1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
#!/usr/bin/perl -w
# Derive #define directives from specially formatted 'case ...:' statements.
# Copyright (C) 2003-2020 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;
}
|
