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#!/usr/bin/perl -w
# Derive #define directives from specially formatted 'case ...:' statements.
# Copyright (C) 2003-2022 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
use strict;
use Getopt::Long;
(my $VERSION = '$Revision: 1.5 $ ') =~ 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:
There are two modes of operation, the default, which is to emit
#define directives derived from specially formatted 'case' statements,
and that with --local, which is to emit a static inline function
mapping S_MAGIC_* values to 1, 0, -1, corresponding to known-local,
known-remote/distributed/network and unknown, respectively.
--local emit an is_local_fs_type function
--help display this help and exit
--version output version information and exit
EOF
}
exit $exit_code;
}
{
# The default is to print S_MAGIC_* definitions.
my $emit_magic = 1;
GetOptions
(
local => sub { $emit_magic = 0 },
help => sub { usage 0 },
version => sub { print "$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.
my $map_comment = <<EOF;
/* Map each S_MAGIC_* value to 1, 0 or -1.
1 if it is known to be a remote file system type,
0 if it is known to be a local file system type, or -1 otherwise. */
EOF
my $magic_comment = <<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. */
EOF
print $emit_magic ? $magic_comment : $map_comment;
$emit_magic
and print "\n#if defined __linux__ || defined __ANDROID__\n";
$emit_magic
or print "static inline int\n"
. "is_local_fs_type (unsigned long int magic)\n"
. "{\n switch (magic)\n {\n";
while (defined (my $line = <FH>))
{
$line =~ /^[ \t]+case S_MAGIC_/
or next;
$line =~
m!^[ \t]+case (S_MAGIC_\w+): /\* (0x[0-9A-Fa-f]+) (local|remote) \*/!
or (warn "$ME:$file:$.: malformed case S_MAGIC_... line"),
$fail = 1, next;
my $name = $1;
my $magic = $2;
my $local = $3 eq 'local' ? 1 : 0;
print $emit_magic
? "# define $name $magic\n"
: " case $name: return $local;\n";
}
$emit_magic
and print <<\EOF;
#elif defined __GNU__
# include <hurd/hurd_types.h>
#endif
EOF
$emit_magic
or printf " default: return -1;\n }\n}\n";
close FH;
exit $fail;
}
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