interpret/src/journal.h

#ifndef JOURNAL_H
#define JOURNAL_H

#include <stdint.h> /* uint32_t C99 */
/** Assumes: reverse ordering of byte-fields; unsigned is defined; C11 or GNU
 anonymous unions. */
union date32 {
	struct { uint32_t day : 5, month : 4, year : 23; }; /* C11, reverse */
	uint32_t u32;
};
void date32_to_string(const union date32 d, char (*const a)[12]);
union line64 {
	struct { uint32_t line; union date32 date; };  /* C11, little-endian */
	uint64_t u64; /* C99 optional */
};

#define TREE_NAME day
#define TREE_KEY union date32
#define TREE_VALUE const char *
#define TREE_HEAD
#include "../src/tree.h"

union date32 date32_last_month(union date32 d);
union date32 date32_next_month(union date32 d);
#include "text.h"
struct journal { struct day_tree days; struct char_array backing; };
struct journal_iterator { struct day_tree_iterator _; };
struct journal journal(void);
void journal_(struct journal *);
int journal_is_empty(const struct journal *);
const char *journal_to_string(const struct journal *);
struct journal_iterator journal_iterator(struct journal *const j);
int journal_next(struct journal_iterator *, union date32 *, const char **);

#endif /* JOURNAL_H */