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Cylinders: access cylinders with get_cylinder()

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Instead of accessing the cylinder table directly, use the get_cylinder()
function. This gives less unwieldy expressions. But more importantly,
the function does bound checking. This is crucial for now as the code
hasn't be properly audited since the change to arbitrarily sized
cylinder tables. Accesses of invalid cylinder indexes may lead to
silent data-corruption that is sometimes not even noticed by
valgrind. Returning NULL instead of an invalid pointer will make
debugging much easier.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2019-08-04 22:13:49 +02:00 • committed by Dirk Hohndel
parent 52d8d89f73
commit 794066b236
30 changed files with 149 additions and 148 deletions
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6
profile-widget/profilewidget2.cpp
View file

@ -1536,7 +1536,7 @@ void ProfileWidget2::contextMenuEvent(QContextMenuEvent *event)
int newGasIdx = gasChangeIdx + 1;
const struct plot_data &newGasEntry = plotInfo.entry[newGasIdx];
qDebug() << "after gas change at " << newGasEntry->sec << ": sensor pressure" << newGasEntry->pressure[0] << "interpolated" << newGasEntry->pressure[1];
if (get_plot_sensor_pressure(&plotInfo, gasChangeIdx) == 0 || displayed_dive.cylinders.cylinders[gasChangeEntry->sensor[0]].sample_start.mbar == 0) {
if (get_plot_sensor_pressure(&plotInfo, gasChangeIdx) == 0 || get_cylinder(&displayed_dive, gasChangeEntry->sensor[0])->sample_start.mbar == 0) {
// if we have no sensorpressure or if we have no pressure from samples we can assume that
// we only have interpolated pressure (the pressure in the entry may be stored in the sensor
// pressure field if this is the first or last entry for this tank... see details in gaspressures.c
@ -1545,7 +1545,7 @@ void ProfileWidget2::contextMenuEvent(QContextMenuEvent *event)
QAction *adjustOldPressure = m.addAction(tr("Adjust pressure of cyl. %1 (currently interpolated as %2)")
.arg(gasChangeEntry->sensor[0] + 1).arg(get_pressure_string(pressure)));
}
if (get_plot_sensor_pressure(&plotInfo, newGasIdx) == 0 || displayed_dive.cylinders.cylinders[newGasEntry->sensor[0]].sample_start.mbar == 0) {
if (get_plot_sensor_pressure(&plotInfo, newGasIdx) == 0 || get_cylinder(&displayed_dive, newGasEntry->sensor[0])->sample_start.mbar == 0) {
// we only have interpolated press -- see commend above
pressure_t pressure;
pressure.mbar = get_plot_interpolated_pressure(&plotInfo, newGasIdx) ? : get_plot_sensor_pressure(&plotInfo, newGasIdx);
@ -1882,7 +1882,7 @@ void ProfileWidget2::repositionDiveHandlers()
QLineF line(p1, p2);
QPointF pos = line.pointAt(0.5);
gases[i]->setPos(pos);
gases[i]->setText(get_gas_string(displayed_dive.cylinders.cylinders[datapoint.cylinderid].gasmix));
gases[i]->setText(get_gas_string(get_cylinder(&displayed_dive, datapoint.cylinderid)->gasmix));
gases[i]->setVisible(datapoint.entered &&
(i == 0 || gases[i]->text() != gases[i-1]->text()));
}