COMMON: Add methods to U32String to match String

common/ustr.cpp

@@ -232,6 +232,30 @@ void U32String::deleteChar(uint32 p) {
 	_size--;
 }
 
+void U32String::deleteLastChar() {
+	if (_size > 0)
+		deleteChar(_size - 1);
+}
+
+void U32String::erase(uint32 p, uint32 len) {
+	assert(p < _size);
+
+	makeUnique();
+	// If len == npos or p + len is over the end, remove all the way to the end
+	if (len == npos || p + len >= _size) {
+		// Delete char at p as well. So _size = (p - 1) + 1
+		_size = p;
+		// Null terminate
+		_str[_size] = 0;
+		return;
+	}
+
+	for ( ; p + len <= _size; p++) {
+		_str[p] = _str[p + len];
+	}
+	_size -= len;
+}
+
 void U32String::clear() {
 	decRefCount(_extern._refCount);
 

common/ustr.h

@@ -162,6 +162,12 @@ public:
 	 */
 	void deleteChar(uint32 p);
 
+	/** Remove the last character from the string. */
+	void deleteLastChar();
+
+	/** Remove all characters from position p to the p + len. If len = String::npos, removes all characters to the end */
+	void erase(uint32 p, uint32 len = npos);
+
 	/** Clears the string, making it empty. */
 	void clear();