do fail, we're guaranteed to get an indicator when we close()
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# the filehandle.
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#
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# Close stdout now, and if there were no errors, return happy status.
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# If stdout has already been closed by the script, though, do nothing.
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defined fileno STDOUT
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or return;
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close STDOUT
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and return;
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# Errors closing stdout. Indicate that, and hope stderr is OK.
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warn "$ME: closing standard output: $!\n";
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# Don't be so arrogant as to assume that we're the first END handler
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# defined, and thus the last one invoked. There may be others yet
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# to come. $? will be passed on to them, and to the final _exit().
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#
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# If it isn't already an error, make it one (and if it _is_ an error,
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# preserve the value: it might be important).
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$? ||= 1;
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}
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sub usage ($)
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{
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my ($exit_code) = @_;
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my $STREAM = ($exit_code == 0 ? *STDOUT : *STDERR);
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if ($exit_code != 0)
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{
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print $STREAM "Try `$ME --help' for more information.\n";
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}
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else
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{
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print $STREAM <<EOF;
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Usage: $ME [OPTIONS] FILE
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FIXME: describe
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OPTIONS:
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Derive #define directives from specially formatted `case ...:' statements.
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--help display this help and exit
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--version output version information and exit
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EOF
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}
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exit $exit_code;
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}
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{
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GetOptions
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(
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help => sub { usage 0 },
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version => sub { print "$ME version $VERSION\n"; exit },
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) or usage 1;
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my $fail = 0;
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@ARGV < 1
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and (warn "$ME: missing FILE arguments\n"), $fail = 1;
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1 < @ARGV
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and (warn "$ME: too many arguments\n"), $fail = 1;
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$fail
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and usage 1;
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my $file = $ARGV[0];
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open FH, $file
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or die "$ME: can't open `$file' for reading: $!\n";
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# For each line like this:
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# case S_MAGIC_ROMFS: /* 0x7275 */
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# emit one like this:
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# # define S_MAGIC_ROMFS 0x7275
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# Fail if there is a `case S_MAGIC_.*' line without
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# a properly formed comment.
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print <<EOF;
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/* Define the magic numbers as given by statfs(2).
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Please send additions to meskes\@debian.org.
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This file is generated automatically from $file. */
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#if defined __linux__
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EOF
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while (defined (my $line = <FH>))
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{
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$line =~ /^[ \t]+case S_MAGIC_/
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or next;
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$line =~ m!^[ \t]+case (S_MAGIC_\w+): /\* (0x[0-9A-Fa-f]+) \*/$!
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or (warn "$ME:$file:$.: malformed case S_MAGIC_... line"),
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$fail = 1, next;
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my $name = $1;
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my $value = $2;
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print "# define $name $value\n";
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}
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print <<\EOF;
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#elif defined __GNU__
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# include <hurd/hurd_types.h>
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#endif
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EOF
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close FH;
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exit $fail;
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}
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