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https://github.com/subsurface/subsurface.git
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28fe6a7b38
We want to prevent the user from accidentally deleting a cylinder with sensor readings. Therefore, we need such a function. Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
550 lines
14 KiB
C
550 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "divecomputer.h"
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#include "event.h"
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#include "extradata.h"
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#include "pref.h"
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#include "sample.h"
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#include "structured_list.h"
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#include "subsurface-string.h"
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#include <string.h>
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#include <stdlib.h>
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/*
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* Good fake dive profiles are hard.
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*
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* "depthtime" is the integral of the dive depth over
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* time ("area" of the dive profile). We want that
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* area to match the average depth (avg_d*max_t).
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*
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* To do that, we generate a 6-point profile:
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*
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* (0, 0)
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* (t1, max_d)
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* (t2, max_d)
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* (t3, d)
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* (t4, d)
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* (max_t, 0)
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*
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* with the same ascent/descent rates between the
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* different depths.
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*
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* NOTE: avg_d, max_d and max_t are given constants.
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* The rest we can/should play around with to get a
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* good-looking profile.
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*
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* That six-point profile gives a total area of:
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*
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* (max_d*max_t) - (max_d*t1) - (max_d-d)*(t4-t3)
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*
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* And the "same ascent/descent rates" requirement
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* gives us (time per depth must be same):
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*
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* t1 / max_d = (t3-t2) / (max_d-d)
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* t1 / max_d = (max_t-t4) / d
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*
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* We also obviously require:
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*
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* 0 <= t1 <= t2 <= t3 <= t4 <= max_t
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*
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* Let us call 'd_frac = d / max_d', and we get:
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*
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* Total area must match average depth-time:
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*
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* (max_d*max_t) - (max_d*t1) - (max_d-d)*(t4-t3) = avg_d*max_t
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* max_d*(max_t-t1-(1-d_frac)*(t4-t3)) = avg_d*max_t
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* max_t-t1-(1-d_frac)*(t4-t3) = avg_d*max_t/max_d
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* t1+(1-d_frac)*(t4-t3) = max_t*(1-avg_d/max_d)
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*
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* and descent slope must match ascent slopes:
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*
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* t1 / max_d = (t3-t2) / (max_d*(1-d_frac))
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* t1 = (t3-t2)/(1-d_frac)
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*
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* and
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*
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* t1 / max_d = (max_t-t4) / (max_d*d_frac)
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* t1 = (max_t-t4)/d_frac
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*
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* In general, we have more free variables than we have constraints,
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* but we can aim for certain basics, like a good ascent slope.
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*/
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static int fill_samples(struct sample *s, int max_d, int avg_d, int max_t, double slope, double d_frac)
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{
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double t_frac = max_t * (1 - avg_d / (double)max_d);
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int t1 = lrint(max_d / slope);
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int t4 = lrint(max_t - t1 * d_frac);
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int t3 = lrint(t4 - (t_frac - t1) / (1 - d_frac));
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int t2 = lrint(t3 - t1 * (1 - d_frac));
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if (t1 < 0 || t1 > t2 || t2 > t3 || t3 > t4 || t4 > max_t)
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return 0;
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s[1].time.seconds = t1;
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s[1].depth.mm = max_d;
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s[2].time.seconds = t2;
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s[2].depth.mm = max_d;
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s[3].time.seconds = t3;
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s[3].depth.mm = lrint(max_d * d_frac);
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s[4].time.seconds = t4;
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s[4].depth.mm = lrint(max_d * d_frac);
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return 1;
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}
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/* we have no average depth; instead of making up a random average depth
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* we should assume either a PADI rectangular profile (for short and/or
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* shallow dives) or more reasonably a six point profile with a 3 minute
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* safety stop at 5m */
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static void fill_samples_no_avg(struct sample *s, int max_d, int max_t, double slope)
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{
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// shallow or short dives are just trapecoids based on the given slope
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if (max_d < 10000 || max_t < 600) {
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s[1].time.seconds = lrint(max_d / slope);
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s[1].depth.mm = max_d;
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s[2].time.seconds = max_t - lrint(max_d / slope);
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s[2].depth.mm = max_d;
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} else {
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s[1].time.seconds = lrint(max_d / slope);
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s[1].depth.mm = max_d;
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s[2].time.seconds = max_t - lrint(max_d / slope) - 180;
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s[2].depth.mm = max_d;
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s[3].time.seconds = max_t - lrint(5000 / slope) - 180;
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s[3].depth.mm = 5000;
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s[4].time.seconds = max_t - lrint(5000 / slope);
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s[4].depth.mm = 5000;
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}
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}
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void fake_dc(struct divecomputer *dc)
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{
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alloc_samples(dc, 6);
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struct sample *fake = dc->sample;
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int i;
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dc->samples = 6;
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/* The dive has no samples, so create a few fake ones */
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int max_t = dc->duration.seconds;
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int max_d = dc->maxdepth.mm;
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int avg_d = dc->meandepth.mm;
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memset(fake, 0, 6 * sizeof(struct sample));
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fake[5].time.seconds = max_t;
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for (i = 0; i < 6; i++) {
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fake[i].bearing.degrees = -1;
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fake[i].ndl.seconds = -1;
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}
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if (!max_t || !max_d) {
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dc->samples = 0;
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return;
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}
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/* Set last manually entered time to the total dive length */
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dc->last_manual_time = dc->duration;
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/*
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* We want to fake the profile so that the average
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* depth ends up correct. However, in the absence of
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* a reasonable average, let's just make something
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* up. Note that 'avg_d == max_d' is _not_ a reasonable
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* average.
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* We explicitly treat avg_d == 0 differently */
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if (avg_d == 0) {
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/* we try for a sane slope, but bow to the insanity of
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* the user supplied data */
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fill_samples_no_avg(fake, max_d, max_t, MAX(2.0 * max_d / max_t, (double)prefs.ascratelast6m));
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if (fake[3].time.seconds == 0) { // just a 4 point profile
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dc->samples = 4;
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fake[3].time.seconds = max_t;
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}
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return;
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}
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if (avg_d < max_d / 10 || avg_d >= max_d) {
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avg_d = (max_d + 10000) / 3;
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if (avg_d > max_d)
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avg_d = max_d * 2 / 3;
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}
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if (!avg_d)
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avg_d = 1;
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/*
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* Ok, first we try a basic profile with a specific ascent
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* rate (5 meters per minute) and d_frac (1/3).
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*/
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if (fill_samples(fake, max_d, avg_d, max_t, (double)prefs.ascratelast6m, 0.33))
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return;
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/*
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* Ok, assume that didn't work because we cannot make the
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* average come out right because it was a quick deep dive
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* followed by a much shallower region
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*/
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if (fill_samples(fake, max_d, avg_d, max_t, 10000.0 / 60, 0.10))
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return;
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/*
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* Uhhuh. That didn't work. We'd need to find a good combination that
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* satisfies our constraints. Currently, we don't, we just give insane
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* slopes.
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*/
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if (fill_samples(fake, max_d, avg_d, max_t, 10000.0, 0.01))
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return;
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/* Even that didn't work? Give up, there's something wrong */
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}
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/* Find the divemode at time 'time' (in seconds) into the dive. Sequentially step through the divemode-change events,
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* saving the dive mode for each event. When the events occur AFTER 'time' seconds, the last stored divemode
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* is returned. This function is self-tracking, relying on setting the event pointer 'evp' so that, in each iteration
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* that calls this function, the search does not have to begin at the first event of the dive */
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enum divemode_t get_current_divemode(const struct divecomputer *dc, int time, const struct event **evp, enum divemode_t *divemode)
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{
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const struct event *ev = *evp;
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if (dc) {
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if (*divemode == UNDEF_COMP_TYPE) {
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*divemode = dc->divemode;
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ev = get_next_event(dc->events, "modechange");
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}
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} else {
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ev = NULL;
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}
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while (ev && ev->time.seconds < time) {
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*divemode = (enum divemode_t) ev->value;
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ev = get_next_event(ev->next, "modechange");
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}
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*evp = ev;
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return *divemode;
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}
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/* helper function to make it easier to work with our structures
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* we don't interpolate here, just use the value from the last sample up to that time */
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int get_depth_at_time(const struct divecomputer *dc, unsigned int time)
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{
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int depth = 0;
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if (dc && dc->sample)
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for (int i = 0; i < dc->samples; i++) {
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if (dc->sample[i].time.seconds > time)
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break;
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depth = dc->sample[i].depth.mm;
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}
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return depth;
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}
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/* The first divecomputer is embedded in the dive structure. Free its data but not
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* the structure itself. For all remainding dcs in the list, free data *and* structures. */
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void free_dive_dcs(struct divecomputer *dc)
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{
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free_dc_contents(dc);
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STRUCTURED_LIST_FREE(struct divecomputer, dc->next, free_dc);
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}
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/* make room for num samples; if not enough space is available, the sample
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* array is reallocated and the existing samples are copied. */
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void alloc_samples(struct divecomputer *dc, int num)
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{
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if (num > dc->alloc_samples) {
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dc->alloc_samples = (num * 3) / 2 + 10;
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dc->sample = realloc(dc->sample, dc->alloc_samples * sizeof(struct sample));
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if (!dc->sample)
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dc->samples = dc->alloc_samples = 0;
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}
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}
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void free_samples(struct divecomputer *dc)
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{
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if (dc) {
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free(dc->sample);
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dc->sample = 0;
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dc->samples = 0;
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dc->alloc_samples = 0;
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}
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}
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struct sample *prepare_sample(struct divecomputer *dc)
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{
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if (dc) {
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int nr = dc->samples;
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struct sample *sample;
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alloc_samples(dc, nr + 1);
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if (!dc->sample)
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return NULL;
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sample = dc->sample + nr;
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memset(sample, 0, sizeof(*sample));
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// Copy the sensor numbers - but not the pressure values
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// from the previous sample if any.
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if (nr) {
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for (int idx = 0; idx < MAX_SENSORS; idx++)
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sample->sensor[idx] = sample[-1].sensor[idx];
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}
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// Init some values with -1
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sample->bearing.degrees = -1;
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sample->ndl.seconds = -1;
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return sample;
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}
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return NULL;
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}
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void finish_sample(struct divecomputer *dc)
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{
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dc->samples++;
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}
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struct sample *add_sample(const struct sample *sample, int time, struct divecomputer *dc)
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{
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struct sample *p = prepare_sample(dc);
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if (p) {
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*p = *sample;
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p->time.seconds = time;
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finish_sample(dc);
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}
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return p;
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}
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/*
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* Calculate how long we were actually under water, and the average
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* depth while under water.
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*
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* This ignores any surface time in the middle of the dive.
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*/
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void fixup_dc_duration(struct divecomputer *dc)
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{
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int duration, i;
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int lasttime, lastdepth, depthtime;
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duration = 0;
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lasttime = 0;
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lastdepth = 0;
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depthtime = 0;
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for (i = 0; i < dc->samples; i++) {
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struct sample *sample = dc->sample + i;
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int time = sample->time.seconds;
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int depth = sample->depth.mm;
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/* We ignore segments at the surface */
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if (depth > SURFACE_THRESHOLD || lastdepth > SURFACE_THRESHOLD) {
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duration += time - lasttime;
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depthtime += (time - lasttime) * (depth + lastdepth) / 2;
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}
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lastdepth = depth;
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lasttime = time;
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}
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if (duration) {
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dc->duration.seconds = duration;
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dc->meandepth.mm = (depthtime + duration / 2) / duration;
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}
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}
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/*
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* What do the dive computers say the water temperature is?
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* (not in the samples, but as dc property for dcs that support that)
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*/
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unsigned int dc_watertemp(const struct divecomputer *dc)
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{
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int sum = 0, nr = 0;
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do {
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if (dc->watertemp.mkelvin) {
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sum += dc->watertemp.mkelvin;
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nr++;
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}
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} while ((dc = dc->next) != NULL);
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if (!nr)
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return 0;
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return (sum + nr / 2) / nr;
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}
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/*
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* What do the dive computers say the air temperature is?
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*/
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unsigned int dc_airtemp(const struct divecomputer *dc)
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{
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int sum = 0, nr = 0;
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do {
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if (dc->airtemp.mkelvin) {
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sum += dc->airtemp.mkelvin;
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nr++;
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}
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} while ((dc = dc->next) != NULL);
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if (!nr)
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return 0;
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return (sum + nr / 2) / nr;
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}
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/* copies all events in this dive computer */
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void copy_events(const struct divecomputer *s, struct divecomputer *d)
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{
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const struct event *ev;
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struct event **pev;
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if (!s || !d)
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return;
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ev = s->events;
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pev = &d->events;
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while (ev != NULL) {
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struct event *new_ev = clone_event(ev);
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*pev = new_ev;
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pev = &new_ev->next;
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ev = ev->next;
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}
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*pev = NULL;
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}
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void copy_samples(const struct divecomputer *s, struct divecomputer *d)
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{
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/* instead of carefully copying them one by one and calling add_sample
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* over and over again, let's just copy the whole blob */
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if (!s || !d)
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return;
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int nr = s->samples;
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d->samples = nr;
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d->alloc_samples = nr;
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// We expect to be able to read the memory in the other end of the pointer
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// if its a valid pointer, so don't expect malloc() to return NULL for
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// zero-sized malloc, do it ourselves.
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d->sample = NULL;
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if(!nr)
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return;
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d->sample = malloc(nr * sizeof(struct sample));
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if (d->sample)
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memcpy(d->sample, s->sample, nr * sizeof(struct sample));
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}
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void add_event_to_dc(struct divecomputer *dc, struct event *ev)
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{
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struct event **p;
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p = &dc->events;
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/* insert in the sorted list of events */
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while (*p && (*p)->time.seconds <= ev->time.seconds)
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p = &(*p)->next;
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ev->next = *p;
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*p = ev;
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}
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struct event *add_event(struct divecomputer *dc, unsigned int time, int type, int flags, int value, const char *name)
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{
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struct event *ev = create_event(time, type, flags, value, name);
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if (!ev)
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return NULL;
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add_event_to_dc(dc, ev);
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remember_event(name);
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return ev;
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}
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/* Substitutes an event in a divecomputer for another. No reordering is performed! */
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void swap_event(struct divecomputer *dc, struct event *from, struct event *to)
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{
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for (struct event **ep = &dc->events; *ep; ep = &(*ep)->next) {
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if (*ep == from) {
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to->next = from->next;
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*ep = to;
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from->next = NULL; // For good measure.
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break;
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}
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}
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}
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/* Remove given event from dive computer. Does *not* free the event. */
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void remove_event_from_dc(struct divecomputer *dc, struct event *event)
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{
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for (struct event **ep = &dc->events; *ep; ep = &(*ep)->next) {
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if (*ep == event) {
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*ep = event->next;
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event->next = NULL; // For good measure.
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break;
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}
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}
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}
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void add_extra_data(struct divecomputer *dc, const char *key, const char *value)
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{
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struct extra_data **ed = &dc->extra_data;
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if (!strcasecmp(key, "Serial")) {
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dc->deviceid = calculate_string_hash(value);
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dc->serial = strdup(value);
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}
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if (!strcmp(key, "FW Version")) {
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dc->fw_version = strdup(value);
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}
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while (*ed)
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ed = &(*ed)->next;
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*ed = malloc(sizeof(struct extra_data));
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if (*ed) {
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(*ed)->key = strdup(key);
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(*ed)->value = strdup(value);
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(*ed)->next = NULL;
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}
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}
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bool is_dc_planner(const struct divecomputer *dc)
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{
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return same_string(dc->model, "planned dive");
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}
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/*
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* Match two dive computer entries against each other, and
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* tell if it's the same dive. Return 0 if "don't know",
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* positive for "same dive" and negative for "definitely
|
|
* not the same dive"
|
|
*/
|
|
int match_one_dc(const struct divecomputer *a, const struct divecomputer *b)
|
|
{
|
|
/* Not same model? Don't know if matching.. */
|
|
if (!a->model || !b->model)
|
|
return 0;
|
|
if (strcasecmp(a->model, b->model))
|
|
return 0;
|
|
|
|
/* Different device ID's? Don't know */
|
|
if (a->deviceid != b->deviceid)
|
|
return 0;
|
|
|
|
/* Do we have dive IDs? */
|
|
if (!a->diveid || !b->diveid)
|
|
return 0;
|
|
|
|
/*
|
|
* If they have different dive ID's on the same
|
|
* dive computer, that's a definite "same or not"
|
|
*/
|
|
return a->diveid == b->diveid && a->when == b->when ? 1 : -1;
|
|
}
|
|
|
|
static void free_extra_data(struct extra_data *ed)
|
|
{
|
|
free((void *)ed->key);
|
|
free((void *)ed->value);
|
|
}
|
|
|
|
void free_dc_contents(struct divecomputer *dc)
|
|
{
|
|
free(dc->sample);
|
|
free((void *)dc->model);
|
|
free((void *)dc->serial);
|
|
free((void *)dc->fw_version);
|
|
free_events(dc->events);
|
|
STRUCTURED_LIST_FREE(struct extra_data, dc->extra_data, free_extra_data);
|
|
}
|
|
|
|
void free_dc(struct divecomputer *dc)
|
|
{
|
|
free_dc_contents(dc);
|
|
free(dc);
|
|
}
|