package common; use diagnostics; use strict; use vars qw(@ISA %EXPORT_TAGS @EXPORT_OK $printable_chars $sizeof_int $bitof_int $cancel $SECTORSIZE); @ISA = qw(Exporter); %EXPORT_TAGS = ( common => [ qw(min max bool member divide is_empty_array_ref round_up round_down first top) ], file => [ qw(dirname basename all glob_ cat_ chop_ mode) ], system => [ qw(sync makedev unmakedev psizeof strcpy gettimeofday syscall_ crypt_) ], constant => [ qw($printable_chars $sizeof_int $bitof_int $SECTORSIZE) ], ); @EXPORT_OK = map { @$_ } values %EXPORT_TAGS; $printable_chars = "\x20-\x7E"; $sizeof_int = psizeof("i"); $bitof_int = $sizeof_int * 8; $SECTORSIZE = 512; 1; sub min { my $min = shift; grep { $_ < $min and $min = $_; } @_; $min } sub max { my $max = shift; grep { $_ > $max and $max = $_; } @_; $max } sub first { $_[0] } sub top { $_[$#_] } sub member { my $e = shift; foreach (@_) { $e eq $_ and return 1 } 0 } sub dirname { @_ == 1 or die "usage: dirname \n"; local $_ = shift; s|[^/]*/*\s*$||; s|(.)/*$|$1|; $_ || '.' } sub basename { @_ == 1 or die "usage: basename \n"; local $_ = shift; s|/*\s*$||; s|.*/||; $_ } sub bool { $_[0] ? 1 : 0 } sub strcpy { substr($_[0], $_[2] || 0, length $_[1]) = $_[1] } sub cat_ { local *F; open F, $_[0] or $_[1] ? die "cat of file $_[0] failed: $!\n" : return; my @l = ; @l } sub chop_ { map { my $l = $_; chomp $l; $l } @_ } sub divide { my $d = int $_[0] / $_[1]; wantarray ? ($d, $_[0] % $_[1]) : $d } sub round_up { my ($i, $r) = @_; $i += $r - ($i + $r - 1) % $r - 1; } sub round_down { my ($i, $r) = @_; $i -= $i % $r; } sub is_empty_array_ref { my $a = shift; !defined $a || @$a == 0 } sub sync { syscall_('sync') } sub gettimeofday { my $t = pack "LL"; syscall_('gettimeofday', $t, 0) or die "gettimeofday: $!\n"; unpack("LL", $t) } sub remove_spaces { local $_ = shift; s/^ +//; s/ +$//; $_ } sub mode { my @l = stat $_[0] or die "unable to get mode of file $_[0]: $!\n"; $l[2] } sub psizeof { length pack $_[0] } sub all { my $d = shift; local *F; opendir F, $d or die "all: can't opendir $d: $!\n"; grep { $_ ne '.' && $_ ne '..' } readdir F; } sub glob_ { my ($d, $f) = ($_[0] =~ /\*/) ? (dirname($_[0]), basename($_[0])) : ($_[0], '*'); $d =~ /\*/ and die "glob_: wildcard in directory not handled ($_[0])\n"; ($f = quotemeta $f) =~ s/\\\*/.*/g; $d =~ m|/$| or $d .= '/'; map { $d eq './' ? $_ : "$d$_" } grep { /$f/ } all($d); } sub syscall_ { my $f = shift; require 'syscall.ph'; syscall(&{$common::{"SYS_$f"}}, @_) == 0; } sub crypt_ { local $_ = (gettimeofday())[1] % 0x40; tr [\0-\x3f] [0-9a-zA-Z./]; crypt($_[0], $_) } sub makedev { ($_[0] << 8) | $_[1] } sub unmakedev { $_[0] >> 8, $_[0] & 0xff }