#!/bin/sh
# See LICENSE file for copyright and license details.

set -e

test $# -ge 1

lowercase () { printf '%s\n' "$*" | tr '[A-Z]' '[a-z]'; }

symbols="$(lowercase "$1")"
shift 1

validate () {
	if (( -$1 > 0x7FFF )) || (( +$1 > 0x7FFF )); then
		printf 'Invalid enum value: %s = %x (beyond 16-bit signed integer)\n' $2 $1 >&2
		return 1
	else
		return 0
	fi
}

printf	'static const char *\n'
printf	'extract_symbol_%s(struct libsyscalls_symbol_printer_data *data, ' "$symbols"
printf                    'unsigned long long int *valuep, char *fallback_out) /* 1 */\n'
printf	'{\n'
printf	'	const char *ret;\n'
printf	'	switch ((signed long long int)*valuep) {\n'
while read name value; do
validate $value $name
printf	'	case %i: ret = "%s"; break;\n' $value $name
done
printf	'	default:\n'
if test $# -ge 1; then
 for use; do
printf	'		if ((ret = extract_symbol_%s(data, valuep, fallback_out))) return ret;\n' "$(lowercase "$use")"
 done
fi
printf	'		return NULL;\n'
printf	'	}\n'
printf	'	*valuep = 0;\n'
if test $# = 0; then
printf	'	(void) data;\n'
printf	'	(void) fallback_out;\n'
fi
printf	'	return ret;\n'
printf	'}\n'