made all getWhat() methods on exceptions consistent. they now

all use format() the same way.  also changed format() to actually
do formatting.  however, it doesn't try looking up formatting
strings by id, it just uses the fallback format string.

base/XBase.cpp

@@ -1,5 +1,6 @@
 #include "XBase.h"
 #include <cerrno>
+#include <cstdarg>
 
 // win32 wants a const char* argument to std::exception c'tor
 #if WINDOWS_LIKE
@@ -46,9 +47,22 @@ XBase::what() const
 CString
 XBase::format(const char* /*id*/, const char* fmt, ...) const throw()
 {
-	// FIXME -- use id to lookup formating string
-	// FIXME -- format string with arguments
-	return fmt;
+	// FIXME -- lookup message string using id as an index.  set
+	// fmt to that string if it exists.
+
+	// format
+	CString result;
+	va_list args;
+	va_start(args, fmt);
+	try {
+		result = CStringUtil::vformat(fmt, args);
+	}
+	catch (...) {
+		// ignore
+	}
+	va_end(args);
+
+	return result;
 }