source: trunk/minix/commands/scripts/DESCRIBE.sh@ 15

#!/bin/sh
#
# DESCRIBE 2.2 - Describe the given devices.            Author: Kees J. Bot
#
# BUGS
# - Arguments may not contain shell metacharacters.

case $# in
0)      flag=; set -$- /dev ;;
*)      flag=d ;;
esac

ls -l$flag $* | \
sed     -e '/^total/d' \
        -e '/^[^bc]/s/.* /BAD BAD /' \
        -e '/^[bc]/s/.* \([0-9][0-9]*\), *\([0-9][0-9]*\).* /\1 \2 /' \
| {
ex=0    # exit code

while read major minor path
do
    case $path in
    /*) name=`expr $path : '.*/\\(.*\\)$'`
        ;;
    *)  name=$path
    esac
    dev= des=

    case $major in      # One of the controllers?  What is its controller nr?
    3)  ctrlr=0 ;;
    8)  ctrlr=1 ;;
    10) ctrlr=2 ;;
    12) ctrlr=3 ;;
    esac

    case $major,$minor in
    1,0)        des="RAM disk" dev=ram
        ;;
    1,1)        des="memory" dev=mem
        ;;
    1,2)        des="kernel memory" dev=kmem
        ;;
    1,3)        des="null device, data sink" dev=null
        ;;
    2,*)        drive=`expr $minor % 4`
        case `expr $minor - $drive` in
        0)      des='auto density' dev="fd$drive"
            ;;
        4)      des='360k, 5.25"' dev="pc$drive"
            ;;
        8)      des='1.2M, 5.25"' dev="at$drive"
            ;;
        12)     des='360k in 720k, 5.25"' dev="qd$drive"
            ;;
        16)     des='720k, 3.5"' dev="ps$drive"
            ;;
        20)     des='360k in 1.2M, 5.25"' dev="pat$drive"
            ;;
        24)     des='720k in 1.2M, 5.25"' dev="qh$drive"
            ;;
        28)     des='1.44M, 3.5"' dev="PS$drive"
            ;;
        112)    des='auto partition 0' dev="fd${drive}p0"
            ;;
        116)    des='auto partition 1' dev="fd${drive}p1"
            ;;
        120)    des='auto partition 2' dev="fd${drive}p2"
            ;;
        124)    des='auto partition 3' dev="fd${drive}p3"
            ;;
        *)      dev=BAD
        esac
        des="floppy drive $drive ($des)"
        ;;
    [38],[05]|[38],[123][05]|1[02],[05]|1[02],[123][05])
        drive=`expr $minor / 5`
        des="controller $ctrlr disk $drive" dev=c${ctrlr}d${drive}
        ;;
    [38],?|[38],[123]?|1[02],?|1[02],[123]?)
        drive=`expr $minor / 5`
        par=`expr $minor % 5 - 1`
        des="controller $ctrlr disk $drive partition $par"
        dev=c${ctrlr}d${drive}p${par}
        ;;
    [38],12[89]|[38],1[3-9]?|[38],2??|1[02],12[89]|1[02],1[3-9]?|1[02],2??)
        drive=`expr \\( $minor - 128 \\) / 16`
        par=`expr \\( \\( $minor - 128 \\) / 4 \\) % 4`
        sub=`expr \\( $minor - 128 \\) % 4`
        des="hard disk $drive, partition $par, subpartition $sub"
        des="controller $ctrlr disk $drive partition $par slice $sub"
        #par=`expr $drive '*' 5 + $par`
        dev=c${ctrlr}d${drive}p${par}s${sub}
        ;;
    [38],6[4-9]|[38],7?|1[02],6[4-9]|1[02],7?)
        tape=`expr \\( $minor - 64 \\) / 2`
        case $minor in
        *[02468])
            des="controller $ctrlr tape $tape (non-rewinding)"
            dev=c${ctrlr}t${tape}n
            ;;
        *[13579])
            des="controller $ctrlr tape $tape (rewinding)"
            dev=c${ctrlr}t${tape}
        esac
        ;;
    4,0)        des="console device" dev=console
        ;;
    4,[1-7])des="virtual console $minor" dev=ttyc$minor
        ;;
    4,15)       des="diagnostics device" dev=log
        ;;
    4,1[6-9])
        line=`expr $minor - 16`
        des="serial line $line" dev=tty0$line
        ;;
    4,12[89]|4,1[3-8]?|4,19[01])
        p=`expr \\( $minor - 128 \\) / 16 | tr '0123' 'pqrs'`
        n=`expr $minor % 16`
        test $n -ge 10 && n=`expr $n - 10 | tr '012345' 'abcdef'`
        des="pseudo tty `expr $minor - 128`" dev=tty$p$n
        ;;
    4,???)
        p=`expr \\( $minor - 192 \\) / 16 | tr '0123' 'pqrs'`
        n=`expr $minor % 16`
        test $n -ge 10 && n=`expr $n - 10 | tr '012345' 'abcdef'`
        des="controller of tty$p$n" dev=pty$p$n
        ;;
    5,0)        des="anonymous tty" dev=tty
        ;;
    6,0)        des="line printer, parallel port" dev=lp
        ;;
    7,*)
        d=`expr $minor % 8`
        n=`expr $minor / 8`
        case $d in
        0)  case $name in
            psip*)
                des="Pseudo IP #$n" dev=psip
                ;;
            *)  des="raw ethernet #$n" dev=eth
            esac
            ;;
        1)  des="raw IP #$n" dev=ip
            ;;
        2)  des="TCP/IP #$n" dev=tcp
            ;;
        3)  des="UDP #$n" dev=udp
        esac
        case $d in
        [0123])
            if [ "$name" = "$dev" ]
            then
                des="$des (default)"
            else
                dev=$dev$n
            fi
        esac
        ;;
    13,0)
        des="audio" dev=audio
        ;;
    14,0)
        des="audio mixer" dev=mixer
        ;;
    BAD,BAD)
        des= dev=
        ;;
    *)  dev=BAD
    esac

    case $name:$dev in
    *:)
        echo "$path: not a device" >&2
        ex=1
        ;;
    *:*BAD*)
        echo "$path: cannot describe: major=$major, minor=$minor" >&2
        ex=1
        ;;
    $dev:*)
        echo "$path: $des"
        ;;
    *:*)        echo "$path: nonstandard name for $dev: $des"
    esac
done

exit $ex
}