Planner: Fix Warning from Coverity.

Fix an interger overflow warning when parsing setpoints.

@bstoeger: In the end it turned out that this parser was only used in
one place in the planner UI, and it was simplest to switch this to
using `QVariant.toFloat()` in the model itself, which is consistent how
the rest of the input values is parsed and validated.

Signed-off-by: Michael Keller <github@ike.ch>

core/planner.cpp

@@ -1102,131 +1102,3 @@ bool plan(struct deco_state *ds, struct diveplan *diveplan, struct dive *dive, i
 
 	return decodive;
 }
-
-/*
- * Get a value with a given number of decimals:
- * - get_decimals("10.2", &"10.2", 1) == 102
- * - get_decimals("9", &"9", 1) = 90
- * - get_decimals("1.35", &"1.35", 2) == 135))
- *
- * Return negative for errors.
- */
-static int get_decimals(const char *begin, const char **endp, const unsigned decimals)
-{
-	char *end;
-	int value = strtol(begin, &end, 10);
-
-	if (begin == end)
-		return -1;
-
-	/* Fraction? We only look at the first digit */
-	if (*end == '.')
-		end++;
-
-	unsigned fraction = 0;
-	for (unsigned i = 0; i < decimals; i++) {
-		value *= 10;
-
-		unsigned digit = 0;
-		if (isdigit(*end)) {
-			digit = *end - '0';
-
-			end++;
-		} else if (*end != '\0') {
-			return -1;
-		}
-
-		fraction = 10 * fraction + digit;
-
-	}
-	value += fraction;
-
-	do {
-		end++;
-	} while (isdigit(*end));
-
-	*endp = end;
-	return value;
-}
-
-static int get_permille(const char *begin, const char **end)
-{
-	int value = get_decimals(begin, end, 1);
-	if (value >= 0) {
-		/* Allow a percentage sign */
-		if (**end == '%')
-			++*end;
-	}
-	return value;
-}
-
-int validate_gas(const char *text, struct gasmix *gas)
-{
-	int o2, he;
-
-	if (!text)
-		return 0;
-
-	while (isspace(*text))
-		text++;
-
-	if (!*text)
-		return 0;
-
-	if (!strcasecmp(text, translate("gettextFromC", "air"))) {
-		o2 = O2_IN_AIR;
-		he = 0;
-		text += strlen(translate("gettextFromC", "air"));
-	} else if (!strcasecmp(text, translate("gettextFromC", "oxygen"))) {
-		o2 = 1000;
-		he = 0;
-		text += strlen(translate("gettextFromC", "oxygen"));
-	} else if (!strncasecmp(text, translate("gettextFromC", "ean"), 3)) {
-		o2 = get_permille(text + 3, &text);
-		he = 0;
-	} else {
-		o2 = get_permille(text, &text);
-		he = 0;
-		if (*text == '/')
-			he = get_permille(text + 1, &text);
-	}
-
-	/* We don't want any extra crud */
-	while (isspace(*text))
-		text++;
-	if (*text)
-		return 0;
-
-	/* Validate the gas mix */
-	if (*text || o2 < 1 || o2 > 1000 || he < 0 || o2 + he > 1000)
-		return 0;
-
-	/* Let it rip */
-	gas->o2.permille = o2;
-	gas->he.permille = he;
-	return 1;
-}
-
-int validate_po2(const char *text, int *mbar_po2)
-{
-	int po2;
-
-	if (!text)
-		return 0;
-
-	po2 = get_decimals(text, &text, 2);
-	if (po2 < 0)
-		return 0;
-
-	while (isspace(*text))
-		text++;
-	if (*text)
-		return 0;
-
-	*mbar_po2 = po2 * 10;
-
-	if (*mbar_po2 < 160)
-		*mbar_po2 = 160;
-
-	return 1;
-}

core/planner.h

@@ -40,8 +40,6 @@ typedef enum {
 	PLAN_ERROR_INAPPROPRIATE_GAS,
 } planner_error_t;
 
-extern int validate_gas(const char *text, struct gasmix *gas);
-extern int validate_po2(const char *text, int *mbar_po2);
 extern int get_cylinderid_at_time(struct dive *dive, struct divecomputer *dc, duration_t time);
 extern bool diveplan_empty(struct diveplan *diveplan);
 extern void add_plan_to_notes(struct diveplan *diveplan, struct dive *dive, bool show_disclaimer, planner_error_t error);

qt-models/diveplannermodel.cpp

@@ -357,13 +357,15 @@ bool DivePlannerPointsModel::setData(const QModelIndex &index, const QVariant &v
 	if (role == Qt::EditRole) {
 		divedatapoint &p = divepoints[index.row()];
 		switch (index.column()) {
-		case DEPTH:
+		case DEPTH: {
-			if (value.toInt() >= 0) {
+			int depth = value.toInt();
-				p.depth = units_to_depth(value.toInt());
+			if (depth >= 0) {
+				p.depth = units_to_depth(depth);
 				if (updateMaxDepth())
 					cylinders.updateBestMixes();
 			}
 			break;
+		}
 		case RUNTIME: {
 			int secs = value.toInt() * 60;
 			i = index.row();
@@ -381,7 +383,7 @@ bool DivePlannerPointsModel::setData(const QModelIndex &index, const QVariant &v
 		}
 		case DURATION: {
 			int secs = value.toInt() * 60;
-				if (!secs)
+			if (secs < 0)
 				secs = 10;
 			i = index.row();
 			if (i)
@@ -393,10 +395,12 @@ bool DivePlannerPointsModel::setData(const QModelIndex &index, const QVariant &v
 			break;
 		}
 		case CCSETPOINT: {
-			int po2 = 0;
+			bool ok;
-			QByteArray gasv = value.toByteArray();
+			int po2 = round(value.toFloat(&ok) * 100) * 10;
-			if (validate_po2(gasv.data(), &po2))
+
-				p.setpoint = po2;
+			if (ok)
+				p.setpoint = std::max(po2, 160);
+
 			break;
 		}
 		case GAS: