/* See LICENSE file for copyright and license details. */
#include <sys/mount.h>
#include <pthread.h>
#include <libsimple.h>


#define NANOSECONDS(X) X##L
#define MICROSECONDS(X) NANOSECONDS(X##000)
#define MILLISECONDS(X) MICROSECONDS(X##000)
#define CENTISECONDS(X) MILLISECONDS(X##0)
#define DECISECONDS(X) CENTISECONDS(X##0)
#define WHOLE_SECOND DECISECONDS(10)


#define WRAVG_STEPS 5


enum direction {
	FORWARDS = 0,
	BACKWARDS = 1
};

struct span {
	off_t start;
	off_t end;
	off_t bad;
	size_t blocksize;
};

struct status {
	struct timespec now;
	off_t shredded;
	off_t bad_bytes;
	uintmax_t bad_writes;
	uintmax_t bad_sections;
	uintmax_t pass_nr;
	struct timespec last_success;
	enum direction direction;

	int write_average_i;
	struct timespec write_average_begin_times[WRAVG_STEPS];
	off_t write_average_amounts[WRAVG_STEPS];
};
#define STATUS_INIT {.pass_nr = 1, .last_success = {-1, 0}, .direction = FORWARDS}


/* deadshred.c */
extern struct status status;
extern _Atomic volatile sig_atomic_t exiting;


/* io.c */
off_t filesize(int fd, const char *fname);


/* fmt.c */
const char *humansize1000(off_t s, char *buf);
const char *humansize1024(off_t s, char *buf);
#if defined(__GNUC__)
__attribute__((__pure__))
#endif
off_t unhumansize(const char *s, char flag);
const char *durationstr(const struct timespec *dur, char *buf, int second_decimals);
const char *humanbytespersecond(double bytes_per_second, char *buf);


/* text.c */
int have_micro_symbol(void);


/* avg.c */
void wravg_init(const struct timespec *start_time, struct status *s);
void wravg_update_write(ssize_t amount, struct status *s);
void wravg_update_time(struct status *s);
const char *wravg_get(struct status *s);


/* rnd.c */
#if defined(__GNUC__)
__attribute__((__const__))
#endif
size_t max_blksize(void);
void init_random(int fd, const char *fname);
const char *get_random(size_t needed);
void used_random(ssize_t amount);


/* sig.c */
void setup_sighandler(void);
void block_sigs(void);
void unblock_sigs(void);