#!/bin/sh -e

# make_h_tree
# Generate an h tree that includes the appropriate sys headers
#
# Usage: make_h_tree ${SRC} ...
#
# The source files in the specified directories will be scanned for include
# directives. The h directory will be created under the current directory and
# populated with stubs that include the actual header file for every header
# included by any source file in the ${SRC} directories. Since this script is
# for userspace only, this effectively just makes a file called h/foo.h that
# contains:
#    #include <sys/foo.h>
# For every include directive that is found that looks like #include <h/foo.h>
# This is an ugly hack to work around the naming of header files using h
# instead of their proper names elsewhere in the code.

mkdir h

for dir in "$@" ; do
  for hsrc in `cat "$dir"/*.c | \
    sed -n -e 's|^[ 	]*#[ 	]*include[ 	]*[<"]h/\([^>"/]*\)[>"].*$|\1|p' | \
      sort | uniq` ; do

    echo "#include <sys/$hsrc>" > h/"$hsrc"
  done
done