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core: replace dynamic arrays in dive.cpp by C++ constructs

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Avoid error-prone malloc/free pairs. This uses somewhat
obscure constructs to stay as close as possible to the
original C code. Notably, it uses mostly unique_ptr<T[]>
which doesn't store the length of the array, because the
length is supposed to be known.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2024-02-27 13:24:36 +01:00
parent 317a1c91d4
commit f47196087e
1 changed files with 23 additions and 41 deletions
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64
core/dive.cpp
View file

@ -5,6 +5,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <memory>
#include "dive.h"
#include "gettext.h"
#include "subsurface-string.h"
@ -455,8 +456,8 @@ static bool has_unknown_used_cylinders(const struct dive *dive, const struct div
{
int idx;
const struct event *ev;
bool *used_and_unknown = (bool *)malloc(dive->cylinders.nr * sizeof(bool));
memcpy(used_and_unknown, used_cylinders, dive->cylinders.nr * sizeof(bool));
auto used_and_unknown = std::make_unique<bool[]>(dive->cylinders.nr);
std::copy(used_cylinders, used_cylinders + dive->cylinders.nr, used_and_unknown.get());
/* We know about using the O2 cylinder in a CCR dive */
if (dc->divemode == CCR) {
@ -485,18 +486,15 @@ static bool has_unknown_used_cylinders(const struct dive *dive, const struct div
ev = get_next_event(ev->next, "gaschange");
}
free(used_and_unknown);
return num > 0;
}
extern "C" void per_cylinder_mean_depth(const struct dive *dive, struct divecomputer *dc, int *mean, int *duration)
{
int i;
int *depthtime;
int32_t lasttime = 0;
int lastdepth = 0;
int idx = 0;
bool *used_cylinders;
int num_used_cylinders;
if (dive->cylinders.nr <= 0)
@ -512,18 +510,16 @@ extern "C" void per_cylinder_mean_depth(const struct dive *dive, struct divecomp
* if we don't actually know about the usage of all the
* used cylinders.
*/
used_cylinders = (bool *)malloc(dive->cylinders.nr * sizeof(bool));
num_used_cylinders = get_cylinder_used(dive, used_cylinders);
if (has_unknown_used_cylinders(dive, dc, used_cylinders, num_used_cylinders)) {
auto used_cylinders = std::make_unique<bool[]>(dive->cylinders.nr);
num_used_cylinders = get_cylinder_used(dive, used_cylinders.get());
if (has_unknown_used_cylinders(dive, dc, used_cylinders.get(), num_used_cylinders)) {
/*
* If we had more than one used cylinder, but
* do not know usage of them, we simply cannot
* account mean depth to them.
*/
if (num_used_cylinders > 1) {
free(used_cylinders);
if (num_used_cylinders > 1)
return;
}
/*
* For a single cylinder, use the overall mean
@ -536,15 +532,12 @@ extern "C" void per_cylinder_mean_depth(const struct dive *dive, struct divecomp
}
}
free(used_cylinders);
return;
}
free(used_cylinders);
if (!dc->samples)
fake_dc(dc);
const struct event *ev = get_next_event(dc->events, "gaschange");
depthtime = (int*)malloc(dive->cylinders.nr * sizeof(*depthtime));
memset(depthtime, 0, dive->cylinders.nr * sizeof(*depthtime));
std::vector<int> depthtime(dive->cylinders.nr, 0);
for (i = 0; i < dc->samples; i++) {
struct sample *sample = dc->sample + i;
int32_t time = sample->time.seconds;
@ -577,7 +570,6 @@ extern "C" void per_cylinder_mean_depth(const struct dive *dive, struct divecomp
if (duration[i])
mean[i] = (depthtime[i] + duration[i] / 2) / duration[i];
}
free(depthtime);
}
static void update_min_max_temperatures(struct dive *dive, temperature_t temperature)
@ -1798,7 +1790,7 @@ static int different_manual_pressures(const cylinder_t *a, const cylinder_t *b)
* same cylinder use (ie OC/Diluent/Oxygen), and if pressures
* have been added manually they need to match.
*/
static int match_cylinder(const cylinder_t *cyl, const struct dive *dive, const bool *try_match)
static int match_cylinder(const cylinder_t *cyl, const struct dive *dive, const bool try_match[])
{
int i;
@ -1926,24 +1918,22 @@ static void merge_cylinders(struct dive *res, const struct dive *a, const struct
{
int i;
int max_cylinders = a->cylinders.nr + b->cylinders.nr;
bool *used_in_a = (bool *)malloc(max_cylinders * sizeof(bool));
bool *used_in_b = (bool *)malloc(max_cylinders * sizeof(bool));
bool *try_to_match = (bool *)malloc(max_cylinders * sizeof(bool));
auto used_in_a = std::make_unique<bool[]>(max_cylinders);
auto used_in_b = std::make_unique<bool[]>(max_cylinders);
auto try_to_match = std::make_unique<bool[]>(max_cylinders);
std::fill(try_to_match.get(), try_to_match.get() + max_cylinders, false);
/* First, clear all cylinders in destination */
clear_cylinder_table(&res->cylinders);
/* Clear all cylinder mappings */
for (i = 0; i < a->cylinders.nr; i++)
mapping_a[i] = -1;
for (i = 0; i < b->cylinders.nr; i++)
mapping_b[i] = -1;
std::fill(mapping_a, mapping_a + a->cylinders.nr, -1);
std::fill(mapping_b, mapping_b + b->cylinders.nr, -1);
/* Calculate usage map of cylinders, clear matching map */
for (i = 0; i < max_cylinders; i++) {
used_in_a[i] = cylinder_in_use(a, i);
used_in_b[i] = cylinder_in_use(b, i);
try_to_match[i] = false;
}
/*
@ -1969,7 +1959,7 @@ static void merge_cylinders(struct dive *res, const struct dive *a, const struct
if (!used_in_b[i])
continue;
j = match_cylinder(get_cylinder(b, i), res, try_to_match);
j = match_cylinder(get_cylinder(b, i), res, try_to_match.get());
/* No match? Add it to the result */
if (j < 0) {
@ -1986,10 +1976,6 @@ static void merge_cylinders(struct dive *res, const struct dive *a, const struct
/* Don't match the same target more than once */
try_to_match[j] = false;
}
free(used_in_a);
free(used_in_b);
free(try_to_match);
}
/* Check whether a weightsystem table contains a given weightsystem */
@ -2609,7 +2595,6 @@ extern "C" bool has_planned(const struct dive *dive, bool planned)
extern "C" struct dive *merge_dives(const struct dive *a, const struct dive *b, int offset, bool prefer_downloaded, struct dive_trip **trip, struct dive_site **site)
{
struct dive *res = alloc_dive();
int *cylinders_map_a, *cylinders_map_b;
if (offset) {
/*
@ -2646,18 +2631,18 @@ extern "C" struct dive *merge_dives(const struct dive *a, const struct dive *b,
taglist_merge(&res->tag_list, a->tag_list, b->tag_list);
/* if we get dives without any gas / cylinder information in an import, make sure
* that there is at leatst one entry in the cylinder map for that dive */
cylinders_map_a = (int *)malloc(MAX(1, a->cylinders.nr) * sizeof(*cylinders_map_a));
cylinders_map_b = (int *)malloc(MAX(1, b->cylinders.nr) * sizeof(*cylinders_map_b));
merge_cylinders(res, a, b, cylinders_map_a, cylinders_map_b);
auto cylinders_map_a = std::make_unique<int[]>(std::max(1, a->cylinders.nr));
auto cylinders_map_b = std::make_unique<int[]>(std::max(1, b->cylinders.nr));
merge_cylinders(res, a, b, cylinders_map_a.get(), cylinders_map_b.get());
merge_equipment(res, a, b);
merge_temperatures(res, a, b);
if (prefer_downloaded) {
/* If we prefer downloaded, do those first, and get rid of "might be same" computers */
join_dive_computers(res, &res->dc, &b->dc, &a->dc, cylinders_map_b, cylinders_map_a, 1);
join_dive_computers(res, &res->dc, &b->dc, &a->dc, cylinders_map_b.get(), cylinders_map_a.get(), 1);
} else if (offset && might_be_same_device(&a->dc, &b->dc))
interleave_dive_computers(res, &res->dc, &a->dc, &b->dc, cylinders_map_a, cylinders_map_b, offset);
interleave_dive_computers(res, &res->dc, &a->dc, &b->dc, cylinders_map_a.get(), cylinders_map_b.get(), offset);
else
join_dive_computers(res, &res->dc, &a->dc, &b->dc, cylinders_map_a, cylinders_map_b, 0);
join_dive_computers(res, &res->dc, &a->dc, &b->dc, cylinders_map_a.get(), cylinders_map_b.get(), 0);
/* The CNS values will be recalculated from the sample in fixup_dive() */
res->cns = res->maxcns = 0;
@ -2671,8 +2656,6 @@ extern "C" struct dive *merge_dives(const struct dive *a, const struct dive *b,
(*site)->location = b->dive_site->location;
}
fixup_dive(res);
free(cylinders_map_a);
free(cylinders_map_b);
return res;
}
@ -2702,7 +2685,7 @@ static void force_fixup_dive(struct dive *d)
int old_mintemp = d->mintemp.mkelvin;
int old_maxtemp = d->maxtemp.mkelvin;
duration_t old_duration = d->duration;
struct start_end_pressure *old_pressures = (start_end_pressure *)malloc(d->cylinders.nr * sizeof(*old_pressures));
std::vector<start_end_pressure> old_pressures(d->cylinders.nr);
d->maxdepth.mm = 0;
dc->maxdepth.mm = 0;
@ -2741,7 +2724,6 @@ static void force_fixup_dive(struct dive *d)
if (!get_cylinder(d, i)->end.mbar)
get_cylinder(d, i)->end = old_pressures[i].end;
}
free(old_pressures);
}
/*