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-rw-r--r--divelist.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/divelist.c b/divelist.c
index aa29c72ed..feec27b19 100644
--- a/divelist.c
+++ b/divelist.c
@@ -466,7 +466,8 @@ static void get_dive_gas(struct dive *dive, int *o2_p, int *he_p, int *o2low_p)
int o2 = mix->o2.permille;
int he = mix->he.permille;
struct divecomputer *dc = &dive->dc;
- int used = !i; /* The first gas is always used */
+ int used = 0;
+ int first_gas_explicit = 0;
while (dc){
struct event *event = dc->events;
@@ -476,6 +477,8 @@ static void get_dive_gas(struct dive *dive, int *o2_p, int *he_p, int *o2low_p)
unsigned int event_he = event->value >> 16;
unsigned int event_o2 = event->value & 0xffff;
+ if (event->time.seconds < 30)
+ first_gas_explicit = 1;
if (is_air(o2, he)){
if (is_air(event_o2 * 10, event_he * 10))
used = 1;
@@ -490,6 +493,11 @@ static void get_dive_gas(struct dive *dive, int *o2_p, int *he_p, int *o2low_p)
}
dc = dc->next;
}
+
+ /* Unless explicity set, the first gas to use has index 0 */
+ if (i == 0 && !first_gas_explicit)
+ used = 1;
+
if (!used)
continue;