#!/bin/sh
  # SPDX-License-Identifier: GPL-2.0-only
  #
  # Generate a syscall table header.
  #
  # Each line of the syscall table should have the following format:
  #
  # NR ABI NAME [NATIVE] [COMPAT]
  #
  # NR       syscall number
  # ABI      ABI name
  # NAME     syscall name
  # NATIVE   native entry point (optional)
  # COMPAT   compat entry point (optional)
  
  set -e
  
  usage() {
  	echo >&2 "usage: $0 [--abis ABIS] INFILE OUTFILE" >&2
  	echo >&2
  	echo >&2 "  INFILE    input syscall table"
  	echo >&2 "  OUTFILE   output header file"
  	echo >&2
  	echo >&2 "options:"
  	echo >&2 "  --abis ABIS        ABI(s) to handle (By default, all lines are handled)"
  	exit 1
  }
  
  # default unless specified by options
  abis=
  
  while [ $# -gt 0 ]
  do
  	case $1 in
  	--abis)
  		abis=$(echo "($2)" | tr ',' '|')
  		shift 2;;
  	-*)
  		echo "$1: unknown option" >&2
  		usage;;
  	*)
  		break;;
  	esac
  done
  
  if [ $# -ne 2 ]; then
  	usage
  fi
  
  infile="$1"
  outfile="$2"
  
  nxt=0

  grep -E "^[0-9]+[[:space:]]+$abis" "$infile" | {

  
  	while read nr abi name native compat ; do

  		if [ $nxt -gt $nr ]; then
  			echo "error: $infile: syscall table is not sorted or duplicates the same syscall number" >&2
  			exit 1
  		fi

  		while [ $nxt -lt $nr ]; do
  			echo "__SYSCALL($nxt, sys_ni_syscall)"
  			nxt=$((nxt + 1))
  		done
  
  		if [ -n "$compat" ]; then
  			echo "__SYSCALL_WITH_COMPAT($nr, $native, $compat)"
  		elif [ -n "$native" ]; then
  			echo "__SYSCALL($nr, $native)"
  		else
  			echo "__SYSCALL($nr, sys_ni_syscall)"
  		fi
  		nxt=$((nr + 1))
  	done
  } > "$outfile"