#!/bin/sh

incpath='/usr/include'

if [ $# -lt 2 ]; then
    echo 'Usage: cppgrep regexp file ...'
    echo '  search C/C++ file + included headers for regexp'
    echo '  regexp = AWK style extended regular expression'
    echo '  environment: $DEFINES (-DXXX=YYY) and $INCPATH (-Ixx/yy/zz)'
    exit 1
fi

regexp=$1
level=''
shift

function do_grep {
    /lib/cpp $INCPATH $DEFINES -dD $1 |
       awk -v re=$regexp \
         '/^# [0-9]/ { gsub("\"", "", $3); fn=$3; }
	 { if (match($0, re)) {
	   if (fn!=cfn) { print "++++ " fn ":"; cfn=fn; }
	   print "---- " $0;}}'
}

function test_do_grep {
    echo inc=$INCPATH, def=$DEFINES
    /lib/cpp $INCPATH $DEFINES -dD $1 | grep '^# [0-9]'
}

if
    echo $1 | grep -q src/linux  ||
    echo $PWD | grep -q src/linux ||
    echo $PWD | grep -q hankwang/Linux 
then
    INCPATH="$INCPATH -I/usr/src/linux/include"
    DEFINES="$DEFINES -D__KERNEL__"
fi

for fn in $*; do
    do_grep $fn
done