Bail out of deco calculation after 48h or dive time

With very low values of GFhigh and setting the last stop depth to 6m it
is possible to create dives that need infintie decompression time.

This ends deco after 48h and replaces the dive plan with an error message.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

3 files changed, 21 insertions, 6 deletions

diff --git a/dive.h b/dive.h
index a1abab657..3ca305ff0 100644
--- a/dive.h
+++ b/dive.h
@@ -711,7 +711,7 @@ struct divedatapoint *create_dp(int time_incr, int depth, struct gasmix gasmix,
 #if DEBUG_PLAN
 void dump_plan(struct diveplan *diveplan);
 #endif
-void plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool show_disclaimer);
+int plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool show_disclaimer);
 void delete_single_dive(int idx);
 
 struct event *get_next_event(struct event *event, char *name);
diff --git a/planner.c b/planner.c
index 5d4570b28..c8f9fe462 100644
--- a/planner.c
+++ b/planner.c
@@ -517,7 +517,7 @@ static unsigned int *sort_stops(int *dstops, int dnr, struct gaschanges *gstops,
 	return stoplevels;
 }
 
-static void add_plan_to_notes(struct diveplan *diveplan, struct dive *dive, bool show_disclaimer)
+static void add_plan_to_notes(struct diveplan *diveplan, struct dive *dive, bool show_disclaimer, int error)
 {
 	char buffer[20000], temp[1000];
 	int len, lastdepth = 0, lasttime = 0;
@@ -533,6 +533,15 @@ static void add_plan_to_notes(struct diveplan *diveplan, struct dive *dive, bool
 	if (!dp)
 		return;
 
+	if (error) {
+		snprintf(temp, sizeof(temp),
+			 translate("gettextFromC", "Decompression calculation aborted due to excessive time"));
+		snprintf(buffer, sizeof(buffer), "<span style='color: red;'>%s </span> %s<br>",
+				translate("gettextFromC", "Warning:"), temp);
+		dive->notes = strdup(buffer);
+		return;
+	}
+
 	len = show_disclaimer ? snprintf(buffer, sizeof(buffer), "<div><b>%s<b></div><br>", disclaimer) : 0;
 	snprintf(temp, sizeof(temp), translate("gettextFromC", "based on GFlow = %d and GFhigh = %d"),
 		 diveplan->gflow, diveplan->gfhigh);
@@ -724,7 +733,7 @@ int ascend_velocity(int depth, int avg_depth, int bottom_time)
 	}
 }
 
-void plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool show_disclaimer)
+int plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool show_disclaimer)
 {
 	struct sample *sample;
 	int po2;
@@ -747,6 +756,7 @@ void plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool
 	int o2time = 0;
 	int breaktime = -1;
 	int breakcylinder;
+	int error = 0;
 
 	set_gf(diveplan->gflow, diveplan->gfhigh, prefs.gf_low_at_maxdepth);
 	if (!diveplan->surface_pressure)
@@ -772,9 +782,8 @@ void plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool
 		transitiontime = depth / 75; /* this still needs to be made configurable */
 		plan_add_segment(diveplan, transitiontime, 0, gas, po2, false);
 		create_dive_from_plan(diveplan, is_planner);
-		return;
+		return(error);
 	}
-
 	tissue_tolerance = tissue_at_end(&displayed_dive, cached_datap);
 
 #if DEBUG_PLAN & 4
@@ -889,6 +898,11 @@ void plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool
 						       DECOTIMESTEP, po2, &displayed_dive);
 			cache_deco_state(tissue_tolerance, &trial_cache);
 			clock += DECOTIMESTEP;
+			/* Finish infinite deco */
+			if(clock >= 48 * 3600 && depth >= 6000) {
+				error = LONGDECO;
+				break;
+			}
 			if (prefs.doo2breaks) {
 				if (get_o2(&displayed_dive.cylinder[current_cylinder].gasmix) == 1000) {
 					o2time += DECOTIMESTEP;
@@ -929,7 +943,7 @@ void plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool
 	 * data that we need to be there when plotting the dive */
 	plan_add_segment(diveplan, clock - previous_point_time, 0, gas, po2, false);
 	create_dive_from_plan(diveplan, is_planner);
-	add_plan_to_notes(diveplan, &displayed_dive, show_disclaimer);
+	add_plan_to_notes(diveplan, &displayed_dive, show_disclaimer, error);
 	fixup_dc_duration(&displayed_dive.dc);
 
 	free(stoplevels);
diff --git a/planner.h b/planner.h
index 0d3c0ec27..a737f26c6 100644
--- a/planner.h
+++ b/planner.h
@@ -1,6 +1,7 @@
 #ifndef PLANNER_H
 #define PLANNER_H
 
+#define LONGDECO 1
 
 #ifdef __cplusplus
 extern "C" {