Import: split process_imported_dives() function

Split the process_imported_dives() function in two:
1) process_imported_dives() processes the dives and generates
   a list of dives and trips to be added and removed.
2) add_imported_dives() calls process_imported_dives() and
   does the actual removal / addition of dives and trips.

The goal is to split preparation and actual work, to
make dive import undo-able.

The code adds extra checks to never merge into the same
dive twice, as this would lead to a double-free() bug.
This should in principle never happen, as dives that
compare equal according to is_same_dive() are merged
in the imported-dives list, but perhaps in some pathologival
corner-cases is_same_dive() turns out to be non-transitive.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2018-12-23 22:08:00 +01:00 committed by Dirk Hohndel
parent fd196f143a
commit 0249e12589
11 changed files with 215 additions and 200 deletions

View file

@ -1368,66 +1368,6 @@ int unsaved_changes()
return dive_list_changed;
}
/*
* When adding dives to the dive table, we try to renumber
* the new dives based on any old dives in the dive table.
*
* But we only do it if:
*
* - there are no dives in the dive table
*
* OR
*
* - the last dive in the old dive table was numbered
*
* - all the new dives are strictly at the end (so the
* "last dive" is at the same location in the dive table
* after re-sorting the dives.
*
* - none of the new dives have any numbers
*
* This catches the common case of importing new dives from
* a dive computer, and gives them proper numbers based on
* your old dive list. But it tries to be very conservative
* and not give numbers if there is *any* question about
* what the numbers should be - in which case you need to do
* a manual re-numbering.
*/
static void try_to_renumber(int preexisting)
{
int i, nr;
struct dive *last = get_dive(preexisting - 1);
/*
* If there was a last dive, but it didn't have
* a number, give up.
*/
if (last && !last->number)
return;
/*
* If any of the new dives already had a number,
* we'll have to do a manual renumbering.
*/
for (i = preexisting; i < dive_table.nr; i++) {
struct dive *dive = get_dive(i);
if (dive->number)
return;
}
/*
* Ok, renumber..
*/
if (last)
nr = last->number;
else
nr = 0;
for (i = preexisting; i < dive_table.nr; i++) {
struct dive *dive = get_dive(i);
dive->number = ++nr;
}
}
void process_loaded_dives()
{
int i;
@ -1477,46 +1417,53 @@ static void merge_imported_dives(struct dive_table *table)
}
}
static void insert_dive(struct dive_table *table, struct dive *d)
{
int idx = dive_table_get_insertion_index(table, d);
add_to_dive_table(table, idx, d);
}
/*
* Clear a dive_table and a trip_table. Think about generating these with macros.
*/
void clear_table(struct dive_table *table)
{
for (int i = 0; i < table->nr; i++)
free_dive(table->dives[i]);
table->nr = 0;
}
static void clear_trip_table(struct trip_table *table)
{
for (int i = 0; i < table->nr; i++)
free_trip(table->trips[i]);
table->nr = 0;
}
/*
* Try to merge a new dive into the dive at position idx. Return
* true on success. On success, the old dive will be deleted. On failure,
* it is unchanged.
* If replace_in is not NULL, the original dive will also be replaced
* by the merged dive in this dive table. If it is NULL it will be
* replaced in the dive table of its trip. This is used for merging dive
* in the trip table *and* the dive table.
* true on success. On success, the old dive will be added to the
* dives_to_remove table and the merged dive to the dives_to_add
* table. On failure everything stays unchanged.
* If "prefer_imported" is true, use data of the new dive.
*/
static bool try_to_merge_into(struct dive *dive_to_add, int idx, struct dive_table *table,
struct dive_table *replace_in, bool prefer_imported)
static bool try_to_merge_into(struct dive *dive_to_add, int idx, struct dive_table *table, bool prefer_imported,
/* output parameters: */
struct dive_table *dives_to_add, struct dive_table *dives_to_remove)
{
struct dive *old_dive = table->dives[idx];
struct dive *merged = try_to_merge(old_dive, dive_to_add, prefer_imported);
if (!merged)
return false;
/* Hack alert! If no replace_in table was passed, we are merging
* a non-trip dive into a potentially in-trip dive. In this case
* we also have to replace the merged dive for the old dive in the
* trip list. This will be removed in a subsequent commit, when
* the merging is done outside of processing */
if (!replace_in && old_dive->divetrip)
replace_in = &old_dive->divetrip->dives;
merged->selected = old_dive->selected;
merged->divetrip = old_dive->divetrip;
old_dive->divetrip = NULL;
table->dives[idx] = merged;
if (replace_in) {
int idx2 = get_idx_in_dive_table(replace_in, old_dive);
if (idx2 >= 0)
replace_in->dives[idx2] = merged;
}
free_dive(old_dive);
insert_dive(dives_to_remove, old_dive);
insert_dive(dives_to_add, merged);
return true;
}
/* Check if two trips overlap time-wise. */
static bool trips_overlap(const struct dive_trip *t1, const struct dive_trip *t2)
{
/* First, handle the empty-trip cases. */
@ -1529,22 +1476,33 @@ static bool trips_overlap(const struct dive_trip *t1, const struct dive_trip *t2
return trip_enddate(t2) >= trip_date(t1);
}
static bool insert_dive(struct dive_table *table, struct dive *d)
/* Check if a dive is ranked after the last dive of the global dive list */
static bool dive_is_after_last(struct dive *d)
{
int idx = dive_table_get_insertion_index(table, d);
add_to_dive_table(table, idx, d);
return idx == table->nr - 1;
if (dive_table.nr == 0)
return true;
return dive_less_than(dive_table.dives[dive_table.nr - 1], d);
}
/* Merge dives from dives_from into dives_to. Overlapping dives will be merged,
* non-overlapping dives will be moved. Optionally, if delete_from and add_to
* are non-null, dives will be removed / added to these tables. This supposes that
* all tables are sorted. */
/* Merge dives from "dives_from" into "dives_to". Overlapping dives will be merged,
* non-overlapping dives will be moved. The results will be added to the "dives_to_add"
* table. Dives that were merged are added to the "dives_to_remove" table.
* Any newly added (not merged) dive will be assigned to the trip from the "trip"
* paremeter. If "delete_from" is non-null dives will be removed from this table.
* This function supposes that all input tables are sorted.
* Returns true if any dive was added (not merged) that is not past the
* last dive of the global dive list (i.e. the sequence will change).
* The integer pointed to by "num_merged" will be increased for every
* merged dive that is added to "dives_to_add" */
static bool merge_dive_tables(struct dive_table *dives_from, struct dive_table *delete_from,
struct dive_table *dives_to, struct dive_table *add_to,
bool prefer_imported, struct dive_trip *trip)
struct dive_table *dives_to,
bool prefer_imported, struct dive_trip *trip,
/* output parameters: */
struct dive_table *dives_to_add, struct dive_table *dives_to_remove,
int *num_merged)
{
int i, j;
int last_merged_into = -1;
bool sequence_changed = false;
/* Merge newly imported dives into the dive table.
@ -1567,47 +1525,40 @@ static bool merge_dive_tables(struct dive_table *dives_from, struct dive_table *
while (j < dives_to->nr && dive_less_than(dives_to->dives[j], dive_to_add))
j++;
/* Try to merge into previous dive. */
if (j > 0 && dive_endtime(dives_to->dives[j - 1]) > dive_to_add->when) {
if (try_to_merge_into(dive_to_add, j - 1, dives_to, add_to, prefer_imported)) {
/* Try to merge into previous dive.
* We are extra-careful to not merge into the same dive twice, as that
* would put the merged-into dive twice onto the dives-to-delete list.
* In principle that shouldn't happen as all dives that compare equal
* by is_same_dive() were already merged, and is_same_dive() should be
* transitive. But let's just go *completely* sure for the odd corner-case. */
if (j > 0 && j - 1 > last_merged_into &&
dive_endtime(dives_to->dives[j - 1]) > dive_to_add->when) {
if (try_to_merge_into(dive_to_add, j - 1, dives_to, prefer_imported,
dives_to_add, dives_to_remove)) {
free_dive(dive_to_add);
last_merged_into = j - 1;
(*num_merged)++;
continue;
}
}
/* That didn't merge into the previous dive. If we're
* at the end of the dive table, quit the loop and add
* all new dives at the end. */
if (j >= dives_to->nr)
break;
/* Try to merge into next dive. */
if (dive_endtime(dive_to_add) > dives_to->dives[j]->when) {
if (try_to_merge_into(dive_to_add, j, dives_to, add_to, prefer_imported)) {
/* That didn't merge into the previous dive.
* Try to merge into next dive. */
if (j < dives_to->nr && j > last_merged_into &&
dive_endtime(dive_to_add) > dives_to->dives[j]->when) {
if (try_to_merge_into(dive_to_add, j, dives_to, prefer_imported,
dives_to_add, dives_to_remove)) {
free_dive(dive_to_add);
last_merged_into = j;
(*num_merged)++;
continue;
}
}
/* We couldnt merge dives, add at the given position. */
add_to_dive_table(dives_to, j, dive_to_add);
/* We couldnt merge dives, simply add to list of dives to-be-added. */
insert_dive(dives_to_add, dive_to_add);
sequence_changed |= !dive_is_after_last(dive_to_add);
dive_to_add->divetrip = trip;
if (add_to)
insert_dive(add_to, dive_to_add);
j++;
sequence_changed = true;
}
/* If there are still dives to add, add them at the end of the dive table. */
for ( ; i < dives_from->nr; i++) {
struct dive *dive_to_add = dives_from->dives[i];
if (delete_from)
remove_dive(delete_from, dive_to_add);
dive_to_add->divetrip = trip;
add_to_dive_table(dives_to, dives_to->nr, dive_to_add);
if (add_to)
sequence_changed |= !insert_dive(add_to, dive_to_add);
}
/* we took care of all dives, clean up the import table */
@ -1619,56 +1570,105 @@ static bool merge_dive_tables(struct dive_table *dives_from, struct dive_table *
/* Merge the dives of the trip "from" and the dive_table "dives_from" into the trip "to"
* and dive_table "dives_to". If "prefer_imported" is true, dive data of "from" takes
* precedence */
static bool merge_trips(struct dive_trip *from, struct dive_table *dives_from,
struct dive_trip *to, struct dive_table *dives_to, bool prefer_imported)
void add_imported_dives(struct dive_table *import_table, struct trip_table *import_trip_table,
bool prefer_imported, bool downloaded, bool merge_all_trips)
{
return merge_dive_tables(&from->dives, dives_from, &to->dives, dives_to, prefer_imported, to);
}
int i, idx;
struct dive_table dives_to_add = { 0 };
struct dive_table dives_to_remove = { 0 };
struct trip_table trips_to_add = { 0 };
static bool add_trip_to_table(struct dive_trip *trip, struct dive_table *dives_from,
struct trip_table *table, struct dive_table *dives_to)
{
int i;
struct dive *d;
bool sequence_changed = false;
for (i = 0; i < trip->dives.nr; i++) {
d = trip->dives.dives[i];
/* Process imported dives and generate lists of dives
* to-be-added and to-be-removed */
process_imported_dives(import_table, import_trip_table,
prefer_imported, downloaded, merge_all_trips,
&dives_to_add, &dives_to_remove, &trips_to_add);
/* Add dive to copy-to table */
sequence_changed |= !insert_dive(dives_to, d);
/* Remove dive from copy-from table */
remove_dive(dives_from, d);
/* Add new dives to trip, so that trips don't get deleted
* on deletion of old dives */
for (i = 0; i < dives_to_add.nr; i++) {
struct dive *d = dives_to_add.dives[i];
struct dive_trip *trip = d->divetrip;
if (!trip)
continue;
d->divetrip = NULL;
add_dive_to_trip(d, trip);
}
/* Add trip to list */
insert_trip(trip, table);
/* Remove old dives */
for (i = 0; i < dives_to_remove.nr; i++) {
idx = get_divenr(dives_to_remove.dives[i]);
delete_single_dive(idx);
}
dives_to_remove.nr = 0;
return sequence_changed;
/* Add new dives */
for (i = 0; i < dives_to_add.nr; i++) {
idx = dive_table_get_insertion_index(&dive_table, dives_to_add.dives[i]);
add_single_dive(idx, dives_to_add.dives[i]);
}
dives_to_add.nr = 0;
/* Add new trips */
for (i = 0; i < trips_to_add.nr; i++)
insert_trip(trips_to_add.trips[i], &trip_table);
trips_to_add.nr = 0;
/* We might have deleted the old selected dive.
* Choose the newest dive as selected (if any) */
current_dive = dive_table.nr > 0 ? dive_table.dives[dive_table.nr - 1] : NULL;
mark_divelist_changed(true);
}
/*
* Add imported dive to global dive table. Overlapping dives will
* be merged if possible. If prefer_imported is true, data of the
* new dives are prioritized in such a case.
* If downloaded is true, only the divecomputer of the first dive
/* Process imported dives: take a table of dives to be imported and
* generate three lists:
* 1) Dives to be added
* 2) Dives to be removed
* 3) Trips to be added
* The dives to be added are owning (i.e. the caller is responsible
* for freeing them).
* The dives and trips in import_table and import_trip table are
* consumed. On return, both tables have size 0.
* The output parameters should be empty - if not, their content
* will be cleared!
*
* Note: The new dives will have their divetrip-field set, but will
* *not* be part of the trip. The caller has to add them to the trip.
*
* The lists are generated by merging dives if possible. This is
* performed trip-wise. If prefer_imported is true, data of the
* new dives are prioritized in such a case. If merge_all_trips is
* true, all overlapping trips will be merged, not only non-autogenerated
* trips. If downloaded is true, only the divecomputer of the first dive
* will be considered, as it is assumed that all dives come from
* the same computer.
* If merge_all_trips is true, all trips are merged. This is used
* when merging log files. If it is false, only autogenerated trips
* are merged. This is used for download-from-dc. There, if the user
* explicitly asked for a new trip, we don't want to merge into old
* trips.
* Note: the dives in import_table and the trips in import_trip_table
* are consumed. On return both tables have size 0.
*/
void process_imported_dives(struct dive_table *import_table, struct trip_table *import_trip_table,
bool prefer_imported, bool downloaded, bool merge_all_trips)
bool prefer_imported, bool downloaded, bool merge_all_trips,
/* output parameters: */
struct dive_table *dives_to_add, struct dive_table *dives_to_remove,
struct trip_table *trips_to_add)
{
int i, j;
int i, j, nr, start_renumbering_at = 0;
struct dive_trip *trip_import, *trip_old;
int preexisting;
bool sequence_changed = false;
bool new_dive_has_number = false;
/* Make sure that output parameters don't contain garbage */
clear_table(dives_to_add);
clear_table(dives_to_remove);
clear_trip_table(trips_to_add);
/* Check if any of the new dives has a number. This will be
* important later to decide if we want to renumber the added
* dives */
for (int i = 0; i < import_table->nr; i++) {
if (import_table->dives[i]->number > 0) {
new_dive_has_number = true;
break;
}
}
/* If no dives were imported, don't bother doing anything */
if (!import_table->nr)
@ -1704,31 +1704,52 @@ void process_imported_dives(struct dive_table *import_table, struct trip_table *
for (j = 0; j < trip_table.nr; j++) {
trip_old = trip_table.trips[j];
if (trips_overlap(trip_import, trip_old)) {
sequence_changed |= merge_trips(trip_import, import_table, trip_old, &dive_table, prefer_imported);
sequence_changed |= merge_dive_tables(&trip_import->dives, import_table, &trip_old->dives,
prefer_imported, trip_old,
dives_to_add, dives_to_remove,
&start_renumbering_at);
free_trip(trip_import); /* All dives in trip have been consumed -> free */
break;
}
}
/* If no trip to merge-into was found, add trip as-is. */
if (j == trip_table.nr)
sequence_changed |= add_trip_to_table(trip_import, import_table, &trip_table, &dive_table);
if (j == trip_table.nr) {
/* Add dives to list of dives to add */
for (i = 0; i < trip_import->dives.nr; i++) {
struct dive *d = trip_import->dives.dives[i];
/* Add dive to list of dives to-be-added. */
insert_dive(dives_to_add, d);
sequence_changed |= !dive_is_after_last(d);
remove_dive(import_table, d);
}
/* Add trip to list of trips to add */
insert_trip(trip_import, trips_to_add);
trip_import->dives.nr = 0; /* Caller is responsible for adding dives to trip */
}
}
import_trip_table->nr = 0; /* All trips were consumed */
sequence_changed |= merge_dive_tables(import_table, NULL, &dive_table, NULL, prefer_imported, NULL);
/* The remaining dives in import_table are those that don't belong to
* a trip. Merge them into the global table. */
sequence_changed |= merge_dive_tables(import_table, NULL, &dive_table, prefer_imported, NULL,
dives_to_add, dives_to_remove, &start_renumbering_at);
/* If the sequence wasn't changed, renumber */
if (!sequence_changed)
try_to_renumber(preexisting);
/* Unlikely, but trip order may have changed owing to merging dives -
* make sure that they are still ordered */
sort_trip_table(&trip_table);
/* We might have deleted the old selected dive.
* Choose the newest dive as selected (if any) */
current_dive = dive_table.nr > 0 ? dive_table.dives[dive_table.nr - 1] : NULL;
mark_divelist_changed(true);
/* If new dives were only added at the end, renumber the added dives.
* But only if
* - The last dive in the old dive table had a number itself.
* - None of the new dives has a number.
*/
nr = dive_table.nr > 0 ? dive_table.dives[dive_table.nr - 1]->number : 0;
/* We counted the number of merged dives that were added to dives_to_add.
* Skip those. Since sequence_changed is false all added dives are *after*
* all merged dives. */
if (!sequence_changed && nr >= preexisting && !new_dive_has_number) {
for (i = start_renumbering_at; i < dives_to_add->nr; i++)
dives_to_add->dives[i]->number = ++nr;
}
}
/* return the number a dive gets when inserted at the given index.
@ -1819,16 +1840,6 @@ void clear_dive_file_data()
saved_git_id = "";
}
/*
* Clear a dive_table
*/
void clear_table(struct dive_table *table)
{
for (int i = 0; i < table->nr; i++)
free_dive(table->dives[i]);
table->nr = 0;
}
bool dive_less_than(const struct dive *a, const struct dive *b)
{
return comp_dives(a, b) < 0;

View file

@ -18,8 +18,12 @@ extern int init_decompression(struct deco_state *ds, struct dive *dive);
/* divelist core logic functions */
extern void process_loaded_dives();
extern void add_imported_dives(struct dive_table *import_table, struct trip_table *import_trip_table,
bool prefer_imported, bool downloaded, bool merge_all_trips);
extern void process_imported_dives(struct dive_table *import_table, struct trip_table *import_trip_table,
bool prefer_imported, bool downloaded, bool merge_all_trips);
bool prefer_imported, bool downloaded, bool merge_all_trips,
struct dive_table *dives_to_add, struct dive_table *dives_to_remove,
struct trip_table *trips_to_add);
extern char *get_dive_gas_string(const struct dive *dive);
extern struct dive **grow_dive_table(struct dive_table *table);

View file

@ -1011,7 +1011,7 @@ void DiveLogImportDialog::on_buttonBox_accepted()
}
}
process_imported_dives(&table, &trips, false, false, true);
add_imported_dives(&table, &trips, false, false, true);
Command::clear();
MainWindow::instance()->refreshDisplay();
}

View file

@ -525,9 +525,9 @@ void DownloadFromDCWidget::on_ok_clicked()
// remember the last downloaded dive (on most dive computers this will be the chronologically
// first new dive) and select it again after processing all the dives
int uniqId = table->dives[table->nr - 1]->id;
process_imported_dives(table, trips, preferDownloaded(), true, false);
add_imported_dives(table, trips, preferDownloaded(), true, false);
Command::clear();
// after process_imported_dives does any merging or resorting needed, we need
// after add_imported_dives does any merging or resorting needed, we need
// to recreate the model for the dive list so we can select the newest dive
MainWindow::instance()->recreateDiveList();
int idx = get_idx_by_uniq_id(uniqId);

View file

@ -1714,7 +1714,7 @@ void MainWindow::importFiles(const QStringList fileNames)
fileNamePtr = QFile::encodeName(fileNames.at(i));
parse_file(fileNamePtr.data(), &table, &trips);
}
process_imported_dives(&table, &trips, false, false, true);
add_imported_dives(&table, &trips, false, false, true);
Command::clear();
refreshDisplay();
}

View file

@ -771,7 +771,7 @@ void DivelogsDeWebServices::buttonClicked(QAbstractButton *button)
struct dive_table table = { 0 };
struct trip_table trips = { 0 };
parse_file(QFile::encodeName(zipFile.fileName()), &table, &trips);
process_imported_dives(&table, &trips, false, false, true);
add_imported_dives(&table, &trips, false, false, true);
MainWindow::instance()->refreshDisplay();
/* store last entered user/pass in config */

View file

@ -341,7 +341,7 @@ void QMLManager::mergeLocalRepo()
struct dive_table table = { 0 };
struct trip_table trips = { 0 };
parse_file(filename, &table, &trips);
process_imported_dives(&table, &trips, false, false, true);
add_imported_dives(&table, &trips, false, false, true);
}
void QMLManager::copyAppLogToClipboard()

View file

@ -157,7 +157,7 @@ void DiveImportedModel::recordDives()
delete_dive_from_table(diveTable, j);
}
process_imported_dives(diveTable, tripTable, true, true, false);
add_imported_dives(diveTable, tripTable, true, true, false);
}
QHash<int, QByteArray> DiveImportedModel::roleNames() const {

View file

@ -137,7 +137,7 @@ void TestGitStorage::testGitStorageCloudOfflineSync()
// read the local repo from the previous test and add dive 10
QCOMPARE(parse_file(qPrintable(localCacheRepo), &dive_table, &trip_table), 0);
QCOMPARE(parse_file(SUBSURFACE_TEST_DATA "/dives/test10.xml", &dive_table, &trip_table), 0);
// calling process_loaded_dives() sorts the table, but calling process_imported_dives()
// calling process_loaded_dives() sorts the table, but calling add_imported_dives()
// causes it to try to update the window title... let's not do that
process_loaded_dives();
// now save only to the local cache but not to the remote server

View file

@ -24,9 +24,9 @@ void TestMerge::testMergeEmpty()
struct dive_table table = { 0 };
struct trip_table trips = { 0 };
QCOMPARE(parse_file(SUBSURFACE_TEST_DATA "/dives/test47.xml", &table, &trips), 0);
process_imported_dives(&table, &trips, false, false, true);
add_imported_dives(&table, &trips, false, false, true);
QCOMPARE(parse_file(SUBSURFACE_TEST_DATA "/dives/test48.xml", &table, &trips), 0);
process_imported_dives(&table, &trips, false, false, true);
add_imported_dives(&table, &trips, false, false, true);
QCOMPARE(save_dives("./testmerge47+48.ssrf"), 0);
QFile org(SUBSURFACE_TEST_DATA "/dives/test47+48.xml");
org.open(QFile::ReadOnly);
@ -49,9 +49,9 @@ void TestMerge::testMergeBackwards()
struct dive_table table = { 0 };
struct trip_table trips = { 0 };
QCOMPARE(parse_file(SUBSURFACE_TEST_DATA "/dives/test48.xml", &table, &trips), 0);
process_imported_dives(&table, &trips, false, false, true);
add_imported_dives(&table, &trips, false, false, true);
QCOMPARE(parse_file(SUBSURFACE_TEST_DATA "/dives/test47.xml", &table, &trips), 0);
process_imported_dives(&table, &trips, false, false, true);
add_imported_dives(&table, &trips, false, false, true);
QCOMPARE(save_dives("./testmerge47+48.ssrf"), 0);
QFile org(SUBSURFACE_TEST_DATA "/dives/test47+48.xml");
org.open(QFile::ReadOnly);

View file

@ -16,7 +16,7 @@ void TestRenumber::testMerge()
struct dive_table table = { 0 };
struct trip_table trips = { 0 };
QCOMPARE(parse_file(SUBSURFACE_TEST_DATA "/dives/test47b.xml", &table, &trip_table), 0);
process_imported_dives(&table, &trips, false, false, true);
add_imported_dives(&table, &trips, false, false, true);
QCOMPARE(dive_table.nr, 1);
QCOMPARE(unsaved_changes(), 1);
mark_divelist_changed(false);
@ -27,7 +27,7 @@ void TestRenumber::testMergeAndAppend()
struct dive_table table = { 0 };
struct trip_table trips = { 0 };
QCOMPARE(parse_file(SUBSURFACE_TEST_DATA "/dives/test47c.xml", &table, &trip_table), 0);
process_imported_dives(&table, &trips, false, false, true);
add_imported_dives(&table, &trips, false, false, true);
QCOMPARE(dive_table.nr, 2);
QCOMPARE(unsaved_changes(), 1);
struct dive *d = get_dive(1);