Function AddInt32ToValue

pg_documentdb_core/src/io/pgbson_utils.c:765–808

* Adds an Int32 to the current value. If the current value is an int64/double * applies the sum as an int64/double. If the value overflows, applies * the sum as an int64 * @overflowedFromInt64: Used for AddInt64ToValue(); Set if overflow from Int64 occurs, unset otherwise. */

 * @overflowedFromInt64: Used for AddInt64ToValue(); Set if overflow from Int64 occurs, unset otherwise.
 */
static void
AddInt32ToValue(bson_value_t *current, int32_t value, bool *overflowedFromInt64)
{
	if (current->value_type == BSON_TYPE_DOUBLE)
	{
		/* current value is already double - just do double add. */
		AddDoubleToValue(current, (double) value);
		return;
	}
	else if (current->value_type == BSON_TYPE_INT64)
	{
		/* current value is int64 - push to int64 handling and let it do */
		/* overflow checks. */
		AddInt64ToValue(current, (int64_t) value, overflowedFromInt64);
		return;
	}
	else if (current->value_type == BSON_TYPE_DECIMAL128)
	{
		bson_value_t valueToAdd;
		valueToAdd.value.v_int32 = value;
		valueToAdd.value_type = BSON_TYPE_INT32;

		valueToAdd.value.v_decimal128 = GetBsonValueAsDecimal128Quantized(&valueToAdd);
		valueToAdd.value_type = BSON_TYPE_DECIMAL128;
		AddDecimal128Numbers(current, &valueToAdd, current);
		return;
	}

	/* current sum is int32. */
	int64_t currentValue = BsonValueAsInt64(current);
	currentValue += value;

	/* Handle overflow. */
	if (currentValue > INT32_MAX || currentValue < INT32_MIN)
	{
		current->value.v_int64 = currentValue;
		current->value_type = BSON_TYPE_INT64;
	}
	else
	{
		current->value.v_int32 = (int32_t) currentValue;
		current->value_type = BSON_TYPE_INT32;
	}
}


/*