I've finally gotten 'cpio' into a shape where it could be useable. This version can archive and extract directories, sockets, FIFOs, devices, symlinks, and regular files. Supported options are -iot, -H FMT (which is a dummy right now). It only writes newc, and could read newc or newcrc. This does NOT implement -d, which essentially is equivalent to mkdir -p $(dirname $FILE) for every file that needs it. Hard links are not supported, though it would be easy to add them given a hash table or something like that. I also have not implemented the "<n> blocks" output on stderr. If desired, I can add it pretty simply. There is one assumption this makes: that the mode of a file, as mode_t, is bitwise equivalent to the mode as defined for the cpio format. This is true of Linux, but is not mandated by POSIX. If it is compiled for a system where that is false, the archives will not be portable.

#!/bin/sh

# Copyright 2006 Rob Landley <rob@landley.net>

# Dumb little utility function to print out the assembly dump of a single
# function, or list the functions so dumpable in an executable.  You'd think
# there would be a way to get objdump to do this, but I can't find it.

[ $# -lt 1 ] || [ $# -gt 2 ] && { echo "usage: showasm file function"; exit 1; }

[ ! -f $1 ] && { echo "File $1 not found"; exit 1; }

if [ $# -eq 1 ]
then
  objdump -d $1 | sed -n -e 's/^[0-9a-fA-F]* <\(.*\)>:$/\1/p'
  exit 0
fi

objdump -d $1 | sed -n -e '/./{H;$!d}' -e "x;/^.[0-9a-fA-F]* <$2>:/p"