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#! /bin/bash -x

# extracts .config info from a [b]zImage file

# uses: binoffset (new), dd, zcat, strings, grep

# $arg1 is [b]zImage filename

HDR=`binoffset $1 0x1f 0x8b 0x08 0x0`

PID=$$

TMPFILE="$1.vmlin.$PID"

# dd if=$1 bs=1 skip=$HDR | zcat - | strings /dev/stdin \

# | grep "[A-Za-z_0-9]=[ynm]$" | sed "s/^/CONFIG_/" > $1.oldconfig.$PID

# exit

dd if=$1 bs=1 skip=$HDR | zcat - > $TMPFILE

strings $TMPFILE | grep "^[\#[:blank:]]*CONFIG_[A-Za-z_0-9]*" > $1.oldconfig.$PID

wc $1.oldconfig.$PID

rm $TMPFILE