/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation. See the file COPYING
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Copyright (C) 2017 Frank van Maarseveen <frankvm@frankvm.com>
 */

#ifndef _COMMON_H_
#define _COMMON_H_

#include <stddef.h>
#include <stdint.h>
#include <time.h>

typedef enum { false, true }	bool_t;
#define ARRAYSIZE(x)		(sizeof (x) / sizeof ((x)[0]))

/*
 * Cast a member of a structure out to the containing structure
 *
 * ptr:		the pointer to the member.
 * type:	the type of the container struct this is embedded in.
 * member:	the name of the member within the struct.
 *
 * Example:
 *
 *	struct foo {
 *		int		i;
 *		struct timer	t;
 *	};
 *
 *	void f(struct timer *p)
 *	{
 *		// when f() is called with the address of member
 *		// `t' of a struct foo then the following is permitted:
 *		struct foo *mydata = container_of(p, struct foo, t);
 *	}
 *
 */
#define container_of(ptr, type, member) \
	((type *)( (char *)(ptr) - offsetof(type, member) ))

extern const char *		me;
extern int			opt_v;
extern const struct timespec	TS_TIMESPEC_ZERO;

void			out(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
void			err(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
void			die(const char *fmt, ...) __attribute__((format(printf, 1, 2), noreturn));
void *			new(size_t size);
char *			newstr(const char *s);
char *			strip(char *p);
const char *		time2str(time_t t);
struct timespec		ts_get(const struct timespec *epoch);
void			ts_add(struct timespec *t1, const struct timespec *t2);
void			ts_addns(struct timespec *t, long ns);
void			ts_sub(struct timespec *t1, const struct timespec *t2);
bool_t			ts_after(const struct timespec *t1, const struct timespec *t2);

static inline bool_t ts_isset(const struct timespec *t)
{
	return t->tv_sec || t->tv_nsec;
}

static inline bool_t ts_after_or_equal(const struct timespec *t1, const struct timespec *t2)
{
	return !ts_after(t2, t1);
}

static inline bool_t ts_before(const struct timespec *t1, const struct timespec *t2)
{
	return ts_after(t2, t1);
}

static inline bool_t ts_before_or_equal(const struct timespec *t1, const struct timespec *t2)
{
	return !ts_after(t1, t2);
}

#endif