#!/bin/sh -efu
# This file is covered by the GNU General Public License,
# which should be included with libshell as the file LICENSE.
# All copyright information are listed in the COPYING.

if [ -z "${__included_shell_cmdline-}" ]; then
__included_shell_cmdline=1

. shell-string

# Run handler for each variable in /proc/cmdline.
#
cmdline_foreach() {
	local l="$1" h="$2"
	local c= m=

	__is_set() {
		[ $(( $1 & $2 )) -eq $2 ]
	}

	fill_mask m "$l"

	local state=$((0x00))
	local VALUE=$((0x02))
	local EQUAL=$((0x04))
	local QUOTE=$((0x10))

	local n= v=

	while [ -n "$l" ]; do
		c="${l%$m}"

		case "$c" in
			'"')
				__is_set $state $QUOTE &&
					state=$(($state ^ $QUOTE)) ||
					state=$(($state | $QUOTE))
				;;
			' ')
				if __is_set $state $QUOTE; then
					v="$v$c"
				else
					__is_set $state $EQUAL ||
						v=1
					$h "$n" "$v" ||
						break
					n= v=
					state=$((0x00))
				fi
				;;
			'=')
				! __is_set $state $VALUE ||
					v="$v$c"
				state=$(($state | $VALUE | $EQUAL))
				;;
			*)
				if ! __is_set $state $VALUE; then
					[ "$c" != '-' ] || c='_'
					n="$n$c"
				else
					v="$v$c"
				fi
				;;
		esac

		l="${l#?}"
		m="${m#?}"
	done
	unset __is_set
}

# Find spicified variable in /proc/cmdline and store result into variable.
#
# Usage example:
# read cmdline < /proc/cmdline
# cmdline_get "$cmdline" 'initrd_value' 'initrd'
# echo "$initrd_value"
cmdline_get() {
	local s="$1" retv="$2" getn="$3"
	__getval() {
		if [ "$1" = "$getn" ]; then
			eval "$retv=\"$2\""
			return 1
		fi
	}
	cmdline_foreach "$s" __getval
	unset __getval
}

fi #__included_shell_cmdline