Add a usage field to the tank and gas mix

For gas consumption calculations it's very convenient to know whether a
tank is used for example in a sidemount configuration, or as
oxygen/diluent tank on a rebreather.

For rebreather dives, it's convenient to know whether a gas mix is used
as a closed-circuit mix (oxygen/diluent) or as an open circuit mix
(bailout).

examples/output_xml.c

@@ -338,11 +338,19 @@ dctool_xml_output_write (dctool_output_t *abstract, dc_parser_t *parser, const u
 			"<gasmix>\n"
 			"   <he>%.1f</he>\n"
 			"   <o2>%.1f</o2>\n"
-			"   <n2>%.1f</n2>\n"
+			"   <n2>%.1f</n2>\n",
-			"</gasmix>\n",
 			gasmix.helium * 100.0,
 			gasmix.oxygen * 100.0,
 			gasmix.nitrogen * 100.0);
+		if (gasmix.usage) {
+			const char *usage[] = {"none", "oxygen", "diluent", "sidemount"};
+			fprintf (output->ostream,
+				"   <usage>%s</usage>\n",
+				usage[gasmix.usage]);
+		}
+		fprintf (output->ostream,
+			"</gasmix>\n");
+
 	}
 
 	// Parse the tanks.
@@ -370,6 +378,12 @@ dctool_xml_output_write (dctool_output_t *abstract, dc_parser_t *parser, const u
 				"   <gasmix>%u</gasmix>\n",
 				tank.gasmix);
 		}
+		if (tank.usage) {
+			const char *usage[] = {"none", "oxygen", "diluent", "sidemount"};
+			fprintf (output->ostream,
+				"   <usage>%s</usage>\n",
+				usage[tank.usage]);
+		}
 		if (tank.type != DC_TANKVOLUME_NONE) {
 			fprintf (output->ostream,
 				"   <type>%s</type>\n"

include/libdivecomputer/parser.h

@@ -141,10 +141,18 @@ typedef struct dc_salinity_t {
 	double density;
 } dc_salinity_t;
 
+typedef enum dc_usage_t {
+	DC_USAGE_NONE,
+	DC_USAGE_OXYGEN,
+	DC_USAGE_DILUENT,
+	DC_USAGE_SIDEMOUNT,
+} dc_usage_t;
+
 typedef struct dc_gasmix_t {
 	double helium;
 	double oxygen;
 	double nitrogen;
+	dc_usage_t usage;
 } dc_gasmix_t;
 
 #define DC_SENSOR_NONE    0xFFFFFFFF
@@ -186,6 +194,7 @@ typedef struct dc_tank_t {
     double workpressure;  /* Work pressure (bar) */
     double beginpressure; /* Begin pressure (bar) */
     double endpressure;   /* End pressure (bar) */
+    dc_usage_t usage;
 } dc_tank_t;
 
 typedef enum dc_decomodel_type_t {

src/atomics_cobalt_parser.c

@@ -171,6 +171,7 @@ atomics_cobalt_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, un
 			*((unsigned int *) value) = p[0x2a];
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = p[SZ_HEADER + SZ_GASMIX * flags + 5] / 100.0;
 			gasmix->oxygen = p[SZ_HEADER + SZ_GASMIX * flags + 4] / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;
@@ -202,6 +203,7 @@ atomics_cobalt_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, un
 			tank->gasmix = flags;
 			tank->beginpressure = array_uint16_le(p + 6) * PSI / BAR;
 			tank->endpressure = array_uint16_le(p + 14) * PSI / BAR;
+			tank->usage = DC_USAGE_NONE;
 			break;
 		case DC_FIELD_DIVEMODE:
 			switch(p[0x24]) {

src/cochran_commander_parser.c

@@ -514,6 +514,7 @@ cochran_commander_parser_get_field (dc_parser_t *abstract, dc_field_type_t type,
 			// Gas percentages are decimal and encoded as
 			// highbyte = integer portion
 			// lowbyte = decimal portion, divide by 256 to get decimal value
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->oxygen = array_uint16_le (data + layout->oxygen + 2 * flags) / 256.0 / 100;
 			if (layout->helium == UNSUPPORTED) {
 				gasmix->helium = 0;

src/cressi_edy_parser.c

@@ -152,6 +152,7 @@ cressi_edy_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsign
 			*((unsigned int *) value) = cressi_edy_parser_count_gasmixes(p);
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = 0.0;
 			gasmix->oxygen = bcd2dec (p[0x17 - flags]) / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/cressi_goa_parser.c

@@ -250,6 +250,7 @@ cressi_goa_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsign
 			*((unsigned int *) value) = ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = 0.0;
 			gasmix->oxygen = data[layout->gasmix + 2 * flags + 1] / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/cressi_leonardo_parser.c

@@ -146,6 +146,7 @@ cressi_leonardo_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, u
 			}
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = 0.0;
 			gasmix->oxygen = data[0x19] / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/deepblu_cosmiq_parser.c

@@ -151,6 +151,7 @@ deepblu_cosmiq_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, un
 			*((unsigned int *) value) = mode == SCUBA;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->oxygen = data[3] / 100.0;
 			gasmix->helium = 0.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/deepsix_excursion_parser.c

@@ -322,6 +322,7 @@ deepsix_excursion_parser_get_field (dc_parser_t *abstract, dc_field_type_t type,
 			*((unsigned int *) value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->oxygen   = parser->gasmix[flags].oxygen / 100.0;
 			gasmix->helium   = parser->gasmix[flags].helium / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/diverite_nitekq_parser.c

@@ -161,6 +161,7 @@ diverite_nitekq_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, u
 			*((unsigned int *) value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = parser->he[flags] / 100.0;
 			gasmix->oxygen = parser->o2[flags] / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/divesoft_freedom_parser.c

@@ -838,6 +838,13 @@ divesoft_freedom_parser_get_field (dc_parser_t *abstract, dc_field_type_t type,
 			*((unsigned int *) value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			if (parser->gasmix[flags].type == OXYGEN) {
+				gasmix->usage = DC_USAGE_OXYGEN;
+			} else if (parser->gasmix[flags].type == DILUENT) {
+				gasmix->usage = DC_USAGE_DILUENT;
+			} else {
+				gasmix->usage = DC_USAGE_NONE;
+			}
 			gasmix->helium = parser->gasmix[flags].helium / 100.0;
 			gasmix->oxygen = parser->gasmix[flags].oxygen / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;
@@ -859,6 +866,7 @@ divesoft_freedom_parser_get_field (dc_parser_t *abstract, dc_field_type_t type,
 			tank->beginpressure = parser->tank[flags].beginpressure * 2.0;
 			tank->endpressure   = parser->tank[flags].endpressure   * 2.0;
 			tank->gasmix = flags;
+			tank->usage = DC_USAGE_NONE;
 			break;
 		case DC_FIELD_DECOMODEL:
 			if (parser->vpm) {

src/divesystem_idive_parser.c

@@ -317,6 +317,7 @@ divesystem_idive_parser_get_field (dc_parser_t *abstract, dc_field_type_t type,
 			*((unsigned int *) value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = parser->gasmix[flags].helium / 100.0;
 			gasmix->oxygen = parser->gasmix[flags].oxygen / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;
@@ -331,6 +332,7 @@ divesystem_idive_parser_get_field (dc_parser_t *abstract, dc_field_type_t type,
 			tank->beginpressure = parser->tank[flags].beginpressure;
 			tank->endpressure   = parser->tank[flags].endpressure;
 			tank->gasmix = DC_GASMIX_UNKNOWN;
+			tank->usage = DC_USAGE_NONE;
 			break;
 		case DC_FIELD_ATMOSPHERIC:
 			if (ISIX3M(parser->model)) {

src/hw_ostc_parser.c

@@ -552,6 +552,8 @@ hw_ostc_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsigned
 			*((unsigned int *) value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = parser->gasmix[flags].diluent ?
+				DC_USAGE_DILUENT : DC_USAGE_NONE;
 			gasmix->oxygen = parser->gasmix[flags].oxygen / 100.0;
 			gasmix->helium = parser->gasmix[flags].helium / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/liquivision_lynx_parser.c

@@ -315,6 +315,7 @@ liquivision_lynx_parser_get_field (dc_parser_t *abstract, dc_field_type_t type,
 			*((unsigned int *) value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = parser->gasmix[flags].helium / 100.0;
 			gasmix->oxygen = parser->gasmix[flags].oxygen / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;
@@ -329,6 +330,7 @@ liquivision_lynx_parser_get_field (dc_parser_t *abstract, dc_field_type_t type,
 			tank->beginpressure = parser->tank[flags].beginpressure / 100.0;
 			tank->endpressure   = parser->tank[flags].endpressure / 100.0;
 			tank->gasmix = DC_GASMIX_UNKNOWN;
+			tank->usage = DC_USAGE_NONE;
 			break;
 		default:
 			return DC_STATUS_UNSUPPORTED;

src/mares_darwin_parser.c

@@ -159,6 +159,7 @@ mares_darwin_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsi
 			}
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = 0.0;
 			if (mode == NITROX) {
 				gasmix->oxygen = p[0x0E] / 100.0;
@@ -185,6 +186,7 @@ mares_darwin_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsi
 				tank->gasmix = 0;
 				tank->beginpressure = array_uint16_be (p + 0x17);
 				tank->endpressure = array_uint16_be (p + 0x19);
+				tank->usage = DC_USAGE_NONE;
 			} else {
 				return DC_STATUS_UNSUPPORTED;
 			}

src/mares_iconhd_parser.c

@@ -830,6 +830,7 @@ mares_iconhd_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsi
 			*((unsigned int *) value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->oxygen = parser->gasmix[flags].oxygen / 100.0;
 			gasmix->helium = parser->gasmix[flags].helium / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;
@@ -857,6 +858,7 @@ mares_iconhd_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsi
 			} else {
 				tank->gasmix = DC_GASMIX_UNKNOWN;
 			}
+			tank->usage = DC_USAGE_NONE;
 			break;
 		case DC_FIELD_ATMOSPHERIC:
 			*((double *) value) = array_uint16_le (p + parser->layout->atmospheric) / (1000.0 * parser->layout->atmospheric_divisor);

src/mares_nemo_parser.c

@@ -251,6 +251,7 @@ mares_nemo_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsign
 				}
 				gasmix->helium = 0.0;
 				gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;
+				gasmix->usage = DC_USAGE_NONE;
 				break;
 			case DC_FIELD_TANK_COUNT:
 				if (parser->extra)
@@ -290,6 +291,7 @@ mares_nemo_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsign
 				} else {
 					tank->gasmix = DC_GASMIX_UNKNOWN;
 				}
+				tank->usage = DC_USAGE_NONE;
 				break;
 			case DC_FIELD_TEMPERATURE_MINIMUM:
 				*((double *) value) = (signed char) p[53 - 11];

src/mclean_extreme_parser.c

@@ -221,6 +221,7 @@ mclean_extreme_parser_get_field(dc_parser_t *abstract, dc_field_type_t type, uns
 			*((unsigned int *)value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = 0.01 * abstract->data[0x0001 + 1 + 2 * parser->gasmix[flags]];
 			gasmix->oxygen = 0.01 * abstract->data[0x0001 + 0 + 2 * parser->gasmix[flags]];
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/oceanic_atom2_parser.c

@@ -516,6 +516,7 @@ oceanic_atom2_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, uns
 			*((unsigned int *) value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->oxygen = parser->oxygen[flags] / 100.0;
 			gasmix->helium = parser->helium[flags] / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/oceanic_veo250_parser.c

@@ -170,6 +170,7 @@ oceanic_veo250_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, un
 				*((unsigned int *) value) = 1;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = 0.0;
 			if (data[footer + 6])
 				gasmix->oxygen = data[footer + 6] / 100.0;

src/oceanic_vtpro_parser.c

@@ -200,6 +200,7 @@ oceanic_vtpro_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, uns
 			*((unsigned int *) value) = 1;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = 0.0;
 			if (oxygen)
 				gasmix->oxygen = oxygen / 100.0;
@@ -220,6 +221,7 @@ oceanic_vtpro_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, uns
 			tank->gasmix = flags;
 			tank->beginpressure = beginpressure * 2 * PSI / BAR;
 			tank->endpressure = endpressure * 2 * PSI / BAR;
+			tank->usage = DC_USAGE_NONE;
 			break;
 		default:
 			return DC_STATUS_UNSUPPORTED;

src/oceans_s1_parser.c

@@ -166,6 +166,7 @@ oceans_s1_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsigne
 			*((unsigned int *) value) = parser->divemode == SCUBA;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = 0.0;
 			gasmix->oxygen = parser->oxygen / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/seac_screen_parser.c

@@ -239,6 +239,7 @@ seac_screen_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsig
 			*((unsigned int *)value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = 0.0;
 			gasmix->oxygen = parser->oxygen[flags] / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/shearwater_predator_parser.c

@@ -774,6 +774,7 @@ shearwater_predator_parser_get_field (dc_parser_t *abstract, dc_field_type_t typ
 			*((unsigned int *) value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = parser->gasmix[flags].diluent ? DC_USAGE_DILUENT : DC_USAGE_NONE;
 			gasmix->oxygen = parser->gasmix[flags].oxygen / 100.0;
 			gasmix->helium = parser->gasmix[flags].helium / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;
@@ -788,6 +789,22 @@ shearwater_predator_parser_get_field (dc_parser_t *abstract, dc_field_type_t typ
 			tank->beginpressure = parser->tank[flags].beginpressure * 2 * PSI / BAR;
 			tank->endpressure   = parser->tank[flags].endpressure   * 2 * PSI / BAR;
 			tank->gasmix = DC_GASMIX_UNKNOWN;
+			switch (parser->tank[flags].name[0]) {
+			case 'S':
+				tank->usage = DC_USAGE_SIDEMOUNT;
+				break;
+			case 'O':
+				tank->usage = DC_USAGE_OXYGEN;
+				break;
+			case 'D':
+				tank->usage = DC_USAGE_DILUENT;
+				break;
+			case 'T':
+			case 'B':
+			default:
+				tank->usage = DC_USAGE_NONE;
+				break;
+			}
 			break;
 		case DC_FIELD_SALINITY:
 			if (parser->density == 1000)

src/suunto_d9_parser.c

@@ -388,6 +388,7 @@ suunto_d9_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsigne
 			*((unsigned int *) value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = parser->helium[flags] / 100.0;
 			gasmix->oxygen = parser->oxygen[flags] / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/suunto_eon_parser.c

@@ -225,6 +225,7 @@ suunto_eon_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsign
 			*((unsigned int *) value) = 1;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = 0.0;
 			gasmix->oxygen = oxygen / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;
@@ -242,6 +243,7 @@ suunto_eon_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsign
 			tank->gasmix = 0;
 			tank->beginpressure = beginpressure;
 			tank->endpressure = endpressure;
+			tank->usage = DC_USAGE_NONE;
 			break;
 		case DC_FIELD_TEMPERATURE_MINIMUM:
 			if (parser->spyder)

src/suunto_eonsteel_parser.c

@@ -88,6 +88,7 @@ typedef struct suunto_eonsteel_parser_t {
 		double highsetpoint;
 		double customsetpoint;
 		dc_tankvolume_t tankinfo[MAXGASES];
+		dc_usage_t tankusage[MAXGASES];
 		double tanksize[MAXGASES];
 		double tankworkingpressure[MAXGASES];
 		dc_decomodel_t decomodel;
@@ -1097,6 +1098,7 @@ suunto_eonsteel_parser_get_field(dc_parser_t *parser, dc_field_type_t type, unsi
 			if (fabs(tank->volume - rint(tank->volume)) > 0.001)
 				tank->type = DC_TANKVOLUME_IMPERIAL;
 		}
+		tank->usage = eon->cache.tankusage[flags];
 		break;
 	case DC_FIELD_DECOMODEL:
 		field_value(value, eon->cache.decomodel);
@@ -1160,6 +1162,7 @@ static int add_gas_type(suunto_eonsteel_parser_t *eon, const struct type_desc *d
 {
 	int idx = eon->cache.ngases;
 	dc_tankvolume_t tankinfo = DC_TANKVOLUME_METRIC;
+	dc_usage_t usage = DC_USAGE_NONE;
 	char *name;
 
 	if (idx >= MAXGASES)
@@ -1170,15 +1173,17 @@ static int add_gas_type(suunto_eonsteel_parser_t *eon, const struct type_desc *d
 	if (!name)
 		DEBUG(eon->base.context, "Unable to look up gas type %u in %s", type, desc->format);
 	else if (!strcasecmp(name, "Diluent"))
-		;
+		usage = DC_USAGE_DILUENT;
 	else if (!strcasecmp(name, "Oxygen"))
-		;
+		usage = DC_USAGE_OXYGEN;
 	else if (!strcasecmp(name, "None"))
 		tankinfo = DC_TANKVOLUME_NONE;
 	else if (strcasecmp(name, "Primary"))
 		DEBUG(eon->base.context, "Unknown gas type %u (%s)", type, name);
 
 	eon->cache.tankinfo[idx] = tankinfo;
+	eon->cache.tankusage[idx] = usage;
+	eon->cache.gasmix[idx].usage = usage;
 
 	eon->cache.initialized |= 1 << DC_FIELD_GASMIX_COUNT;
 	eon->cache.initialized |= 1 << DC_FIELD_TANK_COUNT;

src/suunto_solution_parser.c

@@ -151,6 +151,7 @@ suunto_solution_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, u
 			*((unsigned int *) value) = 1;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = 0.0;
 			gasmix->oxygen = 0.21;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;

src/suunto_vyper_parser.c

@@ -267,6 +267,7 @@ suunto_vyper_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsi
 				*((unsigned int *) value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gas->usage = DC_USAGE_NONE;
 			gas->helium = 0.0;
 			gas->oxygen = parser->oxygen[flags] / 100.0;
 			gas->nitrogen = 1.0 - gas->oxygen - gas->helium;
@@ -287,6 +288,7 @@ suunto_vyper_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsi
 				tank->gasmix = 0;
 			tank->beginpressure = beginpressure;
 			tank->endpressure = endpressure;
+			tank->usage = DC_USAGE_NONE;
 			break;
 		case DC_FIELD_TEMPERATURE_SURFACE:
 			*((double *) value) = (signed char) data[8];

src/uwatec_memomouse_parser.c

@@ -166,6 +166,7 @@ uwatec_memomouse_parser_get_field (dc_parser_t *abstract, dc_field_type_t type,
 			*((unsigned int *) value) = 1;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = 0.0;
 			if (size >= header + 18) {
 				if (is_oxygen)
@@ -197,6 +198,7 @@ uwatec_memomouse_parser_get_field (dc_parser_t *abstract, dc_field_type_t type,
 			}
 			tank->endpressure = 0.0;
 			tank->gasmix = 0;
+			tank->usage = DC_USAGE_NONE;
 			break;
 		case DC_FIELD_TEMPERATURE_MINIMUM:
 			*((double *) value) = (signed char) data[15] / 4.0;

src/uwatec_smart_parser.c

@@ -807,6 +807,7 @@ uwatec_smart_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsi
 			*((unsigned int *) value) = parser->ngasmixes;
 			break;
 		case DC_FIELD_GASMIX:
+			gasmix->usage = DC_USAGE_NONE;
 			gasmix->helium = parser->gasmix[flags].helium / 100.0;
 			gasmix->oxygen = parser->gasmix[flags].oxygen / 100.0;
 			gasmix->nitrogen = 1.0 - gasmix->oxygen - gasmix->helium;
@@ -821,6 +822,7 @@ uwatec_smart_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, unsi
 			tank->beginpressure = parser->tank[flags].beginpressure / 128.0;
 			tank->endpressure   = parser->tank[flags].endpressure   / 128.0;
 			tank->gasmix = parser->tank[flags].gasmix;
+			tank->usage = DC_USAGE_NONE;
 			break;
 		case DC_FIELD_TEMPERATURE_MINIMUM:
 			*((double *) value) = (signed short) array_uint16_le (data + table->temp_minimum) / 10.0;