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##########################################################################
# Shellscript:	uncpio - unpack cpio file
# Version    :	0.3 (beta)
# Author     :	Heiner Steven (heiner.steven@odn.de)
# Date	     :	23-09-94
# Category   :	File Utilities
# SCCS-Id.   :	$Id: uncpio,v 1.1.1.1 1999/06/15 19:29:05 heiner Exp $
##########################################################################
# Description
#
# Notes
#	needs icat
#
# Changes
# 17-11-94 stv	changed algorithm to detect file name (0.2)
#		new parameters -u, -v
# 19-01-95 stv	Program uses "icat", if needed (0.3)
##########################################################################

PN=`basename $0`			# program name
VER='0.3 (beta)'

Usage () {
    echo >&2 "$PN - unarchive cpio archive, $VER (stv '95)
usage: $PN [-vu] [archive...]
    -v    print extracted file names
    -u    unconditionally overwrite existing files

If the specified archive does not exist, the files
    archive.cpz, archive.cpio

and compressed versions of archive.cpio are also tried."
    exit 1
}

Msg () {
    for i
    do echo "$PN: $i" >&2
    done
}

Fatal () { Msg "$@"; exit 1; }

set -- `getopt huv "$@"`
CpioOpt=dm				# Options for cpio
while [ $# -gt 0 ]
do
    case "$1" in
	-h)	Usage;;
	-v)	CpioOpt="${CpioOpt}v";;
	-u)	CpioOpt="${CpioOpt}u";;
	--)	shift; break;;
	-*)	Usage;;
	*)	break;;			# File name
    esac
    shift
done

Err=0
if [ $# -lt 1 ]
then					# read from stdin -- uncompressed
    cpio -i$CpioOpt || Fatal "error extracting from standard input"
else
    for file in $*			# no blanks permitted in file name
    do
	if [ -f "$file" -a -r "$file" ]
	then				# file exists
	    # If input is no cpio-archive, try 'icat' to
	    # uncompress input
	    echo "$file -	\c" >&2
	    cpio -i$CpioOpt < "$file" 2> /dev/null || 
		icat "$file" | cpio -i$CpioOpt
	elif [ -f "$file.cpio" -a -r "$file.cpio" ]
	then
	    cpio -i$CpioOpt < $file.cpio
	elif [ -f "$file.cpz" -a -r "$file.cpz" ]
	then				# compressed
	    echo "$file.cpz -	\c" >&2
	    uncompress < $file.cpz | cpio -i$CpioOpt
	elif [ -n "`ls $file.cpio.* 2> /dev/null`" ]
	then
	    icat $file.cpio.* | cpio -i$CpioOpt
	else
	    Msg "$file not found - ignored"
	    Err=`expr $Err + 1`
	fi
    done
fi
exit $Err