fix for not properly handling nested brackets in

string replacement, e.g. [[FOO]]

indra/llcommon/llstring.cpp

@@ -936,13 +936,18 @@ LLStringUtil::size_type LLStringUtil::getSubstitution(const std::string& instr,
 {
 	const std::string delims (",");
 	
-	// Find the first ]
-	size_type pos2 = instr.find(']', start);
+	// Find the first [
+	size_type pos1 = instr.find('[', start);
+	if (pos1 == std::string::npos)
+		return std::string::npos;
+
+	//Find the first ] after the initial [
+	size_type pos2 = instr.find(']', pos1);
 	if (pos2 == std::string::npos)
 		return std::string::npos;
 
-	// Find the last [ before ]
-	size_type pos1 = instr.find_last_of('[', pos2-1);
+	// Find the last [ before ] in case of nested [[]]
+	pos1 = instr.find_last_of('[', pos2-1);
 	if (pos1 == std::string::npos || pos1 < start)
 		return std::string::npos;
 	

indra/llcommon/tests/llstring_test.cpp

@@ -624,6 +624,14 @@ namespace tut
 		subcount = LLStringUtil::format(s, fmt_map);
 		ensure_equals("LLStringUtil::format: Assorted Test2 result", s, "?Am I not a long string?short[A]bbbaaaba[A]");
 		ensure_equals("LLStringUtil::format: Assorted Test2 result count", 9, subcount);
+		
+		// Test on nested brackets
+		std::string srcs6 = "[[TRICK1]][[A]]";
+		s = srcs6;
+		subcount = LLStringUtil::format(s, fmt_map);
+		ensure_equals("LLStringUtil::format: Assorted Test2 result", s, "[[A]][a]");
+		ensure_equals("LLStringUtil::format: Assorted Test2 result count", 2, subcount);
+
 
 		// Test an assorted substitution
 		std::string srcs8 = "foo[DELETE]bar?";