#define DEFINE_FUNC_ATTRIBUTES
#include "nvim/func_attr.h"
#undef DEFINE_FUNC_ATTRIBUTES
static OptInt get_undolevel(buf_T *buf);
static inline void zero_fmark_additional_data(fmark_T *fmarks);
static void corruption_error(const char *const mesg, const char *const file_name) FUNC_ATTR_NONNULL_ALL;
static void u_free_uhp(u_header_T *uhp);
static _Bool serialize_header(bufinfo_T *bi, uint8_t *hash) FUNC_ATTR_NONNULL_ALL;
static _Bool serialize_uhp(bufinfo_T *bi, u_header_T *uhp);
static u_header_T *unserialize_uhp(bufinfo_T *bi, const char *file_name);
static _Bool serialize_extmark(bufinfo_T *bi, ExtmarkUndoObject extup);
static ExtmarkUndoObject *unserialize_extmark(bufinfo_T *bi, _Bool *error, const char *filename);
static _Bool serialize_uep(bufinfo_T *bi, u_entry_T *uep);
static u_entry_T *unserialize_uep(bufinfo_T *bi, _Bool *error, const char *file_name);
static void serialize_pos(bufinfo_T *bi, pos_T pos);
static void unserialize_pos(bufinfo_T *bi, pos_T *pos);
static void serialize_visualinfo(bufinfo_T *bi, visualinfo_T *info);
static void unserialize_visualinfo(bufinfo_T *bi, visualinfo_T *info);
static _Bool undo_write(bufinfo_T *bi, uint8_t *ptr, size_t len) FUNC_ATTR_NONNULL_ARG(1);
static _Bool undo_write_bytes(bufinfo_T *bi, uintmax_t nr, size_t len);
static void put_header_ptr(bufinfo_T *bi, u_header_T *uhp);
static int undo_read_4c(bufinfo_T *bi);
static int undo_read_2c(bufinfo_T *bi);
static int undo_read_byte(bufinfo_T *bi);
static time_t undo_read_time(bufinfo_T *bi);
static _Bool undo_read(bufinfo_T *bi, uint8_t *buffer, size_t size) FUNC_ATTR_NONNULL_ARG(1);
static char *undo_read_string(bufinfo_T *bi, size_t len);
static void u_doit(int startcount, _Bool quiet, _Bool do_buf_event);
static void u_undoredo(_Bool undo, _Bool do_buf_event);
static void u_undo_end(_Bool did_undo, _Bool absolute, _Bool quiet);
static void u_unch_branch(u_header_T *uhp);
static u_entry_T *u_get_headentry(buf_T *buf);
static void u_getbot(buf_T *buf);
static void u_freeheader(buf_T *buf, u_header_T *uhp, u_header_T **uhpp);
static void u_freebranch(buf_T *buf, u_header_T *uhp, u_header_T **uhpp);
static void u_freeentries(buf_T *buf, u_header_T *uhp, u_header_T **uhpp);
static void u_freeentry(u_entry_T *uep, int n);
static char *u_save_line(linenr_T lnum);
static char *u_save_line_buf(buf_T *buf, linenr_T lnum);
static list_T *u_eval_tree(buf_T *const buf, const u_header_T *const first_uhp) FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_RET;
#define DEFINE_EMPTY_ATTRIBUTES
#include "nvim/func_attr.h"  // IWYU pragma: export