/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __TC_EMATCH_H_

#define __TC_EMATCH_H_

#include <ctype.h>

#include <stdlib.h>

#include <string.h>

#include <limits.h>

#include "utils.h"

#include "tc_util.h"

#define EMATCHKINDSIZ 16

struct bstr {

	char	*data;

	unsigned int	len;

	int		quoted;

	struct bstr	*next;

};

struct bstr *bstr_alloc(const char *text);

static inline struct bstr *bstr_new(char *data, unsigned int len)

{

	struct bstr *b = calloc(1, sizeof(*b));

	if (b == NULL)

		return NULL;

	b->data = data;

	b->len = len;

	return b;

}

static inline int bstrcmp(const struct bstr *b, const char *text)

{

	int len = strlen(text);

	int d = b->len - len;

	if (d == 0)

		return strncmp(b->data, text, len);

	return d;

}

static inline struct bstr *bstr_next(struct bstr *b)

{

	return b->next;

}

unsigned long bstrtoul(const struct bstr *b);

struct ematch {

	struct bstr	*args;

	int		index;

	int		inverted;

	int		relation;

	int		child_ref;

	struct ematch	*child;

	struct ematch	*next;

};

static inline struct ematch *new_ematch(struct bstr *args, int inverted)

{

	struct ematch *e = calloc(1, sizeof(*e));

	if (e == NULL)

		return NULL;

	e->args = args;

	e->inverted = inverted;

	return e;

}

void print_ematch_tree(const struct ematch *tree);

struct ematch_util {

	char			kind[EMATCHKINDSIZ];

	int			kind_num;

	int	(*parse_eopt)(struct nlmsghdr *, struct tcf_ematch_hdr *,

			      struct bstr *);

	int	(*parse_eopt_argv)(struct nlmsghdr *, struct tcf_ematch_hdr *,

				   int, char **);

	int	(*print_eopt)(FILE *, struct tcf_ematch_hdr *, void *, int);

	void	(*print_usage)(FILE *);

	struct ematch_util	*next;

};

static inline int parse_layer(const struct bstr *b)

{

	if (*((char *) b->data) == 'l')

		return TCF_LAYER_LINK;

	else if (*((char *) b->data) == 'n')

		return TCF_LAYER_NETWORK;

	else if (*((char *) b->data) == 't')

		return TCF_LAYER_TRANSPORT;

	else

		return INT_MAX;

}

__attribute__((format(printf, 5, 6)))

int em_parse_error(int err, struct bstr *args, struct bstr *carg,

		   struct ematch_util *, char *fmt, ...);

int print_ematch(FILE *, const struct rtattr *);

int parse_ematch(int *, char ***, int, struct nlmsghdr *);

#endif