#!/bin/sh
  # SPDX-License-Identifier: GPL-2.0
  
  if [ $# -lt 2 ]
  then
  	echo "Usage: headers_install.sh OUTDIR SRCDIR [FILES...]"
  	echo
  	echo "Prepares kernel header files for use by user space, by removing"
  	echo "all compiler.h definitions and #includes, removing any"
  	echo "#ifdef __KERNEL__ sections, and putting __underscores__ around"
  	echo "asm/inline/volatile keywords."
  	echo
  	echo "OUTDIR: directory to write each userspace header FILE to."
  	echo "SRCDIR: source directory where files are picked."
  	echo "FILES:  list of header files to operate on."
  
  	exit 1
  fi
  
  # Grab arguments
  
  OUTDIR="$1"
  shift
  SRCDIR="$1"
  shift
  
  # Iterate through files listed on command line
  
  FILE=
  trap 'rm -f "$OUTDIR/$FILE" "$OUTDIR/$FILE.sed"' EXIT
  for i in "$@"
  do
  	FILE="$(basename "$i")"
  	sed -r \
  		-e 's/([ \t(])(__user|__force|__iomem)[ \t]/\1/g' \
  		-e 's/__attribute_const__([ \t]|$)/\1/g' \
  		-e 's@^#include <linux/compiler(|_types).h>@@' \
  		-e 's/(^|[^a-zA-Z0-9])__packed([^a-zA-Z0-9_]|$)/\1__attribute__((packed))\2/g' \
  		-e 's/(^|[ \t(])(inline|asm|volatile)([ \t(]|$)/\1__\2__\3/g' \
  		-e 's@#(ifndef|define|endif[ \t]*/[*])[ \t]*_UAPI@#\1 @' \
  		"$SRCDIR/$i" > "$OUTDIR/$FILE.sed" || exit 1
  	scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__ "$OUTDIR/$FILE.sed" \
  		> "$OUTDIR/$FILE"
  	[ $? -gt 1 ] && exit 1
  	rm -f "$OUTDIR/$FILE.sed"
  done
  trap - EXIT