diff options
Diffstat (limited to 'src/extract-magic')
| -rw-r--r-- | src/extract-magic | 48 |
1 files changed, 38 insertions, 10 deletions
diff --git a/src/extract-magic b/src/extract-magic index 6bc054f50..57d3681ae 100644 --- a/src/extract-magic +++ b/src/extract-magic @@ -65,10 +65,15 @@ FIXME: describe OPTIONS: - Derive #define directives from specially formatted `case ...:' statements. + 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. - --help display this help and exit - --version output version information and exit + --local emit an is_local_fs_type function + --help display this help and exit + --version output version information and exit EOF } @@ -76,8 +81,12 @@ EOF } { + # 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; @@ -103,31 +112,50 @@ EOF # Fail if there is a `case S_MAGIC_.*' line without # a properly formed comment. - print <<EOF; + 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. */ - -#if defined __linux__ EOF + print $emit_magic ? $magic_comment : $map_comment; + + $emit_magic + and print "\n#if defined __linux__\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; - $line =~ m!^[ \t]+case (S_MAGIC_\w+): /\* (0x[0-9A-Fa-f]+) \*/$! + $line =~ + m!^[ \t]+case (S_MAGIC_\w+): /\* (0x[0-9A-Fa-f]+) (local|remote) \*/! or (warn "$ME:$file:$.: malformed case S_MAGIC_... line"), $fail = 1, next; my $name = $1; - my $value = $2; - print "# define $name $value\n"; + my $magic = $2; + my $local = $3 eq 'local' ? 1 : 0; + print $emit_magic + ? "# define $name $magic\n" + : " case $name: return $local;\n"; } - print <<\EOF; + $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; |