SCI: Added pointer arithmetic support for SCI2 strings

svn-id: r54365

1 files changed, 24 insertions, 0 deletions

diff --git a/engines/sci/engine/vm.cpp b/engines/sci/engine/vm.cpp
index 94fa016790..80500f74d1 100644
--- a/engines/sci/engine/vm.cpp
+++ b/engines/sci/engine/vm.cpp
@@ -641,6 +641,30 @@ static reg_t pointer_add(EngineState *s, reg_t base, int offset) {
 		base.offset += offset;
 		return base;
 
+	case SEG_TYPE_STRING: {
+		// We need to copy over the string into a new one
+		// Make sure that the offset is positive
+		if (offset < 0)
+			error("pointer_add: Attempt to reference a previous offset of a SCI string");
+
+		// Get the source string...
+		SciString *str = s->_segMan->lookupString(base);
+		Common::String rawStr = str->toString();
+
+		// ...and copy it to a new one
+		reg_t newStringAddr;
+		SciString *newStr = s->_segMan->allocateString(&newStringAddr);
+		newStr->setSize(str->getSize() - offset);
+
+		// Cut off characters till we reach the desired location
+		for (int i = 0; i < offset; i++)
+			rawStr.deleteChar(0);
+
+		newStr->fromString(rawStr);
+
+		return newStringAddr;
+	}
+
 	default:
 		// FIXME: Changed this to warning, because iceman does this during dancing with girl.
 		// Investigate why that is so and either fix the underlying issue or implement a more