#!/usr/bin/perl -T

# $AFresh1: perl_strmode.pl,v 1.5 2011/03/28 02:38:52 andrew Exp $
#
# Copyright (c) 2011 Andrew Fresh <andrew@afresh1.com>
# Copyright (c) 1990 The Regents of the University of California.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of the University nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

use warnings;
use strict;
use 5.010;

use Fcntl ':mode';

sub strmode {

    # Perl port of OpenBSD: lib/libc/string/strmode.c,v 1.7
    # by Andrew Fresh <andrew@afresh1.com>

    my ($mode) = @_;
    my $p = '';

    # print type
    given ( $mode & S_IFMT ) {
        when (S_IFDIR)  { $p .= 'd' }    # directory
        when (S_IFCHR)  { $p .= 'c' }    # character special
        when (S_IFBLK)  { $p .= 'b' }    # block special
        when (S_IFREG)  { $p .= '-' }    # regular
        when (S_IFLNK)  { $p .= 'l' }    # symbolic link
        when (S_IFSOCK) { $p .= 's' }    # socket
#ifdef S_IFIFO XXX How important is this? Is S_IFIFO ever not set?
        when (S_IFIFO) { $p .= 'p' }     # fifo
#endif
        default { $p .= '?' }            # unknown
    }

    # usr
    $p .= ( $mode & S_IRUSR ) ? 'r' : '-';
    $p .= ( $mode & S_IWUSR ) ? 'w' : '-';
    given ( $mode & ( S_IXUSR | S_ISUID ) ) {
        when (0)                   { $p .= '-' }
        when (S_IXUSR)             { $p .= 'x' }
        when (S_ISUID)             { $p .= 'S' }
        when ( S_IXUSR | S_ISUID ) { $p .= 's' }
    }

    # group
    $p .= ( $mode & S_IRGRP ) ? 'r' : '-';
    $p .= ( $mode & S_IWGRP ) ? 'w' : '-';
    given ( $mode & ( S_IXGRP | S_ISGID ) ) {
        when (0)                   { $p .= '-' }
        when (S_IXGRP)             { $p .= 'x' }
        when (S_ISGID)             { $p .= 'S' }
        when ( S_IXGRP | S_ISGID ) { $p .= 's' }
    }

    # other
    $p .= ( $mode & S_IROTH ) ? 'r' : '-';
    $p .= ( $mode & S_IWOTH ) ? 'w' : '-';
    given ( $mode & ( S_IXOTH | S_ISVTX ) ) {
        when (0)                   { $p .= '-' }
        when (S_IXOTH)             { $p .= 'x' }
        when (S_ISVTX)             { $p .= 'T' }
        when ( S_IXOTH | S_ISVTX ) { $p .= 't' }
    }
    $p .= ' ';    # will be a '+' if ACL's implemented

    return $p;
}

my @files = @ARGV;
@files = '.' unless @files;

foreach my $file (@files) {
    my ( $mode, $nlink, $uid, $gid, $size, $mtime )
        = ( lstat($file) )[ 2 .. 5, 7, 9 ]
            or next;

    my $time = localtime($mtime);
    $time =~ s/^\w+\s+//;

    printf "%s %2s %-7s %-7s %8d %s %s\n",
        strmode($mode),
        $nlink,
        ( getpwuid($uid) )[0],
        ( getgrgid($gid) )[0],
        $size, $time, $file;
}